Good question. I think the reasoning is that there will be parts that are live that are reasonably expected not to be, even with the protective device switched off or the fuse removed. Whether this is classed as immediate danger seems to be open to interpretation.
David Savery put out a video on YouTube about SBS going out of business. In it, he does make some interesting points about (most) other manufacturers effectively discontinuing products by not making them backwards compatible.
There is no reason for an item of fixed equipment to be on its own dedicated circuit just because it is fixed equipment. There may be other reasons though, such as manufacturer instructions, special location equipment such as EV chargers etc, and also design considerations such as the...
I think you would find the code of practice for EV a worthwhile read (if you haven't already). For one thing, it points to the regulation that says each EV charge point should be protected INDIVIDUALLY by an RCD, thus ruling out the existing consumer unit setup, as the RCD main switch also...
Yes it would work, if all you to want do is override the PIR to make the light come on with the switch. Obviously you would not be able to switch the light off with the switch using this configuration.
The range is pretty good in my experience.
Dry contacts or voltage free contacts is correct.
The ones you linked to would do the job.
These ones are well known and highly recommended -
https://www.shelly.com/en-us/products/shop/shelly-1-mini-gen3
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