What is the difference between in-use and while-in-use covers?

In-use covers only protect the outlet when nothing is plugged in. While-in-use (bubble) covers protect the outlet even with a cord plugged in during rain, and are required by current code.

Do outdoor outlets need to be GFCI protected?

Yes, all outdoor outlets must have GFCI protection per NEC. You can use a GFCI outlet or a GFCI breaker to provide this protection.

Outdoor Electrical BoxGenerating image…

Electrical

Boxes

$5-$40 per box with cover

Outdoor Electrical Boxes (2026)

Prepared by Lumberama's Building Materials Team

|Last updated May 15, 2026|Sources & methodology

Outdoor electrical boxes are weatherproof enclosures designed to protect electrical connections, outlets, and switches from rain, snow, dust, and moisture. They feature gasketed covers, corrosion-resistant materials, and NEMA ratings for different exposure levels. Essential for any exterior electrical installation.

Key Features

Weatherproof gasketed construction
NEMA 3R rated for outdoor use
In-use and while-in-use cover options
Corrosion-resistant materials
Multiple knockout configurations

Specifications

Materials: PVC

die-cast aluminum | NEMA Rating: 3R (outdoor) | Cover Types: In-use

while-in-use

bubble | Sizes: Single-gang

double-gang | Knockouts: 1/2

3/4 inch

Applications

Exterior outlet installations
Outdoor lighting switches
Landscape lighting junctions
Hot tub and pool equipment
Outdoor kitchen circuits

Installation Overview

Mount box to exterior wall surface or recess into siding. Run conduit or NM-B cable (where permitted) to the box through weatherproof connectors. Install GFCI outlet and while-in-use cover. Seal all penetrations with exterior caulk.

Pros & Cons

Pros

✓ Protects connections from weather
✓ NEMA rated for durability
✓ Multiple cover options
✓ Required for code compliance

Cons

✗ More expensive than indoor boxes
✗ Covers can be bulky
✗ Must maintain gasket seals
✗ Limited interior space

Top Brands

Eaton

Southwire

Code Requirements

NEC requires weatherproof covers on all outdoor outlets. While-in-use covers required for outlets that may be used with cords plugged in during rain. All outdoor outlets must have GFCI protection.

Buying Tips

Choose while-in-use covers for all new outdoor installations as they are now required by code. Match the box material to your siding. PVC boxes resist corrosion better in coastal areas.