Borrowed Neutral

Laziness...

Wasn't that the MPs daughter which led to Part P ?

The two way switching for one of the the landing lights has a borrowed neutral. Live comes from one lighting circuit, probably downstairs, the neutral is on the upstairs lighting.(*)

I can't really see it saving much money. Difference in cost of a few meters of 3C&E v T&E. Time? Still have to run the cable, still have the ends to do.

That's what showed up the problem here.

(*) I guess that as the downstairs, switch will have downstairs live for other lights downstairs and the upstairs light fitting neutral on the loop through. Just plain T&E between the two two-way switches and fitting.

No - that was a metal rail and a diagonal cable.

What makes you think I was suggesting otherwise?

However, with a borrowed neutral from another circuit that is not turned off, the accidental disconnection of the neutral on that circuit could give rise to the shared neutral becoming live via a connected load. The accidental disconnection of the active circuit neutral could occur after voltage checking and could result from something as simple as snipping a neutral line previously tested as sitting at zero volts.

That's commendable. I try to do something similar for tenants. But do you suppose anyone actually _reads it_ ? My experience would suggest not. Horses to water.

(And I can see no especially good reason to replace wired fuses. They're not better than other methods, except in particular circumstances, and worse in others). With the original fuses, you might even get a metal box, as is apparently now being favoured once again over plastic. If macaroon gets his way, will the colours also be changed again to red and black?).

They are a fall-back for when something goes wrong or doesn't work. A bit like all instructions!