Cables mounting question. In a loft space

Chunkytfg · 26 Nov 2019

Our boiler and hot water tank is in the process of being moved up to the loft.

The Boiler circuit has been ran up to the loft already but not terminated as I was not 100% where the tank and boiler would end up located.

Now it's located on the gable end I know where I need to mount the various FCU's for the immersion and boiler supply.

I'm going to need to run the T+E up the wall to get to the boxes. Is it acceptable to clip the cable direct to the brickwork or do I have to run it in conduit, albeit plastic?

Chunkytfg · 26 Nov 2019

Ignore me! Having a brain fart!!

Trunking!!!

Notch7 · 26 Nov 2019

Clip it direct to wall

AndyPRK · 26 Nov 2019

You don’t want the immersion switch in the loft. !! Best get one with neon though

Chunkytfg · 26 Nov 2019

AndyPRK said:
You don’t want the immersion switch in the loft. !! Best get one with neon though

They are not in the loft. I've wired a couple of Neon 'Water Heater' 20A switches in the airing cupboard so the boiler has a FCU in the loft which will be fused down to 5A I think(need to check) and there will be a couple of flex outlet plates for the immersion heaters. When I typed the original post I couldn't remember the term 'flex outlet plate' so just typed FCU as it kind of was the same thing for the purpose of my post.

AndyPRK · 26 Nov 2019

3A fuse for boiler

Chunkytfg · 26 Nov 2019

AndyPRK said:
3A fuse for boiler

Thanks

winston1 · 26 Nov 2019

AndyPRK said:
3A fuse for boiler

Well it actually depends on the size of the cable feeding it (which is what the fuse is for). Think, in other countries the same boilers are on a 16 amp MCB, which is why, of course, boilers are internally fused.

AndyPRK · 27 Nov 2019

though if one follows manufactures instructions (maybe you aren't in that camp )
timer instructions state a 3A fuse should be used

A 3 amp fuse should be plenty

EFLImpudence · 27 Nov 2019

Why, then, do they not stipulate a 1A fuse?

What catastrophe would ensue were you to use a 5A fuse - or 13A?

AndyPRK · 27 Nov 2019

No catastrophe.

I use nails instead and allow the upstream devices to protect things

winston1 · 27 Nov 2019

EFLImpudence said:
Why, then, do they not stipulate a 1A fuse?

What catastrophe would ensue were you to use a 5A fuse - or 13A?

A 1 A fuse is not (readily) available, is not a preferred value, and would probably nuisance blow with pump start up surge.

No catastrophe with a 5 or 13A fuse, the same boilers are on a 16A circuit in Europe.

EFLImpudence · 27 Nov 2019

My questions were rhetorical, Winston.

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Cables mounting question. In a loft space

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