3M 7000031378 Copper Barrel Connector 350 Kcmil 35 Kv

Product Description

The 3M 7000031378 is a copper standard barrel connector designed for splicing copper conductors in medium-voltage applications up to 35 kV. Built from one-piece, seamless, high-conductivity copper, this connector delivers reliable electrical continuity without the weak points common in multi-piece designs. It measures 2.380 inches in length with an inner diameter of 0.700 inches, making it suited for 350 kcmil conductors. The red color coding aids quick identification during installation. Licensed electricians and utility contractors install this type of connector in underground and overhead cable splicing work where maintaining conductor integrity at elevated voltage ratings is critical.

This barrel connector is intended for use on copper conductors only and is rated for medium-voltage systems up to 35 kV. It is appropriate for utility distribution, industrial power, and commercial electrical installations where 350 kcmil copper cable is specified. The connector is sold individually and is typically installed as part of a cold-shrink or heat-shrink splice kit assembly, though it functions as a standalone mechanical and electrical joining component.

Key Features

• One-piece seamless construction eliminates potential failure points at seams or welds
• High-conductivity copper material maintains low-resistance splice connections
• Rated for medium-voltage applications up to 35 kV
• Sized for 350 kcmil copper conductors with a 0.700-inch inner diameter
• Red color coding for fast conductor size identification in the field

Compatibility

Designed for use with 350 kcmil copper conductors only. Not suitable for aluminum conductors. Compatible with medium-voltage splicing applications up to 35 kV.

Installation Notes

Installation should be performed by a qualified electrician following applicable NEC requirements and local codes for medium-voltage conductor splicing. De-energize and verify the absence of voltage on all conductors before beginning any splice work. Use the appropriate crimping tool specified for the conductor size and connector type to achieve a proper mechanical and electrical connection. Do not use this connector on aluminum conductors.

Technical Specifications

• Conductor Type: Copper only
• Conductor Size: 350 kcmil
• Voltage Rating: Up to 35 kV
• Length: 2.380 inches
• Inner Diameter: 0.700 inches
• Material: One-piece seamless high-conductivity copper
• Color: Red
• Weight: 0.19 pounds
• UPC: 00054007128731

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7000031378