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09-27-2015, 08:43 AM
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#1
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Senior Member
Join Date: Sep 2015
Location: lancaster
Posts: 320
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Wiring 50 amp receptical
Sorry, going to a ask a question that likely will draw several different responses.  , 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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09-27-2015, 09:06 AM
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#2
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Site Team
Join Date: Nov 2010
Location: Northeast Louisiana
Posts: 33,952
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Quote:
Originally Posted by john5646
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.
__________________
 2011 Flagstaff 831 RLBSS
A 72 hour hold in a psych unit is beginning to intrigue me as a potential vacation opportunity.
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09-27-2015, 09:12 AM
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#3
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Site Team - Lou
Join Date: Oct 2009
Location: South Eastern PA
Posts: 23,269
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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:
__________________
Lou & Freya the wonder dog
2008 GMC Sierra 3000HD Allison Duramax
2019 Flagstaff 8529FL
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09-27-2015, 09:27 AM
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#4
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Senior Member
Join Date: Dec 2011
Posts: 3,570
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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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09-27-2015, 10:34 AM
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#5
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Senior Member
Join Date: Sep 2015
Location: lancaster
Posts: 320
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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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09-27-2015, 10:49 AM
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#6
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Site Team
Join Date: Nov 2010
Location: Northeast Louisiana
Posts: 33,952
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Quote:
Originally Posted by john5646
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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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
__________________
2011 Flagstaff 831 RLBSS
A 72 hour hold in a psych unit is beginning to intrigue me as a potential vacation opportunity.
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09-27-2015, 12:04 PM
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#7
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Senior Member
Join Date: Dec 2014
Location: oakdale, ca
Posts: 292
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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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09-27-2015, 12:16 PM
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#8
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Senior Member
Join Date: Nov 2014
Posts: 593
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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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09-27-2015, 01:04 PM
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#9
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Senior Member
Join Date: Sep 2015
Location: lancaster
Posts: 320
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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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09-27-2015, 01:40 PM
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#10
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Site Team - Lou
Join Date: Oct 2009
Location: South Eastern PA
Posts: 23,269
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Quote:
Originally Posted by Harkerr
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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This results in one gigantic 30 amp buss. It is extremely easy to overload the 30 amp service, so be very careful. 
__________________
Lou & Freya the wonder dog
2008 GMC Sierra 3000HD Allison Duramax
2019 Flagstaff 8529FL
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