3M 7000031404 Copper Long Barrel Lug 350 Kcmil 35 Kv

Product Description

The 3M 7000031404 is a copper one-hole long barrel lug rated for use up to 35 kV on copper conductors only. Manufactured as a single-piece, seamless, high-conductivity copper compression lug, it provides a reliable, low-resistance termination point for heavy-gauge conductors. The lug features a 0.700-inch inner diameter, a barrel length of 3.840 inches, and a 1/2-inch stud size. Licensed electricians and utility linemen use this lug in medium-voltage power distribution and feeder termination applications where secure, code-compliant connections are required.

This lug is suited for medium-voltage electrical installations, including commercial, industrial, and utility-grade distribution systems. Its long barrel design accommodates 350 kcmil copper conductors and provides additional surface area for compression crimping, reducing the risk of conductor pullout or connection failure. It is installed where conductors terminate at switchgear, transformers, or bus bar assemblies operating at voltages up to 35 kV.

Key Features

• One-piece seamless construction using high-conductivity copper for reliable electrical performance
• Rated up to 35 kV for medium-voltage distribution applications
• Long barrel design at 3.840 inches accommodates 350 kcmil copper conductors
• Inner diameter of 0.700 inches sized for a consistent, compression-ready fit
• Single-hole mounting with 1/2-inch stud size for secure panel or bus bar attachment
• For use on copper conductors only — not rated for aluminum

Compatibility

Designed for use with 350 kcmil copper conductors in medium-voltage systems rated up to 35 kV. For copper conductors only.

Installation Notes

Installation should be performed by a licensed electrician familiar with medium-voltage termination procedures and applicable NEC requirements. De-energize and lock out the circuit before beginning any termination work. Use a calibrated compression tool rated for the conductor size and lug type to ensure a proper crimp. Do not use this lug on aluminum conductors.

Technical Specifications

• Conductor Material Compatibility: Copper only
• Conductor Size: 350 kcmil
• Voltage Rating: Up to 35 kV
• Inner Diameter: 0.700 inches
• Barrel Length: 3.840 inches
• Stud Size: 1/2 inch
• Number of Holes: 1
• Material: Seamless high-conductivity copper
• Weight: 0.27 pounds
• Unit of Measure: Each
• Minimum Order Quantity: 10

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7000031404