In article , David Looser
wrote:

Had you thought about simply hard-wiring the two units together? then
the problem vanishes. Or if you *must* use a plug & socket make it
impossible to remove it without unplugging the mains first. I really do
think that you are likely to end up with an electrical interlock system
that is so complex, and based on potentially unreliable components, as
to fail to provide the safety that is supposedly your aim.

I also worry about that. The more complex the system is - particularly when
physical items like relays and plugs/sockets are involved - the more
failure modes and sources of failure there will be.

TBH it still seems safer as well as simpler (and cheaper) to me to just fit
appropriate forms of connectors and use a protection diode and bleeds to
the destination. Safer because the number of items present has been
reduced, and no mechanical sensing is involved.

Slainte,

Jim

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