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Old 06-30-2016, 02:46 PM   #11
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Thanks folks, if there is no concern about daisy chaining 2 extensions then I can do either.
Just make sure the connection between cords doesn't end up lying in a puddle if it rains.

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Think I'll go see if I can find a 50' 12, it'll work for either. I would feel better being on the 20. Too bad the shade is better near the 15a.
Makes sense to me. To set expectations, this is probably the bottom end of the price range (different ends, name brands, and other retailers all lead to higher prices): 15 m 12/3 Single End Contractor Grade Extension Cord (of course prices will be lower in the U.S.; for context, Princess Auto is a low-priced chain).
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Old 06-30-2016, 03:21 PM   #12
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Ended up with this one. Got it at one of the few remaining mom and pop hardware stores. Sometimes convenience overrides price.

https://www.amazon.com/Yellow-Jacket...n%3A4459667011
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Old 06-30-2016, 03:31 PM   #13
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Last year at the Mississippi River Rendezvous, Iowa Dave warned me about the adapters that convert the 30 amp plug to a 15 amp. Is that something to be concerned about in this scenario?
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Old 06-30-2016, 03:43 PM   #14
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Last year at the Mississippi River Rendezvous, Iowa Dave warned me about the adapters that convert the 30 amp plug to a 15 amp. Is that something to be concerned about in this scenario?
You didn't say what the issue was, but guessing it could melt if you went much over 15a. I can check the temp of the connector with the AC running for a while and see if it gets hot. Really shouldn't be pulling anything over 15. Thanks for the heads up.
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Old 06-30-2016, 04:02 PM   #15
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Bob, I am a bit concerned with what you are proposing. The distances you have mentioned are somewhat long. 30amp RV cords are 10 gauge because they are 25-30 feet long. If they were longer, they would be heavier. I think you mentioned 70 feet. Over that distance you will have voltage drop. I would strongly advise you to consult a licensed electrician. Even 70 feet on a 30 amp circuit would be better wired with 8 gauge wire rather than 10 gauge. There are charts on the net that indicate what sized wire should be used for given amperage and given distances.
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Old 06-30-2016, 04:24 PM   #16
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Worse comes to worse his EMS should cut in if the voltage gets damaging low.
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Old 06-30-2016, 04:41 PM   #17
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Last year at the Mississippi River Rendezvous, Iowa Dave warned me about the adapters that convert the 30 amp plug to a 15 amp. Is that something to be concerned about in this scenario?
There is a bit of concern if you were connecting a 30A supply with a cord rated at 15A, as the cord would be the weak link, and not the breaker which is supposed to provide protection.

If Bob is using cords rated for 20A which the circuit is fused at, then there is no problem. Any draw too high would not harm the cord, but instead trip the breaker.
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Old 06-30-2016, 06:00 PM   #18
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There is a bit of concern if you were connecting a 30A supply with a cord rated at 15A, as the cord would be the weak link, and not the breaker which is supposed to provide protection.

If Bob is using cords rated for 20A which the circuit is fused at, then there is no problem. Any draw too high would not harm the cord, but instead trip the breaker.
I agree... although if one used a light cord (less than 12 gauge) in a 20-amp outlet, then the cord could be overloaded without tripping the breaker. Knowing that the trailer has a 30-amp breaker, I would be reluctant to use a 14-gauge cord to a 20-amp outlet. Bob is set because he has a 12-gauge cord.
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Old 06-30-2016, 06:10 PM   #19
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Bob, I am a bit concerned with what you are proposing. The distances you have mentioned are somewhat long. 30amp RV cords are 10 gauge because they are 25-30 feet long. If they were longer, they would be heavier. I think you mentioned 70 feet. Over that distance you will have voltage drop. I would strongly advise you to consult a licensed electrician. Even 70 feet on a 30 amp circuit would be better wired with 8 gauge wire rather than 10 gauge. There are charts on the net that indicate what sized wire should be used for given amperage and given distances.
I agree that this is a valid concern, but I think that 30 amp RV cords are 10 gauge because they carry 30 amps (over any distance), not because they are 25-30 feet long; longer 30-amp RV cords (such as the one I linked earlier, at 50 feet) are still 10 gauge. The wiring through the house can be much longer than 30 feet, and my guess is that the wire sizes are still 14 ga for 15A, 12 ga for 20A, and 10 ga for 30 amps.

There are 8 gauge RV cords, but they are rated for 50 amp service.

Safe current-carrying capacity and adequate gauge to produce acceptable voltage loss are separate (although related because the both involve resistance) issues. If the distance is long enough, keeping voltage loss down may call for larger gauge than required for safe current capacity. So yes, a 10-ga extension would be even better, but I haven't run the numbers to see the difference would be of any significance. In Bob's scenario, I would use the 12-ga extension, and perhaps check the voltage with the air conditioner running.

One more twist: don't coil up any extra cord length in a pile. At high current, it can overheat that way - ratings assume that the cord is laying in an open area by itself, not piled up with more hot cable.
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