Discuss Cable size in the UK Electrical Forum area at ElectriciansForums.net
WPD don't even record it, I have spoken to them about lost neutrals before and they say there is more chance of finding a needle in a haystack.
I think if I just disconnect the main earth and then take a wonder lead either from the MET to the steel or the steel bond and see what IR I get, if its above 23,000 ohms, then thats good is it not? and surely that confirms that its a good enough earth?
I think you'll find it'll be the other way round, ....if it's over 23K then the structure isn't considered extraneous. The betting is that you'll be very lucky indeed to find a steel structure such as you have, that won't be extraneous. I'm betting it'll at the most a low single figure!!
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