NL2026666B1 - Photovoltaic string feed-through unit and associated method - Google Patents

Photovoltaic string feed-through unit and associated method Download PDF

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Publication number
NL2026666B1
NL2026666B1 NL2026666A NL2026666A NL2026666B1 NL 2026666 B1 NL2026666 B1 NL 2026666B1 NL 2026666 A NL2026666 A NL 2026666A NL 2026666 A NL2026666 A NL 2026666A NL 2026666 B1 NL2026666 B1 NL 2026666B1
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NL
Netherlands
Prior art keywords
pipe
holes
cover
outer cover
wire
Prior art date
Application number
NL2026666A
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Dutch (nl)
Inventor
Kremer Pieter
Original Assignee
Conduct Technical Solutions B V
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Publication date
Application filed by Conduct Technical Solutions B V filed Critical Conduct Technical Solutions B V
Priority to NL2026666A priority Critical patent/NL2026666B1/en
Priority to PCT/NL2021/050619 priority patent/WO2022081007A1/en
Application granted granted Critical
Publication of NL2026666B1 publication Critical patent/NL2026666B1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/22—Installations of cables or lines through walls, floors or ceilings, e.g. into buildings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
    • H02G3/0462—Tubings, i.e. having a closed section
    • H02G3/0481—Tubings, i.e. having a closed section with a circular cross-section

Abstract

Photovoltaic (PV) string feed-through unit for feeding at least one PV string through a constructional element, said string comprising at least a positive wire and a negative wire, said PV string feed-through unit comprising a first pipe configured to receive the positive wire of the string, a second pipe configured to receive the negative wire of the string, an inner cover, configured to receive and enclose a first end of the first pipe and a first end of the second pipe, and provided with at least two through-holes for fittingly receiving the first ends of the first and the second pipes, wherein the inner cover is provided with at least two output cable holes, an outer cover, configured to receive and enclose a second end of the first pipe and a second end of the second pipe, and provided with at least two through-holes for fittingly receiving the second ends of the first and the second pipes, wherein the outer cover is provided with at least two input cable holes, and wherein the input cable holes are each provided with sealing means for water- and/or airtight feed-through of one of the negative wire and the positive wire.

Description

PHOTOVOLTAIC STRING FEED-THROUGH UNIT AND ASSOCIATED METHOD The present invention relates to a photovoltaic (PV) string feed-through unit for feeding at least one PV string through a constructional element, said string comprising at least a positive wire and anegative wire, and preferably a grounding wire. A second aspect of the invention relates to a method of feeding at least one PV string through a constructional element, said string comprising at least a positive wire and a negative wire, and preferably a grounding wire.
In view of the growing need for sustainable energy, a growing number of residential and small commercial buildings are being equipped with electricity generating structures, such as solar panels, and in particular photovoltaic (PV) solar panels. These PV panels convert light into electricity, e.g. by means of semiconducting materials, which are subsequently provided to the building for use as electrical power. This electrical power is for instance stored in batteries, directly used by electrical power consuming apparatuses in said building, and/or supplied to the general power grid. Many of these electricity generating structures are placed on existing buildings, in particular on roofs or other constructional elements thereof. The power delivery cables of these structures, generally called strings, or photovoltaic strings, are fed from the electricity generating structures, through said roof or constructional element, to a power unit of the building. Such power unit usually comprises an inverter which is configured to convert the direct current (DC) power of the structure to an alternating current (AC) power which is used by general power grids, and therefore also building appliances and the like. A photovoltaic string may also be referred to as a solar panel string. A string may also be referred to as wiring, power cabling, or the like. Multiple electricity generating structures, such as solar panels, may share a single string.
One disadvantage, amongst others, of equipping an existing building, i.e. existing constructional element, with a solar panel, is that feeding the wiring, i.e. the string(s), of the solar panels through the constructional element requires a relatively large amount of labor. Namely, this generally entails drilling holes, feeding the wiring therethrough, water- and/or airproofing the holes, and so forth. At the same time, it must be ensured that the negative and positive wires are unable to touch each other. Especially when damaged these wires become damaged, which may lead to short circuits, which in turn may result in fire and other potentially dangerous situations. Accordingly, multiple strings from multiple solar panels or solar panel groups require several entry points through the constructional element, wherein the positive and negative wires must be separated as well. Hence, numerous entry points need to be drilled, water- and/or airproofed and the like. This results in a lower structural integrity of the constructional element, as well as a generous amount of labor for the personnel installing the electricity generating structure.
It is an object of the invention, amongst other objects, to mitigate the aforementioned disadvantage of the prior art.
According to a first aspect of the invention, a photovoltaic (PV) string feed-through unit is provided for feeding at least one PV string through a constructional element, said string comprising at least a positive wire and a negative wire, said PV string feed-through unit comprising a first pipe configured to receive the positive wire of the string, and configured to be fed through said constructional element, a second pipe configured to receive the negative wire of the string, and configured to be fed through said constructional element, an inner cover, configured to abut an inner side of the constructional element, and to receive and enclose a first end of the first pipe and a first end of the second pipe, and provided with at least two through-holes for fittingly receiving the first ends of the first pipe and the second pipe, wherein the inner cover is provided with at least two output cable holes, each configured to receive one of the negative wire and the positive wire therethrough, an outer cover, configured to abut an outer side of the constructional element, and to receive and enclose a second end of the first pipe and a second end of the second pipe, and provided with at least two through-holes for fittingly receiving the second ends of the first pipe and the second pipe, wherein the outer cover is provided with at least two input cable holes, each configured to receive one of the negative wire and the positive wire therethrough, and wherein the input cable holes are each provided with sealing means for water- and/or airtight feed- through of one of the negative wire and the positive wire.
The PV string feed-through unit according to the above is capable of safely, reliably, and sustainably feed one or more PV strings through a constructional element, such as a roofing element of a building. As the feed-through unit comprises at least two pipes, the positive and negative wires of the strings can be fed through the constructional element separately, mitigating short circuit possibilities upon damaging of any of the wires. However, only a single unit is required to do so. Further, the pipes of the unit are enclosed by the covers, such that the wires running through the unit, and therewith through the constructional element, are shielded from the environment, such as from moisture and air. In addition to shielding the wires, this ensures that water does not leak from the outside of the constructional element to the inside of the constructional element, mitigating possible water damage through leakage. Furthermore, besides forming a safe routing of the wires through the constructional element, the unit allows for quick and easy installment. In particular, the unit can be installed through a single or a few mounting hole(s), thus requiring only drilling equipment to install in an existing constructional element. Alternatively, for new buildings to be constructed, the mounting hole can be pre-configured in a constructional element for such new building. The sealing means ensure that no moisture (and preferably no air) enters the unit through the entry points of the wires of the string. Hence, by providing the above feed-through unit, a safe, reliable, and durable way of feeding strings through a constructional element is provided, which can be installed with minimal required labor.
In a further example of the PV string feed-through unit, the inner cover comprises an inner base plate, configured to abut the inner side of the constructional element, and provided with the at least two through-holes of the inner cover, and an inner cap configured to be mounted to the inner base plate, wherein the inner cap is provided with said output cables holes. Alternatively or additionally, itis preferred that the outer cover comprises an outer base plate, configured to abut the outer side of the constructional element, and provided with the at least two through-holes of the outer cover, and an outer cap configured to be mounted to the outer base plate, wherein the outer cap is provided with said input cable holes.
By providing an inner and/or outer cover each with (at least) two parts that can be mounted together, the installation of the unit is eased even further. Accordingly, first and second pipes can be fed through the through-holes of the inner and/or outer base plate, which in turn can be fastened or placed against the inner and/or outer sides of the constructional element. After fixation of the inner and/or outer base plate and the first and second pipes, the passage for the wires (i.e. through the pipes) can be inspected before they are shielded off by the respective inner and/or outer caps. Accordingly, it is easily determined whether the passage for the wires through the unit is clear (i.e. accessible by the wires) and whether the installation has therefore been performed successfully. The inner and/or outer base plates may for instance be fastened to the constructional element, e.g. by means of fastening means, such as screws. The inner and/or outer caps may for instance be mountable to the inner and/or outer base plates by means of a snapping connection, which preferably provides a water- and/or airproof (preferably water- and/or airtight) environment within the inner and/or outer cover. In turn, as the open ends of the pipes terminate inside the cover, the interior of the pipes is protected from environmental conditions, such as water and air. The inner base plate and inner cap, and/or the outer base plate and outer cap may be provided with a sealing member, such as an elastic O-ring, therebetween.
In a further example of the PV string feed-through unit, the outer cover is configured to enclose the second ends of the first and second pipes in a substantially water- and/or airtight manner. Additionally or alternatively, the inner cover is configured to enclose the first ends of the first and second pipes in a substantially water- and/or airtight manner.
As mentioned above, its is preferred that the inner and/or outer covers provide an water- and/or airtight environment in their interior. Accordingly, the wires running through the covers and the pipes are protected against water and/or air, which mitigates the risks of corrosion and/or short circuits. As the open ends (at the first and second ends) of the pipes terminate inside the cover, the interior of the pipes is protected from environmental conditions, such as water and air. If the outer side of the constructional element is located on the exterior of the building, at least an outer cover enclosing the second ends of the first and second pipes in a substantially water- and/or airtight manner ensures that the feed-through of the string, with its negative and positive wire(s), is shielded from the environment, i.e. from rain, wind, humidity, and the like.
In a further example of the PV string feed-through unit, the output cable holes of the inner cover are provided with sealing means for water- and/or airtight feed-through of the negative wire and the positive wire.
When both the input cables holes and the output cable holes are provided with sealing means, the interior of the unit forms a substantially water and/or airtight environment. Accordingly, damage of the wires running through the mounting hole in the constructional element — which is not easily reachable for maintenance — is effectively mitigated.
Ina farther example of the PV string feed-through unit, the sealing means comprise a cable gland. A cable gland, also known as cord grip, cable strain relief, cable connector or cable fitting, is capable of feeding a wire (or at least its electrical signal) through a barrier, such as the outer/inner cover. The cable gland is preferably water- and/or airproofed, such that environmental factors, such as moisture, do not damage the gland, the wire, and/or the electrical connection. Any suitable type of gland may be utilized which can effectively pass a positive or negative wire of a photovoltaic string, or at least its electrical signal. Further, cable glands provide strain-relief for the wires.
In a further example of the PV string feed-through unit, the at least two through-holes of the inner cover are provided with internal screw thread, and the first pipe and the second pipe are each provided, along at least part of their length, with external screw thread adjacent to their first ends, such that the first pipe and the second pipe can be mounted to the inner base plate by means of screwing. Alternatively, the at least two through-holes of the outer cover are provided with internal screw thread, and the first pipe and the second pipe are each provided, along at least part of their length, with external screw thread adjacent to their second ends, such that the first pipe and the second pipe can be mounted to the outer cover by means of screwing. Naturally, it is possible to provide the through-holes of both the inner and outer cover with opposing internal screw thread,
such that the pipes can be simultaneously screwed to the covers, provided that the pipes are provided with external screw thread adjacent their first and second ends.
By providing internal screw thread in the through-holes and external screw thread on the pipes, the 5 pipes are easily and fittingly mountable to the inner and/or outer cover, or at least their respective base plates if applicable. It is preferred to provide the internal screw thread to the through-holes of only one of the inner cover and outer cover, as screwing the pipes to both the inner and outer cover may be difficult in practice with the constructional element therebetween.
Ina farther example of the PV string feed-through unit, the inner cover comprises fastening means configured to enable fastening of the feed-through unit to the inner side of the constructional element. Preferably, the inner cover comprises the inner base plate, and the inner base plate is provided with fastening means, wherein the fastening means are preferably through holes configured to receive a screw or bolt therethrough. The inner cover, preferably the inner base plate thereof, may therefore easily be fastened to the inner side of the constructional element, In particular, in the case that the through-holes of the inner cover, and more preferably the inner base plate, comprise internal screw thread, the pipes can be screwed to the inner cover, after which the inner cover can be fastened to the constructional element. Accordingly, the entire PV string feed- through unit is fixated relative to the constructional element when the inner cover is fixed to the constractional element, the pipes are in turn fixed to the inner cover, and the outer cover is in turn fixed to the pipes.
In a further example of the PV string feed-through unit, the first pipe and the second pipe are each provided, along at least part of their length, with external screw thread adjacent to their second ends, said external screw thread being configured to receive a fastening means, in particular a nut, so as to be able to tighten the outer cover to the outer side of the constructional element. Accordingly, when the pipes are fed through the outer cover, and more preferably the outer base plate, a nut or a similar fastening means may be screwed onto the second ends of the pipes until the outer cover, preferably the outer base plate, is clamped between the fastening means and the outer side of the constructional element.
In a further example of the PV string feed-through unit, the inner cover and/or the outer cover comprise centering tabs protruding outwardly therefrom, said centering tabs being spaced apart, at a fitting distance, from each other such that the feed-through unit may be centered in a mounting hole through the constructional element, which mounting hole preferably has an inner diameter substantially corresponding to the fitting distance. In particular, when the inner cover and/or the outer cover comprise an inner base plate and/or an outer base plate, the centering tabs protrude outwardly from the inner and/or outer base plate.
Preferably, the centering tabs are provided near an outer circumference of the inner and/or outer base plates.
Preferably, the inner and/or outer base plate has a substantially circular circumference.
Preferably, the inner and/or outer base plates are each provided with at least two centering tabs, and preferably at least four centering tabs.
The centering tabs are particularly helpful when the feed-through unit is provided in a single mounting hole of the constructional element, as it allows the entire unit to be centered in the single mounting hole.
The centering tabs may be configured to be snapped off, i.e. broken off, in case the user wishes to provide, for instance, two mounting holes (e.g. one for each pipe), as in centering by means of centering tabs is not necessary in this case.
In a further example of the PV string feed-through unit, said string further comprises a grounding wire, and the inner cover and the outer cover respectively comprise a further output cable hole and a further input cable hole configured to receive the grounding wire therethrough.
Such grounding
{5 wire may be a shared grounding wire, which constitutes a single grounding wire for multiple PV strings.
For instance, two PV strings, each having a positive wire and a negative wire, may share a single grounding wire.
In a further example of the PV string feed-through unit, said at least one string comprises two strings having two positive wires, two negative wires, and one grounding wire, and the inner cover and the outer cover respectively comprise five output cable holes and five input cable holes, each configured to receive one of the two positive wires, the two negative wires, and the one grounding wire therethrough.
In this preferred example, a PV string feed-through unit is suitable for two PV strings, which is generally the amount of strings expected to be used on a residential or small commercial building, which has been provided with electricity generating structures, and in particular photovoltaic solar panels.
In a further example of the PV string feed-through unit, the outer cover, inner cover, and pipes are manufactured of a plastic.
Preferably, the outer cover, inner cover, and pipes are manufactured through casting, injection molding, and/or additive manufacturing.
Alternatively, one or more of the outer cover, inner cover, first pipe, and second pipe may be manufactured of a metal.
Preferably, said metal is a low-conductive metal.
When the outer cover, inner cover, or pipes are manufactured of a metal, they are preferably coated, on their interior, exterior, or both, with a non- conductive material.
The present invention also relates to the use of any of the foregoing PV string feed-through units for use in an electricity generating structure. In other words, the present invention also relates to a wiring feed-through unit for feeding at least a positive wire and a negative wire through a constructional element, in accordance with any of the foregoing PV string feed-through units.
The present invention also relates to a solar panel assembly comprising any of the foregoing PV string feed-through units. According to a second aspect of the invention, there is provided a method of feeding at least one photovoltaic (PV) string through a constructional element, said string comprising at least a positive wire and a negative wire, the method comprising the steps of: - providing at least one mounting hole through the constructional element, - feeding a first pipe and a second pipe through said at least one mounting hole, - fittingly mounting a first end of the first pipe and a first end of the second pipe in respective through-holes in an inner cover, wherein the inner cover is provided with at least two output cable holes, each output cable hole configured to receive one of the negative wire and the positive wire therethrough, - fastening the inner cover to an inner side of the constructional element, such that the inner cover abuts the inner side of the constructional element, - feeding a second end of the first pipe and a second end of the second pipe through respective through-holes of an outer cover, wherein the outer cover is provided with at least two input cable holes, each input cable hole configured to receive one of the negative wire and the positive wire therethrough, and wherein the input cable holes are each provided with sealing means for water- and/or airtight feed-through of the negative wire and the positive wire, - feeding the positive wire through an input cable hole of the outer cover, the first pipe, and an output cable hole of the inner cover, and - feeding the negative wire through another input cable hole of the outer cover, the second pipe, and another output cable hole of the inner cover.
The above method provides feed-through of a PV string through a constructional element, such as a roofing element, requiring a minimal amount of labor. The above method may relate to the installation of a PV string feed-through unit in accordance with any of the above examples. The present method requires minimal alteration to the constructional element, as it may be performed by providing a single mounting hole through the constructional element, e.g. by drilling or sawing or the like. The pipes are then fed through the at least one mounting hole, and are mounted to the inner cover. The inner cover may then be fastened, e.g. by screwing or clamping, to the inner side of the constructional element. This results in the pipes and inner cover being fixated with respect to the constructional element. Preferably thereafter, the outer cover is mounted to the pipes. Preferably finally, the wires of the at least one string may then be fed through the outer cover, pipes, and inner cover, wherein the positive and negative wires are fed through different pipes in order to mitigate the possibility of short circuits or the like. Furthermore, preferably the string(s) comprise a grounding wire, which may be fed through either of the first and second pipes. Accordingly, a safe and reliable method of feeding wiring, such as a PV string, through a constructional element, such as a roofing element, is provided, which requires minimal labor. Due to the relatively small amount of actions that need to be performed in the method, the required labor is minimal and the chance of erroneous installation is minimized. Naturally, the advantages of the first aspect of the invention apply to the method as well.
In a further example of the method, the step of feeding the second ends of the first pipe and the second pipe through respective through-holes of the outer cover comprises feeding the second ends through the through-holes until the outer cover abuts an outer side of the constructional element. Accordingly, when both the inner cover and the outer cover abut the constructional element, the covers provide a sealing effect on the mounting hole, such that the exterior of the pipes is also shielded from the environment, e.g. from ram, wind, and the like.
In a further example of the method, the inner cover comprises an inner base plate, configured to abut the inner side of the constructional element, and provided with the at least two through-holes of the inner cover, and an inner cap configured to be mounted to the inner base plate, wherein the inner cap is provided with said output cables holes. Alternatively or additionally, the outer cover comprises an outer base plate, configured to abut the outer side of the constructional element, and provided with the at least two through-holes of the outer cover, and an outer cap configured to be mounted to the outer base plate, wherein the outer cap is provided with said input cable holes.
By providing an inner and/or outer cover each with (at least) two parts that can be mounted together, the installation of the unit is eased even further. Accordingly, first and second pipes can be fed through the through-holes of the inner and/or outer base plate, which in turn can be fastened or placed against the inner and/or outer sides of the constructional element. After fixation of the inner and/or outer base plate and the first and second pipes, the passage for the wires (i.e. through the pipes) can be inspected before they are shielded off by the respective inner and/or outer caps. Accordingly, it is easily determined whether the passage for the wires through the unit is clear (i.e.
accessible by the wires) and whether the installation has therefore been performed successfully. The inner and/or outer base plates may for instance be fastened to the constructional element, e.g. by means of fastening means, such as screws. The inner and/or outer caps may for instance be mountable to the inner and/or outer base plates by means of a snapping connection, which preferably provides a water- and/or airproof (preferably water- and/or airtight) environment within the inner and/or outer cover. In turn, as the open ends of the pipes terminate inside the cover, the interior of the pipes is protected from environmental conditions, such as water and air. The inner base plate and inner cap, and/or the outer base plate and outer cap may be provided with a sealing member, such as an elastic O-ring, therebetween.
In a further example of the method, the step of providing at least one mounting hole comprises providing a first mounting hole for the first pipe. and a second mounting hole for the second pipe. Preferably, the first and second mounting holes through the constructional element are substantially parallel, such that the pipes can be fed through the mounting holes in a substantially parallel manner. Preferably, the first and second mounting holes are concentric with the through holes of the outer cover and inner cover. Preferably, the inner diameter of the first and second mounting holes substantially correspond, respectively, to the outer diameter of the first pipe and second pipe. However, if desired a clearance between the first and second mounting holes and, respectively, the first and second pipes may be provided.
In a further example of the method, the through-holes of the inner cover are provided with internal screw thread, and the first pipe and the second pipe are each provided, along at least part of their length, with external screw thread adjacent to their first ends, and the step of mounting the first ends of the first pipe and the second pipe in respective through-holes in the inner cover comprises screwing the first pipe and the second pipe into the through holes of the inner cover. Alternatively, the at least two through-holes of the outer cover are provided with internal screw thread, and the first pipe and the second pipe are each provided, along at least part of their length, with external screw thread adjacent to their second ends, such that the first pipe and the second pipe can be mounted to the outer cover by means of screwing. Naturally, it is possible to provide the through- holes of both the inner and outer cover with opposing internal screw thread, such that the pipes can be simultaneously screwed to the covers, provided that the pipes are provided with external screw thread adjacent their first and second ends. By providing internal screw thread in the through-holes and external screw thread on the pipes, the pipes are easily and fittingly mountable to the inner and/or outer cover, or at least their respective base plates if applicable. It is preferred to provide the internal screw thread to the through-holes of only one of the inner cover and outer cover, as screwing the pipes to both the inner and outer cover may be difficult in practice with the constructional element therebetween. In a further example of the method, if the first pipe and the second pipe are longer than the mounting hole through the constructional element, the method further comprises the step of shortening the first pipe and the second pipe such that the outer cover can enclose the second ends of the first pipe and the second pipe without contacting the second ends of first pipe and the second pipe. The shortening of the first pipe and the second pipe preferably comprises sawing, cutting, breaking, and/or snipping off a length of the first pipe and a length of the second pipe from the second ends thereof. Additionally, the first pipe and second pipe may each be provided, along at least part of their length, with external screw thread adjacent to their second ends, said external screw thread being configured to receive a fastening means, in particular a nut, so as to be able to tighten the outer cover to the outer side of the constructional element. The length along which the external screw thread is provided to the first and second pipe may be such that it accommodates various thicknesses of constructional elements, i.e. the external screw thread may be provided along a substantial part of the length of the first and second pipe. The excess external screw thread may then be removed by the above step of shortening the first and second pipes. Accordingly, the method (and similarly the above PV string feed-through unit) is suitable for numerous different constructional elements, such as roofing elements, with various thicknesses.
In a further example of the method, the step of shortening the first pipe and the second pipe is performed after the step of feeding the second ends of the first pipe and the second pipe through respective through-holes of the outer base plate. When the first and second pipes are fed through the through-holes of the outer base plate. they may — depending on their length — protrude outwardly from the outer base plate and outer side of the constructional element to such an extent that the outer cap cannot be place upon the outer base plate without being obstructed by the first and second pipes. The shortening would then take place before the outer cap is placed upon the outer base plate.
In a further example of the method, the output cable holes are provided with sealing means for water- and/or airtight feed-through of one of the negative wire and the positive wire. When both the input cables holes and the output cable holes are provided with sealing means, the interior of the unit forms a substantially water and/or airtight environment. Accordingly, damage of the wires running through the mounting hole in the constructional element — which is not easily reachable for maintenance — is effectively mitigated.
il In a further example of the method, the sealing means comprise a cable gland, the method further comprising the steps of: - feeding the positive wire through a cable gland of the outer cover, and the negative wire through another cable gland of the outer cover, and - feeding the positive wire through a cable gland of the inner cover, and the negative wire through another cable gland of the inner cover. A cable gland, also known as cord grip, cable strain relief, cable connector or cable fitting, is capable of feeding a wire (or at least its electrical signal) through a barrier, such as the outer/inner cover. The cable gland is preferably water- and/or airproofed, such that environmental factors, such as moisture, do not damage the gland, the wire, and/or the electrical connection. Any suitable type of gland may be utilized which can effectively pass a positive or negative wire of a photovoltaic string, or at least its electrical signal. Further, cable glands provide strain-relief for the wires.
The present invention will hereinafter be described with reference to the figures in the enclosed drawings, wherein: - Figure 1 shows a perspective view of a PV string feed-through unit; - Figure 2 shows a schematic side view of a PV string feed-through unit installed through a constructional element; and - Figure 3 shows an exploded view of a PV string feed-through unit. In Figure 1 a PV string feed-through unit 1, hereinafter also referred to as feed-through unit 1 or unit 1, is shown. The unit 1 comprises and outer cover 2 and an inner cover 3, which are both connected to a first pipe 4 and a second pipe 5. The unit 1 shown in Figure 1 is configured to feed five wires, i.e. cables, (not shown in Figure 1) therethrough. In particular a cable can be fed through one of the input cable holes 6 of the outer cover 2, subsequently through one of the first pipe 4 and second pipe 5, and finally through one of the output cable holes 7 of the inner cover 3. The input cable holes 6 and the output cable holes 7 are provided with cable glands 8, which provide substantially water- and/or airtight feed-through of the cables, or at least their electrical signal, therethrough. The feed-through of the cables through the feed-through unit 1 is further elucidated below, with reference to Figure 2. Still referring to Figure 1, the outer cover 2 comprises an outer base plate 20 and an outer cap 21. The outer cover 2 preferably provides a substantially water- and/or airtight interior when outer cap 21 is connected to the outer base plate 20. The outer base plate 20 and outer cap 21 may be connected to each other by means of a snapping connection, wherein the seal formed therebetween is achieved through a conical connection interface therebetween. Additionally or alternatively, a sealing ring, such as a rubber O-ring, may be provided between the outer cap 21 and the outer base plate 20 so as to form a seal therebetween. A second end 41 (see Figures 2 and 3) of the first pipe 4 anda second end 51 (see Figures 2 and 3) of the second pipe 5 terminate in the interior of the outer cover 2. Accordingly, cables may be fed through the cable glands 8 of the input cable holes 6, after which they are protected from the environment outside the outer cover 2 by the tight connection between the outer cap 21, outer base plate 20, and the second ends 41, 51 of the first and second pipes 4, 5.
The inner cover 3 comprises an inner base plate 30 and an inner cap 31. The inner cover 3 preferably provides a substantially water- and/or airtight interior when inner cap 31 is connected to the inner base plate 30. The inner base plate 30 and inner cap 31 may be connected to each other by means of a snapping connection, wherein the seal formed therebetween is achieved through a conical connection interface therebetween. Additionally or alternatively, a sealing ring, such as a rubber O-ring, may be provided between the inner cap 31 and the inner base plate 30 so as to form a seal therebetween. A first end 40 (see Figure 3) of the first pipe 4 and a first end 50 (see Figure 3) of the second pipe 5 terminate in the interior of the inner cover 3. Accordingly, cables may be fed through the cable glands 8 of the output cable holes 7, after which they are protected from the environment outside the inner cover 3 by the tight connection between the inner cap 31, inner base plate 30, and the first ends 40, 50 of the first and second pipes 4, 5. Still referring to Figure 1, the first pipe 4 and second pipe 5 are fittingly connected to the outer cover 2 and inner cover 3 with, respectively, their second ends 41, 51 and their first ends 40, 50.
The outer base plate 20 and the inner base plate 30 are therefore both provided with through-holes 9 configured to receive said first ends 40, 50 and second ends 41, 51 of the pipes 4, 5. In accordance with the above description of Figure 1, the PV string feed through unit 1 provides in its interior a shielded environment for cables, i.e. wires (for instance of a PV string), being fed therethrough. This is achieved by the sealing effect provided by the manner of connection between the outer base plate 20, outer cap 21, and the second ends 41, 51 of the pipes 4, 5, as well as the manner of connection between the inner base plate 30, inner cap 31, and the first ends 40, 50 of the pipes 4, 5 and finally the cable glands 8 of the input cable holes 6 and output cable holes 7.
Turning to Figure 2, a schematic side view of a feed-through unit 1 is shown, wherein it is installed through a constructional element 100 of a building, which may for instance be a roofing element,
such as roofing isolation. In particular, the unit 1 is installed through a single mounting hole 101 which is drilled or otherwise applied to the constructional element 100. Alternatively, for instance two mounting holes (not shown) may be provided in the constructional element, each configured to receive one of the first pipe 4 and the second pipe 5 of the unit 1 therethrough.
In the example shown in Figure 2, five cables 10 are fed through the feed-through unit 1. These cables 10 represent two strings of two groups of photovoltaic solar panels (not shown), and comprise two positive wires 10a, two negative wires 10b, and one shared grounding wire 10c. The positive wires 10a and negative 10b wires are fed through different ones of the pipes 4, 5, such that the chance of damage due to short circuit between the positive and negative wires 10a, 10b is effectively mitigated. In this example the positive wires 10a are fed through the outer cover 2, through the first pipe 4, and through the inner cover 3. The negative wires 10b are fed through the outer cover 2, the second pipe 5, and the inner cover 3. The grounding wire 10c may be fed through either of the first and second pipes 4, 5 but is in the example of Figure 2 fed through the outer cover 2, the second pipe 5, and the inner cover 3. Still referring to Figure 2, the outer cover 2 abuts, with its outer base plate 20, the outer side 102 of the constructional element 100. The inner cover 3 abuts, with its inner base plate 30, the inner side 103 of the constructional element. The outer base plate 20 and the inner base plate 30 thus form a seal for the mounting hole 101 of the constructional element 100, such that the interior of the mounting hole 101 is protected from the environments on the outer side 102 and inner side 103 of the constructional element 100. The outer side 102 may for instance be on an exterior of a building (not shown) and the inner side 103 may be on an interior side of a building (not shown). The constructional element 100 may be a roofing element, such that the outer side 102 faces substantially upwards on an outer side of a building, and the inner side 103 faces substantially downwards on an inner side of a building. The solar panels (not shown) which are connected to the wires 10 may also be place upon the outer side 102 of the constructional element 100. The outer base plate 20 and inner base plate 30 may be provided with centering tabs 11, protruding outwards from the outer and inner covers 2, 3. These centering tabs 11, as visible in Figure 2, are provided spaced apart from each other, at a fitting distance, such that the feed-through unit 1 may be centered in the mounting hole 101 through the constructional element 100. The fitting distance corresponds approximately to the diameter of the mounting hole 101, which diameter is for instance in the range of 100 to 200 mm, more preferably 135 — 165 mm, and even more preferably about 152 mm.
With reference to Figure 2, the feeding of two photovoltaic (PV) strings 10 through a constractional element 100 is herewith described. The string 10 comprises two positive wires 10a and two negative wires 10b, as well as a grounding wire 10c. Firstly, one mounting hole 101 is provided through the constructional element 100, after which the first pipe 4 and the second pipe 5 are fed through the mounting hole 101. First ends 40, 50 (see Figure 3) of the pipes 4, 5 are then fittingly mounted in respective through-holes 9 of the inner base plate 30. The inner base plate 30 is subsequently fastened to the inner side 103 of the constructional element 100, for instance by screwing the inner base plate 30 to the inner side 103 of the constructional element 100 through the fastener holes 12 of the inner base plate 30. The inner base plate 30 thus abuts the inner side 103 of the constructional element 100. Subsequently, the second ends 41, 51 of the pipes 4, 5 are fed through the through-holes 9 of the outer base plate 20, until the outer base plate 20 abuts the outer side 102 of the constructional element 100. Optionally, the outer base plate 20 may be fastened to the outer side 102 of the constructional element 100.
The pipes 4, 5 and inner and outer base plates 30, 20 are then fixated with respect to the constructional element 100. In some cases, depending on the length of the mounting hole 101 (and/or the thickness of the constructional element 100), the pipes 4, 5 protrude substantially from the outer base plate 20 outwards from the outer side 102. The pipes 4, 5 may then be shortened such that the outer cap 21 can be placed upon the outer base plate 20 without contacting the second ends 41, 51 of the pipes 4, 5. Upon placement of the pipes 4, 5 and the base plates 20, 30 the cables 10 may be fed through the pipes 4, 5 and thereby through the constructional element 100. The positive wires 10a are fed through one pipe (in this case the first pipe 4), and the negative wires [0b are fed through another pipe (in this case the second pipe 5). The grounding wire 10c can be fed through either pipe (in this case the second pipe 5). The cables 10 may thereafter be fed through the input cables holes 6 and the output cable holes 7 which are, respectively, provided in the outer cap 21 and inner cap 31. The caps 21, 31 are then mounted to the base plates 20, 30, after which the installation of the feed-through unit 1 in the mounting hole 101 is completed.
In accordance with the above, the unit 1 provides a seal for the mounting hole 101 through the constructional element 100, and provides a substantially water- and/or airtight environment within the interior of the unit 1. Accordingly, the wires 10 of the PV string, being the power output of (one or more groups of) solar panels, can be fed through a constructional element 100 of a building, such as a roofing element, in a safe, reliable, and permanent manner, without significant required labor.
Figure 3 shows an exploded view of the PV string feed-through unit 1. The first pipe 4 and the second pipe 5 are both provided with external screw thread 42, 43, 52, 53. From their first ends 40, 50 the pipes 4, 5 are provided with external screw thread 42, 52 which is compatible with the internal screw thread of the through-holes 9b of the inner base plate 30. Hence, the pipes 4, 5 can be screwed in the through-holes 9b of the inner base plate 30. The through-holes 9a of the outer base plate 20 are in this case not provided with internal screw thread, as the pipes 4, 5 must be slid therethrough with their second ends 41, 51. However, adjacent their second ends 41, 51 the pipes 4, 5 are provided with external screw thread 43, 53 for engagement with fastening means, such as nuts 13. The nuts 13 may be used to clamp the outer base plate 20 against the outer side 102 of the constructional element 100 (see Figure 2). The external screw thread 43, 53 adjacent the second ends 41, 51 extends along a significant portion of the exterior of the pipes 4, 5, such that the pipes 4, 5 may be shortened from their second ends 41, 51 if desired, without losing the possibility to provide nuts 13 to clamp the outer base plate 20 against the outer side 102.
Figure 3 further shows an enlarged view of the centering tabs 11, which have been described earlier. As visible in the enlarged view, the centering tabs 11 are preferably narrowed at their base, such that they may easily be broken off when not required. For instance, when two mounting holes {not shown) are provided (one for each pipe 4, 5), the centering tabs 11 are not required and may actually cause the base plates 20, 30 to be lifted away from the outer side 102 or inner side 103 of the constructional element 100. Accordingly, the centering tabs 11 may then be broken off, i.e. snapped off, cut off, or the like.
It is noted that the above detailed description of the drawings is in no way intended to limit the scope of protection which is conferred by the enclosed set of claims. In other words, the above examples are merely of exemplary nature and are not to be construed as limitations to the present invention.

Claims (20)

Conclusies i. Fotovoltaische (PV) streng-doorvoereenheid (Engels: “PV string feed-through unit”) voor het doorvoeren van ten minste één PV -streng door een constructie-element, waarbij de streng ten minste een positieve draad en een negatieve draad omvat, de PV- streng-doorvoereenheid omvattende: een eerste pijp welke is ingericht om de positieve draad van de streng te ontvangen, en is ingericht om door het constructie-element gevoerd te worden; een tweede pijp welke is ingericht om de negatieve draad van de streng te ontvangen, en is ingericht om door het constructie-element gevoerd te worden; een binnenste afdekking, welke is ingericht om tegen een binnenste zijde van het constructie-element aan te liggen, en om een eerste uiteinde van de eerste pijp en een eerste uiteinde van de tweede pijp te ontvangen en te omsluiten, en is voorzien van ten minste twee doorgaande gaten voor het passend ontvangen van de eerste uiteinden van de eerste pijp en de tweede pijp, waarbij de binnenste afdekking is voorzien van ten minste twee uitvoerkabelgaten, elk ingericht om één van de negatieve draad en de positieve draad daardoorheen te ontvangen; een buitenste afdekking, welke is ingericht om tegen een buitenste zijde van het constructie-element aan te liggen, en om een tweede uiteinde van de eerste pijp en een tweede uiteinde van de tweede pijp te ontvangen en te omsluiten, en is voorzien van ten minste twee doorgaande gaten voor het passend ontvangen van de tweede uiteinden van de eerste pijp en de tweede pijp, waarbij de buitenste afdekking is voorzien van ten minste twee invoerkabelgaten, elk ingericht om één van de negatieve draad en de positieve draad daardoorheen te ontvangen, en waarbij de invoerkabelgaten elk zijn voorzien van afdichtingsmiddelen voor het water- en/of luchtdicht doorvoeren van één van de negatieve draad en de positieve draad.Conclusions i. Photovoltaic (PV) strand feed-through unit (English: “PV string feed-through unit”) for feeding at least one PV strand through a construction element, the strand comprising at least a positive wire and a negative wire, the PV strand feed-through unit comprising: a first pipe adapted to receive the positive wire from the strand, and adapted to be passed through the structural member; a second pipe adapted to receive the negative wire from the strand, and adapted to be passed through the construction element; an inner cover adapted to abut an inner side of the structural member and to receive and enclose a first end of the first pipe and a first end of the second pipe, and comprising at least two through holes for fittingly receiving the first ends of the first pipe and the second pipe, the inner cover having at least two output cable holes, each adapted to receive one of the negative wire and the positive wire therethrough; an outer cover adapted to abut against an outer side of the structural element and to receive and enclose a second end of the first pipe and a second end of the second pipe, and comprising at least two through holes for fittingly received the second ends of the first pipe and the second pipe, the outer cover having at least two input cable holes, each adapted to receive one of the negative wire and the positive wire therethrough, and wherein the input cable holes are each provided with sealing means for watertight and/or airtight passage of one of the negative wire and the positive wire. 2. PV-streng-doorvoereenheid volgens conclusie 1, de binnenste afdekking omvattende: een binnenste bodemplaat, welke is ingericht om tegen de binnenste zijde van het constructie-element aan te liggen, en is voorzien van de ten minste twee doorgaande gaten van de binnenste afdekking, en een binnenste kap welke is ingericht om te worden bevestigd aan de binnenste bodemplaat, waarbij de binnenste Kap is voorzien van de uitvoerkabelgaten; en/of de buitenste afdekking omvattende: een buitenste bodemplaat, welke is ingericht om tegen de buitenste zijde van het constructie-element aan te liggen, en is voorzien van de ten minste twee doorgaande gaten van de buitenste afdekking, en een buitenste kap welke is ingericht om te worden bevestigd aan de buitenste bodemplaat, waarbij de buitenste kap is voorzien van de invoerkabelgaten.The PV string transit unit according to claim 1, the inner cover comprising: an inner bottom plate arranged to abut against the inner side of the construction element, and having the at least two through holes of the inner cover, and an inner hood adapted to be attached to the inner bottom plate, the inner hood having the output cable holes; and/or the outer cover comprising: an outer bottom plate, which is arranged to abut against the outer side of the construction element, and which is provided with the at least two through-holes of the outer cover, and an outer cover which is adapted to be attached to the outer bottom plate, the outer cover having the input cable holes. 3. PV-streng-doorvoereenheid volgens conclusie 1 of 2, waarbij de buitenste afdekking is ingericht om de tweede uiteinden van de eerste en tweede pijpen op in hoofdzaak water- en/of luchtdichte wijze te omsluiten, en/of waarbij de binnenste afdekking is ingericht om de eerste uiteinden van de eerste en tweede pijpen op in hoofdzaak water- en/of luchtdichte wijze te omsluiten.The PV string transit unit of claim 1 or 2, wherein the outer cover is arranged to enclose the second ends of the first and second pipes in a substantially watertight and/or airtight manner, and/or wherein the inner cover is arranged to enclose the first ends of the first and second pipes in a substantially watertight and/or airtight manner. 4. PV-streng-doorvoereenheid volgens een der voorgaande conclusies, waarbij de uitvoerkabelgaten van de binnenste afdekking zijn voorzien van afdichtingsmiddelen voor het water- en/of luchtdicht doorvoeren van de negatieve draad en de positieve draad.A PV string feed-through unit according to any one of the preceding claims, wherein the output cable holes of the inner cover are provided with sealing means for watertight and/or airtight passage of the negative wire and the positive wire. 5. PV-streng-doorvoereenheid volgens een der voorgaande conclusies, waarbij de afdichtingsmiddelen een kabelwartel omvatten.PV string feed-through unit according to one of the preceding claims, wherein the sealing means comprise a cable gland. 6. PV-streng-doorvoereenheid volgens een der voorgaande conclusies, waarbij de ten minste twee doorgaande gaten van de binnenste afdekking zijn voorzien van intern schroefdraad, en de eerste pijp en de tweede pijp elk zijn voorzien, langs ten minste een deel van diens lengte, van extern schroefdraad aangrenzend aan diens eerste uiteinden, zodanig dat de eerste pijp en de tweede pijp kunnen worden bevestigd aan de binnenste afdekking door middel van vastschroeven.A PV string conduit unit according to any one of the preceding claims, wherein the at least two through-holes of the inner cover are internally threaded, and the first pipe and the second pipe are each provided along at least a portion of its length , externally threaded adjacent its first ends, such that the first pipe and the second pipe can be secured to the inner cover by screwing. 7. PV-streng-doorvoereenheid volgens een der voorgaande conclusies, waarbij de binnenste afdekking bevestigingsmiddelen omvat welke zijn ingericht om bevestiging van de doorvoereenheid aan de binnenste zijde van het constructie-element mogelijk te maken.A PV string bushing unit according to any one of the preceding claims, wherein the inner cover comprises fastening means which are adapted to allow fastening of the bushing unit to the inner side of the construction element. 8. PV-streng-doorvoereenheid volgens een der voorgaande conclusies, waarbij de eerste pijp en de tweede pijp elk zijn voorzien, langs ten minste een deel van diens lengte, van extern schroefdraad aangrenzend aan diens tweede uiteinden, waarbij het externe schroefdraad is ingericht om een bevestigingsmiddel, in het bijzonder een moer, te ontvangen, teneinde het mogelijk te maken de buitenste afdekking tegen de buitenste zijde van het constructie-element aan te trekken.The PV string transit unit of any preceding claim, wherein the first pipe and the second pipe are each provided, along at least a portion of its length, with external threads adjacent its second ends, the external threads being adapted to to receive a fastener, in particular a nut, to allow the outer cover to be pulled against the outer side of the construction element. 9. PV-streng-doorvoereenheid volgens een der voorgaande conclusies, waarbij de binnenste afdekking en/of de buitenste afdekking centreringslippen omvatten die buitenwaarts daarvan uitsteken, waarbij de centreringslippen zich op afstand van elkaar bevinden, op een montageafstand, zodanig dat de doorvoereenheid kan worden gecentreerd in een montagegat door het constructie-element, welk montagegat bij voorkeur een binnendiameter heeft die in hoofdzaak overeenkomt met de montageafstand.The PV string bushing according to any one of the preceding claims, wherein the inner cover and/or the outer cover include centering tabs projecting outwardly therefrom, the centering tabs being spaced apart by a mounting distance such that the bushing can be mounted. centered in a mounting hole through the construction element, which mounting hole preferably has an inner diameter substantially corresponding to the mounting distance. 10. PV-streng-doorvoereenheid volgens een der voorgaande conclusies, waarbij de streng voorts een aardedraad omvat, en de binnenste afdekking en de buitenste afdekking respectievelijk een verder uitvoerkabelgat en een verder invoerkabelgat omvatten, welke zijn ingericht om de aardedraad daardoorheen te ontvangen.The PV strand feed-through unit according to any preceding claim, wherein the strand further comprises a ground wire, and the inner cover and the outer cover comprise a further output cable hole and a further input cable hole, respectively, which are adapted to receive the ground wire therethrough. 11. PV-streng-doorvoereenheid volgens een der voorgaande conclusies, waarbij de ten minste ene streng ten minste twee strengen omvat met twee positieve draden, twee negatieve draden, en één aardedraad, en de binnenste afdekking en de buitenste afdekking respectievelijk vijf uitvoerkabelgaten en vijf invoerkabelgaten omvatten, elk ingericht om één van de twee positieve draden, de twee negatieve draden, en de ene aardedraad daardoorheen te ontvangen.The PV strand feedthrough unit of any preceding claim, wherein the at least one strand comprises at least two strands having two positive wires, two negative wires, and one ground wire, and the inner cover and the outer cover have five output cable holes and five respectively. input cable holes, each adapted to receive one of the two positive wires, the two negative wires, and the one ground wire therethrough. 12. Werkwijze voor het doorvoeren van ten minste één fotovoltaïsche (PV) streng door een constructie-element, waarbij de streng ten minste een positieve draad en een negatieve draad omvat, de werkwijze omvattende de stappen van: het verschaffen van ten minste één montagegat door het constructie-element; het doorvoeren van een eerste pijp en een tweede pijp door het ten minste ene montagegat; het passend monteren van een eerste uiteinde van de eerste pijp en een eerste uiteinde van de tweede pijp in respectieve doorgaande gaten van een binnenste afdekking, waarbij de binnenste afdekking is voorzien van ten minste twee uitvoerkabelgaten, waarbij elk uitvoerkabelgat is ingericht om één van de negatieve draad en de positieve draad daardoorheen te ontvangen; het bevestigen van de binnenste afdekking aan een binnenste zijde van het constructie-element, zodanig dat de binnenste afdekking tegen de binnenste zijde van het constructie-element aanligt; het doorvoeren van een tweede uiteinde van de eerste pijp en een tweede uiteinde van de tweede pijp door respectieve doorgaande gaten van een buitenste afdekking, waarbij de buitenste afdekking is voorzien van ten minste twee invoerkabelgaten, waarbij elk invoerkabelgat is ingericht om één van de negatieve draad en de positieve draad daardoorheen te ontvangen, en waarbij de invoerkabelgaten elk zijn voorzien van afdichtingsmiddelen voor het water- en/of luchtdicht doorvoeren van de negatieve draad en de positieve draad; het doorvoeren van de positieve draad door een invoerkabelgat van de buitenste afdekking, de eerste pijp, en een uitvoerkabelgat van de binnenste afdekking; en het doorvoeren van de negatieve draad door een ander invoerkabelgat van de buitenste afdekking, de tweede pijp, en een ander uitvoerkabelgat van de binnenste afdekking.A method of passing at least one photovoltaic (PV) strand through a structural element, the strand comprising at least one positive wire and one negative wire, the method comprising the steps of: providing at least one mounting hole through the construction element; passing a first pipe and a second pipe through the at least one mounting hole; fittingly mounting a first end of the first pipe and a first end of the second pipe in respective through-holes of an inner cover, the inner cover having at least two output cable holes, each output cable hole being arranged to accept one of the negative wire and receive the positive wire through it; attaching the inner cover to an inner side of the construction element such that the inner cover abuts against the inner side of the construction element; passing a second end of the first pipe and a second end of the second pipe through respective through holes of an outer cover, the outer cover having at least two input cable holes, each input cable hole being arranged to accept one of the negative wire and receiving the positive wire therethrough, and wherein the input cable holes are each provided with sealing means for watertight and/or airtight passage of the negative wire and the positive wire; passing the positive wire through an input cable hole of the outer cover, the first pipe, and an output cable hole of the inner cover; and passing the negative wire through another input cable hole of the outer cover, the second pipe, and another output cable hole of the inner cover. 13. Werkwijze volgens conclusie 12, de stap van het doorvoeren van de tweede uiteinden van de eerste pijp en de tweede pijp door respectieve doorgaande gaten van de buitenste afdekking omvattende, het doorvoeren van de tweede uiteinden door de doorgaande gaten totdat de buitenste afdekking tegen een buitenste zijde van het constructie-element aanligt.The method of claim 12, comprising the step of passing the second ends of the first pipe and the second pipe through respective through-holes of the outer cover, passing the second ends through the through-holes until the outer cover abuts a outer side of the construction element. 14. Werkwijze volgens conclusie 12 of 13, de binnenste afdekking omvattende: een binnenste bodemplaat, welke is ingericht om tegen de binnenste zijde van het constructie-element aan te liggen, en is voorzien van de ten minste twee doorgaande gaten van de binnenste afdekking, en een binnenste kap welke is ingericht om te worden bevestigd aan de binnenste bodemplaat, waarbij de binnenste kap is voorzien van de uitvoerkabelgaten; en/of de buitenste afdekking omvattende: een buitenste bodemplaat, welke is ingericht om tegen de buitenste zijde van het constructie-element aan te liggen, en is voorzien van de ten minste twee doorgaande gaten van de buitenste afdekking, en een buitenste kap welke is ingericht om te worden bevestigd aan de buitenste bodemplaat, waarbij de buitenste kap is voorzien van de invoerkabelgaten.A method according to claim 12 or 13, the inner cover comprising: an inner bottom plate, which is arranged to abut against the inner side of the construction element, and is provided with the at least two through holes of the inner cover, and an inner cap adapted to be attached to the inner bottom plate, the inner cap having the output cable holes; and/or the outer cover comprising: an outer bottom plate, which is arranged to abut against the outer side of the construction element, and which is provided with the at least two through-holes of the outer cover, and an outer cover which is adapted to be attached to the outer bottom plate, the outer cover having the input cable holes. 15. Werkwijze volgens een der conclusies 12 — 14, de stap van het verschaffen van ten minste één montagegat omvattende: het verschaffen van een eerste montagegat voor de eerste pijp, en een tweede montagegat voor de tweede pijp.The method of any one of claims 12 to 14, the step of providing at least one mounting hole comprising: providing a first mounting hole for the first pipe, and a second mounting hole for the second pipe. 16. Werkwijze volgens een der conclusies 12 — 15, waarbij de doorgaande gaten van de binnenste afdekking zijn voorzien van intern schroefdraad, en de eerste pijp en de tweede pijp elk zijn voorzien, langs ten minste een deel van diens lengte, van extern schroefdraad aangrenzend aan diens eerste uiteinden, en de stap van het monteren van de eerste uiteinden van de eerste pijp en de tweede pijp in respectieve doorgaande gaten van de binnenste afdekking omvattende: het schroeven van de eerste pijp en de tweede pijp in de doorgaande gaten van de binnenste afdekking.A method according to any one of claims 12 to 15, wherein the through-holes of the inner cover are internally threaded, and the first pipe and the second pipe are each provided, along at least a portion of its length, with externally threaded contiguous threads. at its first ends, and the step of mounting the first ends of the first pipe and the second pipe in respective through-holes of the inner cover comprising: screwing the first pipe and the second pipe into the through-holes of the innermost cover cover. 17. Werkwijze volgens een der conclusies 12 — 16, waarbij, indien de eerste pijp en de tweede pijp langer zijn dan het montagegat door het constructie-element, de werkwijze voorts de stap omvat van: het inkorten van de eerste pijp en de tweede pijp zodat de buitenste afdekking de tweede uiteinden van de eerste pijp en de tweede pijp kan omsluiten zonder contact te maken met de tweede uiteinden van de eerste pijp en de tweede pijp, en het inkorten van de eerste pijp en de tweede pijp bij voorkeur omvattende: het zagen, snijden, breken, en/of afknippen van een lengte van de eerste pijp en een lengte van de tweede pijp vanaf de tweede uiteinden daarvan.A method according to any one of claims 12 to 16, wherein if the first pipe and the second pipe are longer than the mounting hole through the structural member, the method further comprises the step of: shortening the first pipe and the second pipe so that the outer cover can enclose the second ends of the first pipe and the second pipe without contacting the second ends of the first pipe and the second pipe, and preferably shortening the first pipe and the second pipe comprising: sawing, cutting, breaking, and/or shearing a length of the first pipe and a length of the second pipe from the second ends thereof. 18. Werkwijze volgens ten minste conclusies 14 en 17, waarbij de stap van het inkorten van de eerste pijp en de tweede pijp wordt uitgevoerd na de stap van het doorvoeren van de tweede uiteinden van de eerste pijp en de tweede pijp door respectieve doorgaande gaten van de buitenste bodemplaat.A method according to at least claims 14 and 17, wherein the step of shortening the first pipe and the second pipe is performed after the step of passing the second ends of the first pipe and the second pipe through respective through holes of the outer bottom plate. 19. Werkwijze volgens een der conclusies 12 — 18, waarbij de uitvoerkabelgaten zijn voorzien van afdichtingsmiddelen voor het water- en/of luchtdicht doorvoeren van één van de negatieve draad en de positieve draad.A method according to any one of claims 12 - 18, wherein the output cable holes are provided with sealing means for watertight and/or airtight passage of one of the negative wire and the positive wire. 20. Werkwijze volgens conclusie 19, waarbij de afdichtingsmiddelen een kabelwartel omvatten, de werkwijze voorts omvattende de stappen van: het doorvoeren van de positieve draad door een kabelwartel van de buitenste afdekking, en de negatieve draad door een andere kabelwartel van de buitenste afdekking; en het doorvoeren van de positieve draad door een kabelwartel van de binnenste afdekking, en de negatieve draad door een andere kabelwartel van de binnenste afdekking.The method of claim 19, wherein the sealing means comprises a cable gland, the method further comprising the steps of: passing the positive wire through one cable gland of the outer cover, and the negative wire through another cable gland of the outer cover; and passing the positive wire through one cable gland of the inner cover, and the negative wire through another cable gland of the inner cover.
NL2026666A 2020-10-13 2020-10-13 Photovoltaic string feed-through unit and associated method NL2026666B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120090263A1 (en) * 2010-10-14 2012-04-19 D Three Enterprises, Llc Flashing Assembly
US8695291B2 (en) * 2011-05-02 2014-04-15 Dow Global Technologies Llc Through roof connector assembly for a photovoltaic building sheathing element
US20180026575A1 (en) * 2016-07-25 2018-01-25 Sunpower Corporation Solar roof mounting surface transition
US20200041046A1 (en) * 2018-08-01 2020-02-06 Eran Karpel Transferring Apparatus For Pipeline And Electricity Wiring Insertion Into Residential Secured Spaces

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120090263A1 (en) * 2010-10-14 2012-04-19 D Three Enterprises, Llc Flashing Assembly
US8695291B2 (en) * 2011-05-02 2014-04-15 Dow Global Technologies Llc Through roof connector assembly for a photovoltaic building sheathing element
US20180026575A1 (en) * 2016-07-25 2018-01-25 Sunpower Corporation Solar roof mounting surface transition
US20200041046A1 (en) * 2018-08-01 2020-02-06 Eran Karpel Transferring Apparatus For Pipeline And Electricity Wiring Insertion Into Residential Secured Spaces

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