1/2″-1″ Grounding Clamp

Mars 85374 – Grounding Clamp for 1/2″ to 1″ Pipe Applications

The Mars 85374 grounding clamp is designed for bonding bare or insulated grounding conductors to metallic water pipe, conduit, or structural steel in accordance with NEC Article 250. Engineered for secure mechanical and electrical connection, this clamp accommodates pipe sizes ranging from 1/2″ to 1″, making it a suitable option for residential, commercial, and light industrial grounding systems.

Constructed from corrosion-resistant materials and designed for ease of installation, this clamp ensures a low-impedance path to ground for equipment grounding and lightning protection systems. It is suitable for both interior and exterior installations where bonding to metal piping is required for system continuity and code compliance.

Key Product Features

• ✅ Pipe Compatibility: Designed for bonding to copper, galvanized, or steel pipe from 1/2″ to 1″ nominal size.
• ✅ UL Listed – Meets UL 467 standards for grounding and bonding equipment.
• ✅ Bronze Alloy Body – Cast construction for mechanical durability and long-term corrosion resistance.
• ✅ Threaded Grounding Terminal – Accepts grounding conductors up to #10 solid or stranded copper per listing.

Technical Specifications

• Material: Bronze or copper alloy clamp body with stainless steel fasteners
• Conductor Range: Accepts up to #10 AWG grounding wire (check model-specific listing)
• Pipe Range: 1/2″ through 1″ nominal diameter metallic pipe
• Compliance: UL 467 listed for grounding and bonding applications

Installation Considerations

The clamp should be installed using appropriate torque to ensure solid mechanical engagement without damaging the pipe or conductor. Bonding conductors should be secured using approved connectors or lay-in lugs as required by code. Pipe surface must be free of paint or corrosion at the connection point to ensure electrical continuity.

This product is intended for permanent installations in grounding electrode systems, bonding jumpers, or supplemental bonding pathways. Always refer to the latest version of the NEC and local authority requirements when selecting and installing grounding hardware.

Application Scope

Used in residential service entrances, commercial mechanical rooms, telecommunications bonding, and equipment grounding in accordance with NEC 250. Suitable for bonding to cold-water lines, gas piping (with isolators per code), and metallic conduit systems where grounding continuity is required.

Notable Attributes

• ✅ Compatible with round metallic pipe from 1/2″ to 1″ OD
• ✅ Tool-secured stainless steel set screws for long-term hold
• ✅ Copper alloy construction for chemical resistance in damp environments
• ✅ Compact profile suitable for confined junction boxes or chase runs

Contractor Notes

Verify conductor size and type for clamp terminal rating prior to field use. Ensure bare conductor bonding applications avoid painted or non-conductive pipe surfaces. For exterior or underground installations, confirm compatibility with environmental exposure or use additional corrosion mitigation measures as required by project specs.