Be advised you cannot always rely on the rating marked on circuit breakers.
A number of years ago we went through and tested all the breakers for a local school's electronics lab.
Every bench had it's own breaker as well as for each office and the lights and a couple of peripheral circuits.
Over 90% of the breakers were out of spec on the high side. Most 20 amp breakers were delivering almost 30 amps and some were still not tripping despite delivering almost 40 amps of current. Most of the 15 amp breakers delivered between 18 and 22 amps before tripping. None of the breakers was more than five years old and a number were brand new.
Can one say insurance?
Note also that 115v is only nominal as the "standard range" is 110-120v. In most cases it is usually closer to the 120v and can be as high as 125v.
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