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I was told by a city inspector that a single-throw switch is required after the utility meter, within a certain distance (3-5ft?), and before any breaker box.
Such would allow safe conditions when working on sub-boxes.
Residential house.
(However your city code might not require this.)
I've been told breakers can get soft and trip easy, but wholly second the advice of testing amp draw first and using an electrician for an hour.
The wiring could be undersized, breaker bad, or machine drawing too much juice.
You don't have time for a house fire.....
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