Understanding Your RV Pedestal
Understanding your RV Pedestal – Intro 101
30-amp (120 volts – 2 pole, 3 wire RV outlets)
The 30 amp, or the more technically called TT-30P (plug) and TT-30R (receptacle) are designations reserved specifically for motorhomes, rv’s and trailers. The 30 amp RV Plug is 120-volts and must be wired accordingly. A 30 amp will consist of 3 wires; black (HOT), white (neutral) and green (grond).
50 amp (120/240 volt 3 pole 4 wire)
The 50 amp has 4 wires with two being HOT and is the standard for larger RV’s. The receptacle is labeled 14-50R and the plug 14-50P. The wiring consists of two, 120 volt hot wires, a neutral, and the half round pin being the ground. The two independent 120 volts creates 240 when you test across and 120 volts between each individually with ground and neutral. The two wires should be connected to a 50 Amp breaker.
15/20 amp
The 15 & 20 amp is the most common outlets with the 20 amp usually found with GFCI protected outlets. Rated for 125 volts/20 amps. Much like the 15 amp receptacles found in homes. GFCI receptacles are recommend on any outdoor outlets
Wire size recommendations
120V Distance | 15 Amp | 20 Amp | 30 Amp | 50 Amp |
25 Feet | #14 Gauge | #12 Gauge | #10 Gauge | #8 Gauge |
50 Feet | #12 Gauge | #10 Gauge | #8 Gauge | #6 Gauge |
100 Feet | #10 Gauge | #8 Gauge | #6 Gauge | #4 Gauge |
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