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EddieB

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Arms
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Whilst replacing an old DB I found that an outside light had been wired in and doubled up at the MCB, foolishly I had counted the the old fuses without taking the cover off, the new DB I had bought allowed for no more expansion can I double up at the MCB with this extra light, rings circuits I know is a no goer for an additional socket to be added due to the rating of the MCB (32a) but can I double up on a lighting circuit.:confused:
 
W

WarrenG

Welcome!

What happens if the customer wants additional installs in the future and no spare ways?

Not good practice to double up and it doesn't comply, I would just exchange the CU for one with more ways plus expansion.
 
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EddieB

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Arms
  • Thread Starter Thread Starter
  • #3
Warren G
Thanks for the prompt reply Let's assume I cannot change it, I know it aint good practise but what doesn't it comply to? is there a regulation that stipulates you cannot do it.
 
W

WarrenG

Hi mate,

Take a look at Big Red - 314 Division of Installation (314.4) in particular.
 
S

Spudnik

Hi mate,

Take a look at Big Red - 314 Division of Installation (314.4) in particular.
Sorry Mr G gotta disagree with ya there!

Doubling up on an MCB is no different from teeing off of a rose somewhere!

As long as ALL the lighting is not on one MCB if there are just 2 circuits then no prob!

Same with RFC and spurring off 32A MCB. No Different than a spur from a socket outlet.
:)
 

EddieB

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Arms
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Thanks boys
It's good to Talk
 
W

WarrenG

Sorry Mr G gotta disagree with ya there!

Doubling up on an MCB is no different from teeing off of a rose somewhere!

As long as ALL the lighting is not on one MCB if there are just 2 circuits then no prob!

Same with RFC and spurring off 32A MCB. No Different than a spur from a socket outlet.
:)
Very logical point Jas, think your right on that! :eek:

Had a dig around and found thats its a question / answer that is published in the NICEIC technical helpline book 'From the phoneline'....

Question There are no spare ways in the DB for my new lighting circuit can i use a existing one?

Answer YES although Reg 314.4 requires each final circuit to be connected to a seperate way in a bistribution board, a circuit may have more than one "branch" connected to the appropriate way.

nice one! ;)


Thanks boys
It's good to Talk
There you go mate, thanks what the forums all about. A logical answer. ;)
 
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