• Looking for a smarter way to manage your heating this winter? We’ve been testing the new Aqara Radiator Thermostat W600 to see how quiet, accurate and easy it is to use around the home. Click here read our review.

Spurring electrics for conservatory

Joined
15 Apr 2012
Messages
3
Reaction score
0
Location
Bristol
Country
United Kingdom
Hi new member here, first post so please be easy on me!

I have recently had a new conservatory built by a reputable company that came highly recommended in the area. I have been very happy with the work done, at least as far as the building and plastering goes. But have some slight concerns about the electrics after doing some reading up on Part P and now wonder how best to proceed.

When we first agreed to the work it was explained that as they do not have an electrician with the necessary credentials to certify the work they could only run the cabling and boxes around the new room and up to the nearest socket leaving it for me (or a qualified electrician) to fit the sockets and hook up to the ring main via the existing socket.

Having converted several single sockets to doubles in the past and spurred a new single socket elsewhere in the house, this seemed like a reasonable thing to do at the time. But having done some research on the matter it seems that the configuration I have been left with is less than ideal and would not comply with part P if I was to attempt to have electrics certified at a later date.

The new room has 3 sockets (2 doubles and a single) in a loop of 2.5mm along with a switched FCU for a light fitting running 1.5mm to a dimmer switch and then to the fitting. The 2.5mm loop runs out into an adjacent room (the dining room) up to a single socket (which is rarely if ever used) . My understanding is that this setup will not comply with Part P regs as spurring more than 1 single socket from an existing ring final circuit socket is not permitted unless protected by an FCU. I believe that ideally the new circuit should have been created by extending from two sockets in order to maintain the RFC integrity and keep the load balanced across the system.

I have 2 questions, firstly based on what I have described, I am correct in my assessment or is this a perfectly normal setup to effectivley spur a loop of of the ring main socket?
Secondly given the current setup, how should I proceed? Is there any reason why I should not simply convert the single dining room socket to an 13 amp FCU to supply the new conservatory circuit? We plan to run a LCD TV + Sky Box and a few low power lights. Easily below 13amps by my estimations.
 
The new room has 3 sockets (2 doubles and a single) in a loop of 2.5mm along with a switched FCU for a light fitting running 1.5mm to a dimmer switch and then to the fitting. The 2.5mm loop runs out into an adjacent room (the dining room) up to a single socket (which is rarely if ever used) . My understanding is that this setup will not comply with Part P regs as spurring more than 1 single socket from an existing ring final circuit socket is not permitted unless protected by an FCU.

Correct

I believe that ideally the new circuit should have been created by extending from two sockets in order to maintain the RFC integrity and keep the load balanced across the system.

subject to the RFC still being within the floor area recommendation and suitable for the anticipated load

Secondly given the current setup, how should I proceed? Is there any reason why I should not simply convert the single dining room socket to an 13 amp FCU to supply the new conservatory circuit? We plan to run a LCD TV + Sky Box and a few low power lights. Easily below 13amps by my estimations.

That would seem to be sensible. If the RFC isn't protected by RCD use an RCD-FCU to provide RCD protection to the new cables and sockets.
 
How many cables are behind that "rarely used " single socket?

If it is not a spur then my inclination would be to remove the socket and connect the new cables there, thus extending the ring final into the conservatory. Then put a blank plate on it and forget about the rarely used socket.

Per the above, an RCD will be required if not already protecting that circuit.
 
When we first agreed to the work it was explained that as they do not have an electrician with the necessary credentials to certify the work they could only run the cabling and boxes around the new room and up to the nearest socket leaving it for me (or a qualified electrician) to fit the sockets and hook up to the ring main via the existing socket.
The Building Regulations were extended to cover electrical work over 7 years age.

I'd question the professionalism of a company which still can't work to them after all that time.
 
Normal procedure would be for the conny company to use a local self employed spark to do the work
 
How many cables are behind that "rarely used " single socket?

If it is not a spur then my inclination would be to remove the socket and connect the new cables there, thus extending the ring final into the conservatory. Then put a blank plate on it and forget about the rarely used socket.

Per the above, an RCD will be required if not already protecting that circuit.

I did wonder if that would be an option. The rarely used socket has now been successfully converted to a FCU (RCD provided by consumer unit) which seems to be coping fine with the load for now.
But if at a later date I can effectively extend the ring behind the socket then I may consider doing that if it is an acceptable option. What should I use to connect the cables? A 30A terminal block with 6 terminals?
 
3 terminals. Pull one of the two existing ring cables out the socket terms, connect one of the cables for the consv to the socket, then connect the remaining cables together.
 
3 terminals. Pull one of the two existing ring cables out the socket terms, connect one of the cables for the consv to the socket, then connect the remaining cables together.

Ah I see, that's if I leave the socket in place rather than as Taylortwocities suggests and use a blanking plate. This seems like a great option, and possibly what the installers intended as it leaves the existing socket in service. Is there any issue with this approach? As far as I can work out, this is effectively extending the ring without breaking into two sockets. Whats the issue with it? Presumably just the potential to exceed the 32A of the RFC?
 
There's no issue.
The circuit is protected by the 32A MCB in the consumer unit.
There's a notional limit on floor space served by a single ring of 100m².

The only iss ue is usually a practical one of having a socket and connecting two cables in the same back box.

If there's space you can do it, and still keep that single socket.
 

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.


Are you a trade or supplier? You can create your listing free at DIYnot Local

 
Back
Top