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Tool Talk Discussion Forum

Re: electrical question

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dr sportster

07-24-2013 18:43:43

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250.4 [A] [5] Electrical raceways,cables,enclosures equipment and other conductive material likely to become energized must be installed in a manner that creates a low -impedance path to facilitate the operation of the circuit overcurrent device or ground detector for high impedance systems Earth not an effective ground path Danger earth does not clear a ground fault. Grounding metal parts to earth does not assist in removing dangerous voltage from ground faults. Bonding electrically conductive materials to each other and to the SUPPLY SOURCE establishes an effective ground fault path.To quickly remove fault current ground path must have low impedence. NOTE comments not in NEC are by Joseph McPartland . I was taught all grounding is to be "targeted: to the main panel. myself.No rods at other buildings. Sorry for any typos too tired to proof read.

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John T

07-25-2013 05:44:14

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 Re: electrical question in reply to dr sportster, 07-24-2013 18:43:43  
Way back years ago I had the HONOR AND PLEASURE to attend an NEC Seminar taught by Joe McPartland. He and Mike Holt are about as good there was.

PS dont forget every buildings electrical service still requires grounding as I best recall, but its been too long for me grrrrrrrrr

As always, fun sparky chat

John T Toooo long retired EE

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