Hello,

I am wanting to run some cable down to an outbuilding that will be used as an office (4 double sockets, lights and some sort of heating) I understand I need 10mm armoured cable to be safe. However the power will be taken from my garage consumer box, which in turn is taken from the main board via 2.5mm armoured cable.

However surely if I use 10mm will that just be overkill if it’s essentially taken from the main board with 2.5mm?
 
Depending on the load and distance, 10mm or even 16mm may be required
It sounds like the garage distribution board is unlikely to be able to supply your requirements.
I would recommend you get a local electrician involved before you buy anything.
 

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If you're a qualified, trainee, or retired electrician - Which country is it that your work will be / is / was aimed at?
United Kingdom
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DIY or Homeowner (Perhaps seeking pro advice, or an electrician)

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Title
Running an additional armoured cable to outdoor building.
Prefix
UK 
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UK Electrical Forum
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Created
Gazza81288,
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James,
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