I have posted a piece here which is also on the TT topic, but is more general and I think a new thread would be better. Your voice is heard. See below.
The size of the main fuse up to 100A has always been considered safe and satisfactory for CUs, and there is no evidence that it is not. These new regulations in the 18th (which slipped in as UK only) have very far-reaching consequences ...
David,
All consumer units stated as suitable for 100 A supplies in the UK (called CDB's - customer distribution boards - in the standard) should comply with Annex ZB of BS EN 61439-3, which contains the requirement for testing from the 100 A BS 88-3 supply fuse, with fault currents of 16 kA, in this arrangement.
So I think that's covered (and also the use of 6 kA rated mcb's and RCBOs in these CUs), as the national test covers this?
Regarding the question about "maintenance replacements", Regulation 536.4.203 effectively says use the manufacturer's recommended products, or you take responsibility (of course, how could a manufacturer of a consumer unit vouch for another manufacturer's testing)?
The size of the main fuse up to 100A has always been considered safe and satisfactory for CUs, and there is no evidence that it is not. These new regulations in the 18th (which slipped in as UK only) have very far-reaching consequences ...
David,
All consumer units stated as suitable for 100 A supplies in the UK (called CDB's - customer distribution boards - in the standard) should comply with Annex ZB of BS EN 61439-3, which contains the requirement for testing from the 100 A BS 88-3 supply fuse, with fault currents of 16 kA, in this arrangement.
So I think that's covered (and also the use of 6 kA rated mcb's and RCBOs in these CUs), as the national test covers this?
Regarding the question about "maintenance replacements", Regulation 536.4.203 effectively says use the manufacturer's recommended products, or you take responsibility (of course, how could a manufacturer of a consumer unit vouch for another manufacturer's testing)?
