Handy Voltage Reference for 50 Amp Plug Wiring
Here is a picture showing 50 Amp Plug wiring and voltages commonly used in RV Parks.
However, to make things easier, I've added little pictures of voltmeters showing you the approximate voltage you should be seeing if you attach the probes like shown.
In real life you won't have three volt meters so you'll check between two connection one at a time. I feel better now.
Here are several articles you might find useful that are related to this subject :
- If you know nothing about electricity – “A Good Starting Point for learning about RV electrical systems“.
- Great article on “What are Volts and Amps?”
- Excellent article on “What is Power or Watts?”
- “Primer on the Different Electrical Services found at RV Parks“
- RV Power – Those darned complex terms – Watts, Amps, Volts
For instance, the smallest aluminum wire would be # 4 AWG. The larger the wire the more current it can carry. I used aluminum at my house and it was substantially less expensive than copper. You'll get some emotional responses sometimes on aluminum versus copper, but if you follow the guidelines for EACH type of wire for temperature, voltage drop, etc. then it should not matter. It is just math.
For copper, No 6 THWN could be used.
For both types of wires, just follow the guidelines for length, current carrying capacity and so forth and you'll be OK.
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