Southwire MCBGI-350 Grounding Bushing 3.5 in Malleable Iron

Product Description

The SOUTHWIRE MCBGI-350 is a 3.5-inch insulated malleable iron metallic grounding bushing designed for conduit service terminations. It pairs with an aluminum lay-in grounding lug to properly ground conduit runs in electrical installations. The thermoplastic throat liner is rated to 105 degrees C, protecting wire insulation from abrasion at the conduit entry point. Licensed electricians install this bushing during service entrance and branch circuit work where a reliable, code-compliant grounding path is required. UL listed construction meets standard requirements for metallic grounding hardware.

This bushing is suited for residential and commercial conduit installations where copper or aluminum bare ground conductors are used. It is commonly installed at panelboards, service entrances, and junction points where conduit terminates into an enclosure. The insulated throat design makes it appropriate for applications where protecting conductor insulation at the bushing entry is a code or spec requirement. It is available in trade sizes from 0.5 inches through 6 inches, making MCBGI-350 part of a complete grounding bushing product line.

Key Features

• 3.5-inch trade size malleable iron grounding bushing for conduit service terminations
• Thermoplastic throat liner rated to 105 degrees C protects wire insulation from damage
• Compatible with aluminum lay-in grounding lugs for copper or aluminum bare ground conductors
• High-grade malleable iron construction for durable, long-service performance
• UL listed for use in standard conduit grounding applications

Compatibility

Designed for use with copper or aluminum bare ground connectors and an accompanying aluminum lay-in grounding lug. Suitable for conduit service applications where insulated metallic grounding bushings are specified.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC). De-energize the circuit and lock out the service before beginning conduit termination work. Thread the bushing onto the conduit end and secure the grounding lug before pulling conductors. Avoid forcing conductors past the throat liner in a way that could compromise the insulating sleeve.

Technical Specifications

• Trade Size: 3.5 inches
• Material: Malleable Iron with Thermoplastic Throat Liner
• Throat Liner Rating: 105 degrees C
• Certifications: UL Listed
• Compatible Ground Conductor: Copper or Aluminum Bare

Standard Information

• Brand: SOUTHWIRE
• Manufacturer Part Number: MCBGI-350