Trust the expert?

[JohnW2]

Well when you knock out the knockouts on the back of a board, you open up a huge hole, we're talking the equivelant of 3 or 4 20mm knockouts. Most of the time this is mostly backed by plasterboard and isn't as much of an issue. When you then cut out the plasterboard to the same size (or bigger) to bring you cables through) there is now a huge exit for flames to shoot out of, up and into your stud wall.

Quite so!

The LFB really ought to understand this, and have incorprated it into their advice/demands regarding BS7671. I'm sure no-one would be happy with 'fire doors/barriers' that were required to be made of 'non-combustible materials' but which were allowed to have big holes in them Whatever BS7671 may have decided to write (and not write) about this, IMO containment is always going to be at least as important as 'combustibility' in these sort of situations.

Kind Regards, John

 

[stillp]

Nice neat install.

I'd like to have a closer look at the metal work around those two stuffing glands before congratulating it....it might be... it might not be

I missed that! Must be too used to non-ferrous gland plates!

 

[Midas Man]

he said if it had the RCD would trip it.

Am I right in thinking it would trip only if it was overloaded, not if it was non compliant?

An RCD trips due to earth leakage, so either an imbalance on the live or neutral will cause it to trip. Nothing to do with overload, and so wouldn't trip if there was a spur off a spur off a spur off a spur off a spur etc

He's either not got a clue what he's talking about, or has realised you've caught him out not doing a proper job, and is trying to trick you into thinking he has

The last part of the paragraph is spot on, IMO!