Lighting Circuit Spur Q&A

[Thomas Connolly]

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

 

[telectrix]

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.

 

[Thomas Connolly]

Excellent. Thanks as always @telectrix
You're a star.

 

[Midwest]

Give over, he's from t'up north.

 

[Taylortwocities]

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.

 

[Deleted account]

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

 

[ipf]

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

…...already is.

 

[Thomas Connolly]

Thanks chaps.
Yes there is already RCD protection on the circuit.
@Taylortwocities that's exactly the response I was after. Makes sense now!
Thanks .