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Old 05-18-2008, 06:35 AM   #1
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Excuse my very limited knowledge of the electical issues...but if you are at a park with only 30 amp plugs...and nobody is sharing the space next to you...is there such an adapter that allows you to plug two 30 amp plugs into one 50 amp? Like a Y-cord.

Assuming the park allows it...is this doable from an electrical stand-point?

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Old 05-18-2008, 07:05 AM   #2
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Hi Eusefull,
Go here to see one choice to do what you want. I have this device and it works as advertised. I would make the purchase again.

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Old 05-18-2008, 11:30 AM   #3
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I checked that link, and there are a few problems with those, though theoretically they would work. If both of the 30 amp receptacles are on the same phase or leg, overheating the neutral conductor in the motor home power cord is possible, (2 X 30 = 60 amps on the neutral wire) Also you do not have the full 50 amps available, as you are limited to 30 amps per leg. You do gain an additional 30 amps of power over the use of a single leg 30 amp service though, which will allow you to run more stuff. Just use it with prudence and you should be fine.
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Old 05-18-2008, 01:38 PM   #4
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I have the CW device described. Although it can and does work as described, it will not work on any CG source protected with GFI circuit breakers.
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Old 05-18-2008, 03:08 PM   #5
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Note also that if you plug into an additional 30A outlet at an adjacent site , the campground might charge you for the additional site. Or an extra electric charge.
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Old 05-20-2008, 04:28 PM   #6
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Here's my 2 cents..
As stated by 'hillbilly2' "overheating the neutral conductor in the motor home power cord is possible, (2 X 30 = 60 amps on the neutral wire" that can't be. The reason is on a standard 5o amp plug you have 50 amps on two LEGS, each leg is isolated from each other. If Hillbilly2 is correct the 50 amp plug would be 2x50= 100 amps on the neutral.
When you use a 30 amp adapter cord with a 50 amp plug, you are applying 30 amps across the two legs, this setup limits the useage to 30 amps total.
Your intended setup would work only limited to 30 amps per leg.
now that is clear as mudd... lol
what ever it takes.....

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Old 05-20-2008, 04:39 PM   #7
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Scratch & Goose:
If Hillbilly2 is correct the 50 amp plug would be 2x50= 100 amps on the neutral. </div></BLOCKQUOTE>
The 2 each hot legs in true 50 amp service are 180 degrees out of phase. This makes the neutral current subtractive, not additive. For example, if one leg were drawing 40 amps and the other 30 amps, the neutral current would be 40 - 30 = 10 amps. If both legs were drawing 50 amps, neutral current would be zero. The maximum allowable neutral current in true 50 amp service would be 50 - 0 = 50 amps, same as the hot legs. Therefore, if a 60 amp neutral current were produced on a 30 amp x 2 cheater, this would indeed be a neutral overload situation.

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Old 05-20-2008, 07:42 PM   #8
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Eusefull.....This happens everytime this comes up. Several knowledgeable people will start talking voltage on this leg and voltage on that leg and it becomes an argument on whose right on what phase the power was operating. You also wil get people that tell you the campground will charge more or throw you out. That may be true, but have never seen or heard of that happening.

I have the Camping World model and have used it every year at boating park we go to. Weather hits a 100 degrees and one A/C is insufficient. By adding the "Y" I pick up enough power to run both A/C's but nothing else. It runs both A/C units until we come back to camp and then I start shutting one or the other down as we use other large draw items. I also monitor my voltage and it hasn't dropped to dangerous levels.

They're correct, it's not true 50 amp service, but it's enough to run two A/C's. If you manage your energy you'll do fine.
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Old 05-21-2008, 04:38 PM   #9
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content"> If Hillbilly2 is correct the 50 amp plug would be 2x50= 100 amps on the neutral. </div></BLOCKQUOTE> The 50 amp plug is pulling from two different phases (providing it was wired correctly, if not you will have 100 amps on the neutral) as RustyJC was saying. If the campground is using only one phase to feed the pedestal, then both 30 amp cords would be on the same phase. That is the danger of it. If you know how to use a voltage tester, you should have 208-240 between the two 30 amp receptacles, if you read 0 volts between the two, but 120 volts to ground then both receptacles are on the same phase. (This is why the campground probally did not install a 50 amp in the first place.)
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Old 05-29-2008, 09:59 PM   #10
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I use one of the boxes, so I always test the 50 amp socket fed by the 2 30 amp cords with a 120 & 240 volt test light (less than $10 at Home Depot). If I have 240 volts between the 2 hot wires and 120 between each hot wire and the return, I'm good. If there is not 240 volts between the 2 hot wires, than the 2 sources are not out of phase and the box cannot be used.

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