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Thanks for your quick reply. My Nest thermostat will be powered by its own power cable that I bought separately. Once again, thank you for your input.

Hi, I have a similar query regarding the same istallation although I seem to have less cables to contend with. From the attached photo, I have one 4-core cable entering the R6660D from a fused (3 amp) switch. These lead into terminals N + L and also terminal B with a red "loop" joining...