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
  • H02G3/02—Details
  • H02G3/06—Joints for connecting lengths of protective tubing or channels, to each other or to casings, e.g. to distribution boxes; Ensuring electrical continuity in the joint
  • H02G3/0616—Joints for connecting tubing to casing
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
  • H01R4/28—Clamped connections, spring connections
  • H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
  • H01R4/302—Clamped connections, spring connections utilising a screw or nut clamping member having means for preventing loosening of screw or nut, e.g. vibration-proof connection
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
  • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
  • H01R4/64—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail
  • H01R4/643—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail for rigid cylindrical bodies
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B21/00—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings
  • F16B21/02—Releasable fastening devices locking by rotation
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B2200/00—Constructional details of connections not covered for in other groups of this subclass
  • F16B2200/93—Fastener comprising feature for establishing a good electrical connection, e.g. electrostatic discharge or insulation feature
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
  • H01R4/26—Connections in which at least one of the connecting parts has projections which bite into or engage the other connecting part in order to improve the contact
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
  • H01R4/28—Clamped connections, spring connections
  • H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
  • H01R4/305—Clamped connections, spring connections utilising a screw or nut clamping member having means for facilitating engagement of conductive member or for holding it in position

Definitions

• the invention relates to cable glands for mounting cables through an opening of an enclosure.
• the invention relates to cable glands for mounting EMC or armored cables through an opening on an insulating enclosure and to the earthing assemblies in these cable glands.
• Cable glands are used for mounting cables on an enclosure. Cable glands provide sealing and mechanical and / or electrical connection between the cable and the enclosure.
• a cable gland generally consists of a lower body that is mounted to the enclosure, an upper body that is mounted to the lower body and provides compression of the cable armor, sealing elements to provide sealing, and a cap to compress the insulating portion of the cable.
• the cable gland should provide a good connection between earth and the cable armor. Therefore, considering the safety risks, the cable gland is able to fully transmit short circuit and leakage currents from the cable to earth.
• Metal enclosures are generally preferred for armored cables. A part of the insulation of the armored cable is stripped off to reveal its armor and this part is mounted on the enclosure so that it remains within the cable gland. The armored cable and cable gland are connected to earth with the earthing of the enclosure.
• metal enclosures have some drawbacks. Metals have low corrosion resistance. For this reason, serious problems occur, especially in outdoor applications.
• plastic enclosures are preferred in some cases to reduce component weight and economy. In this case, an earth tag is used between the cable gland and the enclosure to earth the armored cable.
• the earth tag is placed between the enclosure and the cable gland to provide the earthing connection.
• the earth tag generally has a plate shaped body. It comprises a first hole on the body through which the cable gland passes and a second hole through which the earthing connection is made. The second hole is smaller than the first hole.
• the serrated washer is mounted on the lower body of the cable gland and the enclosure during the assembly of the cable gland. Then, the earth tag is mounted and the lower body of the cable gland is fixed to the enclosure by a nut.
• the lower body of the cable gland is kept fixed with an assembly tool, and the assembly of the upper body of the cable gland is done with a separate assembly tool.
• This process has many disadvantages. First, three different assembly operations are performed for mounting the cable gland lower body only. This causes an increase in the assembly time. Secondly, two assembly tools are required to be used in the cable gland assembly and the inspection of the cable shield assembly. This situation both complicates the work of the installer and increases the assembly time. Third, investment in three different products is required for a single size cable gland, increasing the investment cost. On the other hand, the higher the number of assembled parts, the higher the risk of error by the operator.
• GB2116784B describes an earth tag which provides an earthing connection between the enclosure and the cable gland.
• a seal is placed in the opening through which the cable gland passes.
• the earth tag when the earth tag is interposed between the enclosure and the cable gland, it provides sealing and earthing connection.
• These types of earth tags tend to rotate with the cable gland during cable gland assembly. The rotation of the earth tag results in its misplacement and obstructs its assembly. Especially, problems are encountered when the installation space is limited and the cable glands need to be installed close to each other.
• EP1790053B1 discloses an earthing nut that is mounted on a threaded shaft.
• the earthing nut has a nut body that is threaded on the inside and compatible with a wrench on the outside.
• the nut body has at least one threaded opening extending into the interior of the nut body.
• a grub screw passes through the threaded opening and contacts a threaded shaft to which the earthing nut is mounted.
• Earthing is accomplished by fixing the end of an earthing connection to the earthing nut.
• the nut body has at least one second threaded opening extending into the interior of the nut.
• the earthing connection is fixed to the second threaded opening with the help of a screw.
• the earthing nut used for the earthing connection has relatively larger dimensions than a standard nut. This situation increases the amount of raw materials used in the production of the earthing nut.
• the tightening torque of the earthing nut with relatively large dimensions is higher than that of the standard nut.
• EP1194990B1 describes an earth tag with tabs.
• the rotation of the earth tag is prevented by the friction force generated between the tabs and the enclosure.
• a friction force occurs according to the tightening torque applied during the cable gland assembly. Therefore, in practice, it is not always possible to provide the desired friction force between the earth tag and the enclosure.
• high tightening torque is applied to increase the friction force, the enclosure and the armored cable may perhaps be damaged.
• two assembly tools are used to tighten the cable gland in practice. This makes the assembly process difficult and increases the assembly time.
• the connection continuity between the enclosure and the earth tag may be interrupted.
• the invention has been developed with inspiration from existing situation and purposes to eliminate the above-mentioned disadvantages.
• the main purpose of the invention is to develop an economical and simple earthing assembly to be used in cable glands that enable the mounting of armored cables to the opening on an enclosure.
• the earthing assembly comprises a lock nut and an earthing tag.
• Another purpose of the invention is to provide quick and easy assembly of the cable gland.
• the cable gland and earthing assembly can be tightened using a single assembly tool. This provides quick and easy assembly, especially in situations where mounting space is limited and cable glands need to be mounted close to each other.
• Another purpose of the invention is to prevent the earthing tag from rotating during the cable gland assembly.
• the angled protrusions on the earthing tag prevent the rotation of the earthing tag by increasing the friction between the earthing tag and the enclosure.
• the position of the earthing tag relative to the earthing connection remains constant during assembly.
• Another purpose of the invention is to provide the installation of the cable gland from the outside of the enclosure in cases where access to the interior of the enclosure is restricted.
• the locking arm on the earthing tag provides the locking of the earthing tag and the lock nut.
• the cable gland is mounted on the enclosure by tightening the lower body of the cable gland.
• Another purpose of the invention is to provide low contact resistance and effective earthing.
• the earthing assembly allows the earthing connection to be established directly through the cable gland.
• the cable gland can fully transmit short circuit and leakage currents from the armored cable to the earth.
• An effective earthing is provided regardless of the material from which the enclosure is produced. Because short-circuit and leakage currents are fully transmitted to the earth without encountering the resistance of the enclosure.
• the invention is an earthing assembly comprising a lock nut with internal threads is mounted on the externally threaded body of a cable gland and an earthing tag with at least one connection part through which the earthing connection of the cable gland is made in that, the earthing assembly comprises at least one locking arm, which is on the earthing tag and prevents the lock nut and the earthing tag from moving independently of each other.
• Figure 1 is an exploded view of the earthing assembly.
• Figure 2 is a cross sectional view of the mounted earthing assembly.
• the earthing assembly (A) comprises the lock nut (10) and the earthing tag (20).
• the earthing device (A) provides earthing of the cable gland.
• the externally threaded body of the cable gland provides mounting of the cable gland to the enclosure.
• the lock nut (10) has internal threads (12) that mount to the externally threaded body of the cable gland. The lock nut (10) ensures that the cable gland is fixed to the enclosure.
• the earthing tag (20) provides the earthing connection of the cable gland. There is at least one connection part (24), where the earthing connection is made, on the earthing tag (20). In preferred embodiments of the invention, the earthing cable is connected to the connection part (24) by a screw. There is an opening (22) on the earthing tag (20) where the lock nut (10) is placed. The opening (22) has a similar geometry to the external portion (14) of the lock nut (10). Thus, the lock nut (10) is easily placed into the opening (22) of the earthing tag (20). In preferred embodiments of the invention, the external portion (14) of the lock nut (10) and the opening (22) of the earthing tag (20) are in hexagonal geometry.
• the groove (16) prevents the lock nut (10) from falling out of the opening (22) of the earthing tag (20).
• the lock nut (10) is rotated in the opening (22) between 0 - 60°.
• the lock nut (10) is rotated 30°to prevent it from falling out of the opening ( 22).
• At least one locking arm (28) prevents the lock nut (10) and the earthing tag (20) from moving independently of each other.
• the locking arm (28) is pressed when the lock nut (10) is placed into the opening (22) of the earthing tag (20). In this way, the lock nut (10) and the earthing tag (20) do not move independently of each other during the cable gland assembly.
• the protrusion (26) extends outward from the surface of the earthing tag (20) at an angle.
• the protrusion (26) provides an increase in friction between the earthing tag (20) and the enclosure, thus preventing the earthing tag (20) from rotating during the cable gland assembly. Therefore, the initial position of the connection part (24) is prevented from changing during assembly.
• the lock nut (10) is first placed in the opening (22) of the earthing tag (20). Then, the lock nut (10) placed in the opening (22) is rotated between 0 - 60°, preferably 30°, to a po sition where it will not come out of the earthing tag (20). Next, the locking arm (28) is pressed. Thus, the earthing assembly (A) is formed by combining the lock nut (10) and the earthing tag (20).
• the earthing assembly (A) provides an easy assembly of the cable gland with a single assembly tool.
• the cable gland is mounted from the outside of the enclosure.
• the protrusions (26) on the earthing tag (20) are clamped to the enclosure, ensuring that the earthing assembly (A) remains fixed during assembly.
• the lower body of the cable gland can be tightened from the outside of the enclosure using an assembly tool. Another advantage of this situation is that it provides convenience during the inspection/ maintenance of the cable armor assembly in armored cables.

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• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Installation Of Indoor Wiring (AREA)

Applications Claiming Priority (1)

Publications (2)

Family

ID=87000106

Family Applications (1)

Country Status (2)

Family Cites Families (6)

• 2021
  • 2021-12-30 EP EP21970144.8A patent/EP4454086A4/de active Pending
  • 2021-12-30 WO PCT/TR2021/051617 patent/WO2023128897A1/en not_active Ceased

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