falling foul of 'maintenance free' derating

Thank you everybody !


@Farmboy - thanks for the attached info as well.


@Mapj - do you mean that its the BS std that 'forces' the derating or is it a manufacturer thing - because and do correct if needed, the Ashley-Hager j803 read as if they are better rated than the Wago/Ideal type approach (though I may be wrong again).  Moreover, imagine an MF approach of this type under a bare wood floor that leaves a screwed down 'hatch' (not quite but you get the idea). This would be reasonably 'accessible' and therefore can run at the full up current carrying capacity the manufacturer specs.  Later on (or as an alternative scenario from the outset), down goes some laminate or glued flooring making the setup reasonably considered 'inaccessible' but that's ok, 'you' used an MF approach...but oh wait, its maybe now 'not compliant' (bit severe assessment I know), in that suddenly one has to think about the [daft?] implication derating from the BS Std. and the manufacturer instructions for use !   To me its the same install situation considering environment factors and electrical stuff, same components etc. Hence my question, is the derating there just in case of worst scenario/leaving margins etc and to not allow judgement for scenarios as described (if my scenario holds water hehe )?


edit: missed a bit....  Or maybe it is because there is nervousness from whoever, about it being inaccessible so better have a safety margin just in case; it can run full up so long as you can get to it, but if you cant get to it, just in case, it has to be derated, (even though electrically it is fine).

Thank you everybody !


@Farmboy - thanks for the attached info as well.


@Mapj - do you mean that its the BS std that 'forces' the derating or is it a manufacturer thing - because and do correct if needed, the Ashley-Hager j803 read as if they are better rated than the Wago/Ideal type approach (though I may be wrong again).  Moreover, imagine an MF approach of this type under a bare wood floor that leaves a screwed down 'hatch' (not quite but you get the idea). This would be reasonably 'accessible' and therefore can run at the full up current carrying capacity the manufacturer specs.  Later on (or as an alternative scenario from the outset), down goes some laminate or glued flooring making the setup reasonably considered 'inaccessible' but that's ok, 'you' used an MF approach...but oh wait, its maybe now 'not compliant' (bit severe assessment I know), in that suddenly one has to think about the [daft?] implication derating from the BS Std. and the manufacturer instructions for use !   To me its the same install situation considering environment factors and electrical stuff, same components etc. Hence my question, is the derating there just in case of worst scenario/leaving margins etc and to not allow judgement for scenarios as described (if my scenario holds water hehe )?


edit: missed a bit....  Or maybe it is because there is nervousness from whoever, about it being inaccessible so better have a safety margin just in case; it can run full up so long as you can get to it, but if you cant get to it, just in case, it has to be derated, (even though electrically it is fine).