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Bonding industrial buildings

Sparky gaz

Bonding question 

Our main 2000a dis board is 150meters away from the main incoming water supply .. We presently have a 50mm bonding cable going to a 25mm water incoming supply is this acceptable?..

Also our gas is 15meters away from main dis board . presently has a 50mm bonding going the gas 5" incomer is this acceptable ? in 2016 it had a code C2 put on it during a eicr im about to do a new eicr and just wanted to check as struggling to find much in the regs book about gas about 28mm

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  • 0

    The metal cross section of a pipe in mm2 is a lot more than its diameter - even a  15mm water pipe is equivalent to about 30mm2, larger pipes of course  have more metal. What is the earthing arrangement of your supply ? - I'm imagining private TX TNC-S but just to confirm.

    The concern may be the current handling of the 50mm2 (good for 150A or so continuous and a few kA in short bursts) may be a bit thin for the potential fault currents that a 2000A supply can provide.? Is there an explanation for the previous C2 ?

    Mike

  • 0 in reply to mapj1

    TNC-S is very unlikely for such a large supply Mike, it is about 1.5MW!

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  • 0 in reply to mapj1

    TNC-S is very unlikely for such a large supply Mike, it is about 1.5MW!

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