GB2548192A - Cable gland tightening method and guide - Google Patents

Cable gland tightening method and guide Download PDF

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Publication number
GB2548192A
GB2548192A GB1700066.2A GB201700066A GB2548192A GB 2548192 A GB2548192 A GB 2548192A GB 201700066 A GB201700066 A GB 201700066A GB 2548192 A GB2548192 A GB 2548192A
Authority
GB
United Kingdom
Prior art keywords
cable
tape
turns
gland
cable gland
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB1700066.2A
Other versions
GB201700066D0 (en
Inventor
Lowson Andrew
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CMP Products Ltd
Original Assignee
CMP Products Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CMP Products Ltd filed Critical CMP Products Ltd
Priority to GB1700066.2A priority Critical patent/GB2548192A/en
Publication of GB201700066D0 publication Critical patent/GB201700066D0/en
Publication of GB2548192A publication Critical patent/GB2548192A/en
Withdrawn legal-status Critical Current

Links

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
    • H02G15/00—Cable fittings
    • H02G15/013—Sealing means for cable inlets
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • G09F3/0295—Labels or tickets for tubes, pipes and the like
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/34—Apparatus or processes specially adapted for manufacturing conductors or cables for marking conductors or cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/34—Apparatus or processes specially adapted for manufacturing conductors or cables for marking conductors or cables
    • H01B13/344—Apparatus or processes specially adapted for manufacturing conductors or cables for marking conductors or cables by applying sleeves, ferrules, tags, clips, labels or short length strips
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/56—Insulating bodies
    • H01B17/58—Tubes, sleeves, beads, or bobbins through which the conductor passes
    • H01B17/583—Grommets; Bushings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/36—Insulated conductors or cables characterised by their form with distinguishing or length marks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/36—Insulated conductors or cables characterised by their form with distinguishing or length marks
    • H01B7/368—Insulated conductors or cables characterised by their form with distinguishing or length marks being a sleeve, ferrule, tag, clip, label or short length strip
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Cable Accessories (AREA)

Abstract

A tape 110 for use in determining a number of turns to be applied to a nut of a cable gland for tightening the cable gland onto a cable 140. The tape 110 has graduations 114 indicating a recommended number of turns to be applied to the nut of the cable gland for tightening the cable gland onto the cable 140 of corresponding circumference. The distance of each graduation 114 from a reference point 116 on the tape 1 is substantially equal to the corresponding circumference of the cable. Therefore the number of turns is determined with reference to the circumference (or diameter) of the cable.

Description

CABLE GLAND TIGHTENING METHOD .AND GLIDE FIELD 01·· THE INVENTION
The present invention relates to a tape or guide for use in determining a number of turns to be applied to a nut of a cable; gland for tightening the cable gland seal onto a cablef and a method for tightening a cable gland:, including a method of using the tape. The invention also relates to a method for determining a number of turns for tightening a* cable grand onto a cable, inclucsirig a method for producing the tape. background to the invention
The use of cable glands to; attach and secure a cable to equipment, for example a terminal box, is well known. Such glands may provide a secure and/or sealed junction between the cable and a; rerrninal box into which the cable extends. The cable gland nay provide a waterproof or water resistant seal, arid / or ah electrical Connection between the outer sheath of a cable sand the terminal box.
The part of the cable gland which attaches to a cable generally is formed; from two substantially cylindrical portions through which the cable passes;;. The two portions; are coupled to each other by correspondingly threaded surfaces. By rotating the two portions relative to each other, the two port ions are brought closer together, and a seal member positioned between the two portions id displaced,, compressed and/or distorted such that the seal; member is brought into contact with the cable. In this -way, the cable gland; and cable are £ irmly secured together. By attaching the; gable glared to equipment, such as a terminal box, bne cable is securely held in place relalive to the equipment. A problem with cable glands is that there: is an optimum:: seal corap re s s i on, but they are susceptible to being over-tightened:. This may compress the seal member to such an extent that it caused damage to tie seal or other grand components. ©ver~tightening may ai so cause damage to tee
Gabie; outer sheath.
In order tg 'prevent users from over tightening cable glands,: manufacturers may supply usage instructruns with their products* Fo r example! the usage x n s t r u c 11 ο n s may state that cable glands are to he tightened 'hand-right' plus one turn using a spanner. However this; type of instruction does not take into account the size: of the; cable gland., the perception of what 'hand tight' is or the size; of the cable with which it is being used, and therefore does not always result in Optimum performance of a cable" gland,: ihe present invention seeks to overcome the above problems.
SUMMARY :|f WE IHYENTIOK
According to an aspect Of the present invention there j_s provided a tape for Use in detabmihinf a number of turns, ro be applied to a cable gland for tightening a cable gland onto a cable, the tape comprising graduations indicating a recommended: number of turns" to be applied to m cable; g ..and for tightening the cable gland onto a cable having a corresponding circumference, the: distance of each graduation ptorti a reference point on the tape being substantially equal to the corresponding circumference.
Advantageously, the tape provides a means for deter raining a recommended number of turns fb be applied to the cable gland, which may vary depending on the size of the cable to be used. In partIcilam, the recommended:: number of turns din be detar mined in a single Operation, without the need to separately measure the gable size and then look up a recommended number1 of turns for the measured cable size.
The tape may comprise a plurality of s e t s of g:raduations::, each set corresponding to a different size of cable gland.
The advantage of this feature is that a single tape can be used as a tightening guide for a number of different:: sizes: of cable gland.
The tape may further comprise graduations indicating a recommended cable gland size to be used with a cable having a corresponding circumference, the distance of each graduation frora a reference point on the tape heing suharaniially eqaai to the corresponding Clrddmference:,
The advantage of thi s -.,, v,......., . ,, .. . , , " -·''·-* e is mat the rape may be used both to select the ........, pre,.erred cable gland size for a given cable, based on the size ,-,f m . . : oi the Ctrl®, and to determine the recommended number of t-urn^ = ... , , ° ’-° be used for tightening the selected cable gland onto the cable
Aecpraing to a second aspect .* . - °I the invention, there is provided a cable aland ki r . ’ •'•'fiiprisi.ncj at least one cable: gland, and at least one tana ar ^
Lapo acs defined above.
According to a third aspect of the in vent ion, there is provided a method for determining a number of turns to: be applied to a cable gland for tightening a cable:; gland onto a cable, psing a tape as defined above; the method comprising:; wrapping the tape: around the cable; and determining the number of turns based on the graduations on the tape.
The number of turns map be determined by identifying a graduation 'which is closest to the reference point.
The method may further comprise selecting: a set of graduations corresponding to the size of the cable gland, wherein the number of turns is: determined based on graduations belonging to the selected set of graduations.
The method may further comprise applying the determined number of turns to the cable gland to tighten the cable gland. using the tape to determine the number of turns to be applied to the cable gland reduces the likelihood of damage to the cable due to over-tightening, and may ensure that the cache gland is tightened by an amount which provides optimum functionality, for example, sealing effectiveness or pull-out resistance, 'hecord'i ng to a fourth aspect of the invention there is provided a method for tightening a cable gland, the; cable gland comprising a first portion comprising: an Internaliy threaded: .surface and a second port ion comprising an externally threaded surface for coup.I inn to the infernally thre:adad; surface of the first portion, and;: a deformable member, wherein each of the first end second portions comprise a through-hole for receiveng a cable, the first and second portions being adapted to exeri a force on the deformable member placed therebetween to secure the cable to the cable gland, the method comprising the steps ίΟϋ;:: threading a cable through the first and seOdhd portions, the deformable member being positioned between the first and second portions; rotating the second portion re!ative to the first port ion to couple the first and second portions together and to deform the deformable member into contact with the cable; wherein the second portion is rotated by a number of turns determined with reference to the circumference or diameter of the cable.
By tightening the cable gland by a number of turns which is determined with reference to the circumference or diameter of the cable, the process for installing a cable gland oh a cable is adapted to specific size of cable used, so that a good pu Li-out resistance and/or degree of watertightness is obtained, regard Less of the size of the cable.
The method may further comprise the step of;: wrapping a tape around the cable; and determining the number of turns based on an indication from the tape .
The tape may be a tape as defined above.
The number of turns may be determined using the above- defined method for determining a number of turns to be applied to a cable gland for tightening a sable gland onto a cable .
Accordi.ng.Ly td:i a fi£th aspect of the invention there is providea a metnod for determining a number of turns for tightening a cable gland onto a cab le, the cable gland comprising a first portion comprising an internally threaded surrace and a second portion comprising an externally threaded surrace for cou.pl t-_ q the internally threaded surface of the first portion, and a deformable:; member, wherein each of the firsc and second portions and the deformable member comprise ^ through“hole for receiving a cable, the first and second portions being adapted: to exert a force on the deformable member placed therebetween to secure the cable to tne cable gland,: the method comprising: ttreading a cable having a first circumference through first arid secona portions and the deformable member':, the deformable member being Positlonea between the first and second portions; rotating the second portion relative to the first portion to couple the first arid second portions together and to deform the deformable member into contact with: the cable; and measuring a pulling force required to pull the cable from the cable gland as a function, of the number of turns by which the second portion is rotated relative to the first portion.
The method may further comprise repeating the method for cables having different circumferences.
The method may further comprise repeating the method for cable glands of different sizes.
The method may further comprise: providing a tape with a plurality o 1: graduations: corresponding to respective cable circumferences; arjd
Providing an. indication next to at least one graduation of a determ.i ned number of turns co r responamg to the respective cable circumference,
BRIEF DESCRIPTION OF THE FIGURES A preferred embodiment, of: the present invention will how be described, by way of example on J. y and not in any Urnitat ί ve sense, with reference to the accompanying drawings, in which:
Figure 1 shows a tape according to a first, embodiment of the invention:; and
Figure 2 shows the use of a tape according to a second, embodiment Of the invention.*:
DESCRIPTION OF THE EMpilMENTS
Figure 1 shows a tape 10 for use in determining the number pf turns to he applied to a cable gland £'&x tightening a cable gland onto a cable. The; tape 10 has first and second surfaces 12a, 12b, and is marked with graduations 14 a‘c selected distances from a reference mark 16, the distances between the graduations 14 and the reference mark -L0: corresponding to various cable circumferences, The indices 18 next to the graduations 14 indicate a recomirtended number of turns to be applied to a cable gland to secure it onto « cable having the corresponding ci rcum Terence. The tape may be made of any suitable material, in particular tnoso materials corrnonly used for taps; measures, including paPe3'' plastics and fibreglass.
The tape shown in Figure x o°mprises a °" sets 20 of gracMtims 14, each soi 20 corresponding to a different size of cable gland -indicated by oafc...e g_u..d ident, i liers 2 2 .
The tape 10 is used in the f°-lowing way sj cl 9'-iue tightening a cable gland onto a The tape 1G io wrappers around the cable, with the ©nlargeo eno .- 4 o.i. t..e tape: 10 is against the cable, The reference mark 1¾ is printed across the enlarged end — fr‘e l*aPe ~° ^ remains visible when the main 2fj c^e '-aPe 3'-~ oreri.appna w:..th the: end 24. The graduation i4 OiOsest to the reference maf:|: is identiffecb aa£* tne .-.n^iceo 18 associated with the graduations W are uses to r®cj:d: a recommended number of turns associated: with the s exec ted grad jar. ion 1|. Alternatively, if ^16 reference point:: 1ύχ1&: between two: graduations:, then the graduation with the largest number is selected.
The cable gland is then assombleo onto |he cable, finder tightened to remove any slack, and ehe appropriate number ©f spanher turns is applied in order to tignten the cable gland onto the cable.
Figure 2 shows a second embodiment of a tape 1x0 being used in the manner destribed above. Thf:: tape HO is wrapped around a cable 140, and the graduation 1 i4 closest to the reference mark 116 is used to bead off the: recommended number of spanner turns, in this example, three turns.
The tape Γ10 of the second embodiment is designed for use with only one type or size of cable gland and therefore includes only one set of graduations: 114 · When using the tape 10 of the first embodiment, the user must refer to the set 20 of graduations 14 corresponding to the type of cable gland to be used, as indicated by the respective cable gland identifier 22.
The tape 10 of the first embodiment is also provided on one surface 12b with a separate scale 28 indicating a preferred cable gland size depending on a cable size to be used. The scale 28 is marked with graduations 30 and/or ranges 32, each labelled with a cable gland identifier 34. The tape 10 may therefore be used to select a type or size of cable gland appropriate to any given cable, prior to determining the number of turns to be applied to the cable gland. The tape IQ is wrapped around the cable as above, and the range or ranges 32 overlapping with the reference mark 16 corresponds to the preferred type (s) or size(s) of cable glands suitable for use with that cable. In addition, the range of each set 2 0 of graduations 14 may be used to indicate which types or sizes of cable gland are suitable for use with a cable of a particular size. Once a cable gland has been selected, the number of turns to be used to secure it to the cable is then determined as described above with reference to the graduations 14,
The tape 10, 110 may be calibrated according to the following method. Generally, a cable gland includes a first portion having an internally threaded surface and a second portion having a corresponding externally threaded surface. Each of the two portions has a through-hole, through which a cable can be threaded. The first and second portions are coupled together by engaging the threaded surfaces, and rotating one portion, generally known as the outer seal nut, relative to the other to tighten the two portions together. A deformable sealing member, often in the form of a sealing ting:, is located be tween the two port:· or.s, As the two portions are tightened towards each other, the: sealing member is displaced or deformed so that it contacts the cable, thereby clamping the cable in place. measuring the pulling force required to pull the cable from the cable gland, as a function of the number of turns by which the second portion has been rotated relative tp the first portion, the number of turns giving the best pull-out resistance can be determined. For each type or size Of cable gland, this process may be repeated for cables of different diameter. Instead of measuring: maximum pull-out strength, other criteria may be used, for example,: the minimum number of turns required to Obtain the desired pullout resistance, or the number of turns required to obtain a desired degree of water-tightness .
In this way, a seal e 1 s obtained for a recommended number of turns as: a function of cable circumference. This scale is then marked on a tape as described above, for example by printing. Alternatively,, the scale information may be presented as a conversion table:, showing recommended number of turns as a function of cable diameter:: and/or circumference .
When tightening a cable gland onto: a cable, the outer seal hut Of the cable gland may be rotated by a predetermined number of turns, which depends on the circumt erence or diameter of the cable. The predetermined number of turns may be obtained from shale information such as that described above, and mav be obtained by using a tape as described above.
It will be appreciated by persons skilled in the art. that the above embodiments have been described by way of example only, and not in any limitative sense, and that various alterations and modifications are possible without departure from the scope of the invention as defined by the appended claims .

Claims (3)

1, A method for tightening a cable gland, the cable gland comprising a first portion comprising an internally threaded surface and a second portion comprising an externally threaded surface for coupling to the internally threaded surface of the first portion, and a deformable member, wherein each of the first and second portions comprise a through-hole for receiving a cable, the first and second portions being adapted to exert a force on the deformable member placed therebetween to secure the cable to the cable gland, the method comprising the steps of: threading a cable through the first and second portions, the deformable member being positioned between the first and second portions; and rotating the second portion relative to the first portion to couple the first and second portions together and to deform the deformable member into contact with the cable, wherein the second portion is rotated by a number of turns determined with reference to the circumference or diameter of the cable,
2, The method of claim 1, further comprising the step of: wrapping a tape around the cable; and determining the number of turns based on an indication from the tape.
3, A method for tightening a cable gland onto a cable, substantially as described herein.
GB1700066.2A 2010-11-19 2010-11-19 Cable gland tightening method and guide Withdrawn GB2548192A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1700066.2A GB2548192A (en) 2010-11-19 2010-11-19 Cable gland tightening method and guide

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1700066.2A GB2548192A (en) 2010-11-19 2010-11-19 Cable gland tightening method and guide
GB1019625.1A GB2488305B (en) 2010-11-19 2010-11-19 Cable gland tightening method and guide

Publications (2)

Publication Number Publication Date
GB201700066D0 GB201700066D0 (en) 2017-02-15
GB2548192A true GB2548192A (en) 2017-09-13

Family

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Family Applications (3)

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GB1019625.1A Active GB2488305B (en) 2010-11-19 2010-11-19 Cable gland tightening method and guide
GB1700067.0A Active GB2542980B (en) 2010-11-19 2010-11-19 Cable gland tightening method and guide
GB1700066.2A Withdrawn GB2548192A (en) 2010-11-19 2010-11-19 Cable gland tightening method and guide

Family Applications Before (2)

Application Number Title Priority Date Filing Date
GB1019625.1A Active GB2488305B (en) 2010-11-19 2010-11-19 Cable gland tightening method and guide
GB1700067.0A Active GB2542980B (en) 2010-11-19 2010-11-19 Cable gland tightening method and guide

Country Status (1)

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GB (3) GB2488305B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10714922B2 (en) 2018-10-02 2020-07-14 Eaton Intelligent Power Limited Cable gland compression limiter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10714922B2 (en) 2018-10-02 2020-07-14 Eaton Intelligent Power Limited Cable gland compression limiter
US11637419B2 (en) 2018-10-02 2023-04-25 Eaton Intelligent Power Limited Cable gland compression limiter

Also Published As

Publication number Publication date
GB2488305A (en) 2012-08-29
GB201019625D0 (en) 2010-12-29
GB201700066D0 (en) 2017-02-15
GB201700067D0 (en) 2017-02-15
GB2542980A (en) 2017-04-05
GB2488305B (en) 2017-06-07
GB2542980B (en) 2017-06-07

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