On Mon, 5 Feb 2007 09:52:34 UTC, Lobster
wrote:

I need to connect up earth bonding conductors to my incoming gas and
water supplies, and have just checked Whitfield's "Electrician's Guide"
to double-check which side of the respective stop cocks to attach the
bonding.

For an all-copper system like mine, Whitfield shows the water pipe
earthed on the *street* side of the stopcock, whereas the gas pipe it is
on the *house* side of the stopcock (Fig 5.13). I'm assuming that's
correct but can't understand the logic behind it - before I unpack my
earth clamps please can someone explain?!

The OSG clearly states that "the connection to the gas, water, oil etc.
service should be within 600mm of the service meter, or at the point of
entry to the building if the service meter is external, and must be on
the consumer's side before any branch pipework...". Refers to 547-02-02
in the regs. The regs also say that if there is an insulating section at
that point, or a meter, the connection should be made to the consumer's
hard metal pipework. So, if there isn't a meter, have it as near to the
point of entry as possible, so that will determine which side of the
stopcock you choose. Perhaps that's what Whitfield is getting at.

(I have the blue versions of OSG and regs).
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