I thought I saw a post here a little while back about the Square D kit that interlocks a 100A main QO breaker with a 30A backfed generator breaker, but I can't seem to find it.....
Does anyone have a part no.? I looked in the Digest, and couldn't find it there either...
I have never used or seen the interlock kit that Ron posted but they also make an interlock that mounts over two 2-pole QO breakers mounted next to each other in a loadcenter. It also secures both breakers as required for back feed applications.