UL 467:2013 pdf download – Grounding and Bonding Equipment
UL 467:2013 pdf download – Grounding and Bonding Equipment.
6.1.4 Means for the attachment of a grounding or bonding conduclor shall be so designed that the conductor is securely and reliably held without depending on solder.
6.1.5 For connectos not covered in Clause 6.1.3, and where the conductor Is attached by means of a single screw, the size of the screw shall not be smaller than as specified in Table 1.
6.1.6 A wire-binding screw shall be provided with upturned lugs or the equivalent capable of holding a wire under the head of the screw,
6.11 A cast iron part, other than malleable iron, shall be not less than 3.2mm (1/Sin) thick. A malleable iron part, a nonferrous cast-metal part, and a die-cast or extruded part shall be not less than 2.4 mm (3/32 in) thick, except that a die-cast part may be not less than 1.6 mm (1/16 in) thick it it is ribbed or otherwise reinforced and not marked for direct burial.
6.1.8 A fining, such as a hub, a bushing, or a locknut to be used for grounding and intended to provide a rain-tight or liquid-tight connection between threaded metal conduit and a sheet metal enclosure shall comply with the requirements In this Standard and with the requirements for such a fitting in NMX-J-017-ANCE, CSA C22.2 No. 18.3. or UL 5148. See Clause 104.
6.1.9 A device intended for the connection of metal conduit, electrical metallic tubing. or flexible armor shall be provided with an end stop or the equivalent, and if intended for the connection of metal conduit, it shall be provided with not less than three full threads in the metal.
6.2 Protective-type ground clamps
6.2.1 A clamp intended to bo threaded onto or otherwise rigidly attached to any form of metal raceway or flexible armor enclosing a grounding conductor shall be of the protective type. The damp shall be such that the grounding conductor and its connection will be effectively protected against mechanical damage. except that a grounding conductor connection having inherent protection against mechanical damage, because of its size. shape. and the like, is not required to be otherwise protected.
6.2.2 A ground clamp in which the grounding conductor and its connection to the damp is recessed between protective side walls shall be acceptable, provided that such protective walls are not formed by removable parts that are not essential for the assembly of the device.
6.2.3 A protective-type clamp shall provide an electrical and mechanical connection between the grounding electrode and a grounding conductor protected by armor or metal raceway. The mechanical connection shall be rigid if the damp is designed for use with metal conduit.
6.2.4 A protective-type clamp of the strap type shall have a rigid metal base to be seated on the grounding electrode, and if the clamp is desbgned for use with metal conduit, It shall be provided with not less than the applicable number of straps specified in Table 2, depending upon the trade size of metal conduit with which it is intended to be used.
6.3 Strap-type clamps
6.3.1 A strap-type clamp shall not be less than 12.7 mm (112 in) wide and 0.64 mm (0025 in) thick.
6.3.2 A communications strap-type clamp shall not be less than 12.7 mm (1/2 in) in width and not be less than 0.64 mm (0.025 in) in thickness. Strap-type clamps intended for outdoor use shall satisfy the temperature conditioning test descnbed in Clause 9,9.
6.3.3 Commun.cation ground clamps may be in the form of straps of coppe or other suitable metal.
6.3.4 Communication ground straps shall be fitted either with brass or galvanized steel screws.
6.4 ProtectIon against corrosion
6.4.1 A grounding or bonding device shall be protected by a zinc coating at least 0.025 mm (0.001 in) thick, except as follows:
a) if the metal is inherently resistant to corrosion such as nonferrous or stainless steel;
b) a device that is used in conjunction with an electrical metallic raceway or metallic cable system and complies with the corrosion protection requirements for fittings in CSA C222 No. 18.3 or UL 5148;
C) the thickness of the coating shall be at least 0.013 mm (0.0005 in) if the device provides for a direct pa’essure connection between the grouncng or boncng conductor and the surface of an outlet box;
d) the thickness of the coating shall be at least 0.0038 mm (0.00015 In) If the device is intended for use completely inside an outlet box.