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Hi,

My existing system boiler if fed via a fused connection unit off the ring final circuit, when the boiler is replaced is it a requirement/best practice, that the boiler is fed via a dedicated circuit from the consumer unit to the fused connection unit.

Cheers

Ian
 
its fine off the ring/ as it its
 
Hi,

My existing system boiler if fed via a fused connection unit off the ring final circuit, when the boiler is replaced is it a requirement/best practice, that the boiler is fed via a dedicated circuit from the consumer unit to the fused connection unit.

Cheers

Ian

Contributing as spark .............. no

Why do you ask
 
Leaving it on the ring circuit is not "Best Practice". A dedictated circuit is.

Thanks to the forum I now know is not an 'electrical' requirement, is the dedicated circuit preferred by plumbing professional trade bodies as best practice
 
Nope aslong as there's a fused spur it doesn't matter a feed could even be taken off the lighting circuit if acceptable (loading etc)
 
If you are having an electric boiler fitted, yes a dedicated circuit would be required ...but for a gas boiler absolutely not a requirement.

I may be wrong but an elec boiler rated at 3kw should be fine ?
 
Hum.... I wouldn't, sure if it had a 13A plug on it but anything with a load above 2 Kw should be on its own circuit

would a fcu be acceptable ? just thinking of those 3kw wall/panel heaters
 
Thanks guys for the clarity, in my case it is a gas fuelled system boiler, electrically everything is fine, so I’ll leave it as is, I just didn’t want to fall foul if some other requirement I wasn’t aware of that I could sort in advance.
 
A dedicated supply to a piece of equipment you do not want disturbed by tripping from faults by other electrical items or that requires more sensitive RCD’s or different protection to that provided in a standard CU.

thats ok if the system is rcbo but if its on a split board half of its going off when the rcd trips any way
 
A dedicated supply to a piece of equipment you do not want disturbed by tripping from faults by other electrical items or that requires more sensitive RCD’s or different protection to that provided in a standard CU.

There are no regulations that state this ....

But there are regulations about spurs off spurs, which plumbers tend to ignore.
 
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There are no regulations that state this ..

But there are regulations about spurs off spurs, which plumbers tend to ignore.

Vee- you can disagree with me you like, but please offer up a BS 7671 reg number to back up your position
 
You are missing the point as this is not about regulations, but what is correct for a particular scenario. You are generalising for a boiler.
 
You are missing the point as this is not about regulations, but what is correct for a particular scenario. You are generalising for a boiler.

Err no.

I am offering a direct answer to the op.

His question was do I need a dedicated fused spur for a new gas boiler.

The answer is no.
 
There are no regulations that state this ..

But there are regulations about spurs off spurs, which plumbers tend to ignore.
Equally electricans often fail to understand controls.
Err no.

I am offering a direct answer to the op.

His question was do I need a dedicated fused spur for a new gas boiler.

The answer is no.
He asked about Best Practice, not just the minimum requirement under the Regs. Surely that can differ?
 
A dedicated supply to a piece of equipment you do not want disturbed by tripping from faults by other electrical items or that requires more sensitive RCD’s or different protection to that provided in a standard CU.
Murdock - You surely understand what I am saying her and if you where so up on your Regs you would not disagree with this. Have we touched a nerve?
 
Not touched a nerve ... Just making sure an unsuspecting client isn't badly advised by a plumber, regarding electrical regulations.

It's that simple.
 
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Not touched a nerve . Just making sure an unsuspecting client isn't badly advised by a plumber, regarding electrical regulations.

It's that simple.
What makes you think you are the only electrician on here?
 
I am an electrician and install boilers.. lol
No requirement as Murdoch says but if it was my house, it was easy, and i had a RCBO board, then definitly i would give it a dedicated cct.
Boilers often have zone valves, boilers also often leak, when i am fault finding a tripping RCD, boilers like outside lights and outside sockets are well up there as potential culprits. Having a dedicated cct just makes it easier to find and reduce the nuisance factor
 
Personally, I would like to see the boiler on a dedicated RCBO, if it were a new installation in my own house.

I have lived in places where trivial faults on a heating system (normally a room stat, weirdly) have tended to trip the RCD, and it nice to be able to pinpoint the cause more easily. That said, where I live at present, the fused spur is off the ring main and it has not caused any trouble in the last two years and I have no intention of having a new circuit installed at the present moment.

Thinking to the last time I read the electrical regulations (not that I am an electrician), I think there was some point made about the advisability of designing a system to avoid nuisance tripping, but I think this was to be interpreted by the designer of the installation. As you are not installing an entire new electrical system, I doubt you would be expected to have a dedicated circuit for a replacement gas boiler, but I expect some people will disagree: if there's one thing I have learnt about electricians, it is that no two will agree on everything.
 
I don't, but I'd hazard a guess that if it's for a whole house the heat requirement is well above 3kW :)
I appreciate your logic and your quite right I would guess a whole house is above 3Kw. A jobwe did recently did surprise myself I had to double check my calcs.
A barn conversion with heat pump in mind from the beginning. The total heat loss for 3 bed, 2 en-suite, lounge dinner, large kitchen etc. etc. was just 4.2 Kw. It cost a few quid and there was plenty of non standard work but shows things can be done very well when the money is there. Sorry to hijack the post
 
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