If you're going to set up something so you can switch a load(s) between the power company and a generator, you need a transfer switch that is CSA or UL listed & labelled and it must be installed in accordance with the NEC (or CEC). Doing otherwise can create a serious safety hazard not only for a user but also the utility co. working on their equip. (You can't ever use an ordinary double pole switch).
If you are referring to my use of the DPDT description; This installation was done by a licensed contractor who purchased a permit and had it inspected. The switching device is four breakers with a mechanical interlock which closes two breakers when it opens the other two. Maybe my DPDT description was misunderstood.
