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Square D RDB Series Square-Duct NEMA 3R Raintight Wireway, 16-Gauge Steel
The Square D Square-Duct RDB Series is an outdoor raintight wireway trough engineered to protect electrical wiring from rain, sleet, and physical damage. Built from 16-gauge steel with a Gray polyester powder ANSI 49 finish, each 6 in x 6 in cross-section run carries a NEMA 3R rating and is UL Listed for indoor/outdoor use. The RDB Series is available in 2 ft and 4 ft trough lengths, allowing contractors and panel builders to size runs for ganging meter devices, panelboards, switches, and circuit breaker enclosures across commercial and industrial electrical distribution systems. Every length in the family shares the same steel construction, finish, and raintight rating, so the length you choose is simply a matter of the run you need to build.
Key Features
- Trough Length Options: Available in 2 ft and 4 ft lengths to fit the specific run required for gang-mounted enclosures.
- Trunking Dimension: 6 x 6 in cross-section sized for gang-mounting meter devices and enclosures.
- Durable Construction: 16-gauge steel body delivers structural strength and long-term durability in outdoor environments.
- Finish: Gray polyester powder coating, ANSI 49, for corrosion and weather resistance.
- Raintight Design: NEMA 3R enclosure rating protects wiring against rain, sleet, and physical impact in indoor/outdoor locations.
- Removable Cover: Sealable removable cover simplifies wire installation and provides secure, weathertight access.
- Busbar Configuration: Straight-length busbar design supports panelboard and switch ganging applications.
- Series: Part of the Square D Square-Duct RDB Series of raintight wireway troughs.
Certifications & Compliance
- UL Listed
- NEMA 3R Rated Enclosure
- Suitable for Indoor/Outdoor, Ice/Sleet-Proof and Rainproof Locations
Technical Specifications
- Series: RDB
- Country of Origin: Mexico
- Product Size: 6 in x 6 in cross-section
- Product Group: Wiring Devices
Typical Applications
- Outdoor Electrical Wiring Protection
- Ganging Meter Devices and Panelboards
- Switch and Circuit Breaker Enclosure Wiring
- Commercial and Industrial Electrical Distribution
- Wet-Location and Raintight Installations
Why Square D?
Square D backs the Square-Duct RDB Series with 16-gauge steel construction, a durable Gray polyester powder ANSI 49 finish, and UL Listed, NEMA 3R raintight performance across every available trough length. This combination of rugged materials and code-compliant ratings makes the RDB Series a dependable choice for contractors, panel builders, and system integrators who need reliable, weather-resistant wireway protection for outdoor electrical distribution runs.
Manufacturer Resources
Product Specs
- Product Type:
- Wireway
- Product Finish:
- Gray Polyester Powder
- Standards:
- NEMA 3R
- Listing:
- UL Listed
- Series:
- RDB
- Country of Origin:
- Mexico
- Product Material:
- Galvanized Steel
- Product Size:
- 6 in x 6 in
- Department:
- Electrical
- Product Group:
- Conduit & Raceway
- Configuration:
- 6 in x 6 in Cross-Section
- Product Subgroup:
- Wireway
Square D RDB62 – Frequently Asked Questions
1) Can Square D RDB Square-Duct wireway be installed outdoors in the rain?
Yes. The RDB Series trough carries a NEMA 3R enclosure rating and is UL Listed for indoor/outdoor use, so it is suited to rainproof and ice/sleet-proof locations. The sealable removable cover is what makes the raintight claim work, so the cover gasket and seal have to be in place and the cover fastened down after wire pulling. For a dry indoor run only, a NEMA 1 screw-cover trough such as the Milbank BP44 Series is the simpler choice.
2) Can I use RDB Square-Duct to gang meter sockets and panelboards on an outdoor wall?
That is the application it is built for. The straight-length busbar design and 6 x 6 cross-section support ganging meter devices, panelboards, switches and circuit breaker enclosures, and the NEMA 3R rating lets the run sit on an exterior wall. Commercial and industrial distribution, wet-location and raintight work are the typical uses.
3) Is the Milbank BP44 series trough an equivalent to the Square D RDB Series for an outdoor run?
They are not interchangeable on two counts. The Square D Square-Duct RDB Series carries a NEMA 3R raintight rating and is UL Listed for indoor/outdoor, rainproof and ice/sleet-proof locations, while the Milbank 4448-GSC1 is a NEMA 1 screw-cover wireway trough. The Milbank is also a 4 in x 4 in x 4 ft section against the RDB Series 6 in x 6 in cross-section. For a wet or exposed location, stay with the NEMA 3R RDB trough.
4) Which length of Square D RDB trough should I order, 2 ft or 4 ft?
Two lengths are offered: RDB62 at 2 ft and RDB64 at 4 ft. Nothing else changes between them, same 16-gauge steel, same gray polyester powder ANSI 49 finish, same NEMA 3R raintight rating and 6 x 6 cross-section. Pick by the run you have to build, usually the center-to-center spread of the enclosures you are ganging. Mixing both lengths in one run is normal practice when the span does not divide evenly.
5) How heavy a gauge is the Square D RDB wireway, and how is it protected against corrosion?
The body is 16-gauge steel finished in gray polyester powder to ANSI 49, with galvanized steel listed as the base material. That combination is what carries it through outdoor exposure. Field-cut knockouts and drilled penetrations expose bare metal, so touch them up if the run sits in a coastal or wash-down location.
6) I need a trough length between 2 ft and 4 ft. What are my options besides the Square D RDB Series?
The Square D Square-Duct RDB Series comes in 2 ft and 4 ft troughs, both 6 in x 6 in. If the run needs an intermediate length, the Hoffman Econotrough F6636RTG is a galvanized steel wireway trough in a 36 in length. Note the Econotrough is a separate design from the Square D Square-Duct family, so covers and fittings are not shared between them.
7) What is the exact part number for Square D RDB raintight wireway?
Two Square D part numbers cover the 6 x 6 Square-Duct raintight trough: RDB62 for the 2 ft section and RDB64 for the 4 ft section. Both are made in Mexico.
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Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Square D RDB62 come with a warranty?
Absolutely. The Square D RDB62 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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