Cable lug selection method
The lug must match conductor size and material, conductor strand class, terminal metal, stud pattern, environment, and the approved termination system.
Amm² = 0.012668 × 92^((36-AWG)/19.5)Cable marking = approved lug barrel rangeAl conductor + Cu terminal → rated Al-Cu transition connectorwhere:
- Amm²
- Approximate conductor cross-sectional area[mm²]
- AWG
- American Wire Gauge number
- Al-Cu
- Connector explicitly rated for aluminum-to-copper transition
Approximate area conversion does not make metric and AWG lugs interchangeable. The cable marking and manufacturer barrel/die chart control the final selection.
How to select a cable lug
Start with the conductor marking and strand class, not outside diameter. Match the approved barrel, conductor and terminal metals, stud hole, palm pattern, environment, and compression or mechanical termination system.
- Confirm mm², AWG, or kcmil marking.
- Identify copper or aluminum conductor.
- Identify equipment terminal metal.
- Match stud and palm pattern.
- Select finish and approved tool or torque method.
AWG and metric sizes
AWG-to-mm² conversion is useful for comparison but does not make product series interchangeable. For example, 1/0 AWG is about 53.5 mm² and is only a near reference for 50 mm² cable.
1/0 AWG ≈ 53.5 mm²
350 kcmil ≈ 177 mm²
Copper, tinned, and bimetallic lugs
Bare copper can suit dry indoor copper-to-copper connections. Tinned copper is a common corrosion-resistant starting point for humid, outdoor, marine, and battery environments. Aluminum conductor connected to copper equipment normally needs an explicitly rated Al-Cu transition connector.
Crimp and palm verification
Compression lugs require the approved die, tool, crimp count, and inspection marks. Mechanical and shear-bolt lugs require conductor-material approval and installation torque. Two-hole palms require exact terminal-pad spacing and orientation.
Assumptions
- Conductor size is taken from cable marking, not measured cable diameter
- AWG-to-mm² values are conversion references only
- The exact barrel and die come from the lug manufacturer
Important Warnings
- Do not install a standard copper lug directly on aluminum conductor unless it is explicitly rated for that use.
- A lug, conductor strand class, die, tool, crimp count, palm, bolt, torque, and terminal pad must be approved as one connection system.