the snooper
getting older by the day
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Still hypothetically speaking you could actually make a contraption like that a safe device to use if one plug was removed. All you would need to do is fit a couple of 240v relays/contactors that disconect the circuit if either plug is out.
i think you may find that hard to do as once both relays were operated and you pulled 1 plug the feed from the other plug would latch the second relay, it would be possible using dc and diodes