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

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.