Fitting a shower enclosure RCD

[clarabel]

Hope you can help. I want to fit a RCD to the shower radial currently running from a Wylex rewireable fuse at 40A.

I have a shower enclosure fusebox which has a 40 A MCB with a 30ma RCD on the side of it. What is the best way to bring the feed into this box.

Can I just bring 10mm2 out of the existing CU box from the current rewireable fuse to the new box, but that gives me two fuses in the one line, does not seem correct. Or can you get a link through for the main CU fuse and use the new shower enclosure's MCB only, shounds more sensible.

Can anyone tell me what the best practise is?.

 

[EdwardCurrent]

Hi,

Henly block and separate tails can be an option, but depending on the current rating of the RCD and size of the enclosure you have etc, you may be restricted for room. Many of the enclosures I have seen do not have the neutral or earth bars in place.
Hope this is of some help.


Ed

 

[Taylortwocities]

Henley block (or new consumer unit) are the only options. Old rewireable fuse Wylexes have max current loading of 30A per way and 60A total for the board.

Its written on the front "Maximum load 60A" or something meaningful like that!

 

[clarabel]

Thanks for the reply.

The enclosure is just big enough to accomodate the MCD and RCD so there is not a great deal of room. There is no Neutral bar but there is an earth rail as you would expect.

Do you normally use Henly blocks on the tails post meter - pre CU?. There is no electric company isolator which make this a pain without taking the supply fuse out.

Is it not good practice to come of the existing wired fuse and put the new MCB in-line with it?.

 

[securespark]

No!!

 

[DESL]

Henly block to one of these or similar

http://www.tlc-direct.co.uk/Products/CMP1slash50SH.html

There should be a neutral & earth bar and sufficient space to fit 10mm2 cable.

I hate to say this but, if you are asking about the acceptability of 2 cct protectors in series should you be tackling a job such as this.