UL-467:2013 pdf free download – STANDARD FOR SAFETY Grounding and Bonding Equipment.
6.1.3 Connectors provided as part of a grounding or bonding device shall comply with the construction requirements of
a) NMX-J-543-ANCE, CSA C22.2 No. 65 or UL 486A-486B; or
b) NMX-J-548-ANCE, CSA C22.2 No. 188 or UL 486C and may be made of iron or steel with a steel terminal screw.
6.1.4 Means for the attachment of a grounding or bonding conductor shall be so designed that the conductor is securely and reliably held without depending on solder.
6.1.5 For connectors not covered in Clause 6.1.31 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.
6.1.7 A cast iron part, other than malleable iron, shall be not less than 3.2 mm (1/8 in) 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 if it is ribbed or otherwise reinforced and not marked for direct burial.
6.1.8 A fitting, 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 514B. See Clause 10.4.
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 be 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 clamp 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 clamp 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 clamp 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 designed 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.