Cooker circuit question

[Roger Hayter]

And in the common domestic arrangements it is an RCD covering more than the cooker circuit that will trip rather than the MCB. Not if you have RCBOs though.

[Roger Hayter]

I reckon it's an acceptable wiring practice under some conditions in the UK rather than a "fact", but fair enough.

[Bert Coules]

And what constitutes "short" in this instance?

[Roger Hayter]

I'll leave others to give a definitive answer, but if all the connections are on the same or adjacent walls I doubt there will be a problem. Especially given the junction box is supplied with 6 or

10mm^2.

[Bert Coules]

Thanks for that. The longest spur will in fact be about three feet, so I should be OK.

[ARW]

A live to either neutral or earth

[Bert Coules]

Boom, boom.

[dennis]

Or a live/neutral to a live/neutral on a different circuit. Won't always trip RCDs but will trip RCBOs, sometimes. Quite a lot of DIYers understand borrowed neutrals causing trips but are completely flummoxed when there is a live/live short.

[ARW]

What do think of this one?

16mm T&E straight into the meter with a 100A 1361 type II fuse for protection.

It's about a 20m run of cable mostly just thrown across the floor of a building site with no mechanical protection to power the site cabin. It's only mostly because there is the bit where it is just suspended with a couple of cable ties at each end at just above head height between the house and the site cabin with no catenary wire.

[Roger Hayter]

Did you mean 16mm? I would have thought that would have been ok until someone rested on a spade on it. But it looks somewhat smaller.

[Roger Hayter]

(FAOD I am not asserting that 16mm^2 *would* be adequate without further information. It was a joke. Alright?)

[ARW]

The 16mm T&E installation is the joke:-)

It's a real installation.

If you ever needed an adiabatic equation then that's the time to use one. As you said "rest a spade on it".

It will end in tears and they will not be mine.

[Robin]

I enjoyed that, thanks. Really sloppy work. I like to think I would at least have taken the time to drill a few holes in the board below the meter so I could say "Blow me, some bugger's nicked the CU & meter tails!"

[ARW]

Oddly enough there was not a meter there last week!