What Size Extension Cord Does a 30 Amp RV Need?

Choose a 10-gauge RV extension cord rated for 30 amps, with three conductors and matching TT-30 connections. These cords are commonly marked 10/3, meaning three conductors made with 10-gauge wire.

A 30 amp RV connection is typically 120 volts. A matching cord is designed for that service, while a household extension cord may have a different wire size, plug, and rating.

Your cord should have a TT-30P male plug for the power source and a TT-30R female receptacle for the RV cord. If either connection differs, don't force it.

Check the RV manual and use only a properly rated adapter for the exact connection.

Does cord length affect the size you need?

Use the shortest cord that reaches the pedestal with a little room to spare. A longer run can increase voltage drop, especially when the RV is drawing a heavy load.

Measure the route from the pedestal to the RV inlet, including the path around tires, steps, and walkways. Avoid stretching the cord tight or laying it where people can trip over it.

A 50 ft cord can help when a campsite pedestal sits farther from the RV. For example, the Camco PowerGrip is a 50 ft, 30 amp cord with 10-gauge copper wires and standard TT-30 connectors.

If you need less reach, a shorter cord can be easier to route and store. Read our guide to the best 30 amp RV extension cords for more options.

Can you use a regular household extension cord?

Don't use a household extension cord as a substitute for an RV-rated 30 amp cord. Household cords may have a lower amp rating, smaller wire, or the wrong connector for the RV and pedestal.

A 30 amp RV can draw far more power than many household extension cords are designed to carry. The cord, plug, and connection can heat up when overloaded.

Avoid linking cords together to reach a distant pedestal. Use one properly rated RV cord that reaches the outlet, and ask campground staff about site power if the pedestal is too far away.

What do 10/3 and TT-30 mean?

10/3 describes the wire size and conductor count; TT-30 identifies the RV connection type. A standard 30 amp RV extension cord uses 10-gauge wire and three conductors.

The plug should fit the 30 amp RV outlet without force. If the pedestal has a different outlet, such as a 50 amp receptacle, use only an adapter rated for the connection and your equipment.

A 30 amp RV and 50 amp RV have different service connections and capacities. See 30 amp vs 50 amp RV service to identify what your rig uses.

How do you choose a cord for campground hookups?

Match the cord to your RV's inlet and the campground pedestal, then select enough length for the site. Keep the cord rating, connector type, and condition in view.

Look for a cord with a 30 amp rating, 10-gauge conductors, and TT-30P/R connectors. RVGUARD's 50 ft cord has those standard connectors, a 10/3 STW jacket, and a power indicator light.

The PlugSaf cord is also 50 ft, 10-gauge, 30 amp, and uses TT-30P/R connectors. Its grip handle and adjustable organizer may be useful if you want help with plugging in and storage.

Choose based on the length and features you need. Don't treat a power indicator as proof that every campground wiring condition is safe; check the power source and your RV equipment as directed by their manufacturers.

How many amps can your RV cord carry?

A 30 amp cord is rated for 30 amp service, but the RV's combined load still matters. Running multiple high-draw appliances at once can trip a breaker or exceed the available power.

Your air conditioner, water heater, microwave, and other appliances can draw power at the same time. Use the RV's electrical controls and appliance guidance to manage the load.

Our guide to how many amps an RV uses explains how common appliances add to your total draw. The cord's rating doesn't increase the campground's available power or the RV's capacity.

How can you avoid cord and connection problems?

Inspect the cord, plug, and receptacle before every hookup. Don't use a cord with cracked insulation, bent prongs, loose connections, or signs of heat damage.

Keep connectors fully seated and protect them from standing water. Route the cord so it won't be pinched by a slide, crushed by a tire, or pulled by foot traffic.

Don't coil extra cord tightly while drawing a heavy load. Lay it in a loose route where you can see and inspect it, and follow the cord maker's instructions.

If you use a surge protector, confirm that its connectors match the RV and pedestal. Our guide to using a 50 amp surge protector with a 30 amp RV covers the adapter question.

Which 30 amp RV extension cord size should you choose?

For a 30 amp RV, choose 10-gauge wire, three conductors, a 30 amp rating, and TT-30 connectors. Use the shortest safe length that reaches the pedestal without tension.

Choose a 50 ft cord when the campsite layout needs the extra reach, and keep the cord in good condition between trips. Compare more options in our 30 amp RV extension cord guide.

Frequently asked questions

What gauge extension cord do I need for a 30 amp RV?

Use a 10-gauge cord made for 30 amp RV service, with a TT-30P plug and TT-30R receptacle. Check the cord's rating and condition before connecting it.

A household extension cord, even a thick one, may have the wrong connectors or rating for an RV.

Can I use a 50 amp extension cord with a 30 amp RV?

A 50 amp cord may work only with the right rated adapter and compatible connections, but the RV still draws power according to its own 30 amp system. Match the cord and adapter to the campground outlet and RV inlet, and follow the equipment instructions.

How long can a 30 amp RV extension cord be?

Use only as much length as needed to reach the pedestal without stretching or creating a trip hazard. Longer cords can increase voltage drop, especially under heavy loads, so avoid connecting multiple extension cords to make up extra distance.

Is a 10 gauge extension cord enough for a 30 amp RV air conditioner?

A 10-gauge RV cord rated for 30 amps is intended for 30 amp service, which can power the RV's air conditioner if the total load stays within the RV and campground limits. High demand from other appliances can still overload the circuit.

What Size Extension Cord Does a 30 Amp RV Need?