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Re: CQD answers published November 28 and December 10, 2019 -Water Piping Replacement
Electrode retrofitting replacement is not in the NEC that I know of, but since so many inspectors read this excellent CQD, I will offer up my solution for losing the metal main water supply line. It details Chuck Mello's mention of a 250.53(D)(2) supplemental electrode.
The replacement of the water supply line essentially always requires that a trench be dug. At this time it is very easy to install a supplemental electrode system [250.53(D)(2)]. Place a bare copper conductor in the trench with the new plastic pipe, with at least one but preferably two ground rods [250.52(5) & 250.53(A)(3) & 250.53(B)]. These rods are also driven in the trench, then use direct burial conductor clamps. This creates a "permanent" retrofitted electrode which is not easily damaged. Bare #6 copper would be allowed, but I used 25+ feet of #2, more in compliance with 250.52(A)(4) - an extra $20 cost - and put the rods 20' apart.
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