Each state and municipality chooses their own standards. But everyone I work in accepts the NEC as its bible. They only difference is some use the 2005 and some use 2008. And no the nec is not suggestions, they are hard rules based on safety and engineering.
And the NEC states every type of acceptable ground there is. If you find a fault with the power ground you should do what you can to correct it. Usually all there is too it is a piece if cooper to a ground rod held on with some type of mechanical connector. How hard is it to fix? And the code does say you should bond your grounds together where possible. If it is not, then use another ground and notate the work order and if there is an issue with the power ground, inform the homeowner and have them sign off on the note. General rule of thumb with anything to do with the NEC codes, last one to touch it owns it. CYA will never get you in trouble. And as stated, an insurance company is going to look to aasign blamne to someone else anytime they get a chance, why put a bulls eye on yourself for a bug nut or a peice of copper.
Re: grounding
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