Domestics...

[SUNRAY]

I remember looking at a compressor, using my multi-meter on ohms, and reading seemed OK, but returned with my mega and it showed short circuit. If multi-meter not showing infinity, then likely a fault.

Yep 400KΩ is not enough to trip the RCD but didconnecting the blue neutral leaves the RCD holding ok. I fully expect expect a very different reading using insulation tester.

If you had not showed the switch drop, I would have said three core used for that,

Twas my instant assumption until I started unpicking the bundle. I was hesitant to do so but the other downstairs lights are horrible Ikea stuff and ba****ds to fit so I avoided touching them which thankfully proved to be the right move.

 

[ebee]

I would be looking at the lights in the adjacent rooms to see if the connections are similar or offer up any clues

Strangely enough I mentioned to an electrical pal about half hour ago that some folks get the notion if an electrical circuit is not a bog standard electrical circuit it is therefore incorrect, irrespective of whether it actually is incorrect or non-compliant

 

[sparkwright]

Strangely enough I mentioned to an electrical pal about half hour ago that some folks get the notion if an electrical circuit is not a bog standard electrical circuit it is therefore incorrect, irrespective of whether it actually is incorrect or non-compliant

Yes, it's not necessarily wrong.

I seem to remember adding some lights in an unconventional manner to avoid loads of trunking - by taking the live from the light switch, and the neutral from the emergency light supply (single pole key switch). So that meant running cables with one conductor (and earth).

Naturally, a few years later the maintenance guy decided to change the new lights, and wired them how HE thought it should be, because it 'didn't look right' how I had.

*******s.

 

[SUNRAY]

Yes, it's not necessarily wrong.

I seem to remember adding some lights in an unconventional manner to avoid loads of trunking - by taking the live from the light switch, and the neutral from the emergency light supply (single pole key switch). So that meant running cables with one conductor (and earth).

Naturally, a few years later the maintenance guy decided to change the new lights, and wired them how HE thought it should be, because it 'didn't look right' how I had.

*******s.

I've even known something similar logged as C2 & C1 along with the quotes to make it safe.

It breaks my heart to see the public being abused by some of these *******s.

EDIT: I've known wiring and conduit on a farm being ripped out and replaced with larger tube because the live and neutral entered from opposite ends

 

[ebee]

The age old "Two circuits on one fuse" used to be pretty rife as a fault determination by some .
How the hack can it be?

Similarly the two rings on one fuseway crops up often (well everytime I mention it anyway = ooh I am a devil I am), Anyway it all adds to the fun.
Just to note - No normally I would not advocate two rings on one fuseway anyway but to condemn it as non compliant or dangerous is something different.

 

[SUNRAY]

Just searching for something and came across this thread which I didn't complete.

They have wall lights in the adjacent room with pull cords and hence requiring permanent live, one of the switches proved to be tracking across to the metal fitting, the yellow wire being in a wire nut and not connected to anything else.

The switch was rated at 125V.

The wall between the 2 rooms is a stud wall so assumptions are it was one room in a previous existance but I never did come to a conclusion why it was wired with 3C&E.