SEPCO ST10 Series Polypropylen...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$0.14
SEPCO ST10 Series Polypropylene Insulated Plastic Bushing

SEPCO ST10 Series Polypropylene Insulated Plastic Bushing

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Model: ST10

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

$0.14
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SEPCO ST10 Series Polypropylene Insulated Plastic Bushing

The SEPCO ST10 Polypropylene Insulated Plastic Bushing is a non-conductive fitting engineered to protect conductor insulation wherever wires pass through conduit ends, enclosure knockouts, or equipment openings. Molded from durable polypropylene, this insulated bushing series is available in trade sizes ranging from 1/2" through 4" (1/2", 3/4", 1", 1-1/4", 1-1/2", 2", 2-1/2", 3", 3-1/2", and 4"), covering the full range of conduit terminations and enclosure knockouts encountered on the job. Because the bushing body is plastic rather than uncoated metal, it adds a non-conductive insulating barrier between conductors and the surrounding raceway or enclosure, supporting safer, code-conscious electrical installations.

Key Features

  • Trade Size Range: available from 1/2" through 4", sized to match the full range of conduit terminations and enclosure knockouts on a job.
  • Durable Construction: molded from durable, non-conductive polypropylene plastic for long-lasting performance and corrosion resistance across every size in the series.
  • Insulated Design: the insulated bushing body creates a protective barrier between conductors and metal conduit or enclosure edges, reducing the risk of insulation damage.
  • Plastic Bushing Type: the SEPCO ST10 is a dedicated insulated plastic bushing, purpose-built as a wire-protection fitting rather than a general-purpose part.
  • Smooth, Rounded Profile: the bushing's contoured surface helps guide conductors through openings without introducing sharp edges that could nick or abrade wire jackets.
  • Lightweight, Non-Metallic Material: polypropylene construction is lighter than comparable metal bushings, simplifying handling and installation on the jobsite.
  • Corrosion Resistance: unlike uncoated steel or iron fittings, the plastic body will not rust, making it well suited to installations where moisture exposure is a concern.

Technical Specifications

  • Trade Size Range: 1/2" - 4" (10 sizes: 1/2", 3/4", 1", 1-1/4", 1-1/2", 2", 2-1/2", 3", 3-1/2", 4").
  • Material: Polypropylene.
  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Conduit and Raceway Terminations
  • Panelboard and Enclosure Knockout Protection
  • Commercial and Industrial Electrical Installations
  • Wire and Cable Pulling Applications
  • Renovation and New Construction Electrical Work

Why SEPCO?

SEPCO builds the ST10 insulated plastic bushing series from durable polypropylene to give electrical professionals a dependable, non-conductive option for protecting conductor insulation at conduit and enclosure openings, across trade sizes from 1/2" through 4". The corrosion-resistant plastic construction is a practical alternative to metal bushings in installations where insulation and weight matter, helping installers complete clean, code-conscious electrical work with confidence in the SEPCO name.

Manufacturer Resources

SEPCO Product Catalog

Product Specs

list_batch:
SEP-20260911
Product Type:
Conduit Bushing
Department:
Electrical
Product Group:
Conduit & Raceway
Product Subgroup:
Conduit Fittings
Product Material:
Polypropylene

SEPCO ST10 – Frequently Asked Questions

1) What trade sizes does the SEPCO ST10 insulated plastic bushing come in?
Ten trade sizes, 1/2 inch through 4 inch: 1/2, 3/4, 1, 1-1/4, 1-1/2, 2, 2-1/2, 3, 3-1/2 and 4 inch. The part number steps up with the size, so 1/2 inch is ST10, 3/4 inch is ST11, 1 inch ST12, 1-1/4 ST13, 1-1/2 ST14, 2 inch ST15, 2-1/2 ST16, 3 inch ST17, 3-1/2 ST18 and 4 inch ST19. Order by the conduit trade size, not by the measured OD of the pipe.
2) Will a plastic bushing like the SEPCO ST10 work on a rigid conduit end inside a panelboard?
That is what it is built for. The ST10 series threads onto conduit ends and enclosure knockouts to give conductors a rounded, non-conductive surface to pass over instead of a raw metal edge. Typical uses listed for it are conduit and raceway terminations, panelboard and enclosure knockout protection, and wire pulling. Match the bushing trade size to the conduit trade size (1/2 inch through 4 inch available).
3) Should I use a plastic insulated bushing or a metal bushing on a conduit termination?
The difference is the body material and what it does to conductors. The SEPCO ST10 is molded polypropylene, so the bushing itself is non-conductive and puts an insulating barrier between the wire and the metal raceway or enclosure edge. A metal bushing gives you mechanical strength but no insulating value and, if uncoated, can rust. Where moisture is a concern or where you want the insulating barrier at the opening, the plastic bushing is the one to specify.
4) Is the SEPCO ST10 bushing OK in damp or washdown areas where steel fittings corrode?
Yes. The body is polypropylene, so there is nothing to rust the way an uncoated steel or iron fitting would. That makes it a reasonable choice for terminations exposed to moisture, in mechanical rooms, parking structures and similar locations. It is still a wire-protection fitting, not a sealing or liquidtight fitting, so it does not keep water out of the raceway.
5) I'm stocking a service truck for commercial electrical work. Which ST10 sizes cover most jobs?
The series spans 1/2 inch to 4 inch in ten sizes, and the small end carries most branch circuit work: ST10 (1/2 inch), ST11 (3/4 inch), ST12 (1 inch) and ST13 (1-1/4 inch). Feeder and service runs pull from the larger end, ST15 (2 inch) up through ST19 (4 inch). Because all ten sizes are the same polypropylene part in one series, you can standardize a facility or an MRO crib on a single bushing type across every conduit size on site.
6) What keeps the ST10 bushing from nicking wire jackets during a big pull?
The bushing has a contoured, rounded profile at the mouth, so conductors ride over plastic rather than a cut conduit edge or a sharp knockout lip. That is why it shows up in wire and cable pulling applications as well as finished terminations. On a long or heavy pull, size the bushing to the conduit so the radius sits where the cable actually bears.
How fast can I get the SEPCO ST10 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 ST10 come with a warranty?
Absolutely. The SEPCO ST10 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 ST10?
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 ST10 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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