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Here’s a slick Canadian subpanel with a “generator interlock”. It is a normal 2-pole panel, just like common USA panels, and it’s Square D QO, which is common as dirt in the USA. However for the generator interlock, it uses 3-pole breakers (this series of panel is also made in a 3-phase version, so the 3-pole breakers are also common). The third pole switches neutral.

We often have applications here in the US where someone needs a generator interlock/transfer switch, and there are loads of things like this on the US market, but they are only 2-pole (no neutral). That won’t cut it, because they are coming off an inlet from a portable generator, and most portable generators have neutral-ground bonds, which means neutral must be switched. (the consumer can’t be counted on to install and remove the N-G bond every time he uses the generator).

This thing is both CSA and UL listed (CSA is a US Nationally Recognized Testing Lab) and actually made in the USA. So could I just pop across the Friendship Bridge, buy one in Home Depot.CA, and use it in Virginia? Or is that statutorially disallowed, and if so, by which Code cite?