Hot temp on one of buss bar-100A service panel

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Old 05-27-09, 10:29 AM
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Hot temp on one of buss bar-100A service panel

Changing out 15A circuit breaker, found one of the buss bars very hot. Without connecting lead, contacts on breaker are very hot...The other buss bar is normal temp. Possible cause?
 
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Old 05-27-09, 10:47 AM
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What's "very hot"? Normal operation can be warm to the touch (up to about 110F).

If it is above normal, then it is caused by a loose connection between a breaker and the panel or sometimes at the main breaker. It can also be from a corroded connection. It should be investigated and repaired or replaced soon.

What is the make/model of the panel? Do you notice any signs of damage, burning smell, popping noises or dimming/flickering lights?
 
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Old 05-27-09, 02:08 PM
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Thanks for response...
I'll have to check brand & etc. A lot more breakers on buss side that's much hotter. Would load unbalance contribute
to problem? I'll measure some currents too.
 
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Old 05-27-09, 02:34 PM
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It could cause it to be warmer if there's more load on one side than the other, but the main breaker should trip if the current reaches an unsafe level. Excessive heat is usually created from arcing, not overcurrent.

Of course a stuck main breaker could allow too much current, but unlikely enough to cause a lot of overheating.
 
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Old 05-29-09, 04:02 PM
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100A breaker is Siemens EQ9675. There is a small red plastic tab of side....Is this a lock of some kine? Tried to pull out but still couldn't pull breaker off buss bar?? I measured 60 and 40 amps on feed to breaker. Don't think this difference is enough unbalance to be concerned about? Could a defective breaker act as bad connection to cause buss bar to heat up? Comments please
 
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Old 05-29-09, 11:36 PM
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That red tab useally not removeable very easy and they used that on the main breaker appactions espcally with some MLO breaker box they do that all the time and per NEC code we have to have lockdown the main breaker to prevent removing.

Techally wise it can be remove but the power supply MUST be off by calling the POCO or qualified electrician to deal with this.

This is one of few area the average DIY should not mess around with main breakers due unfused conductors from meter box to the main breaker if something short out it will result a pretty nice arc flash and can end up destory the breaker box and really hurt someone in the way.

60 amp on one line and 40 amp on other line is fine it will feel little warm but nothing out of line if everything is good shape but with corroded or burnted bussbar that can really raise the issue.

If you wiggle the breaker if feel very loose that can indentication of bunted bussbar or overheat that can cause more issue down the road.

Merci,Marc
 
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