Bridgeport Fittings 330-B Nylo...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$10.61
Bridgeport Fittings 330-B Nylon Plastic Insulating Bushing, 4"

Bridgeport Fittings 330-B Nylon Plastic Insulating Bushing, 4"

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Model: 326-B

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

$10.61
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Bridgeport Fittings 330-B Nylon Plastic Insulating Bushing, 4"

The Bridgeport Fittings 330-B is a 4" nylon plastic insulating bushing built for use with a locknut to protect conductor insulation as wires pass through conduit openings and enclosure knockouts. Molded from durable nylon plastic, the 330-B shields wire insulation from abrasion against sharp metal edges at the ends of conduit runs, helping electricians maintain a clean, damage-free pull and a safer overall installation. Sized for 4" trade size conduit, this bushing is intended to be installed together with a locknut, which secures the bushing firmly against the enclosure wall or conduit termination point. The nylon plastic construction offers a lightweight, non-metallic alternative to steel bushings while still providing dependable insulating performance in a wide range of electrical enclosures, panels, and raceway systems. Bridgeport Fittings designs the 330-B as a straightforward, purpose-built solution for protecting conductor insulation wherever a nylon insulating bushing and locknut combination is specified.

Key Features

  • Trade Size: Manufactured in 4" trade size to match 4" conduit and enclosure knockout openings.
  • Durable Nylon Construction: Molded nylon plastic material resists abrasion, corrosion, and everyday wear, providing long-lasting insulating protection for conductors.
  • Locknut-Compatible Design: Engineered to be used together with a locknut, which holds the bushing securely in place at the conduit opening or enclosure knockout.
  • Conductor Insulation Protection: The smooth interior bore of the bushing shields wire insulation from sharp metal edges as conductors pass through conduit terminations.
  • 150°C Temperature Rating: Rated for use in applications up to 150°C, supporting demanding commercial and industrial electrical environments.
  • Non-Metallic Alternative: Nylon plastic construction offers a lightweight, non-conductive option compared to traditional metal bushings.
  • Trade Size Compatibility: Designed specifically for 4" trade size applications, ensuring a proper fit at matching conduit terminations and enclosure openings.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Conduit and Raceway Systems
  • Panelboard, Switchboard, and Enclosure Knockout Protection
  • Commercial and Industrial Electrical Installations
  • Conductor Pulls Requiring Insulated Bushing Protection
  • Wire and Cable Pulling Protection
  • New Construction and Electrical Renovation Projects

Why Bridgeport Fittings?

Bridgeport Fittings engineers electrical fittings from durable, application-appropriate materials, and the 330-B insulating bushing is molded from nylon plastic to protect conductor insulation at conduit terminations. Rated for use up to 150°C and designed to be installed with a locknut, the 330-B is built to deliver dependable, code-compliant insulating performance for 4" conduit connections in commercial and industrial electrical work. Choosing a purpose-built insulating bushing like the 330-B helps electricians safeguard wire insulation and support a longer service life for the overall conductor installation. For installers who need a reliable nylon insulating bushing sized to match 4" conduit, the Bridgeport Fittings 330-B offers a straightforward, purpose-built solution backed by the Bridgeport Fittings name.

Manufacturer Resources

Product Specs

list_batch:
BPF-20260918
Product Subgroup:
Conduit Fittings
Department:
Electrical
Product Type:
Bushing
Product Material:
Nylon
Product Group:
Conduit & Raceway

Bridgeport Fittings 326-B – Frequently Asked Questions

1) What conduit trade sizes do the Bridgeport Fittings nylon insulating bushings come in?
Two trade sizes are offered: 2 inch (part 326-B) and 4 inch (part 330-B). Match the bushing to the trade size of the conduit or knockout you are terminating, not to the conductor size.
2) Does the Bridgeport 330-B bushing include a locknut, or do I have to order one separately?
No locknut is included. The 330-B is built to be installed together with a locknut that clamps the bushing against the enclosure wall or conduit termination, so you need to add a 4 inch locknut to the order to complete the termination.
3) Is the Greenlee 3037AV bushing an alternative to the Bridgeport 326-B or 330-B insulating bushing?
No. The Greenlee 3037AV is a replacement bushing for the 730EBB cable bender, so it is a service part for a bending tool rather than a conduit fitting. The Bridgeport Fittings insulating bushings, 326-B in 2 inch and 330-B in 4 inch trade size, are molded nylon bushings installed with a locknut at a conduit termination or enclosure knockout to shield conductor insulation from sharp metal edges. The two serve different purposes and are not interchangeable.
4) Is a nylon insulating bushing OK in a high temperature panel, or do I need a metal one?
The Bridgeport nylon bushings are rated for use up to 150 degrees C, which covers typical commercial and industrial panelboard and switchboard work. Above that rating, or where a job spec calls out a metallic insulated throat bushing, go to a metal-bodied bushing instead.
5) What does an insulating bushing actually do on a conduit termination?
It gives the conductors a smooth, non-metallic bore to pass over instead of the cut edge of the conduit or the raw edge of a knockout. On a 4 inch run with large conductors, that edge is exactly where insulation gets sliced during a pull. The nylon body of the 330-B takes the abrasion instead.
6) Can I use a 2 inch nylon bushing on a 4 inch knockout by stacking a reducing washer?
No. The bushing has to match the trade size of the opening it threads onto. Use the 326-B on 2 inch conduit and the 330-B on 4 inch conduit; if you are reducing an enclosure knockout, handle that with reducing washers and then fit the bushing to the conduit size actually landing in the box.
7) If I need a bushing for a cable bender rather than a conduit opening, which one should I order?
For a cable bender, the Greenlee 3037AV is the replacement bushing for the 730EBB bender. The Bridgeport Fittings 326-B and 330-B are nylon insulating bushings sized for 2 inch and 4 inch trade size conduit and are used with a locknut at enclosure knockouts and conduit terminations, so they will not serve as a tool part.
8) Is nylon acceptable for a plastic bushing, or does corrosion in a damp electrical room matter?
Nylon does not corrode, which is part of why it is used here rather than steel. The molded nylon body resists abrasion, corrosion and general wear, and it is non-conductive, so it adds no metal path at the termination.
9) Can I standardize on one bushing type across panels, switchgear and raceway in a facility?
For 2 inch and 4 inch terminations, yes. Both the 326-B and 330-B are the same nylon insulating bushing design used with a locknut, and they cover panelboard, switchboard and enclosure knockouts as well as conduit and raceway runs in commercial and industrial work. Other trade sizes on the same building will need the matching size bushing.
How fast can I get the Bridgeport Fittings 326-B 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 326-B come with a warranty?
Absolutely. The Bridgeport Fittings 326-B 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 326-B?
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
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