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Wiring a garden building

MikeD

I will be building a garden office shortly. It will be 5 metres from the house and I'd like advice on the supply cable please.

I think I have two options:

Run 15 metres of 2.5mm2 SWA from the consumer unit in the house to the CU in the garden building

Run 5 metres 2.5mm2 SWA from the garden building to a Wiska box on the house wall then 10 metres of 4mm2 T+E to the house CU

Are there any strong reasons for choosing one or the other? Is it practical to connect SWA to a consumer unit?

Thanks,

Mike

 

Parents
  • 0

    Because it's rated at 30 amps and should be adequate for my current load estimate:

    Be careful - that's the 90-degree rating, if you're connecting to domestic style accessories CUs etc) you'll be limited to a 70 degree maximum - so will have to de-rate (or use the 70 degree tables). There's also a de-rating factor for cables buried in the ground for overload protection (0.9).

    You may well be OK for a 20A circuit still - but you really should have the calculations to prove it if you're signing off for the design as well as the installation.

       - Andy.

Reply
  • 0

    Because it's rated at 30 amps and should be adequate for my current load estimate:

    Be careful - that's the 90-degree rating, if you're connecting to domestic style accessories CUs etc) you'll be limited to a 70 degree maximum - so will have to de-rate (or use the 70 degree tables). There's also a de-rating factor for cables buried in the ground for overload protection (0.9).

    You may well be OK for a 20A circuit still - but you really should have the calculations to prove it if you're signing off for the design as well as the installation.

       - Andy.

Children
  • 0 in reply to AJJewsbury

    Thanks Andy, that's filled another gap in my knowledge!

    Mike

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