TP Fan Isolator in Shower Room

[Midwest]

Went to look at a job yesterday, shower room refurbishment. I'm just replacing the existing main light, vanity mirror and dual fuel towel rad. No RCD protection on lighting, but as I'm just replacing what's there, I consider that just maintenance.

There is also an extractor fan, located outside just outside zone 2 (appears suitable for outside zones). Unusually, the TP isolator (plate switch) is located next to fan (I normally install isolator outside bathroom). I'm only removing fan & isolator, so the wall can be tiled, then re-fix. I've checked OSG, and plate switches can be installed in bathrooms outside zones, but still not 100% happy. Thoughts?

 

[Midwest]

PS; I 've seen several threads debating such, where in the case of a short circuit, it's odds & evens as to which would go first, whereas in the case of an overload, the 3a 1362 would go first. Now I'm not clever enough to say if that's correct or not?

Let the debate begin.

 

[DPG]

Be an interesting test to do. I would put a fiver on the 6A mcb tripping before the 3A cartridge fuse blew though.

 

[Octopus]

Just try and buy fans which don't need 3A fuses....

 

[Wilko]

Previous fun tests with workshop B32 rfc and s/c at plug ( ) resulted in both fuse melt and mcb trip for 13A and 5A fuses, but 3A fuse blew fast enough to discriminate and B32 mcb didn't trip. Actual results may vary, sample size 1 ...

 

[Midwest]

As I said, too technical for me. I might not be Mr Skelton best'est buddie, but he gave good reasoning here; Fuse size? - http://www.electriciansforums.co.uk/threads/fuse-size.64317/ (# 11), along with a differing view by Engineer 54.

 

[DPG]

Emg54 - blimey what happened to him? Lol. Lol. !!!!

 

[Midwest]

Emg54 - blimey what happened to him? Lol. Lol. !!!!

Last seen somewhere in China.

 

[Lagentium]

The 3A fuse rating got snagged on an NIC inspection a few years ago, when wiring new builds now we always wire the bathroom lighting on its own circuit protected by a 3A MCB, I'm sure that I've seen an isolator with a fuse carrier hat someone manufactures though.

 

[DPG]

There is a multipole isolator with a 3A fuse carrier built in yes.

 

[Midwest]

Click Scholmore; Excel 3 Pole Fused Fan Isolator Switch - White | QVS Electrical Wholesalers - http://www.qvsdirect.com/excel-3-pole-fused-fan-isolator-switch-white

Wished I'd got the patent

 

[DPG]

Yeah they were on the ball whoever thought of it.

 

[Deleted member 9648]

Last seen somewhere in China.

Best place for him........(I do miss those TT and neutral in switches keyboard scraps though)

The 3A fuse rating got snagged on an NIC inspection a few years ago, when wiring new builds now we always wire the bathroom lighting on its own circuit protected by a 3A MCB, I'm sure that I've seen an isolator with a fuse carrier hat someone manufactures though.

I wonder if it ever went up in smoke you'd be in trouble cos it states 'fuse' not mcb!

 

[Des 56]

It could be that he was taken ill ( hence his sudden disappearance from forums)

I hope I am wrong,he was a excellent member with great knowledge,he could be a little abrasive on occasion but he has been a big loss to this forum

 

[marc8]

Does anyone actually fit a switched spur at fan,I doubt it

We use certain manufacturers fan on jobs & insists on 3amp fuse in destructions, spoke with them about it they will invalidate any claims if it is not installed correctly.
Have been using another brand for continuous running if this fed from 6A light circuit it is fine in the instructions.
We sometimes run a bathroom & ensuite from 3 C/B on the board or if we have quite a few rooms with fans use 6amp C/B in board & sit a grid switch above with a bank 3 amp fuse units mainly if large house & the D/B is in a cupboard.

 

[Midwest]

I've replaced a few fans, which have either been jammed up with bird nesting materials, or like the last one, a wasp nest. None had had a local 3amp fusing, and as far as the owners were concerned, had caused the circuit mcb to trip. None had started a fire, or had signs of thermal damage.

That said, if the instructions say fit a 3amp fuse, that's what I'll do.