Lighting Ring Main

[Terry2sheds]

Just looking at all Wiring Diagrams in FAQs Sticky.

All show supply to next light, but I've discovered a light unit in loft that has no supply out. I know this could be last on circuit, but should it not have a return wire to complete the ring?

If it should, is it ok just to complete by installing a return wire to the previous fitting in the circuit?

 

[sparkydude]

Lighting circuits are normally wired as a radial and so a return leg is not required.


Nick

 

[sparkwright]

Only 30/32 amp socket circuits can be wired in rings.

Lighting circuits are radial circuits, and the last light does NOT have a cable returning back to the mains.

Most wiring diagrams will show fitting in the 'middle' of a circuit, with feed in, feed out and switch cable.

I suppose you are less likely to come across an end of line light. Perhaps the FAQ Sticky isn't clear enough in showing what the last fitting should look like.

 

[ban-all-sheds]

Looks pretty clear to me:

http://www.diynot.com/wiki/electrics:lighting-circuit-layouts

 

[Terry2sheds]

Thanks for the help and understanding.
I suppose I haven't ever come across the end light before, only by coincidence that I came across this one.

I'll know in future.

I suppose everything on a diagram is pretty clear if you're certain of what you're looking at. It's like quiz questions, they're all easy if you know the answer.

 

[sparkwright]

It's also worth knowing lights aren't always wired in a line.

You can tee off any light to feed more, in a sort of Y formation. You can tee off any point.

 

[Terry2sheds]

Thanks Sparkwright for your help.
I fitted a loftlight a couple of years ago and ran a supply and return wire, thinking I needed to maintain the ring!
Obviously didn't need to, but it's been ok, with no problems.

 

[peterduckett]

Why the double post didn't get the answer first time?

http://www.diynot.com/forums/viewtopic.php?t=247011