RCD for shower circuit

[phase]

Hi guys! I've got an electric shower to replace. The new one is 9kW/230. The current circuit is 10mm with no RCD protection - old Wylex DB with plug in breakers. Is it ok to come off from the 45A breaker and to put 40A RCD in enclosure.

Thanks

 

[Theorysparky]

yep

buy a decent enclosure 10mm is a tight fit at the best of times

 

[phase]

Thanks!

 

[SPECIAL LOCATION]

Just stick something like this near to your existing CU...

Wylex Fully Insulated RCD Shower Consumer Unit | Screwfix.com

But if you want a more robust enclosure..

this one is more... Beefy!

Wylex IP65 Insulated Enclosure With Visor | Screwfix.com

:coffee

 

[Theorysparky]

Specs

your too kind,,,,,to kind

 

[SPECIAL LOCATION]

Specsyour too kind,,,,,to kind

You are only creeping cuz you know the beer is getting low in KME's fridge..

and I have four bottles stashed next to be bed that I nicked of CanoeyKayak when he was not allowed to drink!!!



GuinnessGuinnessGuinnessGuinness

:Blushing

:coat

 

[NozSpark]

When ever I add RCD protection to a circuit like this I always, always, always use a decent 3 module enclosure,,, never a 2 mod one

 

[steptoe]

1 major problem I have with this,

you are proposing to protect a 40A RCD with a 45A OCPD.?!

can we think about this for a moment please.

 

[SPECIAL LOCATION]

1 major problem I have with this,you are proposing to protect a 40A RCD with a 45A OCPD.?!

can we think about this for a moment please.

well spotted! :Applaud

Only just noticed that in the OP...

but I did suggest a 63A RCD meself your honour! :Salute

 

[phase]

Thanks Step. I was not sure myself...9000/230=39.16A. Would be 40A breaker sufficient?

 

[steptoe]

its the simple rule phase,

load<OCPD<cable

except you have now inserted another device, which is required to (in your instance) to slot between the cable and OCPD positions,

load<OCPD<RCD<cable

40A MCB or 63A RCD, and TBH, no real difference in price between 40 or 63A RCDs IMO.

HTH

 

[phase]

I see you point step. Can I put the RCD after OCPD. I was going to come off from the DB and put the RCD between the OCPD and the shower.

 

[m4tty]

If you put it before the ocpd it will be covering whole board which won't e any good need to be after the ocpd

 

[Theorysparky]

this is what you need with a 40 amp mcb

Wylex 2 Way 63A RCD Board | Screwfix.com

 

[phase]

Thank you guys for all your helpfull replies. Proper enclosure really does make big difference.

 

[batty]

Very true a few extra pound spent on a decent enclosure will save a lot of time and make a decent job of it.

 

[martinxxxxxx]

I would not do this as I think it would exceed (might) the total rating of the old wylex board.

Surely Splitting the tails would be better??

Martin