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Hi,

have a shower connect up, the run to CU is maybe 8 metres, (3036's) but the CU is in a meter cupboard outside.

There is no space to put a rcd unit inside, and not enough room for a henley block..

was going to get a plug in 40a wylex mcb as there is an existing spare way in the CU, go through the wall (the room with a separate shower room is directly behind the existing board)

and use a small shower CU with RCD to connect this, Ideally it would have 16mm tails from a henley block but i cant do that with space constraints...

Is it pointless to go from original CU, 40a plug in wylex, into rcd unit with a 40a 60898? i am assuming the plug in wylex's have the same disconection times?
 
If you're going through the wall with the cable from the old board won't it need RCD protection?
 
it'll need a RCD anyway, special location , section 7, BGB. and it doesn't need RCD for going through a wall, only cables buried up/down wall < 2" deep without blah, blah. blah.
 
shower is 8.5kw,

yes, i suspected that the 20cm distance through the wall would bring up this issue...
but it can be mechanically protected by a short length of conduit..

i want to get the rcd in before the wall, but there really is no space, and without changing the entire CU there is no way of implementing that.

any suggestions?
 
it's the shower that's in the location. and you don't need to fit RCD to cable passing through a wall.
 
hmm, maybe i haven't explained this right,

outside CU, plug in 40a wylex (60898? not sure) to fit 3036 slot. hole to opposite side of wall, directly into new CU with RCD and 40a 60898, to feed shower.

but the 40a MCB in the shower CU may be pointless, but i am unsure if the plug in wylex fuses operate the same as 60898's
 
the later plu-in MCBs are 60898. it's the old push button ones are 3871. just come off your 40A wylex MCB ( and N & E, of course ) and fit RCD in enclosure other side of wall. you don't want 2 MCBs in series. no discrimination.
 
They do.

From what your asking you can just wire the shower into the spare way and put the push MCB in place, it'll be fine.

- - - Updated - - -

As long as the cables sufficiently meet the requirements for a non RCD circuit.
 
They do.

From what your asking you can just wire the shower into the spare way and put the push MCB in place, it'll be fine.

- - - Updated - - -

As long as the cables sufficiently meet the requirements for a non RCD circuit.

the shower itself must be RCD protected. 701.411.3.3
 
I did think as much, hence my idea for a local RCD, the RCD doesn’t have to be in the board but it does have to be before the circuit enters the zone, unless the whole cable require protection due to the installation characteristics, would you say?
 
ok, thanks.. yeah it was the push button ones i was thinking perhaps they were similar to the new plug in ones.

and cheers for the advice, and of course the shower needs rcd protection, hence this entire post.

nice one, feel free to talk amongst yourselves
 

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