Andy Hall wrote:
>
>> Is this a TT environment, Grunff?
>>
>> The arrangements in a CU are different for this vs. the other methods >> of provision.
>
>Ah, ok, I didn't realise this would make a difference. I don't know yet,
>it's a friend's house, we're still at the planning stage.
>
>I have seen the current arrangement (a while back), and have a feeling
>it is TN-S, but I will check.
The *current* arrangement.... :-)
>I wouldn't mind an explanation of the different CU arrangements :-)
It's worth getting a copy of the IEE On-Site Guide for this. It has sections describing the different provisioning arrangements and how to organise a CU for each, as well as some overall system layouts. Whitfield's book (Electrician's Guide) is also helpful.
The main things are accounting for the provisioning arrangement and for various forms of diversity (i.e. not all loads on at once). If he has outbuildings etc. as well, then there are issues to cover there also.
.andy
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