20, 30 or 50 Amp: Matching Your Rig to the Pedestal

It is four in the afternoon in July. The roof air conditioner is running, the microwave is warming a burrito, and somebody starts the hair dryer. Then everything goes quiet. The breaker did exactly what it was built to do, and the only mystery is why nobody saw it coming. If you have ever stood at a pedestal flipping a switch back on, this one is for you.

What the numbers mean

Amps describe how much current a circuit can carry before its breaker trips. Multiply by voltage and you get watts, which is how most appliances are labeled. A 20 amp service at 120 volts is about 2,400 watts. A 30 amp service is about 3,600 watts. A 50 amp service is really two 120-volt lines of 50 amps each, which works out to roughly 12,000 watts in total, though no single appliance can pull more than its own line gives it. This is rough arithmetic and your rig's manual has the exact figures, but it is good enough to tell you where you stand.

Add up what you actually run

Most of the load in a typical rig comes from a few heavy items. The numbers below are common ranges, not promises, so check the label on your own equipment:

• Roof air conditioner: often 1,200 to 2,000 watts running, with a bigger jolt at startup
• Microwave: commonly 1,000 to 1,500 watts
• Electric space heater: usually 1,500 watts on its high setting
• Hair dryer or electric kettle: 1,200 to 1,800 watts
• Electric water heater element, if yours has one: around 1,400 watts

On a 30 amp service you have about 3,600 watts to share. One air conditioner plus a microwave is already near that. On 20 amp you are managing things closely: one big appliance at a time. On 50 amp most people stop thinking about it, which is the whole appeal. Count your own list honestly, then add a cushion, because breakers trip more readily when running near their limit for a long time.

Adapters work in one direction

A short adapter, sometimes called a dogbone, lets a plug fit a different outlet. It does not change what the circuit can deliver. A 30 amp rig plugged into a 50 amp pedestal through a 50-to-30 adapter still has a 30 amp rig. It simply has a very comfortable supply behind it. The reverse is where people get caught: a 50 amp rig on a 30 amp outlet gets about 3,600 watts for everything, so the second air conditioner and the electric heater cannot all run at once. Know which way your adapter goes before you leave home, and keep it in a spot you can reach without unpacking the basement bay.

How it works at Bull Run

Bull Run RV Park lists 20, 30 and 50 amp full hookup among its amenities, along with municipal water and sewer connections. The park also says its rates include county water, sewer and electricity, so there is no meter to watch on a standard stay. The pads are 45 feet by 15 feet with an 8 by 8 patio attached, and photos show rows of concrete pads, each with its own utility pedestal. One thing to plan around: generators are not allowed at the park. If you have been in the habit of running one to bridge a gap, you will rely on the pedestal here.

Electric cookers and smokers are allowed, and the park notes an electrical surcharge may apply. If you cook with a big electric unit, ask about that when you call (704) 685-6437, and mention it again when you check in so there are no questions later. For problems with utilities after hours, the park's instruction is to call park management.

Protect your gear, whatever the amperage

Pedestals take weather and wear, and a bad one can damage a rig's electronics. A few habits cost almost nothing and prevent most grief:

• Turn the pedestal breaker off before you plug in or unplug, so you never make or break a live connection
• Use a surge protector or an electrical management system between the pedestal and the rig, and read its display before you turn on the air conditioner
• Check the cord for heat after an hour of heavy use: a plug that is hot to the touch is a warning
• Do not leave a heavily loaded cord coiled, because coils trap heat
• Stagger startups: let one air conditioner settle before you start the second

A plug-in outlet tester costs little and tells you at a glance if a pedestal outlet is wired correctly. If any reading looks wrong, do not argue with it: leave the rig unplugged and let the park know.

A quick way to pick the right setup

Look at the plug on your power cord. A three-prong plug with one angled blade is 30 amp. A larger four-prong plug is 50 amp. A plain household-style plug is 15 or 20 amp. Then look at your biggest load. One air conditioner and light cooking sits comfortably on 30 amp. Two air conditioners, an electric heater in a cold snap, or an electric dryer want 50 amp. Because Bull Run has all three kinds of service, you are not forced to guess a park's setup from a directory listing. Tell the office what your rig uses, and for anything unclear, ask before the move rather than after.