Is This Ok?

[Nicky Tesla]

saw an rcd enclosure next to a DB today to feed a shower. The feed to it came from the out of the main switch via a 6mmT&E cable through the back into the void and in through the back of the rcd enclosure from the void.

is there any problem with this i think not at the moment.

 

[Andy™]

does it have any fault protetion?

 

[Nicky Tesla]

no (apart from the mains fuse) the same as 10mm tails would have but it is only a very short peice and is hidden away in the void

 

[gselectrical]

A problem could arise if someone were to install a shower requiring a larger cable?

GS

 

[Nicky Tesla]

thats their problem

 

[Andy™]

you should not be relying on the service fuse for fault protection. either way, i doubt the 4mm earth would be able to operate it if there was a fault anyway

 

[Barx]

Agree with above, It needs a MCB or equiv. Alot of 'less knowledgeable' people seem to think that an RCD that in rated at say 40A will act as a mcb would. Not the case!

Now if it came out of a breaker in the board and then the RCD was inline, that would be different.

 

[SLIPSHOD & SLAPDASH]

no (apart from the mains fuse) the same as 10mm tails would have but it is only a very short peice and is hidden away in the void

Is there fault protection in the rcd enclosure then ?

 

[Nicky Tesla]

the earth wire only comes into effect after the rcd and mcb to the shower and with an rcd there is no problem with 4mm. There could however be a short between L&N on the T&E but there could be on 10mm tails too.

Barx.........it doesnot come from a breaker in the board but there is one in the enclosure.

 

[ProDave]

Was it JUST an RCD in the enclosure? People keep asking but you don't answer.

Could it have been a 2 pole rcbo? I've done that before to feed a shower when there was no room to fit an RCD and separate mcb.

 

[Nicky Tesla]

i just did didn't I Dave?

 

[SLIPSHOD & SLAPDASH]

.it doesnot come from a breaker in the board but there is one in the enclosure.

That makes all the difference, It would have helped if that was mentioned.

 

[Barx]

That makes all the difference, It would have helped if that was mentioned.

Indeed, the way I read the OP was that the enclosure contained JUST an RCD...

Sorry if I mis-read.

 

[Nicky Tesla]

That makes all the difference, It would have helped if that was mentioned.

the issue is the fact the cable goes to the enclosure without fault protection, and is in t&e and not the normal tails

it was an 8.5KW shower before you ask.

 

[SLIPSHOD & SLAPDASH]

the issue is the fact the cable goes to the enclosure without fault protection, and is in t&e and not the normal tails

it was an 8.5KW shower before you ask.

But without telling us there was fault protection in the Rcd enclosure it changes the whole picture.

 

[Steve3948]

What is the 4.0mm that's been mentioned ?

 

[Barx]

Well, now you say that, No! I would not say it is OK. should not be burried as there is no protection for that type of installation method.

 

[SLIPSHOD & SLAPDASH]

If the 6mm Tw& e

Well, now you say that, No! I would not say it is OK. should not be burried as there is no protection for that type of installation method.

What about rcd protection if the cable is less than 50mm deep.

Also 6mm tw&e can sometimes have a 2.5mmm cpc.

 

[Nicky Tesla]

What is the 4.0mm that's been mentioned ?

andy mentioned 4mm.........2.5mm earth on 6mmT&E

 

[Nicky Tesla]

If the 6mm Tw& e

What about rcd protection if the cable is less than 50mm deep.

Also 6mm tw&e can sometimes have a 2.5mmm cpc.

it is more than 50mm deep it is in the cavity of a plasterboard wall which is where the tails to the main switch comes from as well so no henly block connection for this.