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Garage changed to granny flat.

Jonomac

Hi there. 

I'm converting my garage to a granny flat. I have a TNCS system in our house. Supply to 100amp main switch in consumer unit, fed down to 2 main RCDs feeding 5 mcbs each. 

The board in the garage is exactly the same set up. What's the best way to feed the garage from the main consumer unit. If I wire into an MCB which is linked to the RCD. This would feed the main switch in the garage leading to other RCDs. Same trip characteristics both would trip. 

The supply to the garage is by means of SWA cable.

Any design solutions would be grateful.

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