At first I thought, eek!!, about the power coming on after a power cut and not being there, then I thought about the previous topic of key card system, which can help elimate this, especially if you are renting and the renters don't do the trip switch thing.
prev discussion here:-
{A Link to an old CBF topic was here - no longer available}4003&SearchTerms=key,card,system
{A Link to an old CBF topic was here - no longer available}3678&whichpage=2&SearchTerms=key%2Ccard%2Csystem
Dipps