— Strap-type ground clamps are not suitable for attachment of the grounding conductor of an interior wiring system to a grounding electrode.
Ground clamps and other connectors suitable for use where buried in earth or embedded in concrete are marked for such use. The marking may be abbreviated ‘‘DB’’ (for ‘‘Direct Burial’’).
Listed ground clamps are also suitable for telecommunication applications, such as telephone, radio, CATV and the like, in accordance with Articles 800, 810, 820 and Section 250.94 of the NEC, in addition to those covered under Grounding and Bonding Equipment, Communication (KDSH).
Listed irreversible compression type connectors are suitable for splicing the grounding electrode conductor.
Clamps are intended for use with rod and/or pipe electrodes in accordance with the NEC and are marked with the size of electrode and electrode grounding conductor with which the clamp is intended to be used.
Clamps suitable for use on copper water tubing are marked for such use.
Clamps intended for use with re-bar are marked with the size of re-bar with which the clamp is intended to be used.