According to Mark Rand :

Has everybody missed the point that fitting proper interlocks is _precisely_
what Iggy is proposing to do? OK he's not buying a nice idiot homeowner retail
kit from home-generators_R_us. He is engineering a solution that is at least
as foolproof and effective. Good luck to him!

It doesn't appear to have enough poles to be effective - it doesn't
switch both sides of the panel. Secondly, it's probably not
approved for the purpose of switching residential feeds, and there
may well be a reason why it wouldn't be.

To do it right is to do it within the NEC (or CEC) with devices
UL or CSA-approved for the purpose, or be able to find an electrical
engineer who is willing to sign off on it.
--
Chris Lewis,

Age and Treachery will Triumph over Youth and Skill
It's not just anyone who gets a Starship Cruiser class named after them.