At least according to http://www.tlc-direct.co.uk/Book/4.3.8.htm they are recongnised but with a special requirement to derate cables fed from them which means circuits connected to them generally won't comply.The old school wylex and rewireable fuses where built to a british standard which is still recognised in the regulations.
But the fuse type doesn't make any difference to that installation.
It does on a 2.5/1.0 circuit
Yet most kit is installed on the (fireproof) backing board installed by the REC.As most of these old fuseboxes were mounted on plywood boards or other timber, this is clearly NOT a 'material which is non combustible'.
It does if you round to the nearest integer...The current carrying capacity for a 2.5 flat twin and earth clipped direct from table 4D5 is 27A before any correction, where a BS3036 is used the Iz for it will be 27x0.725 = 19.58A without applying any other correction factors therefore does not comply with 433.1.5
So is it right that such components are damned without checking whether or not they would pass the above tests? If you can do so, fair enough - but if you can't, how does that square off with your professional indemnity insurance and liability?
Because the regs are not rectroactive.
So the IEE asked the ERA to test flat T/E cable, and as if by magic the current ratings went up.
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