supply to log cabin

[webby_58]

hello all

i have to get a supply to a log cabin and have the following arrangment :

TN-S supply in house
House CU MCB's no RCD
supply to garage CU via 16amp MCB (2.5 t/e) / garage CU has 63a 30ma RCD
approx 35mtr to garage and 50mtr to house in cabin approx 6 sockets maybe an electric heater and 1 light circuit

i propose to spilt the tails in the house into 100a henley block and take a new swa to the cabin. CU in cabin with 30ma RCD 6a MCB for lights 16a MCB for socket ring

my query is the cable size. do i have to use 10mm swa 3 core to provide the correct size earth ?

what would be the best way to do this also taking into account cost.

please help.......!!!!

thanks in advance guys.

 

[i=p/u]

you can support earth system with earth rod thats all im telling you cause thats all i know, stick with me you'l go long way

 

[Guest 004]

you can support earth system with earth rod thats all im telling you cause thats all i know, stick with me you'l go long way

It is better to create your own equipotential zone, and not export the earth

 

[SirKit Breaker]

Its all in the book about earthing.

 

[Hawk81]

It is better to create your own equipotential zone, and not export the earth

Once again wrong!! Where is this reg you were going to provide!!?? All this talk about hot tubs and services has nothing to to with the op. He has not mentioned any of these things. Plus would a log cabin not be made from timber? Timber walls and floor ect.

 

[High Tower]

I have TT a outbuilding before, however this was not to comply with the regs but simply out of convenience and design. IE it was easier and more cost effective to bang a spike in.

 

[johnboy6083]

im just asking a hypothetical question, in order that we may all get another point of view.

 

[i=p/u]

throw another spanner in

 

[johnboy6083]

i aint got enough spare.

 

[Guest 004]

The exported earth, can be different to the ground earth of the outbuilding, thus causing a potential difference.

 

[i=p/u]

short circuit your out of there

 

[Hawk81]

The exported earth, can be different to the ground earth of the outbuilding, thus causing a potential difference.

So do you earth spike every outside socket, or metal ground light? Still waiting on this reg??

 

[i=p/u]

even if there was services ,hot tube etc, could you just main bond to cu in cabin and . think we need some sums in here ....

please keep workings out neat for no confusion?/ couple of spanners comning nowww

 

[Chr!s]

Is there not further requirements for buildings constructed mainly from wood ?

 

[IQ Electrical]

Is there not further requirements for buildings constructed mainly from wood ?

422.4 has requirements but they are more concerned with luminaires and wiring systems within the combustible structure.

 

[IQ Electrical]

Just to save going over lots of old ground:

http://www.electriciansforums.net/e...159-good-guide-exported-pme-outbuildings.html

I realise the OP has a TN-S system but this thread will naturally migrate to TN-C-S scenario's!