Don,
I realize that most manufactures only want their breakers in their own panels. I can also accept the fact that Cutler Hammer tpye "BR" breakers are UL listed for use in many panels. However when I fail a job, I usually give the contractor a choice, I tell him that either he has to prove to me that the breaker is listed for that panel or else he will have to use a breaker from the same manufacture of the panel. I have yet to see a Square D breaker listed for for a Siemans breaker. It may be out there, and everyday something else new comes along, but who knows?
