Shed power

[Robo]

A guy wants me to get him a power supply into his shed. Shed will have relativly small load. A light and a socket inside. Does this plan of attack i have sound ok. Have a 13a fcu spurred off down stairs ring (rcd protected ring). Back entry out of fcu to a galv end box. Use 4mm 3 core SWA burried under walkway (about 5m run) into shed and connect into another fcu 5 amp for the light and connect socket to supply side of fcu. This is by far the cheapest option to putting in a new circuit and board etc. Thanks Robo

 

[Robo]

Put silicon on the back of the back box and thats it sorted. water can not get to the cables or into the house.

 

[thepurple1]

I seem to remember something from the 16th edition regs that anything outside the house would require its own earth rod. I have not done the 17th edition yet!

 

[Mac]

Cheers for advise, think i will go for weatherproof fcu also to cut down on internal mess.

Is it ok to have the L N cpc conductors just drilled through the wall as these will only b single insulated?? or do i have to put conduit in the wall?? Robo

Cables will need to be protected,so a bit of pipe through the wall will do

 

[Spudnik]

A lot of cable manufacturers will also recommend that silicone is NOT used around cables due to reaction with the PVC.

 

[Mac]

A lot of cable manufacturers will also recommend that silicone is NOT used around cables due to reaction with the PVC.

I was told that too about silicone.IP rated FCU outside and it's sorted.

 

[electricAl]

Apparently, not only is silicone considered to adversely affect the PVC sheath/insulation, it also doesn`t give as good a seal as many expect - certainly not outside in the cold British winter...like now.

Got to say i regularly do what Jason described - sometimes with a galv box, usually with an IP adaptable one - & feed the still inner pvc sheathed conductors thru PVC conduit in the wall into the back of an FCU. IP FCUs are ridiculously expensive (especially MKs) and the way described works fine anyway - altho it`s easy enough to make up your own IP FCUs cheaply now.

Oh, & in case you weren`t aware Robo, the work`s notifiable

 

[down2earth]

Just to confirm, the SWA should be buried 500mm deep (600mm if in a veg patch or similar) and the marker tape should be 150mm deep.
Regards

Down2earth