Loft conversion help?

[Electrician1972]

I guess the point is you can have T&E without RCD protection so long as it is not hidden < 50mm from a surface.

Feeding a CU off a 32A MCB works, but is not terribly good either as any big fault is likely to trip both the CU and the feed MCB, but again depending on what is needed that may or may not be a concern. Certainly I would be looking at a couple of RCBO in such a 2nd CU to reduce the chance of something on the sockets also taking out the lights.

But what is lacking here is the design aspect - what sort of load(s) are expected, etc. If it is just lights & sockets then a 32A feed is plenty, but if there is going to be an electric showed that suddenly looks small.

No shower the shower will be thermostatic just 8 sockets , the only thing I can think is they have a walk in wardrobe where could possible be a hair dryer and other things like tht on at the same time , but I’m thinking taking a 10mm t+e to a sub consumer unit which will be fitted close by to the existing CU and won’t be buried fit an RCD protected 2way CU one sockets for sockets one for lights ?

 

[Mike Johnson]

Why not fit the sub CU in the loft, then if it trips the recommended RCBO's in the sub board its not a trip all the way downstairs to re-set.

 

[Electrician1972]

Why not fit the sub CU in the loft, then if it trips the recommended RCBO's in the sub board its not a trip all the way downstairs to re-set.

Why not fit the sub CU in the loft, then if it trips the recommended RCBO's in the sub board its not a trip all the way downstairs to re-set.

It’s a weird one mate would be ideal to do that but the existing CU sits on the ceiling in the hall which above that will be the middle of the bedroom upstairs so planning to fit the Sub Cu beside the existing one basically and run the circuits through the ceiling and under the new floor to where they need to go

 

[Electrician1972]

Why not fit the sub CU in the loft, then if it trips the recommended RCBO's in the sub board its not a trip all the way downstairs to re-set.

It’s a weird one mate would be ideal to do that but the existing CU sits on the ceiling in the hall which above that will be the middle of the bedroom upstairs so planning to fit the Sub Cu beside the existing one basically and run the circuits through the ceiling and under the new floor to where they need to go

 

[Mike Johnson]

Don't see the problem, its running one cable into the loft for the sub-board or running a few cables from the sub-board to the loft.

 

[DPG]

If it's only a few sockets and lights can't you just extend from upstairs RFC and lighting circuit? Does it need a submain and extra board?

 

[Mike Johnson]

If it's only a few sockets and lights can't you just extend from upstairs RFC and lighting circuit? Does it need a submain and extra board?

Don't be daft, thats far too sensible. ?

 

[Electrician1972]

Don't be daft, thats far too sensible. ?

The existing RFC and lighting circuit are run in conduit , let’s say it’s really really old and rusty so would rather just run some new circuits in

 

[Electrician1972]

Don't see the problem, its running one cable into the loft for the sub-board or running a few cables from the sub-board to the loft.

Take a 10mm to a sub board in the loft and just have my two circuits from an RCD board there

 

[buzzlightyear]

Take a 10mm to a sub board in the loft and just have my two circuits from an RCD board there

Yes take a 10mm to a sub board to the loft and just have the two circuits from the rcd board there. Echo, Echo.

 

[Mike Johnson]

My suggestion would be to run a 10/6mm into the loft and put in its own CU for the circuits off a decent size RCB/RCBO in the original CU.

Post 11 page 1. Echo, Echo, Echo, Echo, Echo

 

[DPG]

Post 11 page 1. Echo, Echo, Echo, Echo, Echo

No need for a submain and new dist board just for a couple of lights and a few sockets. Just extend upstairs lighting circuit and upstairs RFC. Why over complicate things?

 

[Electrician1972]

No need for a submain and new dist board just for a couple of lights and a few sockets. Just extend upstairs lighting circuit and upstairs RFC. Why over complicate things?

Like I stated existing circuuts are all in conduit and instead of tapping in to them I wish to run new socket and lighting circuits

 

[123]

Like I stated existing circuuts are all in conduit and instead of tapping in to them I wish to run new socket and lighting circuits

I'd sooner tap into them than bodge "new circuits" into a full consumer unit. If you want new circuits change consumer or add a new one. If not, tap into the existing lighting circuit and ring. If exisiting consumer unit doesn't have RCD protection, that's something else to deal with for the additions.