CSA of main earthing conductor for TT

Grumpy over 4 years ago

Morning! Has the minimum CSA of the main earth to the rod changed in the 18th ed? I can't find any reference to it in the BBB (except when buried).

I have a guy who is insisting on 16mm whereas I "thought" it could be much less if not buried and protected against corrosion and mechanical damage. I only have table 4.4(ii) in my 17th ed OSG as corroboration. Thanks.

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0 Grumpy over 4 years ago

Thanks both. So, are we saying that if you can't do the sums then you have to use 16mm? There isn't a definitive statement in the BBB like there was in the OSG?

Mind you he only "presumed" the main earth was 6mm instead of 16mm so am I to assume he couldn't find one? Surely that might have been worthy of a comment, as might the presence of three electric showers, disconnection times of 0.4 and 5 seconds . . . I'm beginning to wonder if I've wasted my dollar!!
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0 Grumpy over 4 years ago

Thanks both. So, are we saying that if you can't do the sums then you have to use 16mm? There isn't a definitive statement in the BBB like there was in the OSG?

Mind you he only "presumed" the main earth was 6mm instead of 16mm so am I to assume he couldn't find one? Surely that might have been worthy of a comment, as might the presence of three electric showers, disconnection times of 0.4 and 5 seconds . . . I'm beginning to wonder if I've wasted my dollar!!
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CSA of main earthing conductor for TT

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