Hive Dual reciever & combi boiler

With many items we have a method to stop wrong devices being fitted, the GZ10 spot light has a right-angle, and GU10 a taper so you can fit GU10 into GZ10 holder, but not other way around, and the GU10L2 has a dimple in holder so only LED lamps will fit, although this now seems to be been abandoned.

But the programmer/thermostat back plate seems to be asking for errors to happen, specially when you can swap a volt free for a low voltage (230 volt) device without doing any rewiring.

They talk about all 230 volt for heating being taken from one circuit, then they do this, so on one hand accept people working on central heating have no idea what they are doing, then produce a back plate asking for mistakes to be made.

It does seem the idea of all being supplied from one circuit is a thing of the past, I see Nest very often the controller is supplied from a different supply to the base unit, fact that the 230 to 5 volt unit is independent to the controller is beside the point, we still have two independent circuits. But to be fair unlikely to cause problems as a result.

My router and the central heating are not on same circuit, but the wifi router is required for the central heating to work correctly. But to be fair the instructions say supply not circuit, and in most homes we only have one supply.

But however idiot proof we try to make things, we just find better idiots that can get around the protection, and we have to consider how far to take the protection, in the main if it requires a tool or a key to access, we assume the person working on it, knows what they are doing. Signs to say "This installation has wiring colours to two versions of BS 7671." should not really be required, if they don't know that, they should not be working on it.
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