What does WR mean on an outlet?

WR stands for weather-resistant. It means the receptacle has passed additional testing for exposure to moisture, UV light, and temperature extremes beyond what a standard indoor outlet is rated for.

Is a weather-resistant outlet the same as a weatherproof outlet?

Not exactly. The receptacle itself is weather-resistant, but a complete outdoor installation also needs a weatherproof box and cover. The outlet alone does not make the installation weatherproof.

Do all outdoor outlets need to be weather-resistant?

Yes. The NEC requires weather-resistant receptacles in outdoor locations and other damp or wet areas. This has been a code requirement since the 2008 cycle.

Can I use a regular outlet outside with a weatherproof cover?

No. Code requires the receptacle itself to carry a weather-resistant rating in outdoor locations. A weatherproof cover alone does not satisfy the requirement.

Do weather-resistant outlets also need GFCI protection?

Yes, in most outdoor locations. GFCI protection and weather resistance are separate requirements that both apply to outdoor receptacles under the current code.

Weather-Resistant Outlet — WR Receptacle for Outdoors

A weather-resistant outlet is a receptacle built with corrosion-resistant contacts and UV-stabilized materials to withstand outdoor exposure.

Weather-Resistant Outlet diagram — labeled parts and installation context

What It Is

A weather-resistant (WR) receptacle meets additional testing requirements beyond a standard indoor outlet. UL 498 specifies that WR-rated devices must pass a corrosion resistance test (exposure to a salt-spray environment), a UV exposure test simulating years of sunlight, and a moisture resistance test. The contacts are typically made from brass or bronze alloys that resist oxidation, the terminal screws are plated to prevent corrosion, and the body material is a UV-stabilized thermoplastic that will not crack or become brittle from prolonged sun exposure.

The NEC has required weather-resistant receptacles in all outdoor locations since the 2008 code cycle (NEC 406.9). Subsequent editions expanded the requirement to cover additional damp areas such as bathrooms, garages, and laundry areas in some jurisdictions. A WR receptacle is used in conjunction with a weatherproof box and an in-use cover, but it is not a substitute for those enclosures — all three components must be present for a code-compliant outdoor installation.

Types

15-amp duplex WR receptacles are the most common and fit standard residential circuits. 20-amp WR receptacles have one T-shaped slot and are required on 20-amp branch circuits per NEC 210.21(B). Weather-resistant GFCI outlets combine ground-fault protection and WR durability in a single device, which simplifies outdoor installations by eliminating the need for a separate GFCI upstream.

Tamper-resistant and weather-resistant (TR/WR) combination outlets include internal shutters that block foreign objects from being inserted into the slots — NEC 406.12 requires tamper resistance on nearly all 15- and 20-amp receptacles in dwellings, so most outdoor outlets carry both ratings. Decorator-style WR receptacles have the wider rectangular face compatible with decorator wall plates and smart outlet systems.

Where It Is Used

Weather-resistant outlets are installed on exterior walls, porches, patios, decks, pool equipment pads, garages, carports, and any location exposed to weather or persistent damp conditions. They are also required in covered but unheated spaces where condensation occurs, such as detached workshops and open-air pavilions. NEC 210.52(E) requires at least one outdoor receptacle at the front and back of every dwelling, and all of these must be WR-rated.

In commercial construction, WR receptacles appear on loading docks, building perimeters, parking structures, and outdoor dining areas. They are also used in agricultural buildings and boat docks where moisture and salt exposure are constant.

How to Identify One

Weather-resistant receptacles are stamped or printed with a WR marking on the face or the side of the body. The marking is usually molded into the plastic near the grounding slot or printed on a label between the hot slots. The device may also carry TR markings for tamper resistance, a UL listing mark, and an amperage and voltage rating (typically 125V, 15A or 20A).

Visually, a WR receptacle looks similar to a standard indoor outlet, so the stamped marking is the definitive identifier. If the outlet is installed outdoors without a WR stamp, it does not meet current code regardless of the box and cover.

Replacement

Replacement is needed when the contacts corrode and no longer grip plugs firmly, when GFCI protection fails the monthly test-button check, when the body shows UV cracking or discoloration, or when a code update requires WR ratings where none existed before. Before replacing, turn off the breaker and verify the circuit is dead with a non-contact voltage tester.

Outdoor receptacle work typically requires GFCI protection on the branch circuit per NEC 210.8(A), and a permit is required in most jurisdictions for new outdoor outlet installations or for upgrading from a non-GFCI circuit. When replacing the receptacle, inspect the weatherproof box for corrosion, check the in-use cover gasket for deterioration, and confirm that all cable entries are sealed to prevent moisture from reaching the conductors behind the device.