power to garden shed

[young spark]

hello everyone. need some advice please.

i need to run a supply to a garden shed. goin to use swa, not sure what size?
it a 35 meter run. installing a 2 way rcd board consumer unit in the shed
will install 2 lights and 3 sockets. for freezer and lawnmower. db in the house is a not rcd, will i need to put rcd in the house also. any advice will be much appreciated. thanks.

 

[johnnyb]

I would run a 6mm 3core swa mate, gives you a little scope to expand if need be, thats just off top of mi head .

 

[young spark]

how about 3c 4mm? Iv got som already, save me buyin more cable.

 

[Mac]

how about 3c 4mm? Iv got som already, save me buyin more cable.

4mm fine mate.What state is the CU in

 

[High Tower]

how about 3c 4mm? Iv got som already, save me buyin more cable.

I wouldnt use 4mm as i reckon u might be on the wrong side of the VD over 35m, the only reason you need rdc in house is that you are going outside with it, otherwise you wouldnt need it as SWA offers further mechanical protection

 

[johnnyb]

with out gettin mi little red book out mate, 6mm for me, as i said gives a little belt and braces over what is ater all 100ft away and VD could be an issue or other defining characteristics that determine cable size.

 

[young spark]

thanks for your help people.

 

[Yooj]

HI, What earthing arangment is your property?

Are you going to TT the shed, does the shed have any extraneous conductive paths? i.e. metalwork structure etc?

35 mtrs is a long way to export an earth...DNOs usually only allow 2 mtrs.

Yooj

 

[Mac]

4mm is fine mate,can't or won't see a problem with it.Try this link.
Voltage Drop Calculator

 

[young spark]

tns system. was going to use core in the swa and the armouring as earth. brick buit shed, no metal work.

 

[Yooj]

tns system. was going to use core in the swa and the armouring as earth. brick buit shed, no metal work.

Export the Earth and terminate it in an adapter box.

Then TT the shed. If the TNS earth were removed for whatever reason, anyone in the garden with electrical equipment run from the shed could be exposed to dangerous potential if the RCD were to fail.

Yooj