Some of the panel makers make them. Square D makes them for their Q0
panels and I think they now have them for their Homeline panels. Others
also have them.

Google "generator interlock kit" or see http://www.interlockkit.com/

On Mon, 08 Sep 2008 07:38:29 -0500, Caesar Romano wrote:

On Sun, 07 Sep 2008 22:05:03 -0400, wrote Re Code
question on generator grounding:

That breaker
has a mechanical interlock which prevents both it and the main breaker
being on at the same time. (It is impossible to turn on the backfeed
breaker on unless the main is off, and impossible to turn the main breaker
on unless the backfeed breaker is off.)

Where do you get such an interlock? Do you have a product name &
manufacturer? Even better, do you have a link?

Thanks