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Manufacturer Resources
Product Specs
- Country Of Origin:
- United States
- Number Of Knockouts:
- 17
- Product Type:
- Outlet Box
- Selling Unit Of Measure:
- each
- Standards:
- UL E2969
- Volume:
- 21 in³
- Department:
- Electrical
- Product Group:
- Boxes & Enclosures
- Product Subgroup:
- Electrical Boxes
- Product Type2:
- Outlet Boxes
- Product Size:
- 4 Inches Height x 4 Inches Width x 1-1/2 Inches depth
- Product Color:
- Silver
- Product Material:
- Steel
Steel City 521511234EW – Frequently Asked Questions
1) What size conduit do the knockouts on the Steel City 521511234EW 4-inch square box take?
The 521511234EW is built with combination 1/2 and 3/4 inch eccentric knockouts, so a single opening accepts either trade size without an adapter. There are 17 knockouts in total across the box, which gives plenty of feed and switch-leg options on a crowded wall or ceiling run.
2) How many conductors can I legally put in a 21 cubic inch 4-inch square steel box?
The box holds 21 cubic inches of volume, which is the number you work your box fill from. At the NEC allowance of 2.00 cubic inches per 14 AWG conductor that is ten conductors, and at 2.25 cubic inches per 12 AWG it is nine, before you subtract for devices, clamps, and grounds. Pick a deeper 4-inch square or add a raised cover if the count runs over.
3) What are the exact dimensions of this Steel City 4-inch square box, and will it fit in a 2x4 stud bay?
It measures 4 inches high by 4 inches wide with a 1-1/2 inch depth. That depth clears easily inside a 2x4 stud wall (3-1/2 inch cavity) and leaves room behind the box for cable looping.
4) Can the Steel City 521511234EW 4 inch square box be used outdoors on an exterior wall?
The 521511234EW is a 4 inch square steel outlet box, 4 inches high by 4 inches wide by 1-1/2 inches deep, with 17 knockouts and 21 cubic inches of volume, intended for dry interior work. For a wet exterior location, a weatherproof box such as the Mulberry Royal Mountie die-cast aluminum 1-gang weatherproof box is built for that duty, and the Thomas & Betts 2IH3-1 Red-Dot 2-gang conduit outlet box with three 1/2 inch hubs is a threaded-hub alternative where conduit lands directly on the box.
5) What should I use instead of a Steel City 4 inch square steel box in a hazardous or classified area?
The Steel City 521511234EW is a steel outlet box with knockouts for standard occupancies and carries UL E2969. Classified locations call for an explosionproof enclosure instead: Appleton's GRJ series explosionproof malleable iron conduit outlet box and the GRJS universal explosionproof malleable iron box are built for that service, with the GRT75 malleable iron round conduit outlet box covering round-body applications.
6) Is this 4-inch square box UL listed for commercial work?
Yes. The 521511234EW carries UL file E2969, which is the listing inspectors look for on a steel outlet box in commercial and institutional installations.
7) Is a steel 4-inch square box or a PVC box the right choice for my job?
Steel is the standard for commercial raceway work: it bonds through the conduit system, takes EMT and rigid connectors in its knockouts, and stands up to abuse in exposed areas. If you are wiring residential nonmetallic cable and want a nonconductive, multi-gang box, the Cantex EZ Series PVC residential outlet box is the alternative. For a classified or hazardous area neither applies, and you would move to an explosionproof malleable iron box like the Appleton GRJ or GRJS Series.
8) Does this 4-inch square box come with a cover or mounting bracket?
It is sold as the box only, one each. A flat or raised device cover is a separate order, and the cover you choose also matters for fill, since a raised cover adds usable volume to the 21 cubic inches of the box itself.
9) Will a Steel City 4 inch square box work for a range or dryer receptacle?
The 521511234EW is a general-purpose 4 inch square steel box with 21 cubic inches of volume and 1/2 and 3/4 inch knockouts. For a dedicated range or dryer outlet, the Pass & Seymour P242RRD thermoplastic range and dryer box is purpose-built for that device.
How fast can I get the Steel City 521511234EW delivered?
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Can I return it if it doesn’t work for me?
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 Steel City 521511234EW come with a warranty?
Absolutely. The Steel City 521511234EW is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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