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Old 10-13-2019, 08:39 AM   #1
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Melted Extension Cord

While using my 2 air conditioners and plugged into a 30í extension cord, the connection point melted the plug and outlet of the cords. The cords are 30A. Does anyone know why this would happen? Should I use a 50A extension cord?
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Old 10-13-2019, 08:49 AM   #2
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2 air conditioners along with the converter and other items in the RV are drawing near 30 amps.

The slightest corrosion on a 30 amp plug will start to generate enough heat to melt it.

If the option is available use a 50 amp cord and service, otherwise only one one air conditioner at a time.
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Old 10-13-2019, 08:55 AM   #3
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Yes, absolutely use a 50 amp extension if you have it. Any extension you use to run your RVs ACs should at the least be 'heavy duty'.

Is your RV a 50 amp?
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Old 10-13-2019, 08:55 AM   #4
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It's not clear exactly where the extension cord is. Is it between the RV and the power supply or inside the RV?
In any case, you are exceeding the capability of the extension cord to carry the current for two air conditioners, and you are managing to burn them up before the circuit breaker trips. Air conditioners draw a huge current, especially on start-up. Start learning the numbers on power breakers, your extension cord and your air conditioners. It's better than setting your rig on fire.
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Old 10-13-2019, 09:12 AM   #5
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Hi Full.Monte,
The coach came with one AC. We had another high efficiency AC installed and can run both from our 30amp service at home or any close AC pedestal. The 2 AC’s run lower than the 30amp breaker in the coach. The problem is when we use the extension cord.
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Old 10-13-2019, 09:14 AM   #6
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Thanks for the info. The coach is 30amp and the 2 AC’s run close to the max amp’s. I thought a 50amp extension cord might be better.
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Old 10-13-2019, 09:18 AM   #7
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Quote:
Originally Posted by Del92126 View Post
Hi Full.Monte,
The coach came with one AC. We had another high efficiency AC installed and can run both from our 30amp service at home or any close AC pedestal. The 2 ACís run lower than the 30amp breaker in the coach. The problem is when we use the extension cord.
Extension cords add resistance.
Corrosion and dirt make weak connections
Connections add resistance
Resistance with current running through it creates heat
The heat goes up by a factor of 4 when you double the current
Heat melts plastic and rubber

Does it make sense now?
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Old 10-13-2019, 09:43 AM   #8
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So is the extension cord lying on the wet grass perchance? Get rained on?
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Old 10-13-2019, 09:54 AM   #9
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A poor connection on any of the pins on a plug would cause this.
If you have to wiggle the plug ends to unplug them from each other the ground pin makes a poorer connection each time.
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Old 10-13-2019, 10:00 AM   #10
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You will need an 8ga extension cord to stop overheating
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Old 10-13-2019, 10:40 AM   #11
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Hi ! Welcome to IRV2! We're sure glad you joined the gang!

I would use a 50A extension cord!

Noticed you are kinda new on IRV2 and wanted to say hello!

Good luck, happy trails, and God bless!
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Old 10-13-2019, 10:30 PM   #12
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Quote:
Originally Posted by Del92126 View Post
Hi Full.Monte,
The coach came with one AC. We had another high efficiency AC installed and can run both from our 30amp service at home or any close AC pedestal. The 2 ACís run lower than the 30amp breaker in the coach. The problem is when we use the extension cord.

How long is the 30,amp extension cord?
Is it truly a 10 gauge cable?
What size is your coach, maybe time to upgrade to a 50 amp service.
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Old 10-14-2019, 09:19 AM   #13
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Quote:
Originally Posted by GMoore View Post
A poor connection on any of the pins on a plug would cause this.
If you have to wiggle the plug ends to unplug them from each other the ground pin makes a poorer connection each time.
And once it overheats it is never going to fix itself. New ends are needed. Do not use Camco 30A plugs as the pins are too short.
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