UK RCD on bathroom ceiling?

[gggrrr209]

hello

im an industrial maintence electrician (mainly emergencies in factory processes & HV work) I do very few domestic jobs - i did pass my 18th edition in 2019 but memory is very vague

doing a bit of work in my home and removing an electric shower and fitting thermostatic & also fitting a whirlpool bath

regarding the bath, my thoughts were either

1. take a spur from the ring (rcd protected) in converted attic directly above and fitting a RCD fsu in the ceiling where the shower switch was - ceiling height is 2.4m and switch is not above the bath

2. Fitting the rcd fsu in the wall next to the sockets in the attic

From the RCD it’s going to run down some conduit in the wall to under the bath into an adequate IP rated box

The bath instructions say “it must be fitted outside the bathroom” but i figured if it’s accessible and not in a zoned area it should be fine? I’d prefer it wasn’t in the attic tbh

CU is already full and I don’t fancy running a new t&e to the existing “shower” breaker if i can help it

appreciate any thoughts

 

[sinewove]

hello

im an industrial maintence electrician (mainly emergencies in factory processes & HV work) I do very few domestic jobs - i did pass my 18th edition in 2019 but memory is very vague

doing a bit of work in my home and removing an electric shower and fitting thermostatic & also fitting a whirlpool bath

regarding the bath, my thoughts were either

1. take a spur from the ring (rcd protected) in converted attic directly above and fitting a RCD fsu in the ceiling where the shower switch was - ceiling height is 2.4m and switch is not above the bath

2. Fitting the rcd fsu in the wall next to the sockets in the attic

From the RCD it’s going to run down some conduit in the wall to under the bath into an adequate IP rated box

The bath instructions say “it must be fitted outside the bathroom” but i figured if it’s accessible and not in a zoned area it should be fine? I’d prefer it wasn’t in the attic tbh

CU is already full and I don’t fancy running a new t&e to the existing “shower” breaker if i can help it

appreciate any thoughts

For some reason

hello

im an industrial maintence electrician (mainly emergencies in factory processes & HV work) I do very few domestic jobs - i did pass my 18th edition in 2019 but memory is very vague

doing a bit of work in my home and removing an electric shower and fitting thermostatic & also fitting a whirlpool bath

regarding the bath, my thoughts were either

1. take a spur from the ring (rcd protected) in converted attic directly above and fitting a RCD fsu in the ceiling where the shower switch was - ceiling height is 2.4m and switch is not above the bath

2. Fitting the rcd fsu in the wall next to the sockets in the attic

From the RCD it’s going to run down some conduit in the wall to under the bath into an adequate IP rated box

The bath instructions say “it must be fitted outside the bathroom” but i figured if it’s accessible and not in a zoned area it should be fine? I’d prefer it wasn’t in the attic tbh

CU is already full and I don’t fancy running a new t&e to the existing “shower” breaker if i can help it

appreciate any thoughts

For some reason rcd fused spurs are no recognised by the regs for additional protection,so maybe a dp rcd in an enclosure at the cu would be a solution.
Regards,S

 

[westward10]

Why use another RCD if the ring final already has one, assuming it is 30ma.

 

[gggrrr209]

Why use another RCD if the ring final already has one, assuming it is 30ma.

Yeah it’s 30mA - I get what you’re saying, I’d just rather have one dedicated for the bath for peace of mind. I need to fit a fused spur for the pump anyway so figured I may as well get an rcd one

 

[nicebutdim]

You have 30mA RCD protection. Introducing a second RCD won't offer a single benefit, but will add potential inconvenience through lack of selectivity.

Fuse down as per manufacturer's instructions and stick a label on the pump to let people know where the find the spur.

I'd also look at other potential cable routes which don't involve surface conduit - it may not be possible, but more often than not there'll be a route from attic to bathroom floor.

 

[gggrrr209]

You have 30mA RCD protection. Introducing a second RCD won't offer a single benefit, but will add potential inconvenience through lack of selectivity.

Fuse down as per manufacturer's instructions and stick a label on the pump to let people know where the find the spur.

I'd also look at other potential cable routes which don't involve surface conduit - it may not be possible, but more often than not there'll be a route from attic to bathroom floor.

I assume it’s fine to fit a non-switched fused spur on the ceiling for the pump?

the conduit I’m running will be in a channel in the wall, plastered and behind the wetwall - using the previous channel for the electric shower (water up, cable down)

 

[westward10]

If you have a TN earthing system an unswitched spur is fine.

 

[gggrrr209]

If you have a TN earthing system an unswitched spur is fine.

ok cheers for the help lads