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Tuesday, April 26, 2022
Question:
Greetings CQD, Hello, 250.8(A)(6) lists a permitted method for connection of grounding and bonding equipment is thread-forming machine screws that engage not less than 2 threads in the enclosure. Would self-tapping screws be a permitted screw for this?
Ed Glass
A
Answer:
Hello Ed and thanks for the question. Section 250.8(A)(6) recognizes thread-forming machine screws for connection of grounding and bonding equipment. This is often provided by equipment manufacturers for fastening grounding and bonding terminal bars to the enclosures. Self-tapping sheet metal screws are not included in this allowance in our opinion. Hope this is helpful.