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Old 09-27-2015, 09:43 AM   #1
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Wiring 50 amp receptical

Sorry, going to a ask a question that likely will draw several different responses. Click image for larger version

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ID:	90006, in the attachment is a four wire set up with l1 and l2 being the supply of 120 volts each leg. If this is correct wiring for modern 50 amp service, then why do so many speak to 50 amp RV wiring as different than standard 220 wiring, as this wiring is the same as a modern 220 volt, electric stove found in modern homes. I guess the biggest confusion I struggle to understand is why the reference that 50 amp rv service is 2 single lines of 120 volts, being that is what residential 220 wiring for dryers, stoves, and the like are...
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Old 09-27-2015, 10:06 AM   #2
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Originally Posted by john5646 View Post
Sorry, going to a ask a question that likely will draw several different responses. Attachment 90006, in the attachment is a four wire set up with l1 and l2 being the supply of 120 volts each leg. If this is correct wiring for modern 50 amp service, then why do so many speak to 50 amp RV wiring as different than standard 220 wiring, as this wiring is the same as a modern 220 volt, electric stove found in modern homes. I guess the biggest confusion I struggle to understand is why the reference that 50 amp rv service is 2 single lines of 120 volts, being that is what residential 220 wiring for dryers, stoves, and the like are...
You are correct in that 50 amp 120/240 split phase service is common.... when wired correctly with 2 hot legs, a neutral, and a ground (NEMA 14-50R). Some older appliance outlets are only wired with three wires though.

What many fail to understand is that although dryers and stoves use 240 volts....... the RV does NOT.

The RV will only use 120 volts of the 120/240 split phase service.... which keeps the two legs separate in the RV's electrical distribution panel to provide this.

Although you have a schematic that shows the 120/240 split phase service from the outlet box to the RV, this one shows the service once it goes to the RV's electrical distribution panel...so you can visualize how the two legs (L1 and L2) are separate........ and thus a 240 volt stove or dryer as you stated would not work in the RV.

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Old 09-27-2015, 10:12 AM   #3
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The Neutral makes all the difference.

Most 220 volt appliances use no Neutral. They have an L1, an L2, and a safety ground ONLY (3 wires not 4).

Without the Neutral (which allows 120 volts on each leg - 4 conductors and socket) you will be supplying 220 volts to your appliances.

This is only ONE result:
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Old 09-27-2015, 10:27 AM   #4
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Difference is no load in RV can accept 220 VAC, many household loads require it. If the three way plug shows up with two hots, every item in-house will cook if left on. It's all in the wiring method.......
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Old 09-27-2015, 11:34 AM   #5
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Thank everyone, I just wanted to and was starting to question myself, with how I should wire my 4 wire receptical female end to receive rv cord. Here at home so I would have true and full power. I.e., I have prior power to garage and added receptical yesterday.
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Old 09-27-2015, 11:49 AM   #6
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Quote:
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Thank everyone, I just wanted to and was starting to question myself, with how I should wire my 4 wire receptical female end to receive rv cord. Here at home so I would have true and full power. I.e., I have prior power to garage and added receptical yesterday.
All of that can be found at this site

http://www.myrv.us/electric/

or here is a pdf of it:

http://www.myrv.us/Imgs/PDF/50-amp%20Service.pdf
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Old 09-27-2015, 01:04 PM   #7
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Over thinking as always on the form answer to your question is yes that is the proper way to wire the receptical.
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Old 09-27-2015, 01:16 PM   #8
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One additional point. When running a 50 amp rig on 30 amp service L1 and L2 are tied together in the adapter or cord. This allows L2 circuits to receive power.
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Old 09-27-2015, 02:04 PM   #9
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j free and Harkerr, you both nailed it THANK YOU, this is what I had assumed and t ally what I needed.. I should have asked my question using your answers..... But all the info I've received has been very useful. No one can ever be over informed.
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Old 09-27-2015, 02:40 PM   #10
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One additional point. When running a 50 amp rig on 30 amp service L1 and L2 are tied together in the adapter or cord. This allows L2 circuits to receive power.
This results in one gigantic 30 amp buss. It is extremely easy to overload the 30 amp service, so be very careful.
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