Boiler Supply Q
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Electric boiler, or gas boiler?
Usually just a 3A fused plug or switch from whatever supply is convenient.
There may be discussions to follow about earth bonding if using a plug.
However 2 points:
If unplugged (so no power on boiler) there is no need for the boiler to be earthed, and
If the gas pipe is correctly bonded at the meter (or other point of entry to building) the boiler is earthed.
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Not an electrician, but there isn't a need for a dedicated circuit.
Although, there is usually an FCU that can be a single point of isolation for the boiler and its associated controls.
The RGI's don't seem to like boilers with plugs!
Although, there is usually an FCU that can be a single point of isolation for the boiler and its associated controls.
The RGI's don't seem to like boilers with plugs!
D
Deleted member 267285
Where is the boiler located (or going to be located if not installed already)?
Ideal.
The fused connexion unit (FCU) can get it's supply from any power circuit.
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Note some boilers have a requirement for a type A RCD, not a clue why,
but I would assume some think in the boiler can allow DC to be injected, but since I do not work inside a boiler all I know is what the instructions say.
but I would assume some think in the boiler can allow DC to be injected, but since I do not work inside a boiler all I know is what the instructions say.
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This could be for TT supplies only, where you rely on the RCD, or it could be talking about general under 50 mm deep and use of sockets etc. It would be nice if it did say why.
Personally all my RCBO's are type AC and the supply is TN-C-S so the RCD protection is secondary protection, so not worried about changing all the RCBO's I read the packet when they were fitted which said type B it was not until latter I noted the logo.
However the point is if the instructions say type A and some one comes to fit boiler and says sorry you have wrong type of RCD can't connect it, one could not say he was wrong. One may feel he is being pedantic, but that does not make him wrong wanting type A protection.
So - nothing to do with a boiler, then.
The regulations do not require RCD protection for any appliance.
The regulations do not require RCD protection for any appliance.
In my (limited) experience, they still think the instructions require an FCU and no other option.The RGI's don't seem to like boilers with plugs!
When mother's boiler was changed not long ago, they removed a new(ish) socket and fitted an FCU. Luckily I spotted it before they left and asked them to put the socket back - which they weren't keen to do since "the instructions say you must use an FCU". I checked, they don't - just offer an FCU as a means of satisfying the need for a means of isolation.
They were even more annoyed when they realised that the cable they'd fitted was only just long enough once required to use plug/socket instead of top entry into the FCU.
In hindsight, I should have asked for the minor works certificate for the work on the house electrics. That would have been interesting since they had no test gear in evidence, and probably no idea how to use it if they had.
And I doubt qualified to issue such certificate.
Personally I'm finding a 13A plug is quite common on new boiler installations.
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