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Old 07-24-2013, 09:41 PM   #1
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Surge Guard 34730 problem

I have a Surge Guard model 34730. Yesterday we suddenly lost all power in the coach. The single air conditioner was the only power draw on at the time. All breakers were untripped, however the Surge Guard had a burned right side female slot. Actually, the shore cord male was fused to the female Surge Guard receptacle. I have replaced the shore cord male end and am plugged in to shore power sans the Surge Guard. All seems well with the coach. I am afraid to fix the S/G female plug and intend to call S/G tomorrow. My question to the forum is what would burn the plug out. The S/G showed that the pedestal was good when I plugged in. I suspect too much amp draw.

Any ideas from the electricians out there....
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Old 07-25-2013, 03:43 AM   #2
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Loose connections will cause arching, heat and eventually burnt parts. Try to keep the plug/receptacle connections as tight as possible. Loose connection problems are exacerbated with higher amperage draws.
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Old 07-25-2013, 06:40 AM   #3
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To much "amp draw" would cause the circuit breaker to pop or fuse to blow.
Mike is correct with "a poor connection".
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Old 07-25-2013, 05:02 PM   #4
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Loose connections create resistance, resistance creates heat, more heat creates more resistance and eventually a heat based failure, aka the connection burns... because it is a resistance/heat event no circuit breakers pop!! Keep your connections tight!!
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Old 07-25-2013, 10:55 PM   #5
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Thanks for the replies....The connection which burned/shorted was very tight. Original marine lock at coach wall, molded plugs both ends. Supply end connected to the TRC Surge Guard. External connections were good. I am wondering if the loose connection is inside the Surge Guard. I cut off the burnt end of the supply cord and cut it open to inspect the blade connection to the wiring and it was ok. The blade slot in the Guard is melted on the outside. I'm thinking the real problem is inside the TRC Guard but I won't know unless TRC refuses to warranty. If they do, I will break it open and see if I am right. If so I'll post result....Thanks
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Old 07-26-2013, 12:44 AM   #6
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Sure hope you can find out why that happened. We all could use a little education as to why it happened. Give us the final results of this case..
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Old 07-26-2013, 05:28 AM   #7
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My 40 years of experience indicates the burning takes place where the "resistance" is located... if the issue was inside the surge protector, that's where the burning would have occurred. The issue may have been oxidation on oxidation creating the thermal buildup.
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