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Re: A Historical Hudson Line Question

Posted by Jackson Park B Train on Mon May 14 01:32:17 2012, in response to Re: A Historical Hudson Line Question, posted by SelkirkTMO on Mon May 14 01:06:33 2012.

Funny you mention that mess. The NEC long ago required two grounding paths, an 8'rod + the cold water pipe if continuously metallicx and buried for at least 10' laterally, or a second 8' rod at least 6 away from the first one. Also the cold water clamp point must be within 5' of the entry to the building. Third issue. At the hot water heater, a bond min #8 linking the hot, cold, and gas piping. So first redundancy of connection into the dirt, second crosslinking of metallic piping, third cold water pipe clamp very close to where the water service comes in. I will tell you I violated the latter on the third floor of an SF building a decade and change ago. I was installing a light on the third (top) floor. In this building light fixtures are nechanically suspended from the no longer (we hope) active gas lighting. So, since in the flat roof "attic" accessible from the closet there was modern copper water piping, I metered that it was grounded and planted a clamp fishing a #10 over to the light. Clear violation of the letter--there was no ROW to the basement where a "legit" ground would be available. It metered true, I used it.

Not much rail content here, but this was right adjacent to the F Market Muni line.

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