hello after a bit of info, looking to split 1 socket into 2, now i know that you cant have a spur from a spur, so is this diagram the correct way of doing this by using the JB, the JB at bottom is to extend the length of a cable
splitting a socket
- Thread starter 0000dave0000
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These junction boxes.
Where are they located, and what type are they?
Where are they located, and what type are they?
maintenance free ashley ones be going onto the floor joists mate
Is this a ring circuit or a radial circuit?
If it's a ring, then the top JB has two double outlets spurred off the ring at the same point, which is not good practice.
If it's a ring, then the top JB has two double outlets spurred off the ring at the same point, which is not good practice.
Yeh a ring circuit, only problem is its very awkward to run a spur from another room
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Is it possible to fit a fused connection unit (FCU)? If so likely best method for DIY for a number of reasons.
1 - No hidden junction boxed.
2 - Unlikely to have a problem with the loop impedance.
3 - If RCD not already included you can use a RCD FCU so all new wiring is RCD protected.
4 - Add as many sockets as you like daisy chained from a FCU.
The disadvantage is total for all sockets is 13A running washing machine, tumble drier, dishwasher, kettle would be a problem. But items like TV, Video, Router would be no problem and worst would be a blown fuse.
Any new wiring buried less than 50 mm needs RCD protection and nearly all 13A sockets need RCD protection.
1 - No hidden junction boxed.
2 - Unlikely to have a problem with the loop impedance.
3 - If RCD not already included you can use a RCD FCU so all new wiring is RCD protected.
4 - Add as many sockets as you like daisy chained from a FCU.
The disadvantage is total for all sockets is 13A running washing machine, tumble drier, dishwasher, kettle would be a problem. But items like TV, Video, Router would be no problem and worst would be a blown fuse.
Any new wiring buried less than 50 mm needs RCD protection and nearly all 13A sockets need RCD protection.
It's the bedroom anyway so wouldn't be any major appliances from it, the socket is in the middle of the two at top moved along the wall a bit
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Before extending a ring circuit one should measure the loop impedance to see if by doing so the limits would be exceeded both for volt drop and for tripping the magnetic part of the MCB.
In real life few DIY people have the instruments or the know how to calculate to be able to measure the loop impedance. The requirements for a 13A fuse is 2.42 ohms against a B32 MCB at 1.44 ohms so it is unlikely that any spurs taken from a FCU will exceed 0.98 ohms so although for electricians we would extend the ring for the DIY guy in the main he is better replacing a socket with a FCU then taking all new sockets from that. If necessary using a twin socket box so the first socket from the spur is next to the FCU.
Even if the 2.42 ohms is exceeded it will only add a little onto the trip time where as with the MCB exceeding the magnetic limit will mean the thermal part of the trip is the only protection which will mean quite a jump in the tripping time even if only just over the limit.
So unless able to measure the loop impedance then the FCU is the safer way to proceed. OK I know we should always measure the loop impedance but I would say that's very rare with DIY jobs.
In real life few DIY people have the instruments or the know how to calculate to be able to measure the loop impedance. The requirements for a 13A fuse is 2.42 ohms against a B32 MCB at 1.44 ohms so it is unlikely that any spurs taken from a FCU will exceed 0.98 ohms so although for electricians we would extend the ring for the DIY guy in the main he is better replacing a socket with a FCU then taking all new sockets from that. If necessary using a twin socket box so the first socket from the spur is next to the FCU.
Even if the 2.42 ohms is exceeded it will only add a little onto the trip time where as with the MCB exceeding the magnetic limit will mean the thermal part of the trip is the only protection which will mean quite a jump in the tripping time even if only just over the limit.
So unless able to measure the loop impedance then the FCU is the safer way to proceed. OK I know we should always measure the loop impedance but I would say that's very rare with DIY jobs.
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Look at these
to start with. You can mount a FCU and single socket where the orignal socket is then take all new sockets from that daisy chaining as many sockets as you want.
If you're under the floor with cables and JBs anyway, why not extend the ring?
Never heard of a 3 kW fan heater heating a chilly bedroom while waiting for the central heating to come on.
can this be done in this room as the rest of rooms are plastered and painted so dont want to disturb them, could someone modify my picture to show how to go about this? Thanks
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could you show us what your current setup is?
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