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Thanks for the tip Andy. Ban_all_sheds, I'm a newly qual plumber so no doubt I will be trying to learn all I can electric wise as it is all linked! John, it's a b20 proteus MCB not RCD. The RCD covering that side of the CU is 63a rated. Not sure if you meant to type mcb or if this...

It would help if I knew how to copy/paste from an iPhone.. Ok John, so I'm taking that you have said no FCU would be needed if it was a ring circuit with a 20 amp breaker because 2.5mm can handle 20 amps? But if I had a 32amp breaker (which I dont) then I would need an FCU to run the 3...

Many thanks to you two guys, I think I've got a plan. Wether it's a ring or radial, I'm going to need the 5 amp SFCU in place for the lighting circuit. As for the 13 amp FCU feeding the 3 proposed sockets and the 5 amp SFCU, I'll keep that also as if the circuit is a radial it isn't needed...

I just read that 20 amp mcb ring circuits do exist where cabling has been run through insulation... I've got too much spare time today haha. Erm there was a plan for 1 freezer.. This would be a problem?

"It's all RCD protected at the CU" meant to type.

Thanks for the replies, it is all dc'd protected at the CU. There are 2 singles and 8 double sockets in total, including the socket in the garage on this circuit, + the 3 tube lights in the garage. All this is from a 20a mcb on the CU which I thought would point to it being a radial circuit...

Hi guys, I'm trying to extend what lighting/sockets I have in my garage. Currently I have a 2.5 t&e coming through the brick to what feeds 1 double socket and 3 tubelights. I'm not sure wether this is spurred off a ring main or is part of a radial circuit from the house. Anyway I want to add...

Proposed garage

Current garage

garage pics