Common sense

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Esthy

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Those Mobile homes that I am taking care now, have on their furnaces, besides the breaker disconnect at the service panel, breakers mounted on the furnaces as 100 amps, 90 amps, 60 amps, etc., the one in the photo is a 60 amps and it shows 3 conductors in one phase and 4 conductors in the other phase, those conductor are for the 24 transformer, for the sequencers and other.

BUT, I am not comfortable with those small wires (12/14) going to those breakers. I know the manufacturer specified them, but then why most of those wires burned out without tripping the breaker (disconnect?)? I already replaced burned out wires in 3 furnaces.

Of course your professional input is greatly appreciated
 
This was common practice by manufacturers to place multiple conductors in the breaker lug - they can get away with it with their listing though. They also get away with smaller conductors with high overcurrent protection with their listing, though there is usually secondary protection on the transformer as well as overload protection in the blower motors - so the conductors are still protected from overload and the breaker provides short circuit and ground fault protection.

Your burned wires were probably the result of a weak connection, current level never reached overcurrent conditions, yet the resistance of the weak connection creates a lot of heat when current is passing through it.
 
Esthy said:
APridham
Moderated Member
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What this means?
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I think it means the member made a comment that was not appropriate, not related or it was an advertisement. So one of the moderators removed his comment.
 
Ok. I was told that Penatrox cannot be used in furnaces because of the excessive heat there. Is that correct?
 
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