Bridgeport Fittings Heavy Duty...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,000.00
$99.79
Bridgeport Fittings Heavy Duty Insulated Grounding Bushings with Tin-Plated Aluminum Lug

Bridgeport Fittings Heavy Duty Insulated Grounding Bushings with Tin-Plated Aluminum Lug

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Model: BF-391

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

$1,000.00
$99.79
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Bridgeport Fittings Heavy Duty Insulated Grounding Bushings with Tin-Plated Aluminum Lug

Professional Conduit Termination & Grounding Solution

Bridgeport Fittings Heavy Duty Insulated Grounding Bushings deliver reliable conduit termination and electrical grounding for professional installations. Featuring malleable iron construction with zinc electroplating and a tin-plated aluminum alloy 6061-T6 grounding lug, these bushings provide maximum precipitation hardening and corrosion resistance for demanding electrical applications.

Professional Features & Benefits

  • Heavy Duty Wire Capacity: Accommodates larger conductor requirements for high-demand electrical installations and service applications.
  • Malleable Iron Construction: Provides superior strength and durability for secure conduit connections in professional electrical systems.
  • Zinc Electroplating: Delivers extended resistance to corrosion, ensuring long-term performance in various environmental conditions.
  • Tin-Plated Aluminum Alloy 6061-T6 Grounding Lug: Offers maximum precipitation hardening and optimal electrical conductivity for reliable grounding connections.
  • NEMA FB-1 Rating: Meets recognized electrical standards for professional installation confidence and code compliance.
  • UL Listed (E20412): OSHA-recognized, NRTL-certified electrical standards ensure safety and reliability in critical applications.
  • Grey with Black Insulator Design: Professional appearance with clear visual identification for proper installation and maintenance.

Technical Specifications

  • Country Of Origin: China
  • Department: Electrical
  • Division: Electrical H1
  • Field Application: Used with locknut to terminate service conduit to cabinet. Lug provided for bonding jumper to neut
  • Grounded Insulated: The tin-plated aluminum alloy 6061-T6 grounding lug provides maximum precipitation hardening and th
  • Nema Rating: FB-1
  • Product Color: Grey with Black Insulator
  • Product Finish: Zinc electro-plate. Grounding lug: Tin electro-plate
  • Product Material: Malleable Iron
  • Professional Performance: All Bridgeport fittings meet OSHA-recognized, NRTL-certified electrical standards and meets the str
  • Sub Division: Electrical-E H2
  • Ul File: E20412
  • Zinc Electroplating: Zinc electroplated body provides extended resistance to corrosion

Professional Applications

  • Service Entrance Conduit Termination
  • Electrical Panel and Cabinet Connections
  • Commercial Building Electrical Systems
  • Industrial Facility Installations
  • Multi-Unit Residential Properties
  • Professional Electrical Contractor Projects
  • Code-Compliant Grounding Applications

Why Choose Bridgeport Fittings Quality?

Bridgeport Fittings delivers proven reliability through OSHA-recognized, NRTL-certified electrical standards and UL listing (E20412). The combination of malleable iron construction, zinc electroplating, and precision-engineered grounding components ensures dependable performance and extended service life in professional electrical installations.

Manufacturer Resources

Product Specs

Department:
Electrical
Division:
Electrical H1
Nema Rating:
FB-1
Product Color:
Grey with Black Insulator
Product Finish:
Zinc electro-plate. Grounding lug: Tin electro-plate
Product Material:
Malleable Iron
Sub Division:
Electrical-E H2
Certifications:
E20412
Zinc Electroplating:
Zinc electroplated body provides extended resistance to corrosion
Product Type:
Grounding Bushing
Product Subgroup:
Grounding & Bonding
Product Group:
Grounding & Bonding

Bridgeport Fittings BF-391 – Frequently Asked Questions

1) What conduit sizes do the Bridgeport heavy duty insulated grounding bushings come in?
Three trade sizes: 3 inch (part 388-40), 5 inch (part 391) and 6 inch (part 392). These are the large-diameter sizes used on service entrance and feeder runs, so for anything smaller than 3 inch trade size you need a different Bridgeport bushing.
2) Do I need a locknut with an insulated grounding bushing, or does it come with one?
A locknut is required and is a separate item. The bushing is used with a locknut to terminate service conduit into a cabinet or panel, threading onto the conduit end with the locknut securing it to the enclosure wall. Plan on one locknut per termination in the matching trade size.
3) What is the grounding lug on these bushings actually for?
The lug is there to land a bonding jumper, typically run to the neutral or ground bar in the cabinet, so the metal raceway is bonded back to the service. It's tin-plated aluminum alloy 6061-T6, which handles the conductivity side while resisting corrosion at the connection.
4) Is this grounding bushing UL listed for an inspected commercial job?
It's UL Listed under file E20412 and carries a NEMA FB-1 rating, which is the fittings and boxes standard inspectors expect on conduit terminations. That combination is what you cite on a service entrance or panel termination in commercial and industrial work.
5) Will a malleable iron insulated grounding bushing hold up in a damp or outdoor service location?
The body is malleable iron with a zinc electroplate finish for extended corrosion resistance, and the lug is tin electro-plated. That's the standard finish package for service entrance and industrial terminations. It is a fitting finish, not an enclosure rating, so the enclosure itself still has to suit the environment.
6) Why use an insulated grounding bushing instead of a plain insulated bushing?
A plain insulated bushing only protects the conductors from the sharp conduit end. The grounding version does that and adds a lug so you can bond the raceway with a jumper. If the inspector wants the conduit bonded at the enclosure (common at service equipment and on concentric or eccentric knockouts), you want the grounding type, not the plain one.
7) Can these bushings take large service conductors?
Yes, they're the heavy duty wire capacity version, built for the larger conductors found on service entrance and feeder terminations rather than branch circuit work. That's the reason the range starts at 3 inch trade size.
8) What do these bushings look like once installed, for identifying them later?
Grey body with a black insulator, so the insulated throat is easy to spot on a walkthrough or during maintenance without pulling anything apart. Useful if you're standardizing terminations across a building and want them to read the same at every panel.
How fast can I get the Bridgeport Fittings BF-391 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 Bridgeport Fittings BF-391 come with a warranty?
Absolutely. The Bridgeport Fittings BF-391 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 Bridgeport Fittings BF-391?
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 Bridgeport Fittings BF-391 from ZenSupply?
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