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Old 01-04-2013, 08:43 AM   #1
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220 to 110


hey men i have a horse trailer with a 120v marquis generator 7000 it has 2 30amp breakers i can get about 28 amps per leg in the trailer i have 2 qo square d breaker boxes 2 20 amp breakers a piece on leg from gen to each breaker box . when plugged into shore power 50amp service i catch one leg of the 220 output for each br box it works pretty good but i was reading one of the other threads about the neutral wire . is there a problem using the 220 neutral when it goes to 120v on shore power . thanks

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Old 01-04-2013, 09:44 AM   #2
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220 to 110


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Originally Posted by Kpack View Post
hey men i have a horse trailer with a 120v marquis generator 7000 it has 2 30amp breakers i can get about 28 amps per leg in the trailer i have 2 qo square d breaker boxes 2 20 amp breakers a piece on leg from gen to each breaker box . when plugged into shore power 50amp service i catch one leg of the 220 output for each br box it works pretty good but i was reading one of the other threads about the neutral wire . is there a problem using the 220 neutral when it goes to 120v on shore power . thanks
For a 30 amp @ 240 volt feed (10 gauge wire) you can feed only one allotment of 28 amps from your 120 volt generator to the on shore power system. (You can connect the single generator hot to both hots of the transfer switch.)

You may not parallel the outputs of two generator receptacles with a grand total of 56 amps to feed the 10 gauge lines. In the 120 volt generator the two allotments are not out of phase with each other and will overload the shared neutral.

You must never construct, possess or use a cable or adapter with two or more male plugs, for example to plug into two receptacles at the same time.

You may not hook up the generator to the dock end (far end) of the existing line intending to reverse feed the on shore building where the meter is because there is no way to guarantee that connection to utility power is disconnected before the lines are energized using the generator. But you can have a separate line run from a transfer switch or interlocked breaker at the building panel down to a parking space for the generator trailer and this line is used for no other purpose besides hooking up a generator.

In the U.S. there is no such thing as a 220 (240) volt neutral.

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Last edited by AllanJ; 01-04-2013 at 10:03 AM.
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Old 01-04-2013, 10:14 AM   #3
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220 to 110


Allen what i mean is when i,m when at a rv park and i plug into 50 amp service im sharing the neutral of the service going to 120 in the trailer . from my gen out put wires i wired to female 50amp reseptical that's hot to 1 blade and other hot to other blade on neutral i have both neutral #10 together and your gr shore power male 50amp plug wired same way shared neutrals that goes to the 2 qo breaker boxes in trailer they share the neutral but not the hots that way when i plug in to rv park i,m using 1 leg of the for each br box but they are sharing the neutrals and it keeps my trailer 120 but is there a problem sharing the neutrals on shore power like that i hope you understand what i,m asking i have not had any problems doing this but the only shore power i have plugged into is 120 i made a pig tail from 50amp plug to 30plug and put the two hots together in the pigtail you only get 30amps on shore but that's still pretty good but when i do run into a 50 amp service i was wondering about the shared neutrals
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