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Old 10-07-2018, 06:58 PM   #1
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30 AMP to 50 AMP Adapter - Melted

What would cause the 50 AMP adapter, to plug the 30 AMP cord into 50 AMP service, to melt onto the 30 AMP cord? Photos attached.

Also, would this situation now render the 30 AMP cord as unsafe for use?
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Old 10-07-2018, 07:09 PM   #2
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Just going by the looks of the adapter plug photograph, it appear there may have been some corrosion going on, causing perhaps some resistance in the connection which can produce a significant amount of heat.
After inspecting the whole electrical cord and finding no other signs of damage I would probably purchase a replacement 30 amp plug for the end of the cord. In my opinion the adapter is no longer serviceable and needs to be replaced.

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Old 10-07-2018, 07:09 PM   #3
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Dirty, corroded or otherwise poor/loose connection. If the cord looks OK, clean up the connectors with some sandpaper. Definitely replace that adapter with a new, fresh, tight one. Then try again. Be wary of the old cord getting unusually warm near the plug end or the plug housing. If so, replace cord or at least replace the plug end of the cord.
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Old 10-07-2018, 07:11 PM   #4
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One cause could be a loose fitting connection. If you had to angle it or it was hanging awkwardly and didnít make a tight fit that could do it. I donít know whether the whole cable is shot but replacing the plug wouldnít be a bad idea - and Iíd replace the adapter too. Others with more experience will have better answers than this. Good luck!
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Old 10-07-2018, 07:18 PM   #5
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The insulation may be damaged for an inch or so into the cable from heat conducted through the copper wire. You will be able to see this. This will be heat damage; it shouldn't be over-current damage as your wire is rated for 30 amps and is protected by a 30A breaker in the trailer's power panel. Just cut the cord back far enough that the insulation is not discolored, put on a new plug, and get a new adapter.

I have had a similar problem with the yellow Camco plugs and sockets. I need to change my cable plug and the socket on my extension cable.

I'm looking for an alternate supplier.


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Old 10-07-2018, 07:21 PM   #6
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Any rain storms or sprinkler systems that may have given the connection a water bath?
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Old 10-07-2018, 07:22 PM   #7
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Heat and resistance possibly lose connection. We usually see it on the trailer side because of the L5 type plug not having enough metal to metal connection. Hence the invention of the Smartplug that has 20X more metal surface.
I too agree to put a new plug on the end of that cord.
Randy...Converters, Inverters, Trimetric, Surge Protectors, Zamp, Smartplug, AGM Batts
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Old 10-07-2018, 07:36 PM   #8
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Not mentioned but also part of your next steps - replace the adapter.
"Good judgement comes from experience. Experience comes from bad judgement."

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Old 10-07-2018, 07:59 PM   #9
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Thank you all for your assessment and recommendations. Sounds like I better replace the plug (at minimum) ... I may just purchase an entire new cord/plug. The 50 AMP adapter is definitely going in the trash.
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Old 10-07-2018, 08:03 PM   #10
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Errrr.... one other possibility ....

Turning on more than 30A of loads and hoping for the breaker to keep you ok. Breakers *do* wear out. Running ...umm... both AC's ... on a 30A circuit has indeed happened. Not that I'm confessing to anything ....

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Old 10-07-2018, 10:18 PM   #11
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Replace the 30 amp cord and the adapter. Time for a bit of dielectric grease...
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Old 10-08-2018, 10:39 AM   #12
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Dielectric grease

As Brick suggests, we learned from boating that dielectric grease really helps to reduce corrosion. A light coating on the male ends will work. The same is true for the TV umbilical.
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Old 10-08-2018, 11:04 AM   #13
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These adapters can cause a fire

I have been advised to never, ever use one of these adapters and they can cause a fire. I seldom use my "anaconda" (50 amp power cord). I just bought a 30 power cord and haven't looked back. My 30 amp cord has turned out to be the only one that I need to use.

A side note: it is a bitch to wind or fold up the the 50 amp cord after using it in cold weather. For me it has proven to be a wrestling match that I have begin to fear that that I might lose.
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Old 10-08-2018, 11:52 AM   #14
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Some of those style adapters have a warning tag about full time use/max load time.

"Chip Tank" is in Paso Robles Ca.
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