Kitchen light powered from wrong circuit??

[Cisco999]

Hi all,

I am hoping you can provide me with some insight. I've just bought a new light fitting, and before fitting I attempted to turn the downstairs lights off at the CU. It killed all lights bar the kitchen light (the one I was planning to change ). However, to stop power to the the kitchen light, I have to trip the MCB for the upstairs plug sockets. The big rcd on the CU will trip everything including the rogue light as you'd expect.

I suppose my question is two fold;

1. Is this dangerous and should I not proceed with changing the fitting?

2. Is this common and is it easily remedied?

Really appreciate your time.

Many thanks,

 

[*-jester-*]

Is the kitchen an extension?
It sounds like somebody has spurred the light off the upstairs ring, there could be a switch fuse spur somewhere to isolate the kitchen light circuit. It is not ideal, no and it should have been labelled on the consumer unit.

 

[Cisco999]

No, it's the original designated kitchen.

If that's the case, would it be correct that I can remove it from the upstairs ring, and run 1.5mm T&E from the last rose in the downstairs lighting circuit to power it instead? Thus meaning it'll isolate along with the other lights?

 

[telectrix]

No, it's the original designated kitchen.

If that's the case, would it be correct that I can remove it from the upstairs ring, and run 1.5mm T&E from the last rose in the downstairs lighting circuit to power it instead? Thus meaning it'll isolate along with the other lights?

sounds a plan. as long as you're competent to do it.

 

[*-jester-*]

As above, providing it won't overload the existing lighting circuit and assuming the ceiling rose has a loop feed.

 

[littlespark]

Or you could leave it as is. It must have been wired that way for a reason, and it could be a lot of upheaval.
If it works properly, and its been installed correctly, re. the regs, then just leave it as is, and leave a note at the db to remind you.

 

[buzzlightyear]

Best to isolate the main isolator the big red switch and do the light and you will be safe.

 

[Taylortwocities]

If that's the case, would it be correct that I can remove it from the upstairs ring, and run 1.5mm T&E from the last rose in the downstairs lighting circuit to power it instead? Thus meaning it'll isolate along with the other lights?

You can run it from any ceiling rose (etc) that has a permanent live and neutral.
PS I would use 1.0mm T&E. There's usually no need for the big stuff in domestic, and you'll soon run out of terminal capacity.

 

[Markyd]

You can run it from any ceiling rose (etc) that has a permanent live and neutral.
PS I would use 1.0mm T&E. There's usually no need for the big stuff in domestic, and you'll soon run out of terminal capacity.

Should'nt you use the same size cable as the rest of the circuit?.......so if the other fittings are wired in 1.5 then the addition should be the same

 

[Deleted member 26818]

Should'nt you use the same size cable as the rest of the circuit?.......so if the other fittings are wired in 1.5 then the addition should be the same

Not if it’s a spur off a Radial or an extension to the Radial.

 

[davesparks]

Not if it’s a spur off a Radial or an extension to the Radial.

Why not? I was taught the same, extend circuits with the same size and type of cable unless there is a particular reason not to.

 

[Deleted member 9648]

I usually wire domestics in 1.5mm, bear in mind the reduced permitted volt drop on lighting.