Cable run under floorboards

[Iain123]

Hi Group

Had a third party inspection by a NAPIT tester, to get building control approval for a pv installation.
He has failed the cable run in Twin and Earth under my floorboards even though its greater than 50mm from surface. No 30ma RCD fitted to this circuit.

I though it was acceptable if the cable was 50mm or greater from the top of the joists?
Thanks for advice in advance

Iain

 

[Guest77]

Been in this game since 1979, and I can say never have, always drilled out timbers.

Same here, I have on the odd occassion used a plate, that has usually been when rewiring and there is slots from old central heating pipes available and it is a bit dangerous to drill further holes due to weakening the joists, otherwise I always drill everytime and thought everyone else did also.

 

[davesparks]

Same here, I have on the odd occassion used a plate, that has usually been when rewiring and there is slots from old central heating pipes available and it is a bit dangerous to drill further holes due to weakening the joists, otherwise I always drill everytime and thought everyone else did also.

As I said above, on extensions to listed buildings where traditional building styles are used and most of the joist remains exposed and just an inch of void above the ceiling panels you don't have anywhere to drill