How about this one

[brizospark]

OK working in a factory at the moment and the wiring is diabolical

Here's one anecdote-

Lighting circuit - lights are on

Take fuse out - lights go out
Fuse in, neutral disconnected - lights go out
fuse out, neutral disconnected - lights on

Work that one out

 

[Antman]

Long friday for you then

 

[Deleted member 9648]

Work that one out

Mind if I leave that one to you?

 

[topquark]

Sure it's not an emergency light

 

[telectrix]

cross link between 2 circuits.

 

[topquark]

With time delay of course

 

[telectrix]

booby-trapped WWII bomb. you have 30 seconds to evacuate your................

 

[brizospark]

I can assure you it aint an emerg. Lt

 

[topquark]

I can assure you it aint an emerg. Lt

I couldn't resist it. Like my teacher said "must try harder"

 

[Bradzz]

? are the lights din but still on?
What type of factory is it?

 

[Bradzz]

Are you near to pylons, transmition towers, electromagnetic fields, can cause fluorescent lamps to glow.

 

[Bradzz]

Or are you near one of these? Or 2?? Or even 3 of them???

 

[Bradzz]

 

[Short Circuit]

Have you done an IR between N+E on those circuits - i bet the lights are taking their neutral through the earthing of the trunking somewhere

 

[Octopus]

How many lighting circuits are there? In a factory I'd expect to see more than one.