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we live in the turk& coicos island we use a main discernnect at are meter service entrance and one at the main distrubation panel
That doesn't make much sense. Sheet-metal screws would hold much better than the other two mentioned in the author's comment. "Author’s Comment: The rule still doesn’t prohibit drywall screws or wood screws from being used for this purpose, just “sheet-metal” screws!"
The word "listed" says it all.
"insurance policies sometimes have clauses in them that will limit their liability in case of a claim made in response to the failure of a non-UL-listed device."
http://www.faqs.org/faqs/electrical-wiring/part1/
Interesting point!
Mike, I was a little concerned about the statement that drywall or wood screws are ok to use. They usually have a beveled head and are not threaded all the way to the head of screw. I would be very skeptical and wary of this connection and would turn down a ground attached with either wood or drywall screws for attaching the ground as shown. Thank you
Dear Sir,
I would like to know in articule 250, which rule deal with the bonding of different grounding electrodes from services like: electricity, communication, antena, lightning, etc. More specificaly lightning electrode shall be bounded or isolated from others grounding electrodes? Thanks Eng. Carlos Haug