EGC and plastic plumbing pipe

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deepthreat

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Greetings to all, first time poster, long time "lurker". I hope someone can point me in the right direction. Where in art. 250 can I find regs regarding the bonding of the water pipe system with the EGC. if the pipe coming into the house is plastic and the rest of the water lines throughout the house are copper. The guy I work with always uses two ground rods with a #6 going to both, he says that fulfils the code requirement for the main system grounding, the length is fairly standard no matter where the water service meter is located , you don't waste money on a larger EGC to the water service, and you don't have to worry about what type of pipe is providing the water to the house. This all makes practical sense to me, however, my thinking is, shouldn't you still take a grounding conductor to the copper in the event a hot wire were to inadvertantly touch a pipe somewhere in the house. This may seem basic to more than a few of you, but is my thinking skewed or does this make sense? Thanks in advance for you consideration of this query
 
250.52 will give you your answers on water piping systems. Basicly the "metal" water piping entering the building is your first means and the ground rod is "suplimental". IF a metal water pipe is not entering the building then you can use a second ground rod. If the water pipe entering the building is plastic but then turns to copper for the interior piping system the that will need to be BONDED as per 250.104 so that it is at the same potential. 250.50 tells you what SHALL be used if present meaning if the water pipe entering the building is metal then you SHALL use it...you can't ignore it and just use 2 ground rods.
 
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