Garage wiring

[Westctony]

Double check that @Westctony .
Having a loft conversion done, the electrician then would have just tested new or modified circuits, unless you specifically asked them to do the garage too.

Please don’t think we’re trying to put you off. The comments raised have been valid about grouping factors etc.
We get a lot of complete numptees on here asking for advice, and we wouldn’t forgive ourselves if we told them exactly what to do and they ended up burning their house down.

I understand. I know he checked the whole lot, as we needed a new unit in the house. If I start replacing it and find problems, I'll get someone in to do it.

 

[littlespark]

Sensible approach.

No need to mention safe isolation procedure, then?

 

[Westctony]

Sensible approach.

No need to mention safe isolation procedure, then?

Trust me, after taking a 240v shock aged 4 or 5, I'm a bit OCD with making sure circuits are dead (which isn't a bad thing). Both units switched off, and everything checked with a meter.

 

[Pete999]

How are you sliding the new plastic on. I assume there are separate cpcs (earths) within the steel conduit.

Trust me, after taking a 240v shock aged 4 or 5, I'm a bit OCD with making sure circuits are dead (which isn't a bad thing). Both units switched off, and everything checked with a meter.

What sort of meter ???

 

[TJ Anderson]

I haven't, but it's 1 light and 2 switches, plus a single socket (separate conduit). Current metal is 20mm, was just going to replace with 20mm plastic.

As you've got 2 circuits and 1 is powering 1 light, even if 1mm csa, it will be less than 30% percent of its grouped rating and therefore can be disregarded for the other cables in the group, of which there is one, which is the socket circuit. I really don't think grouping will be an issue. As already said, cpc is the main thing as the steel conduit may be the cpc....in which case a seperate cpc would need to be added for each circuit..

 

[Westctony]

What sort of meter ???

It's not multi meter - proper tester with probe. Used it a lot when doing auto stuff, and always when doing mains stuff.

 

[TJ Anderson]

It's not multi meter - proper tester with probe. Used it a lot when doing auto stuff, and always when doing mains stuff.

A multimeter would be fine too on the voltage setting.

 

[l4urence]

I would keep the metal conduit - if you need new bends made up I can probably help out - PM me. I'm based not far from Brighton.

 

[Charlie_]

What size is the old conduit?
Probably imperial?

 

[l4urence]

What size is the old conduit?
Probably imperial?

Imperial I'd wager - Lewden make some steel adapters for the thread size change.