Published:
1 October 2014
Category:
Q&A
John asks this question, which is about the limitations on a domestic electrical installation certificate concerning the characteristics of the primary supply overcurrent protective devices being unknown. It has been answered by the Electrical Contractors Association (Regulations and Legislation):
This Q & A is one of thousands posted in our Technical Expertise area, and answered on a daily basis by our Voltimum Experts.
Question: Based upon BS 7671: 2008, domestic electrical installation certificates are not to have any limitations on them.
So, with that said, finding out the characteristics of the primary supply overcurrent protective devices are not always achievable because of the main service cut out being sealed.
If no access is achievable, when only installing a single circuit, is it not unreasonable to ask the standard electrician to do this without involving the DNO or other operator, to re-seal once the fuse has been identified?
And is it wrong to assume what the actual fuse rating is, based upon the Series 7 cutout saying there is a 100A 1361 Type II fuse in it?
Answer: When adding a new circuit to an existing installation, if there is no information available, and after enquiring, the rating of the main fuse remains unknown, it should be noted on the certificate that the rating of the fuse carrier is X, but the size of the main fuse could not be determined.
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