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Old 10-08-2013, 08:58 AM   #16
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Breaker popped


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Originally Posted by carmusic View Post
ok... a breaker is made for that, not for eveyday but once wont kill it. if it was the case we would just use fuse like before
circuit breakers are rated for thousands of mechanical operations (i.e. manually turning it off and on) but only a handful for short-circuit trips (2 or 3). it is a function of the magnitude of the fault current which varies with fault current available from the utility, impedance of the circuit (i.e. is it short or long), etc. the breaker could withstand more than 2 or 3. breakers can handle dozens of overload trips but if one is having frequent overload trips, something is wrong.

you could always have a lab test the breaker but what does a 40 amp breaker cost, $10? for something as large as an oven, i would probably replace it after a single short-circuit fault.

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Old 10-08-2013, 09:12 AM   #17
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Breaker popped


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Originally Posted by carmusic View Post
ok... a breaker is made for that, not for eveyday but once wont kill it. if it was the case we would just use fuse like before

As noted once can kill it and the cost of replacement is minimal compared to the possible ramifications.

I have pictures of large frame molded case circuit breakers built to a tougher standard that were closed into a fault, burns, and burns are never fun.

And while we are discussing 240/120 (not 480/277) a burn is a burn, why risk it?
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Old 10-08-2013, 10:10 AM   #18
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Breaker popped


a 120/240v house supply doesnt have a high s/c current possibility (typically under 5ka it is just fed by a 25-50 kva transformer), nothing to do with 480/277 supply that can have 200ka capacity

why are we talking burn, his breaker just popped, it does not exploded
a burned breaker would simply not work anymore it would not stay to on position anymore
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Old 10-08-2013, 10:50 AM   #19
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Breaker popped


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Originally Posted by carmusic View Post
a 120/240v house supply doesnt have a high s/c current possibility (typically under 5ka it is just fed by a 25-50 kva transformer), nothing to do with 480/277 supply that can have 200ka capacity

why are we talking burn, his breaker just popped, it does not exploded
a burned breaker would simply not work anymore it would not stay to on position anymore
the issue is that if a breaker sees a sufficient number of short-circuit interruptions, it fails. the next short-circuit won't be interrupted and the breaker can arc, explode, burn, etc. don't get me wrong, this hardly ever happens in a home, where a breaker sees so many short circuits of sufficient amperage that it can fail but it is a concern. yes, a home will likely see low fault current but those home breakers are also only rated 10 ka.

bottom line is that if i had a breaker that popped 2 or 3 times on short circuit, i would replace it.
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Old 10-08-2013, 01:02 PM   #20
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Breaker popped


Quote:
Originally Posted by carmusic View Post
a 120/240v house supply doesnt have a high s/c current possibility (typically under 5ka it is just fed by a 25-50 kva transformer), nothing to do with 480/277 supply that can have 200ka capacity

why are we talking burn, his breaker just popped, it does not exploded
a burned breaker would simply not work anymore it would not stay to on position anymore
They do explode, and very well could stay closed.

Residential CB's are not 200,000 AIC. And while I agree with your evaluation that a 240/120 VAC residential service MAY NOT have sufficient AIC to cause extreme damage, but you and I are sitting behind a keyboard off site and HAVE NO CLUE. So based on that I will stand by my suggestion that the CB be replaced.

Have you ever seen the aftermath of a circuit breaker exploding, ever been involved in returning a service to operational condition after someone turned on a faulted circuit breaker. It can be a mess and the operator can be hurt.

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