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NSI Industries L350N - 2Hole Long Barrel Copper Compression Lug350 MCM-1/2" Bolt Long Barrel Copper Compression Lugs is a type of copper compression connector that is produced from high conductivity copper tubing. They are tin-plated to provide corrosion resistance and are marked with die index and color coded for easy reference. Listed for 35KV maximum when properly installed.

NSI Industries L350N 2Hole Long Barrel Copper Compression Lug350 MCM-1/2" Bolt Long Barrel Copper Compression…

UPC: 662381035158


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Technical BulletinInstallation Instructions

Contact for Pricing

Minimum Qty: 12

Multiplier: 12

*Contact for lower quantities*

Call +1 (262) 252-1600 (toll-free 877-268-3700) or email [email protected] for pricing and availability.

Overview

The NSI Industries L350N is a high-conductivity copper compression lug engineered for secure, long-lasting electrical terminations in high-voltage applications. Manufactured from premium copper tubing with tin plating, this lug delivers superior corrosion resistance and low contact resistance, ensuring reliable performance in demanding environments. Designed for 350 MCM copper conductors, the L350N features a long barrel for secure termination and a 1/2" bolt size for robust mounting. The red color coding and die index marking enable quick identification and installation, while the two-hole design provides enhanced stability and load distribution. This lug is UL486A listed as a wire connector and UL467 listed for grounding and bonding applications, with a temperature rating of 90°C and voltage rating of 600V. It is suitable for applications up to 35KV when installed according to cable manufacturer instructions. The L350N is ideal for use in power distribution, industrial machinery, and renewable energy systems where high ampacity and durability are critical. Key dimensions include a barrel I.D. of 0.700", barrel O.D. of 0.870", length of 5.390", width of 1.280", and tang length of 2.990". The mounting hole spacing is 1.750" with a hole diameter of 0.510".
  • High-conductivity copper construction with tin plating for corrosion resistance
  • Designed for 350 MCM copper conductors with 1/2" bolt size
  • Two-hole design for enhanced stability and load distribution
  • UL486A listed as wire connector and UL467 listed for grounding/bonding
  • Temperature rating: 90°C, Voltage rating: 600V, Max application: 35KV

Specifications

Application
Terminate, Splice, Tap Power Connectors
Cable Size
350 MCM (STR)
Color
Red
Connection Type
Compression
Current Rating
350 A
Environmental Conditions
90 C
Finish
Tin Plated
Material
Copper
Mounting
1/2 Mounting Holes
Number Of Holes
2
Poles
2
Series
L350N
Size
350 MCM
Size
L=5.39 - W=1.28 - OD=.870 - ID=.700
Special Features
350 MCM (STR) - 1/2 Mounting Holes - 1 3/4 Hole Spacing
Standard
UL486A/B
Stud Size
1/2 IN
Type
Long Barrel - Two Hole
Voltage Rating
600 V
Voltage Rating
35 kV
Warranty
1 Year
Package Dimensions (L x W x H)
5.39 IN x 1.28 IN x 0.87 IN
Package Dimensions (L x W x H)
13.6906 cm x 3.2512 cm x 22.098 mm
Package Weight (Imperial)
4.800 L
Package Weight (Metric)
2.177 kg
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Frequently Asked Questions

What is the standard packaging quantity for the L350N?

The L350N is packaged with a standard quantity of 12 units per carton.

What conductor sizes are compatible with the L350N?

The L350N is designed for 350 MCM copper conductors, with an expanded range of 350 MCM to 3/0 AWG when installed with the NSI N12ID dieless compression tool.

What is the temperature rating of the L350N?

The L350N has a temperature rating of 90°C, ensuring reliable performance in high-temperature environments.

What is the maximum voltage rating for the L350N?

The L350N is rated for 600V and is listed for applications up to 35KV when properly installed according to cable manufacturer instructions.

What tools are required to install the L350N?

The L350N requires a compression tool such as the NSI N12ID dieless compression tool for proper installation and termination.

How to Install the L350N Compression Connectors

This guide provides step-by-step instructions for installing L350N compression connectors, ensuring secure and reliable electrical connections.

Estimated time: 30m

Tools needed:

Wire strippers, Crimping tool, Multimeter

Supplies needed:

Copper compression connectors, Wire brush, Insulation tape

  1. Prepare the conductor

    Carefully strip the insulation from the conductor to a length that allows it to be fully inserted into the connector barrel without nicking the strands.

  2. Clean the conductor

    Use a wire brush to clean the stripped portion of the conductor, removing any oxide films to ensure a good electrical connection.

  3. Insert the conductor into the connector

    Insert the cleaned and stripped conductor completely into the connector barrel, ensuring it fills the barrel completely.

  4. Crimp the connector

    Use the appropriate crimping tool to crimp the connector securely onto the conductor, following the manufacturer's suggested crimp locations.

  5. Verify the connection

    Use a multimeter to check the continuity of the connection, ensuring that there are no breaks or faults in the electrical path.

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