OlympusMons:Graham Warner:
it's quite possible (but impossible to check) that the water mains to each of the 3 buildings concerned might be in iron pipes.
you could do continuity tests on the pipes with a wander lead to check.
Quite so - but the impossibility lies in the elimination of all parallel paths in a safe manner, at least without shutting down the whole site, which is not feasible.
GW.
Quite so - but the impossibility lies in the elimination of all parallel paths in a safe manner, at least without shutting down the whole site, which is not feasible.
Yes, the CPC in a distribution circuit to another building must be at least as big as a MPBC, but does it ever need to be bigger than the earthing conductor of the whole installation?
but apparently with a contractual obligation that we continue to supply the juice to their changing room/showers/water treatment kit etc.
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