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Old 07-25-2011, 10:11 PM   #1
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Generator Blows breakers

Had generator working with AC on traveling in the 105 F heat this weekend. Generator blew Circuit breaker after about 45 min, frig also on. got home sat in driveway for 20 min with both AC units running. Did not trip breakers? Is it possible that during travel something is drawing more current, like loose wire, etc. vs sitting still?? Any Ideas are welcomed< thanks Nazoomer
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Old 07-26-2011, 07:07 AM   #2
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A hard jolt or bump can trip a circut breaker even if it doesn't have current running through it. While under load a breaker is more apt to trip if it gets jarred. This was happening to us til the original A/C breakers were replaced. Household breakers in a house bouncing down bad roads, Is it any wonder why they dont all trip all the time!
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Old 07-26-2011, 07:53 AM   #3
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Circuit breakers are manufactured for a particular rating at 40 degrees C(104 F), beyond that the capacity is de-rated. At an ambient temperature of 105 F it is not unheard of to get road surface temperatures of 140 F or more. With the circuit breaker located in an enclosed generator housing and with the generator running, temperatures in the housing can easily get to 140 150 deg. F. At those temperatures a 60 amp breaker is de-rated to 52 amps or a 40 amp breaker de-rated to 34 amps.
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Old 07-26-2011, 08:37 PM   #4
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So a 30amp is gonna be far less!! Makes sense! thanks for the comment. nazoomer
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