Oil fired boiler supply...

[Guitarist]

I know that there are many views concerning this, but is it really worth running a separate supply to a boiler which needs a 3A SFCU anyway, or just come off the kitchen RFC?
I normally do on MCB setups, but with a full Crabtree RCBO board, the inconvenience factor is already very low.
Would appreciate your views.

 

[Silly Sausage]

No.

I rewired about 7 or 8 years ago at home, spur off the RCDed K ring to a 3A FCU, never had a problem.
Apart from once when the lovely one left the cord of the sandwich toaster between the plates with out turning it off.

 

[StuSpiers]

No.

I rewired about 7 or 8 years ago at home, spur off the RCDed K ring to a 3A FCU, never had a problem.
Apart from once when the lovely one left the cord of the sandwich toaster between the plates with out turning it off.

Classic!

 

[Silly Sausage]

Just noticed it's Oil burners, same difference.
Our heating usually gets cut off because we can't feed the gas meter.

 

[imago]

This is the third house I've lived in with a combi-boiler fitted over a twenty year period. All three have been fused spurs from a ring with RCD/MCB protection. I have never had the boiler shut down due to a trip caused by something else.

So as far as I'm concerned a fused spur is a perfectly acceptable method, and running in a separte dedicated feed is overkill. I'd go further and say that it's a similar situation to smoke alarms where it's better on a shared circuit as the trip is discovered much more quickly because something instantly noticeable has happed when the circuit trips.

Obviously there are circumstances where this wouldn't be acceptable, but they are the exception rather than the rule IMHO.

 

[Guitarist]

As I say, the kitchen RFC will be on its own RCBO anyway, so it would only be this circuit which could kill the boiler, and if that happened, it would need sorting very quickly anyway.
Thanks for the replies

 

[telectrix]

it would need sorting very quickly anyway.


too true. can't have her indoors slobbing it in front of the telly whilst there's dinner to cook. :rockon:

 

[wildgoose]

Think the logic is this:-

If they have previously had a hot water tank system and then converted to a Combi boiler, then use the now redundant immersion heater circuit for the combi - via an FCU.

If not, then get the power from a convenient RFC point!!!

 

[oldtimer]

I think it is Urban Myth time if you have a 10 or 12 way boards with spares ways then yes but remember most houses have a 6 way DB so thing like CH,Burglar alarm,smoke detector,or oil burner then you spur it off

 

[Guitarist]

Think the logic is this:-

If they have previously had a hot water tank system and then converted to a Combi boiler, then use the now redundant immersion heater circuit for the combi - via an FCU.

If not, then get the power from a convenient RFC point!!!

Complete rewire from scratch, so nothing there at all. I'm obviously reducing the "inconvenience factor" immensely by using a full RCBO board. Giving the electric oven (13 amps required) its own circuit, but as the boiler takes very little power there doesn't seem much point buying another RCBO and running a supply out for what is probably less than an amp.

 

[oldtimer]

Complete rewire from scratch, so nothing there at all. I'm obviously reducing the "inconvenience factor" immensely by using a full RCBO board. Giving the electric oven (13 amps required) its own circuit, but as the boiler takes very little power there doesn't seem much point buying another RCBO and running a supply out for what is probably less than an amp.

ok if you are doing this then remember to use a DP FCU because if there is a problem in the future you can isolate it without comprimising the rest of the circuit on the rcbo

 

[Guitarist]

ok if you are doing this then remember to use a DP FCU because if there is a problem in the future you can isolate it without comprimising the rest of the circuit on the rcbo

I always use DP units mate. In fact, that is all that's been available for many a year now
Thanks for advice tho.

 

[drew35]

I thought it was 5 amp for oil fired? Its what the manufacturers instructions usually state.

 

[Guitarist]

I thought it was 5 amp for oil fired? Its what the manufacturers instructions usually state.

Most will take much less than even 3A. Manufacturers often state a maximum fuse rating, but obviously if the ones you have installed state 5A then all well and good