I needed to add a circuit to my Murray 200A panel. The panel was installed 10 years ago. I purchased a Murray twin breaker from Lowes, and I installed in the panel with no problem.
Then I did some reading that most 40 ckt panels will not accept a twin breaker. And then I read the inside label of my panel, it did not indicate any twin breakers could be used
So now I'm confused. How was this twin breaker able to be installed? I thought these panels had provisions or interlocks that prevented these breakers form being installed?