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Hi there.
My friend is building a new house. He has decided to put service point in and out building next to new house. A duct has been run from out building to house. I will be using 16mm three core to supply house db. I've decided to use rcbo's for circuits in the house. But I am unsure if the cable at the out building side should be rcd after the cut off to supply the house? Any advice would be appreciated.
 
Two things:

1) Check your calculations for voltage drop for the lighting - you might need to upgrade that 16mm to a 25mm depending on length of run
2) It would probably pay you to bring the incomer into a metal-clad consumer unit anyway as that way you have something to make your armoured off to and also can run some ancillary sockets and lights in the outhouse more easily.

No, you don't need to provide upstream RCD protection to the cable, but personally I would install it onto a DP MCB rather than a single.
 
1 and 1/2 storeys? must be DIY as he's already demolished half the upstairs. :drool5:
 
It's taken me fifty years of saving to get out of the shoe box in the middle of the road. :D
 
MP: Shoe box?
TG: Aye.
MP: You were lucky. We lived for three months in a brown paper bag in a septic tank. We used to have to get up at six o'clock in the morning, clean the bag, eat a crust of stale bread, go to work down mill for fourteen hours a day week in-week out. When we got home, out Dad would thrash us to sleep with his belt!
GC: Luxury. We used to have to get out of the lake at three o'clock in the morning, clean the lake, eat a handful of hot gravel, go to work at the mill every day for tuppence a month, come home, and Dad would beat us around the head and neck with a broken bottle, if we were LUCKY!
 

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