Discuss Spurring from MCB in the Commercial Electrical Advice area at ElectriciansForums.net

D

DonaldJ

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Evening all,

Not too good at being brief but I'll try my best.

CU with 4 ways. One for ring final, one for cooker, one for immersion (which no longer exists so this is now a radial and incorporates the boiler) and one for lights (both upstairs and down).

Spur from the lighting circuit 5a breaker in 1.5mm for about a foot then connected with terminal block to 6mm cable feeding a single socket. This obviously needs to be changed.

Spur from ring final 30a breaker in 2.5mm cable feeding three sockets and a further light under the stairs, not connected via a fused spur.

Spur from 40a breaker in 2.5mm cable feeding 6 sockets in the conservatory.

Truly bizarre.

Question is, how many spurs can you have off a single MCB? I'm thinking it wuold be much better to change the cable feeding the single socket to 2.5mm and moving to the 30a MCB and then taking the current spur connected to the 30a MCB from this single socket. There would be a 13a fused connection between breaker and the first socket on the run.

For the conservatory spur (well, radia really!) I was thinking of also adding this to the ring final MCB, again with a FCU between MCB and the first socket.

How does this sound as a temporary until the CU can be changed? Are you allowed two spurs from one MCB? It's the safest option I can think of for now.

The entire installation is protected by a 30ma RCD between meter and CU.

Cheers folks

Don.
 
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S

Shakey

  • Thread Starter Thread Starter
  • #2
Evening all,

Not too good at being brief but I'll try my best.

CU with 4 ways. One for ring final, one for cooker, one for immersion (which no longer exists so this is now a radial and incorporates the boiler) and one for lights (both upstairs and down).

Spur from the lighting circuit 5a breaker in 1.5mm for about a foot then connected with terminal block to 6mm cable feeding a single socket. This obviously needs to be changed.

Spur from ring final 30a breaker in 2.5mm cable feeding three sockets and a further light under the stairs, not connected via a fused spur.

Spur from 40a breaker in 2.5mm cable feeding 6 sockets in the conservatory.

Truly bizarre.

Question is, how many spurs can you have off a single MCB? I'm thinking it wuold be much better to change the cable feeding the single socket to 2.5mm and moving to the 30a MCB and then taking the current spur connected to the 30a MCB from this single socket. There would be a 13a fused connection between breaker and the first socket on the run.

For the conservatory spur (well, radia really!) I was thinking of also adding this to the ring final MCB, again with a FCU between MCB and the first socket.

How does this sound as a temporary until the CU can be changed? Are you allowed two spurs from one MCB? It's the safest option I can think of for now.

The entire installation is protected by a 30ma RCD between meter and CU.

Cheers folks

Don.
well aside from the regs contravention of having the whole thing on one 30mA......

you can have as many spurs as you have sockets. Where you connect them from exisitng sockets, j/b's or the MCB is ireelelvant. A fused spur can feed as many sockets as wish, but would still be treated as one spur for totting up

whole thing sounds a right mess anyway:rolleyes:
 
D

DonaldJ

  • Thread Starter Thread Starter
  • #3
whole thing sounds a right mess anyway:rolleyes:
You're not wrong Shakey. If I can figure out how to post pics then Ill take a photo tomorrow and post it up here - really is shocking.

Cheers for the reply.
 
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