heating question

[vinny electric]

is it ok to wire a heating system with .75 flex as it is protected by a three amp fuse all answers welcome

 

[malcolmsanford]

Thanks Dunc this is what started it off really. I agree that technically someone could but a 3amp fuse in a boiler FCU in a garage while you were upstairs in the airing cupboard, though unlikely, technically it is possible, the same as someone might have a spare handle to an isolator on a commercial/industrial site.

As I asked originally is this 3 pole isolator not only a part of the heating regs, which I will honestly say I have little knowledge of, but also in most manufacters instructions?

Taking this further what would the situation be if at the boiler in the garage rather than having a FCU that can not be locked. you actually fitted a lockable isolator?, would in your opinion stll need this internal 3 pole isolation for the S/L, L and N if on a TT

 

[Dunc]

Taking this further what would the situation be if at the boiler in the garage rather than having a FCU that can not be locked. you actually fitted a lockable isolator?, would in your opinion stll need this internal 3 pole isolation for the S/L, L and N if on a TT

I would say the lockable isolator would satisfy our regs but the heating engineer would be having a right go at you. Ruddy plumbers! To be honest even if it wasn't for the other trades regs i would still fit an isolator beside the boiler as a matter of course in the interests of good practice.

 

[MiAmigo]

All very interseting reading.
I am currently re-wiring a flat- not being a member of a scam club yet I'm doing this through the local authority's building control. The new owner of the flat is also having a new boiler fitted but a GasSafe registered plumber is doing that. The original boiler was simply plugged into an adjacent switched socket outlet in the kitchen. British Gas initially quoted to replace the boiler and they insisted that a switched spur box was fitted as supplying the boiler from a socket outlet is no longer allowed "under the regs". Sounds reasonable to me. In order to get a better quote than the "arm and a leg" that British Gas wanted the owner has had three GasSafe registered plumbers to quote for the job and all three have said that it is perfectly ok to feed the boiler from a switched socket.

Like everyone else on this thread I have trawled through BS7671 and failed to find any regs regarding the electrical supply to a boiler. But British Gas are a professional outfit so if they say it is required then I'm inclined to think that is true.

Two questions I have are:

1. Is it ok to supply the boiler from a switched socket outlet or does it have to be done via a suitably labelled single/double pole switch and fuse situated adjacent to the boiler?
2. Is it ok to supply it from the radial final circuit to the kitchen or does it require a dedicated feed from the cu?

I could just do what the plumber is happy with but if the local authority's inspector fails it when he makes his inspection I'll only have to do it again.

Thanks in advance.

mia

 

[malcolmsanford]

As the discussion went on here for the BS 7671-2008 a boiler can be feed from a BS 1363 socket and plug.

As Dunc tells us the gas regs are a different entity in themselves by the looks of things