Conductor Sizing Study Guide

Conductor sizing is a sequence of checks rather than one table lookup: determine the load, establish the ampacity basis, apply installation conditions, respect equipment limitations, coordinate protection, and check voltage drop separately.

CEC conductor study commonly begins in Section 4 and then branches into the section governing the specific equipment or load.

• Start with required load current before choosing a conductor table value.
• Consider conductor material, temperature, installation method, and current-carrying conductor count.
• Respect equipment and termination temperature limitations.
• Keep voltage drop separate from the ampacity check.
• Verify overcurrent protection and any circuit-specific Code rules independently.