Make sure you connect the sense wire to the right side
One (large) place where I worked had an automatic diesel generator set (ISO-container sized IIRC) set up to come on automatically on detecting loss of incoming mains, and off again once mains was restored.
I can't remember whether this was on a deliberate test, or a real mains failure, but the first time it detected loss of power and switched itself on... it immediately detected that the power was back, and switched itself off again.
Biting the hand that feeds IT
