Good Morning Ron, as a 50 year RV owner and retired power engineer I can describe for you how a 50 Amp RV is configured and (maybe NOT yours) SOME 50 Amp 240 Volt Receptacles are configured. HOWEVER I can NOT know how the receptacle you mentioned is configured !!!!!!!
(A) SHORT ANSWER To your specific question Conductor colors are red, black, green, white. Which color is considered the 4th? I'm not real sure of how to use the 4th conductor in a box on the side of a building where this cable will be plugged into.
Red Hot L1, ,Black Hot L2,, Green Ground,, White Neutral If it has Four terminals and 120 L1 OR L2 to Neutral OR Ground and 240 L1 to L2 Thats how many 50 Amp RV's are often configured IE thats NEMA 14-50 !!!!!!!!!
That can be referred to as THREE POLE FOUR WIRE GROUNDING
(B) LONG ANSWER
Is your receptacle a straight 240 ONLY Volt 50 Amp THREE WIRE (used for some appliances tools or welders or compressors) consisting of two Hots L1 & L2 240 VAC plus a Green/Bare Equipment GroundiNG Conductor but NO Neutral orrrrrrrrrrrrrrr is it a 120/240 FOUR WIRE with two Hots, Neutral, Ground consisting of 120 plus 240 ??????????
1) A 50 Amp RV often uses a NEMA 14-50P Plug which plugs into an RV parks power pedestals NEMA 14-50R Receptacle.
2) If wired as most (no warranty some are different) RV park pedestals NEMA 14-50R receptacles
Black Hot L1 Red Hot L2 White Neutral Green/Bare Equipment GroundING Conductor
3) If wired as most common (not all) there is 240 VAC L1 to L2,,,,,,,,,120 VAC L1 OR L2 to Neutral,,,,,,,,,,,120 VAC L1 OR L2 to Ground
4) MOST 50 Amp RV's do not use any of the available (if wired that way as typical) 240 VAC but the two legs of 120 L1 and L2 which are 120 to Neutral IE one AC is on L1 other AC on L2
5) HOWEVER there are some RV's that if plugged to 120/240 NEMA 14-50R receptacles actually use 240 VAC for perhaps appliances such as a clothes dryer or water heater or a heat pump NOT COMMON BUT ITS DONE
6) YOUR HOME 240 VOLT 50 AMP RECEPTACLE See above. Is it Three or Four terminal (does it have a White Neutral) ??? Is it a NEMA 14-50R Four terminal like RV parks use ??? Is it 240 L1 to L2 ??? Is there 120 VAC available Just because its a 240 Volt 50 Amp DOES NOT mean it has a Neutral, it may well be a straight 240 ONLY (Two hots and ground) for like a welder or a 240 compressor
Your 50 Amp RV IS MOST LIKELY as I described above HOWEVER you have to figure out that receptacle before I can advise further........
NOTES A 50 Amp RV (most done use 240) can work from a receptacle that ONLY has 120 IE L1 and L2 are on the same phase NO 240 L1 to L2 HOWEVER you have to be careful NOT to overload the max amps available and NOT overload the Neutral.......
If your Receptacle DOES NOT HAVE A NEUTRAL DO NOTTTTTTTTTT use its Ground for a Neutral !!!! If your Receptacle DOES HAVE A NEUTRAL AND A GROUND let me know
They make adapters so 50 Amp RV's can be powered from 120 ONLY receptacles even a NEMA TT-30R like 30 Amp RV;s use....All the adapter does is splice BOTH L1 and L2 to the 50 Amp so both legs in a 50 Amp RV work BUT REMEMBER THERES ONLY X AMPS AVAIALBE
It all boils down to WHAT YOUR RECEPTACLE HAS to see if it can power your RV and how if any adapters may be required.
SEE HOW YOUR RECEPTACLE IS CONFIGURED AND THEN I CAN ADVISE YOU FURTHER Is it a NEMA 14-50 R with FOUR terminals ??? and if so are there Red Black White and Green conductors feeding it ??? and if so is there 120 L1 or L2 to Neutral or Ground and 240 L1 to L2 ???
Let me know Ron, best wishes
John T Live in the RV at Davis Bayou Ocean Springs MS
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