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4 IN. OCT BX, NMSC CLAMP, ADJ. EARS
Manufacturer Resources
Product Specs
- Construction Element:
- Drawn
- Product Type:
- Box/housing for built-in mounting in the wall/ceiling
- Selling Unit Of Measure:
- each
- Standards:
- UL E2969
- Volume:
- 15.8 in³
- Department:
- Electrical
- Product Group:
- Boxes & Enclosures
- Product Subgroup:
- Electrical Boxes
- Product Type2:
- Octogonal Boxes
- Product Size:
- 4 Inches Diameter x 1/2 Inch depth
- Product Color:
- Silver
- Product Material:
- Steel
Steel City 54151 NE – Frequently Asked Questions
1) Does the Steel City 54151 NE octagon box have built-in cable clamps for NM (Romex)?
Yes. The 54151 NE is a 4 inch octagon box with NMSC clamps built in, so non-metallic sheathed cable lands directly in the box without separate connectors. Knockouts used with other wiring methods still need the appropriate fitting.
2) How many conductors can I legally put in a 4 inch octagon box with 15.8 cubic inches?
The 54151 NE holds 15.8 cubic inches. Under the standard box fill allowances, that works out to eight 14 AWG conductors (2.00 in3 each) or seven 12 AWG (2.25 in3 each) before any deductions, and every clamp, device, and group of grounds eats into that count. With the internal cable clamps you deduct one conductor volume based on the largest conductor present.
3) What are the adjustable ears on the Steel City 54151 NE for?
The adjustable ears let you set the box face flush with the finished wall or ceiling surface after the box is nailed or screwed to the stud or joist. That matters when drywall thickness varies or you're adding a layer, since the fixture canopy or device plate has to sit tight to the finish. This is the 4 inch drawn steel octagon box with NMSC clamps.
4) Is this octagon box UL listed?
Yes, the Steel City 54151 NE carries UL file E2969.
5) Is the 54151 NE metal or plastic, and can I use it to ground a metal fixture?
It's drawn steel, silver finish, not plastic. Being a metal box, it bonds to the equipment grounding system and a metal fixture strap bolted to it is grounded through the box, provided your grounding conductor is properly terminated in the box.
6) Should I use a 4 inch octagon box or a 4 inch square box for a ceiling light?
An octagon box like the 54151 NE matches the bolt pattern of most lighting fixture straps and takes a round or octagon ceiling cover, so it is the normal choice for a ceiling or wall lighting outlet. A 4 inch square box gives you more wire volume and accepts device rings for switches and receptacles, so use that where you need more conductors or a device in the same opening. This octagon is shallow at 1/2 inch deep with 15.8 cubic inches.
7) What is the exact part number and who makes the 4 inch octagon box with NMSC clamps and adjustable ears?
Steel City, manufacturer part number 54151 NE. It is made in Canada.
How fast can I get the Steel City 54151 NE 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 54151 NE come with a warranty?
Absolutely. The Steel City 54151 NE is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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