100amp Isolator switch required

[Deleted member 26818]

If the cables to the new CU position are to be concealed in any walls, then it’s very likely they will need RCD protection.
If however they are just going to run up the surface of the wall into the ceiling and along to drop down into the new CU, RCD protection will not be needed.

 

[Building advice]

Thanks for that. The builder and I have managed to get the cable in today. It's a 25mm swa cable and it goes behind a stud wall and then up into the ceiling and then back down into the room where the CU is situated. In this case will the miniature circuit breaker not suffice? Thanks

 

[Deleted member 105166]

Thanks for that. The builder and I have managed to get the cable in today. It's a 25mm swa cable and it goes behind a stud wall and then up into the ceiling and then back down into the room where the CU is situated. In this case will the miniature circuit breaker not suffice? Thanks

How is your electrician going to inspect this cable? From what you have described, much of it is concealed. It would have been a better idea to assist your electrician in pulling it through, rather than the builder.

 

[Building advice]

I've taken photos and it was cheaper to get the builder to sort this side. The electrician will come later to hook up one side to the meter and the other to the CU.

 

[Charlie_]

Sounds like mcb will be ok, saves on the enclosure but the electrician will make that decision when he connects it all up

 

[Deleted member 26818]

Armoured cable doesn’t need RCD protection.

 

[DPG]

All this time and hassle to save money on just getting an electrician in to design/install/test the job properly.

 

[davesparks]

Thanks for that. The builder and I have managed to get the cable in today. It's a 25mm swa cable and it goes behind a stud wall and then up into the ceiling and then back down into the room where the CU is situated. In this case will the miniature circuit breaker not suffice? Thanks

Hopefully you've left plenty of working room for the electrician to work on the cable an dfit the correct glands to the end of it. You can't just leave an SWA that size sticking out of a stud wall and expect someone to be able to terminate it into the back of an enclosure.