Authorized NSI Industries Distributor
NSI Industries L356 - 1 Hole Long Barrel Copper Compression Lug 3 AWG - 5/16" Bolt Long Barrel Copper Compression Lugs are produced from high conductivity copper tubing. They are tin-plated to provide corrosion low contact resistance. Marked with die index and color coded for easy reference. Listed for 35KV maximum when properly installed and to cable manufacturer instructions. Temperature rating 90 degrees C. .

NSI Industries L356 1 Hole Long Barrel Copper Compression Lug 3 AWG - 5/16" Bolt Long Barrel Copper…

UPC: 662381034229

Documents & Media
Technical Bulletin

Contact for Pricing

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

Overview

The NSI Industries L356 is a one-hole long barrel copper compression lug engineered for medium-voltage electrical terminations. Manufactured from high-conductivity copper tubing and tin-plated for corrosion resistance, this lug ensures low contact resistance and long-term reliability in demanding applications. The L356 is specifically designed for 3 AWG conductors with a 5/16" bolt size, providing secure mechanical and electrical connections. Its extended barrel design increases conductor surface contact, enhancing conductivity and pull-out strength for critical power distribution systems. The lug features a die index marking and white color coding for easy identification and inventory management. With a maximum voltage rating of 35kV (when installed per cable manufacturer instructions) and a temperature rating of 90°C, the L356 is suitable for substations, switchgear, and other medium-voltage infrastructure. The barrel dimensions are 0.270" ID and 0.377" OD, with an overall length of 2.157" and width of 0.538". For applications exceeding 2000V, consult the cable manufacturer for voltage stress relief instructions. The L356 is part of NSI Industries' L Series of long barrel copper lugs, optimized for high-reliability terminations in industrial and utility environments.
  • One-hole long barrel design for 3 AWG conductors
  • 5/16" bolt size for secure mounting
  • 35kV maximum voltage rating (proper installation required)
  • Tin-plated copper for corrosion resistance and low contact resistance
  • 90°C temperature rating with 0.270" ID and 0.377" OD barrel dimensions

Specifications

Application
Terminate, Splice, Tap Power Connectors
Cable Size
# 3 AWG (STR)
Color
White
Connection Type
Compression
Environmental Conditions
90 C
Finish
Tin Plated
Material
Copper
Mounting
5/16 Mounting Hole
Mounting Type
1 Hole
Number Of Holes
1
Series
L356
Size
L=2.15 - W=.550 - OD=.380 - ID=.270
Size
3 AWG
Special Features
# 3 AWG (STR) - 5/16 Mounting Hole
Standard
UL486A/B, UL467 (8 AWG -3/0 AWG)
Stud Size
5/16 IN
Type
Long Barrel - One Hole
Voltage Rating
600 V
Warranty
1 Year
Package Dimensions (L x W x H)
2.157 IN x 0.538 IN x 0.377 IN
Package Dimensions (L x W x H)
5.4788 cm x 13.6652 mm x 9.5758 mm
Package Weight (Imperial)
2.000 L
Package Weight (Metric)
0.907 kg
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