We had one in our old house, probably installed in about 1970 as a rewiring
job (by an electrician who had every outlet except one in the whole house
polarized backwards....).
I replaced 4 or 5 of those expensive little breakers because they went bad,
and swore I'd never have another of those Pushmatic damn panels.
Our 100 amp single-phase ITE panel had a main breaker - also a regular
Pushmatic of course. But it's not necessary to shut off the main just to
change a breaker - the screws are captive in the breaker so you have no
reason to touch them. Hold the breaker by the body to put it in place and
use a regular insulated handle screwdriver to run the screws in.
I don't remember ever replacing any other type of breaker in a home panel
because it failed. Maybe once or twice in industrial plants, but I really
don't recall.
Karl
> Snip
>>
>> The only problem is that all the 220-volt breakers
>> would have to be replaced hot, and be unscrewed and
>> screwed to the hot bus bars instead of simply being
>> plugged in. And with no master disconnect or
>> overcurrent protection, I would be afraid to try that
>> myself!
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