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18th edition question

Andrew W over 1 year ago

hi started to study for my 18th, wots you guys think the answer is, something tells me it’s different to wots on the answer sheet

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0 gkenyon over 1 year ago

I think D is a far more interesting conductor to tag a name on.

Any takers for a classification for conductor D in that diagram?
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0 mapj1 over 1 year ago in reply to gkenyon

I think D and A are the same conductor, namely the big CPC for the whole site - I'd not use any term with 'bond'' in the name. The fact it has a MET (Main or Marshalling Earth Terminal )part way along does not alter the primary function of being the thing the ADS in the consumer unit depends on - cut either and you cannot be sure that fuses blow any more.
The plumbing bonds could have joined at the CU end or at the incomer end and not alter that.
Equally I'd not say someone was wrong if they referred to either A or D as the "main earth" - just as long as they did no slip in the word 'bond', . not a question with clear cut 'always right' answer so rather a nasty one.

Mike.
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0 Stuart Urban over 1 year ago in reply to gkenyon

CPC
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0 gkenyon over 1 year ago in reply to mapj1

mapj1 Interesting, and I don't think I disagree - but are D and A the same in terms of BS 7671 definitions?

I'm not sure they are (unless you say you have two METs - but then which is actually the main one?
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0 gkenyon over 1 year ago in reply to mapj1

mapj1 Interesting, and I don't think I disagree - but are D and A the same in terms of BS 7671 definitions?

I'm not sure they are (unless you say you have two METs - but then which is actually the main one?
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