Shower circuit only RCD

[TPES]

I'd just like some views on my method for installing a shower circuit.

Plumber has asked me to install new shower circuit on a job he's doing, Customer has an old re-wireable CU, and doesnt want to pay for new CU change..

The only work i have been asked to do is install new shower circuit.. NOTHING ELSE.
So i wont be toucing the lights, Downflow heater or any other circuit in bathroom.

So i was going to split the tails at meter and install a dedicated shower unit, Just for shower, giving the shower 30ma protection, All other circuits will be on the old re-wireable board, as i will not have anything to do with these circuits..

I will be upgrading the bonding to incoming services, testing, and notification.

Job done..

Is there anything ive missed...??

And ok to leave other circuits on re-wireable board as wont be touching them..??

 

[acat]

Cant see a problem as you are only responsible for the circuits you work on and its rcd protected so compliance with 17th just note your cert of advice given and your covered.


Chris

 

[TPES]

Thought so, I keep questioning my self, when I already know the answer to things

 

[acat]

We all do that but better safe than sorry


Chris

 

[martysparky]

Seen a job done exactly that way earlier today, a few lately.

Henley block - Tails- RCD / Isolation switch- 10mm cable- shower.

 

[pevvers]

I hope you forgot to say that you'll have some overcurrent protection in there for the circuit other than the supply fuse, as an RCD ain't got any.... But then again, a shower is a fixed current so there's no need in the regs so I'll shut up. Just a thought though!

 

[martysparky]

I hope you forgot to say that you'll have some overcurrent protection in there for the circuit other than the supply fuse, as an RCD ain't got any.... But then again, a shower is a fixed current so there's no need in the regs so I'll shut up. Just a thought though!

Yes, I did forget to mention overcurrent protection.

By the way what size tails would you recommend from the Henley block?

 

[offshorealex]

10mm would be fine, but I always use at least 16mm.

 

[Davey101]

I hope you forgot to say that you'll have some overcurrent protection in there for the circuit other than the supply fuse, as an RCD ain't got any.... But then again, a shower is a fixed current so there's no need in the regs so I'll shut up. Just a thought though!

Eh? No need for overcurrent/short circuit protection?

 

[pevvers]

I could be wrong, but that could be one way of reading the regs, 433.3.1 (ii) A device for protection against overload need not be provided for a conductor which, because of the characteristics of the load or the supply, is not likely to carry overload current, provided that the conductor is protected against fault current in accordance with the requirements of Section 434.

The supply fuse would clear line-neutral faults, and the RCD would protect against earth faults... Just one of the lovely ways to read the regs!! But I would like to hear arguments against this, as I've not really looked into too much, so am happy to learn more,

 

[super_stuey]

we do loads of these for a plumber who does new bathrooms for the council. theres only one spec for the job: CHEAP!!

Split tails, 10mm is fine, one way board.

only other thing to worry about is that pesky bonding! but see your already on2 that! its a shame coz u feel like ur doin summit wrong leaving that old dodgy board, but if they aint gonna pay........

 

[martysparky]

I could be wrong, but that could be one way of reading the regs, 433.3.1 (ii) A device for protection against overload need not be provided for a conductor which, because of the characteristics of the load or the supply, is not likely to carry overload current, provided that the conductor is protected against fault current in accordance with the requirements of Section 434.

The supply fuse would clear line-neutral faults, and the RCD would protect against earth faults... Just one of the lovely ways to read the regs!! But I would like to hear arguments against this, as I've not really looked into too much, so am happy to learn more,

Just a thought Part P is there for safety and supposed to stop the DIY stupidity. If overcurrent is applied would this be a good idea in case some silly fool decides to branch off the shower circuit for power/ lights in loft for example.

 

[pevvers]

Just a thought Part P is there for safety and supposed to stop the DIY stupidity. If overcurrent is applied would this be a good idea in case some silly fool decides to branch off the shower circuit for power/ lights in loft for example.

Oh, I would ALWAYS put overcurrent protection at the change of CSA of conductors especially in a situation like that i.e. domestic. I was just putting that reg out there to promote quaility debate. But nobody seems to want to bite!

 

[martysparky]

reg. 536.5.1

A switching device shall be protected against overcurrent.

A switching device without overcurrent protection shall be co-ordinated with an appropriate overcurrent protective device.

And of course in accordance of manufacturers instructions of the switching device.

 

[pevvers]

Yeah, I think most things boil down to "manufacturers instructions". You could say that the switching device would be protected by overcurrent such in the fact that it is unlikely that a fixed load is going to pull more current than it is designed for.

Just my thoughts...