Quote:
Originally Posted by JRTJH
Using the calculated voltage drop, here's the actual figures:
6/3 AGW wire, at 125 ft distance carrying a total 50 Amp load with an input voltage of 120 VAC single phase would deliver (at the terminal plug) 114.992 volts AC. the total voltage drop would be 5.078 volts (well within the acceptable range for RV use)
4/3 AGW at the same distance carrying the same load would provide 116.807 volts with a total voltage drop of 3.192 volts.
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Industry design standard is 5% drop from the service entrance, which includes the 2% from service to the panel and 3% for the feeder. If you're pulling from the panel, which is also the service, then you're probably ok using the whole 5% on the run.
That said, voltage drop fries motors. Motors are typically rated at 115v and the service is likely closer to 130v.
I believe the 50A plugs are 240v, not 120, so you're even better off there. That said, southwire has an online calculator that you can use.