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FCU Wiring/Spur
- Thread starter S_J898
- Start date
Were you given any certificates for this work?
Spuring off a spur is not an approved way of doing this
Spuring off a spur is not an approved way of doing this
@pete01 - Could you elaborate what you mean by 'maybe the boiler fcu is off the load side of the new fcu'? From what I recall, initially no new FCU was installed so perhaps the feed to the shed was taken directly from the existing boiler 3A FCU, but then few days later I saw next to the boiler FCU another FCU installed. I took the fuse out and saw 13. The boiler one was 3.
@Murdochcat - One online video states that if you add an FCU then you could connect many sockets after that. Is FCU not another socket?
That all depends on how its connected together
If you turn off the first FCU does it turn off the boiler?
@Murdochcat -
Perhaps my diagram didn’t explain properly.
Existing layout:
A wire 2.5mm is spurred from one of the kitchen sockets (in a ring) to an FCU used by the boiler (3A). So, if you turn of that FCU then yes, the boiler will turn off.
But in the new way laid out, I believe the spurred 2.5mm coming from the kitchen socket is now connected to a 13A FCU. The wiring behind that FCU shows one grey 2.5mm coming in from the kitchen socket, one grey 2.5mm going out to the boiler FCU which is 3A and one white 3 core flex going into the shed. So, if the 13A FCU is switched off then I believe everything will be off, the boiler and shed supply.
Perhaps my diagram didn’t explain properly.
Existing layout:
A wire 2.5mm is spurred from one of the kitchen sockets (in a ring) to an FCU used by the boiler (3A). So, if you turn of that FCU then yes, the boiler will turn off.
But in the new way laid out, I believe the spurred 2.5mm coming from the kitchen socket is now connected to a 13A FCU. The wiring behind that FCU shows one grey 2.5mm coming in from the kitchen socket, one grey 2.5mm going out to the boiler FCU which is 3A and one white 3 core flex going into the shed. So, if the 13A FCU is switched off then I believe everything will be off, the boiler and shed supply.
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The first fcu needs to turn off everything after it.
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That sounds ok then.
Just remember you only have 13 amps to play with whilst using the shed socket.
@pete01 - The shed only has a toilet, saniflo (which requires electic), one light and extractor fan. As mentioned before, the builder initially took the supply directly from the 3A Boiler FCU…but when saniflo was added, perhaps saniflo requires more electric so perhaps why he installed 13A FCU next to the boiler FCU 3A. Is 13A FCU required for this set up…or is it just something extra to be safe?
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Hope the flex is rated to 13A.
It’s not ideal because overload from the “outside” would blow the fuse that also supplies the boiler
@securespark - do you mean that white cable going to the shed? its quite thick. I need to check the rating of the wire.
@Murdochcat - as long as its allowed?
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