Why is rv electric 30 amp 120 volt?

Gustave Ferry asked a question: Why is rv electric 30 amp 120 volt?
Asked By: Gustave Ferry
Date created: Wed, Feb 17, 2021 3:40 PM

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Another example would be determining the maximum wattage capacity for an RV with a 30 amp, 120 volt AC electrical system. The formula is 30 amps X 120 volts = 3,600 watts. If you exceed the total 3,600 watt capacity or the total 30 amp capacity it is highly likely the 30 amp breaker in the RV, or the 30 amp breaker at the campground pedestal would trip.

The 30-amp service for an RV is 120-volt with a 3 prong receptacle and a single 30-amp dedicated breaker. The 30 AMP is a standard ANSI C73.13, TT-30P (plug) / TT-30R (receptacle). This designation was made specifically for TRAILERS. Plugs and Receptacles are available at Lowe's, Home Depot, Camping World and Electric Supply houses. Front and the Back of a 30-amp Receptacle 30-amp Single Pole Breaker This service is very simple to wire just follow the color coding for the connections if ...

For instance, you will typically find only single AC units in 30-amp service RVs. 30-amp RV plugs have a single 120-volt hot pin, a flat neutral, and a round ground pin. On the other hand, large RVs usually have 50-amp service to power their more lavish setups (think double AC units, washer/dryers, etc.). 50-amp plugs have two 120-volt hot pins, a flat neutral pin, and a round ground.

amps * volts = watts. 30 amps * 120 volts = 3600 max watts can be used. Here is the dirty little secret about 50 amp RV plugs. They aren’t exactly 50 amps. At the power post, they are wired for 240 volts and split into two 50 amp breakers. That is why, when you look at a 50 amp plug, it has four prongs compared to three on a 30 amp plug.

Your RV has two separate electrical systems: a 12-volt DC electrical system and a 120-volt AC system. The 12-volt system is powered by a battery (or in some cases, multiple batteries), and it powers things such as the start-up on your water heater, furnace, and refrigerator, plus most of the lights in your RV’s living space, your water pump, your carbon monoxide detector, and a number of other things.

The 30-amp service for an RV is 120-volt with a 3 prong receptacle and a single 30-amp dedicated breaker. The 30 AMP is a standard ANSI C73. 13, TT-30P ( plug ) / TT-30R (receptacle). Due to the appearance of the TT- 30 plug , many people assume that it is to be wired for 240-volt, but this is a 120-volt device.

Plugs on RVs with 30 amp service and 50 amp service differ in design. A 30 amp plug has three prongs – a 120 volt hot wire, a neutral wire and a ground wire – and is generally used on RVs with lower load requirements. A 50 amp plug has four prongs – two 120 volt hot wires, a neutral wire and a ground wire – that supply two separate 50 amp, 120 volt feeds. A 50 amp service RV provides a maximum 12,000 watts.

The watts are how much power your electricity has. Here is a bit of an equation. If you have 30 amps of main service in your RV and 120-volts running into it, you will multiply those two numbers to get the number of watts. So, 120 times 30 equals 3600 watts. Now what? Say you had your RV plugged in at home with several electrical appliances turned on.

• 50 Amp RV receptacle will provide 50 amps at 240 volts or 100 amps of 120 volts or about 12,000 watts. You will notice that going from a 30 amp to a 50 amp increases the available power by 333%. That’s over three times more power. This is due to the 50 amp service has four contacts. These are ground, neutral and two 120 volt hot lines.

The reason electricians and DIY homeowners can make this mistake is that a 30-amp/120-volt RV outlet “looks like” a 30-amp/240-volt Dryer outlet. And since that electrician has probably wired in dozens of Dryer outlets while this could be his first RV outlet, that’s why the mistake occurs.

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