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Discuss Lighting Circuit Spur Q&A in the Electrical Forum area at ElectriciansForums.net

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Hi Gents,

Just a quick question. I'm adding some lights to an extension, just a few spots which I plan to take from the existing downstairs lighting circuit using a junction box.
Question being, do I need to add an FCU?
I'm comparing this this adding a spur to a ring final circuit and if adding more than one socket, you'd add a FCU.
Does the same rule apply to lighting circuits? There's going to be about 9 spotlights and two outside lights.
Has RCD protection etc
Thanks
T
 
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telectrix

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Mentor
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if you are taking the feed from a lighting circuit, no need to add a FCU as it's already on a 5A/6A fuse/MCB. just ensure that allconnections are compliant and safe. test circuit after alterations.
 

Taylortwocities

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Advent Win
I'm comparing this this adding a spur to a ring final circuit and if adding more than one socket, you'd add a FCU.
The point is that the requirement for an FCU applies to adding more than one socket to a RING FINAL circuit.
Lighting circuits are RADIAL circuits where there is no restriction on the number of devices/accessories on a circuit subject to (but not restricted to):
  • cabling distance
  • the value of the protective device on the circuit and (of course)
  • the total demand.
 

Paignton pete

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You will however be required to give the extended part of the lighting circuit you are installing RCD protection.
 
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