wire terminal tang contact area

[paulsquatch]

I need help finding references in the NEC to the proper installation of pressure wire terminals with respect to tang contact area. Is there a minimum percentage of tang surface area which needs to contact the mating surface of a bus bar, ground pad, or another wire terminal tang?

Are there any paragraphs in the code pertaining to stacking multiple pressure wire terminals on the same bolt or stud?

Thanks.

 

[nakulak]

what type of conductors are they and/or what wiring method is involved ?

 

[iwire]

The NEC requires to use connections listed for the purpose and installed per the labeling and instructions.

 

[paulsquatch]

I think i found the answer in the UL Guide Information (CCN # ZMVV) for the Listed terminals:

"Stacking of connectors (multiple connectors assembled using a single bolt, nut and washers) may be permitted where mechanical interference is reduced or eliminated with the use of offset tangs, stacking adapters, and the like. The surface contact area of the mounting tang should make complete contact with the mounting surface or the previously stacked connector tang."​

I will verify this with the lug manufacturer's instructions.

Are there any references to this in the NEC or is it just a UL requirement?

Thanks,
Paul