What are the true rules on aluminum for a watermain ground ? I have an existing 200 amp service getting replaced Thursday, existing #4 AL crimper to a #4 Cu at the clamp. Is this reusable ? I have normally replaced them with a #4 cu. However, the price of cu and the span i need to run has me edging toward leaving it or upgrading it to a #2 AL with a AL rated waterpipe clamp. Is #4 AL acceptable ? the original installer had recieved an underwriters on it somehow. Normally i'd bite the bullet and replace with CU, but this job has already gone $500 over original estimated material cost.
All these liberal laws has turned me into a right wingnut..