After looking closer at 250.8, I can't permit any screws or bolts to be used to connect grounding conductors, except maybe the green 10-32 screws used in small enclosures. The section clearly requires the use of listed means to make the connection. I don't know of any screws or bolts, with the exception of the green 10-32 screws, that are listed for grounding connections. If I have a compression lug with a 3/8" hole on my grounding conductor, how can I connect it to the enclosure or building steel or other metallic object and be in compliance with 250.8?
Don(resqcapt19)
