As per the below wiring diagram, a 30 amp plug has three prongs and is generally used on RVs with lower load requirements. As illustrated here, a 30 amp RV plug has three prongs of 120V -- a hot wire, a neutral wire, and a ground wire. It should be noted here that when you design the wiring diagram of a 30 amp RV plug, ensure you label 220V correctly. In most cases, people label the plug with 110V, which is incorrect. Instead of using some complex tools to create such complex wiring diagrams, you can use EdrawMax Online, which comes with free wiring diagram templates that help you create the wiring diagram as per your preference.
