Quote Originally Posted by jdurand View Post
At least in the US there's a problem with using two relays, what if one sticks? You should have the two poles mechanically ties together so either they both go or neither (so you know there's a problem).
Sure - Re 2-poles: Of course they're preferable. I was commenting a post having a few 1-poles around -
and using two couldn't possibly be worse than just one, given any malfunction?

2-poles ARE less susceptible, but no guarantees are given even in the higher current ranges, as I showed here last fall:
Circuit breaker cutaway - photo

After my summer vacation with thunderstorms a few years back I realized some 35 % of all (70-ish) GFCI panel breakers had gone AWOL at work,
frozen in the (NOT kosher) ON state... The should trip OFF...
Darned things wouldn't trip under any tried methods...

Free tip: -Test by pressing the button of your GFCIs occasionally...
Also a fast check for incoming voltage at sub-panels; No voltage present, then no trip.

Good luck with your sell and move, jdurand!

Cheers
Johan