SEPCO C23 3/8-Inch Die-Cast Zi...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$3.51
SEPCO C23 3/8-Inch Die-Cast Zinc Romex Connector

SEPCO C23 3/8-Inch Die-Cast Zinc Romex Connector

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Model: C23

In Stock (leaves warehouse same day if ordered before 3pm ET)

$3.51
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SEPCO C23 3/8-Inch Die-Cast Zinc Romex Connector

The SEPCO C23 is a 3/8-Inch die-cast zinc Romex connector engineered to secure nonmetallic (NM) sheathed cable as it enters electrical boxes, panels, and enclosures. Its die-cast zinc body delivers the strength and corrosion resistance electricians rely on for residential and light commercial wiring work, while the 3/8-Inch sizing matches standard knockouts found on common junction boxes and panels. As a dedicated Romex connector, the SEPCO C23 clamps down on the outer jacket of NM cable to hold the run firmly in place at the point of entry, helping keep the cable seated and protected from abrasion where it passes through the box wall. It is a straightforward, purpose-built component for electricians who need a reliable mechanical connection between NM cable and a metal or nonmetallic enclosure.

Key Features

  • Trade Size: 3/8-Inch sizing is designed to match standard knockouts on electrical boxes, panels, and enclosures for a proper, secure fit.
  • Durable Die-Cast Zinc Construction: The die-cast zinc body resists corrosion and holds up to repeated handling, making it suitable for both new installations and retrofit work.
  • Romex/NM Cable Connector: Purpose-built to secure nonmetallic (NM) sheathed cable at the point of entry into a box or enclosure, keeping the cable jacket clamped and seated in place.
  • Box & Enclosure Compatible: Designed to connect NM cable runs into junction boxes, panelboards, switch boxes, and other standard electrical enclosures.
  • Compact, Low-Profile Design: The 3/8-Inch profile fits tight box and panel layouts without crowding adjacent knockouts or wiring.
  • Straightforward Installation: Mechanical clamp design allows the connector to be seated in a knockout and tightened onto the NM cable without specialty tools.
  • Consistent Zinc Finish: Die-cast zinc construction provides a consistent, uniform finish across the connector body and locknut.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Nonmetallic (NM) Cable Entry into Boxes and Panels
  • Residential Branch Circuit Wiring
  • Light Commercial Electrical Installations
  • Junction Box and Switch Box Wiring
  • Panelboard and Enclosure Cable Entry
  • Renovation and New Construction Electrical Work

Why SEPCO?

SEPCO builds the C23 Romex connector from die-cast zinc for a combination of strength and corrosion resistance that stands up to demanding jobsite conditions. The compact 3/8-Inch profile gives electricians a dependable, purpose-fit way to secure NM cable into boxes and enclosures without adding bulk to a crowded panel or junction box. For contractors and maintenance electricians who need a straightforward, no-nonsense Romex connector for everyday NM cable terminations, the SEPCO C23 offers a durable, well-fitted solution sized specifically for 3/8-Inch knockouts.

Manufacturer Resources

SEPCO Product Catalog

Product Specs

list_batch:
SEP-20260911
Product Type:
Cable Connector
Department:
Electrical
Product Group:
Conduit & Raceway
Product Subgroup:
Conduit Fittings
Product Material:
Die-Cast Zinc
Product Size:
3/8"

SEPCO C23 – Frequently Asked Questions

1) Will the SEPCO C23 fit a 3/8-inch knockout on a standard junction box or panel?
Yes. The C23 is a 3/8-inch trade size connector, which is the common knockout size on junction boxes, switch boxes, panelboards, and other standard enclosures. It seats in the knockout and is secured with its locknut on the inside of the box.
2) Is the C23 for NM/Romex cable or for flexible metal conduit?
It is a Romex connector, built to clamp the outer jacket of nonmetallic (NM) sheathed cable where it enters a box or enclosure. It is not a flex or armored cable connector. If you are terminating flexible metal conduit or AC/MC cable, you need a connector made for that cable type instead.
3) Can I use this connector on a plastic box, or metal boxes only?
Either. The C23 makes a mechanical clamp between NM cable and a metal or nonmetallic enclosure, so it works on steel junction boxes, panelboards, and nonmetallic boxes with a 3/8-inch knockout.
4) What is the SEPCO C23 made of, and will it hold up in a damp or corrosive location?
Die-cast zinc, body and locknut, which resists corrosion and takes repeated handling on retrofit work. Zinc gives you better corrosion resistance than plain steel for garages, basements, and utility spaces, though it is not a substitute for a fitting specifically listed for wet or hazardous locations.
5) What part number do I order for the SEPCO 3/8-inch zinc Romex connector?
Order SEPCO model C23. That is the manufacturer part number for the 3/8-inch die-cast zinc Romex connector, and it is the only model on this product.
6) Do I need any special tools to install the C23 Romex connector?
No. It is a mechanical clamp design: drop it into the knockout, run the cable through, and tighten the clamp onto the NM jacket. Standard hand tools are all it takes, no crimper or specialty die.
7) Will the C23 crowd the other knockouts in a tight panel?
The 3/8-inch body is low profile and intended to sit in crowded panel and junction box layouts without interfering with adjacent knockouts or the conductors routed past it. For a panel with several NM homeruns landing side by side, that is the point of using the small trade size rather than a larger fitting.
8) Is this the right connector for residential branch circuits or is it a commercial-duty fitting?
Both, within reason. The C23 is aimed at residential branch circuit wiring and light commercial installations, junction and switch box wiring, and panelboard cable entry, on new construction and renovation alike. Heavier industrial raceway work calls for a fitting matched to that conduit system instead.
How fast can I get the SEPCO C23 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
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 SEPCO C23 come with a warranty?
Absolutely. The SEPCO C23 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the SEPCO C23?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the SEPCO C23 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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