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Old 06-02-2011, 08:08 AM   #1
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Shore Power Cord Safety

I was told years ago that the 30amp/50amp RV shore power cord can heat up depending on the load on the cord, so I have always pulled all of my cord out of the TT housing, even if I don't need the total length. I don't coil the excess of cord on the ground either, I just snake it around.

The longer the cord, the potential for heat build-up increases do to the additional resistance. The setups that scare me are where a camper uses a smaller extension cord added to their RV shore line cord.

Be careful out there.



Bob
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Old 06-02-2011, 08:22 AM   #2
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Yup seen them go up in flames, 50 to 30 setup on my trailer, using too much power at the time, poor cord, washer dryer going and the airconditioning.

I get two years out of a power cord.
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Old 06-02-2011, 09:22 AM   #3
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Another reason for pulling out all the cord;
often the converter occupies the same space as the cord storage area. By pulling out all the cord, you are opening out more cooling space for the converter.
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Old 06-02-2011, 10:28 AM   #4
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Had never thought about this. Thanks
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Old 06-02-2011, 12:05 PM   #5
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Ok - I am starting to talk over my head here - but I had also understood that with A/C and coiling a cord it could cause some magnetic interference. Although I suspect this is somewhat small, I have enough of a difficulty using my cell phones or walkie talkies inside a big metal box there is no reason to make things worse.

Maybe it is this magnetic field that is created that also generates the heat? Dont know...but I always pull mine all the way out as I feel it is the safest way to operate.
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Old 06-02-2011, 12:31 PM   #6
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Some background info;
Every conductor has some amount of resistance to it. Larger diameter conductors have less resistance. The current squared times the resistance is the power lost in the conductor. This power loss shows up as heat. This formula is used to determine the recommended conductor gauge size for a given application. Thirty amp cables need to be 10 gauge or larger, to be safe to use in a confined area.

The metal sides of your trailer form a Faraday shield, which will impede the passage of radio signals, such as cell phone etc. The coiled 30 amp cable would have a very weak magnetic field, and not really a factor for cell phones, unless you hold the phone against the coiled cable.

Hope this helps with understanding.
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Old 06-02-2011, 05:58 PM   #7
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Haha...yeah...my wife always looks at me strange when I get frustrated at the signal and I tell her I am in a Faraday Cage - she has no idea what that means but knows it is not good! The field is probably weak, but given my cell phone usually is too...every little bit helps...lol....it also cant be good for that Jensen radio which as well all know has such great reception..
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Old 06-02-2011, 06:22 PM   #8
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I must say this is something I never considered and have always pulled out only what was necessary. I guess I will pull it all they way out from now on to be safe. When hooked to shore power just to keep up the battery, not running much, would it still be necessary to pull it out?
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Old 06-02-2011, 06:51 PM   #9
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I once had a retractable extension cord hooked up to a battery charger without pulling it out all the way. After seeing it catch fire I always pull my camper cord all the way out & let it snake out on the ground.
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Old 06-02-2011, 07:02 PM   #10
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Quote:
Originally Posted by Crabman View Post
snip......When hooked to shore power just to keep up the battery, not running much, would it still be necessary to pull it out?
Lee,

IMO if the only load on the 30amp cord is the TT battery charger (converter/charger), I wouldn't think this would be a potential heat issue.

But remember, I'm more comfortable with grease, wrenches, and sludge hammers!

Bob
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