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

 

[Mac]

Sounds fine mate.I would use a weatherproof box outside instead of a galv stop end box and you could get away with 2.5mm SWA instead of 4mm.

 

[Mark.W]

Yes sounds ok, as long as you have taken the load characteristics into consideration. ie he won't be welding in the shed! lol

 

[V]

try 2.5 swa

cheaper

 

[sparks1234]

Agree with Mac, should be a weather proof box, also the cable should be deep enough with a marker tape as well

 

[Spudnik]

Just to lob a spanner into the works, i cant see why a galv end box cant be used to terminate the gland and then take the 3 cores through the wall to the back of the FCU.

You could always fill the box with resin before putting the lid on.

 

[Mark.W]

Just seems a bit easier to use a weather proof box! the connections would also be easily accessable whereas if you filled a galv end box with resin you'd have a problem getting to the connections.

 

[Robo]

Thanks for the advise. Or i suppose i could use an weatherproof fcu on the outside wall and this would save chopping out for a box.Less messy. Yer will use 2.5mm. Is depth 600mm and marking tape about 300mm? Seems pretty deep to me.

 

[Mark.W]

There is nowhere in the regs that states anything about depth but as a rule of thumb the cable should be buried deep enough not to be damaged by a spade!

 

[Robo]

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

 

[Mark.W]

To be honest I don't see a problem with that as long as the cables are protected on either side, no harm in cutting a 20mm hole and sticking a bit of conduit in there though.

 

[Spudnik]

Just seems a bit easier to use a weather proof box! the connections would also be easily accessable whereas if you filled a galv end box with resin you'd have a problem getting to the connections.

Not if you take the cores with sheath through into the back of the FCU.

The resin is purely filling the hole and making the entry into the building water proof.

Plus, an adaptable box is easier to damage.

All IMHO of course

 

[Mark.W]

Ok, just had a picture of the whole end box being filled with resin! but would the connections then be waterproofed? It's ok waterproofing the entry to the building but what about the connections?

 

[Spudnik]

The connections would be in the back box of the FCU in the house.

The SWA would be glanded at the box and the internal cable taken through into the house.

 

[Mark.W]

Oh ok I see, I like the sound of that! A much cheaper option too....! A spanner in works indeed..... I like the idea lot but would probably still fit a waterproof enclosure, don't trust my resining skills