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Thanks. Need only wet my fingers now to see which one left is neutral!!!

I want to replace the existing old Satchwell room stat with a new digital. The Horstman is a 2 wire set-up according to all I have read but the existing Satchwell is a three wire excluding earth. C/H boiler is an old Gloworm gas floor mounted on a 2 pump system, 1 C/H 1 H/W. Programmer on...

Whoops I meant one Cu for the off peak and the other for 24 hour supply part of which is split into RCCD protection for Shower and Ring Mains, and the rest, Lighting, Cooker ,Immersor o outwith the RCCD protection. Does this sound much more the norm??

Thanks Plugwash for the reply. Perhaps we should look at having two seperate CU's with the circuits needing RCCD additional protection in the other. A notice is NOT on the unit but will be NOW!!

We have bought a house which has a 2/3 year old ‘new’ GE consumer unit. It has either an 80A or a 100A DP main switch protecting the off-peak supplies, which are 3 x1.7KW storage heaters and 2 x.85 storage heaters plus an off peak immersor for a hot water cylinder and all 5 are all on...