SEPCO 27BIOLSS Threadless Insu...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$30.74
SEPCO 27BIOLSS Threadless Insulated Ground Bushing, Zinc-Plated Malleable Iron

SEPCO 27BIOLSS Threadless Insulated Ground Bushing, Zinc-Plated Malleable Iron

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Model: 27BIOLSS

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

$30.74
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SEPCO 27BIOLSS Threadless Insulated Ground Bushing, Zinc-Plated Malleable Iron

The SEPCO 27BIOLSS Threadless Insulated Ground Bushing is a zinc-plated malleable iron grounding fitting designed for reliable equipment grounding at conduit and raceway terminations, available in 3-Inch and 4-Inch trade sizes to cover larger panelboard, enclosure, and junction box connections. Its threadless design speeds installation onto conduit runs, while the insulated throat protects conductor insulation from abrasion and maintains a continuous, low-resistance ground path back to the enclosure. Built for commercial and industrial electricians, this ground bushing is engineered to withstand repeated handling, conductor pulls, and routine maintenance across both the 3-Inch and 4-Inch sizes in the SEPCO 27BIOLSS lineup.

Key Features

  • Trade Size Range: Offered in 3-Inch and 4-Inch trade sizes for larger conduit terminations at panelboards, enclosures, and junction boxes.
  • Insulated Throat: A smooth, insulated bore shields conductor insulation from abrasion and cutting at the termination point while preserving continuous, low-resistance grounding back to the enclosure.
  • Durable Malleable Iron Construction: The solid malleable iron body resists impact, distortion, and rough jobsite handling far better than lightweight stamped alternatives, holding its shape through installation and service life.
  • Zinc-Plated Finish: The zinc-plated coating adds corrosion resistance, helping the bushing resist rust and maintain a clean, dependable ground connection over time.
  • Threadless Design: A threadless connection simplifies installation onto conduit runs without matched threading, speeding up rough-in and reducing fit-up time in the field.
  • Reliable Grounding Continuity: As a dedicated ground bushing, the 27BIOLSS helps maintain equipment grounding continuity at conduit terminations, a key requirement for safe, code-compliant electrical systems.

Technical Specifications

  • Trade Size: 3-Inch - 4-Inch

Typical Applications

  • Commercial and Industrial Electrical Installations
  • Conduit and Raceway Grounding
  • Panelboard and Enclosure Terminations
  • Junction Box and Cabinet Wiring
  • Renovation and New Construction Wiring

Why SEPCO?

SEPCO manufactures electrical fittings built for dependable field performance, and the 27BIOLSS ground bushing carries that standard forward with a solid malleable iron body, a protective zinc-plated finish, and an insulated, threadless design spanning 3-Inch and 4-Inch sizes for larger conduit runs. This focus on practical jobsite installation without sacrificing durability is what contractors expect from a grounding component. Electrical contractors rely on SEPCO components for consistent quality on conduit and grounding installations where durability and code-compliant performance matter.

Manufacturer Resources

SEPCO Product Catalog

Product Specs

list_batch:
SEP-20260911
Product Type:
Grounding Bushing
Product Finish:
Zinc-Plated
Connection Type:
Threadless
Department:
Electrical
Product Group:
Grounding & Bonding
Product Subgroup:
Grounding & Bonding
Product Material:
Malleable Iron

SEPCO 27BIOLSS – Frequently Asked Questions

1) What trade sizes does the SEPCO 27BIOLSS insulated ground bushing come in?
The SEPCO 27BIOLSS ground bushing family covers 3-inch and 4-inch trade sizes, with 27BIOLSS being the 3-inch part and 29BI4OLSS the 4-inch. Those are the sizes you want for larger feeder runs landing at panelboards, enclosures and junction boxes. For smaller conduit you would need a different size bushing entirely, since a ground bushing has to match the conduit trade size it lands on.
2) Does a threadless ground bushing work on rigid conduit with threaded ends?
The 27BIOLSS is a threadless connection type, so it clamps onto the conduit rather than threading onto it. That means you don't need matched, cut threads at the termination, which is the usual reason electricians reach for a threadless bushing on a field-cut run. If your spec calls for a threaded bushing to land on an existing threaded rigid nipple, this is not the fitting for that detail.
3) What does the insulated throat on this ground bushing actually do?
The insulated bore gives the conductors a smooth surface to pass over at the conduit termination, so the insulation isn't cut or abraded during the pull or by vibration in service. At the same time the malleable iron body keeps a continuous low-resistance ground path from the raceway back to the enclosure. It is the standard way to protect large feeder conductors where they leave the conduit into a panel or cabinet.
4) Is malleable iron a better choice than a stamped steel ground bushing for industrial work?
For rough handling, malleable iron is the sturdier option. The 27BIOLSS uses a solid malleable iron body that holds its shape through installation and conductor pulls rather than distorting the way a lightweight stamped fitting can. That matters most on 3-inch and 4-inch terminations where the fitting takes real load from heavy feeders. Stamped or die-cast bushings are lighter and fine on small conduit in dry, protected locations.
5) Do I still need a grounding conductor and lug if I install this insulated ground bushing?
A ground bushing is the bonding point at the raceway termination, not a substitute for the bonding jumper your design calls for. The 27BIOLSS maintains equipment grounding continuity at the conduit termination back to the enclosure; the grounding conductor, lug hardware, and any bonding jumper are separate items to order with it. Plan that into your material list so the termination is complete at rough-in.
6) Can I standardize on one ground bushing across 3-inch and 4-inch feeder terminations in a building?
You can standardize on the 27BIOLSS line, but you order by trade size: 27BIOLSS for 3-inch conduit and 29BI4OLSS for 4-inch. Same material, finish and threadless insulated design across both, so the install detail and the look at the panel stay consistent while each fitting matches its conduit size.
7) Will a zinc-plated ground bushing hold up in a damp mechanical room or outdoor enclosure?
The zinc plating on the 27BIOLSS adds corrosion resistance so the bushing resists rust and keeps a clean ground connection over time. That suits interior commercial and industrial spaces including damp mechanical rooms. For continuous salt spray or aggressive chemical exposure, most specs push toward a corrosion-rated or non-ferrous fitting instead.
How fast can I get the SEPCO 27BIOLSS 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 27BIOLSS come with a warranty?
Absolutely. The SEPCO 27BIOLSS 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 27BIOLSS?
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 27BIOLSS from ZenSupply?
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