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Old 05-19-2020, 08:46 PM   #1
jashle6
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Default 50 amp or 30 amp service

Bought 2006 fema trailer, original Male plug removed from power cord, replaced with regular 3 prong plug. Cord has red, black, white and ground wire. With these 4 wires does this mean it is 50 amp? Want to get it wired right. Thanks
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Old 05-19-2020, 09:47 PM   #2
Chuck v
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To which pins of the regular 3-PRONG plug were each color wired? It may help us answer your question...


The four insulated wires of four different colors (Green is the ground wire and insulated and not bare copper...) in the cable would imply a 50 amp service, so if the wires used on the 3 prong plug were green to the U-ground lug, and white with red (or alternatively white with black) to the remaining to blades then that modification was only powering half of the potential loads in the trailer. The standard way to wire a 50 amp RV plug is shown below. The green wire goes to the round pin, and the white wire goes to the far blade...

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Old 05-19-2020, 09:51 PM   #3
jashle6
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Red wire was not used in rewire
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Old 05-19-2020, 10:12 PM   #4
Chuck v
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Ok, then the cable supports a 50 amp service, and your present 3 prong plug is only providing power to half the trailer's circuits. you can wire the 50 amp plug per the diagram above -- you can always use a 50 amp to 30 amp 'dogbone' adapter if you need to plug the trailer into a 30 amp (or even a 20 amp service, with the use of the additional adapter from 30 amp plug to conventional three prong plug.)



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Old 05-31-2020, 01:39 PM   #5
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If the wires are #6 Gauge it is 50 amp 220volt 30 amp would be # 10 gauge
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Old 05-31-2020, 05:23 PM   #6
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Viking,


The OP was discussing the service cord wiring, not a service drop from a power breaker panel. Even a panel can use 8 AWG or smaller if the run is 25 feet or less (the 6 AWG presumes a 50 ft run.)


Some RV 50 amp extension cords use even smaller wire sizes as seen here for a 36 ft cord using 10 AWG conductors:
https://www.walmart.com/ip/VEVOR-RV-...yABEgI-TvD_BwE


10 AWG is a bit small for my liking, but it is clearly done for this application space...



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Old 05-31-2020, 08:23 PM   #7
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the easiest answer is to look at the MAIN PANEL's main breaker within the RV - it's self explanatory if it says '30' or it has a double that says '50'...
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