CEC Part I · Table 2 (Copper Conductors, 60°C)

Wire Gauge & Ampacity Calculator

Match conductor size to breaker rating — copper NMD90, CEC Table 2, no derating applied.

1. Circuit Details

Breaker Size

2. Minimum Wire Size

CEC Table 2, 60°C

MINIMUM COPPER NMD90

— AWG

CONDUCTOR AMPACITY

— A

Check the run length too: long runs at high current can need a heavier gauge than ampacity alone suggests. Use our Voltage Drop Calculator to check.

No derating applied. Bundling multiple cables together, running through high ambient temperatures (like an attic), or long parallel runs can all require a heavier gauge than this baseline table shows. Confirm with a licensed electrician for anything beyond a simple single-cable run.

Full reference table

AWG	Ampacity (60°C)	Common Use