> Even though almost all brands of breakers and panels are mechanically
> interchangeable, you have to match brands and products to be NEC
> compliant.
Around here, there are at least 3 major lines that are not compatible. Two
of them can be found in stores (one is Murray, I forget the other offhand,
maybe Square-D or GE). My 1968 addition was wired with a third type,
Federal Pacific.
Turns out that Federal Pacific cheated on their type acceptance tests, and
many of their breakers are faulty. Fortunately I asked a contractor friend
of mine where to buy them, and he clued me in. I replaced the entire
subpanel.
http://www.inspectapedia.com/fpe/reliance.htm
-- Randall
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