Power to outbuilding and a pond pump!

[Paul Downham]

Hi all,

running power to an outbuilding and then a pond pump but I have a few questions. Here is my plan;

The dwelling installation is TT

Ensure dwelling FB has 30Ma RCD Protection and a spare slot
Run cable to garage
2 way FB

Obviously rate the cable, etc..

Questions

Does the cable NEED to be armoured? I always do it in armoured for best practice.
Does the garage need it's own earth electrode?
I have never run power to a pond pump, what are the regs for this and what is the best way (from the outbuilding)

Thanks all

 

[ukpablo]

I would do it in armoured.

This may give u some pointers

http://electrical.------.org/wiring-matters/16/complete.cfm

 

[telectrix]

pond pumps often come with a plug fitted, in which case, fit an IP rated external socket. SWA all the way. be a good idea to come from the house DB from a non RCD way, and RCD the outbuilding. that way a fault outside won't trip the house RCD. you don't need an extra earth rod, but it would be advantageous , as it may well bring your Ze down. bear in mind that said works are notifiable to LABC.

 

[Deleted member 26818]

No the cable doesn't need to be armoured.
You can provide mechanical protection (if required) by other means, such as conduit.

 

[ukpablo]

prob cheaper to do it in armoured though! depends what your faced with at the property really, lay of the buildings, ground conditions etc. all will determine what u run it in really.

 

[Deleted member 26818]

prob cheaper to do it in armoured though! depends what your faced with at the property really, lay of the buildings, ground conditions etc. all will determine what u run it in really.

Quite.
I'm assuming that the OP's customer is querying the expense of using SWA.

 

[ukpablo]

true spin, not saying running it in conduit may not be a better solution, depends on circumstances really. either way is acceptable and thats what the OP was after i suppose, pointers and best practice methods.

 

[Deleted member 9648]

pond pumps often come with a plug fitted, in which case, fit an IP rated external socket. SWA all the way. be a good idea to come from the house DB from a non RCD way, and RCD the outbuilding. that way a fault outside won't trip the house RCD. you don't need an extra earth rod, but it would be advantageous , as it may well bring your Ze down. bear in mind that said works are notifiable to LABC.

As the existing is TT it's likely he will have to RCD the SWA to provide earth fault protection.
In an ideal world you would be looking for the house DB to have a time delayed 100ma RCD main switch and come from this.Unfortunately this is a rare scenario and if coming from the house CU it may not be possible to avoid nuisance tripping in the house. An alternative would be to henly block the tails into a separate 1 way cu and either fit a 30ma rcd there or even better a 100maT/D with a 30ma in the outbuilding.