Compliant?

Thanks Andy,

                      the 1.0mm2 T&E is running on glass fibre flameproof insulation in a very clean and tidy environment with no rubbish or detritus near it at all. It does not run over any timber joists. I can not see any way that it can be damaged as it is under a tank stand and in an inaccessible area at the end of a loft. 

A fault can occur in many ways - not just physical damage to the cable. In your situation I'd still be worried about the wiring behind the FCU - a fault there will still expose the full length of the first 1mm² to excessive fault current/duration. I'm sure most of us have come across the results of faults behind sockets or FCUs at some time or other - either from basic insulation having been trapped and squashed, seemingly OK at first but eventually going bang perhaps decades later; or due to loose connection or internal flaw in the accessory causing overheating and melting the insulation. The wiring to the incomer of CUs etc is usually much better than BS 1363 type accessories in that respect as the individual conductors can be run separate from each other and there's no need to squash them all into the backbox after termination, so chances of a fault can be much reduced even if the basic insulation fails. You've certainly satisfied (i) and sounds like you're happy with (iii) as well - but it still sounds to me like you might have a problem with (ii) - and BS 7671 requires all three to be satisfied.


   - Andy.

Thanks Andy,

                      the 1.0mm2 T&E is running on glass fibre flameproof insulation in a very clean and tidy environment with no rubbish or detritus near it at all. It does not run over any timber joists. I can not see any way that it can be damaged as it is under a tank stand and in an inaccessible area at the end of a loft. 

A fault can occur in many ways - not just physical damage to the cable. In your situation I'd still be worried about the wiring behind the FCU - a fault there will still expose the full length of the first 1mm² to excessive fault current/duration. I'm sure most of us have come across the results of faults behind sockets or FCUs at some time or other - either from basic insulation having been trapped and squashed, seemingly OK at first but eventually going bang perhaps decades later; or due to loose connection or internal flaw in the accessory causing overheating and melting the insulation. The wiring to the incomer of CUs etc is usually much better than BS 1363 type accessories in that respect as the individual conductors can be run separate from each other and there's no need to squash them all into the backbox after termination, so chances of a fault can be much reduced even if the basic insulation fails. You've certainly satisfied (i) and sounds like you're happy with (iii) as well - but it still sounds to me like you might have a problem with (ii) - and BS 7671 requires all three to be satisfied.


   - Andy.