Looking at Sundial C plan, is a 1.5mm T&E protected by a 6 A MCBO ok from consumer unit to Honeywell junction board? Will have a 3 amp fused switch as per boiler and controller documentation. I'm assuming because it is fused at 3 amp, no real need for 2.5mm cable and 16 amp RCBO
That'll work, I have a condensing combi three zone system with the Nest thermostat - That is all run off a 10a RCBO and 1.5mm cable and a 3a fuse at the FCU The 16a and 2.5mm is usually for when an immersion heater is fitted.
So maybe run 2.5mm and 16A run to a 20amp double pole isolator switch that way i could fit emersion if required i guess at later date
You need a fused connection unit with a 3 amp fuse for your boiler and controls. You could run a radial from a 20amp RCBO with the fcu for boiler and 20 amp double pole switch for immersion heater, although I like to keep immersion on its own circuit.
Ok going to run 2 x 2.5mm T&E one for immersion and one for controls, both on isolation switches both on own RCBO. Got it all covered then
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