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Old 08-16-2013, 03:30 PM   #15
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Update, the buss bar was damaged due to the heat of the wires getting hot. We will have to replace the box.
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Old 08-16-2013, 03:49 PM   #16
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You might want to check Amazon theY had one for a hundred twentY two and change
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Old 08-17-2013, 05:58 AM   #17
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I just have a couple questions I'd like to ask about your transfer box. Was the main one Wire that melted White neutral Wire. Also have you been running you're both air conditioners on 30 amp service. Have you a way of monitoring your voltage whether you had low voltage or not coming into the motorhome. I'm just trying to pinpoint what made the transfer box get so hot. It would seem that there has to be some reason why those wIres melted as all my lugs were tight.
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Old 08-17-2013, 07:21 AM   #18
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Billy, We have a basement air conditioner and an EMS that controls what can be powered if we are using 30 amp power.
I don't monitor shore line voltage but I probably should.
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Old 08-22-2013, 06:59 AM   #19
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Quote:
Originally Posted by Magumba View Post
Our Onan 5500 stopped powering the camper yesterday but still ran ok. I opened the transfer switch today and found the neutral and aux wires from the generator badly burned and broken off at the buss bar.
Yikes, thank God we didn't have a fire. The wires look pretty light compared to the shore line wires.
Had the same thing happen to me and when checking found all the screws loose.
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Old 08-22-2013, 07:37 AM   #20
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Usually when screws are loose on a loaded conductor wire it will arc until it usually welds together causing some heat between wire and screw end right at the screw tie in , and not 2 inches back from screw connection , when wire coating and copper are melted so far back from connection you could have an overloaded circuit coming off that leg, you might want to amp load that circuit with everything on including both air conditioners on and see what it is pulling for your wire size.

Your automatic transfer switch has a step transformer inside of it that also could be the cause of the burnt/melted wire.

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Old 08-22-2013, 07:56 AM   #21
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One thing I did see was the set screw that hOld the wire fOr the neutral line was actually galled on the threads to the aluminum block where the wires are tied together. I had to chase the threads to clean them up.
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