02 — Read the Plug
Read the Cord Before Anyone Picks a Breaker
RV power comes in two common home-circuit sizes, and the cord tells you which one a coach uses. Hubbell describes its TT-30 plug and receptacle as NEMA TT-30 devices that deliver 30 amps at 120 volts, commonly used for RV shore power.
Airstream’s support pages compare the two. A 30-amp cordset has a single 120-volt hot wire, a neutral, and a ground, for a maximum of 3,600 watts. A 50-amp cordset has two 120-volt hot wires, a neutral, and a ground, for a maximum of 12,000 watts. Airstream notes that several of its travel trailer models come with 30-amp service, and some can be upgraded to 50-amp service. The plug on your own cord is what counts.
Hubbell lists its TT-30 devices as UL and cUL Listed, and a receptacle listed for the plug belongs at the parking spot. Before we quote, we ask for photos of the cord’s plug end and the coach’s electrical label. Those settle the outlet type and breaker.
03 — 30-Amp Outlet
The 30-Amp RV Outlet That Looks Like an Old Dryer Outlet
RV electrical writer Mike Sokol points out that the TT-30 closely resembles the old-style dryer outlets common in the 1960s. The two shapes look alike, yet the RV version is a 120-volt device, and Sokol stresses that a 30-amp RV belongs on a single-pole, 120-volt breaker.
The converter and microwave in a 30-amp coach are built for 120 volts, and a TT-30 wired across both legs of a 240-volt circuit would hand them twice that.
04 — Adapters
What an Adapter Leaves Unchanged
Adapters let one kind of cord reach the other kind of outlet, and Airstream is direct about their limits. A 50-amp coach on a 30-amp source can run a single air conditioner, and owners may be unable to run all their appliances at once. Airstream calls a dogbone a power cable cord adapter, recommends that style, and advises against plug-style adapters.
Winnebago’s manual adds that any adapter must keep the ground.
05 — Outlet Placement
Placing the Outlet Where the Rig Actually Parks
The driveway edge, a side yard, and a pad out back each put the coach’s power inlet somewhere different. We look at how the rig backs in and where that inlet ends up, so its own cord reaches the receptacle without strain.
Outdoors, the RV receptacle gets GFCI protection. It needs a solid wall or post and a weatherproof cover suited to a cord left plugged in.
06 — Process
From Parking Spot to Plugged-In Coach
Photos of the plug and the spot
The RV cord’s plug, the coach’s electrical label or the appliance nameplate, your main panel, where the rig parks, and any larger coach you are considering.
Walk the spot
Parking location under Section 31-701, outlet placement, cord reach, and panel space are reviewed.
Written estimate
The RV outlet and any other circuits on your list, with the permit where required.
Install
Listed receptacle matched to the plug, the correct breaker (single-pole for a TT-30, two-pole for 50 amps), GFCI outdoors, and a weatherproof cover.
Test and hand over
Voltage checked at the outlet, city inspection where required, and a walk-through of which breaker controls it.
07 — Other Appliances
The Rest of the Appliance List on a Suffolk Property
The RV is often one item on a longer list: a range or dryer, a well pump, a heat pump, a hot tub, or shop tools. A dishwasher, a disposal, a hardwired microwave, a sump pump, or a mini-split belongs on the same list, and each of those gets a circuit of its own.
One look at the panel shows whether there is room for a 30- or 50-amp breaker along with a spa circuit or a new range circuit, and whether the panel itself needs attention first. One estimate covers the group, and we handle the permit required by the city for the work. Range, dryer, and water heater circuits follow the appliance nameplate and the maker’s installation sheet, just as the RV outlet follows the plug.
08 — Why Castles
Two Things Settled Before the Breaker Goes In
Single-Pole for a TT-30
A 30-amp coach lands on one 120-volt leg, never across both, on a receptacle listed for that plug.
RV, Spa, and Kitchen Planned Together
One look at the panel answers the whole list at once.
09 — FAQS
Suffolk RV and Appliance Circuit FAQs
10 — Proof
An RV Circuit on the Side of the House, Plus Two More
A Google reviewer mentions a 30-amp RV circuit we added on the side of the house, along with a bathroom outlet and a hot tub circuit.
From our five-star Google reviews
Google 5.0 Rated by Hampton Roads Customers
Castles Electrical maintains a 5.0 rating on Google. The reviews below load as a live widget, so this page shows current feedback from real Castles Electrical customers.
