Wire Ampacity Calculator

CEC Table 2 Interactive Lookup with Temperature & Bundling Corrections

Wire Selection

Wire Size (AWG / kcmil)

Insulation Type

Base Ampacity

20A

Final Ampacity

20A

Wire Gauge Comparison

2.08mm

2.05mm

2.59mm

3.26mm

4.11mm

5.19mm

Correction Factors

Ambient Temperature (°C)

Temperature Correction Factor

Ref Temp: 30°C

Factor: 1.00

Number of Bundled Conductors

Bundling Correction Factor

Conductors: 3

Factor: 0.85

Final Ampacity = Base × Temp Factor × Bundle Factor

CEC Table 2: Wire Ampacity Reference

Size (AWG/kcmil)	60°C TW Cu	75°C RW90 Cu	90°C RW90 Cu	60°C TW Al	75°C RW90 Al
14	15	15	20	15	15
12	20	20	25	15	20
10	30	30	40	25	30
8	40	50	55	30	40
6	55	65	75	40	50
4	70	85	95	55	65
2	95	115	130	75	90
1/0	125	150	170	100	120
2/0	145	175	195	115	135
3/0	165	200	225	130	155

Common Sizing Scenarios

Scenario 1: 40A Circuit at 75°C

Size wire for a 40A load with 75°C insulation. Ambient temp is 30°C, single conductor.

Scenario 2: Hot Environment Bundle

5 conductors bundled in 40°C ambient. Wire size 6 AWG, 75°C insulation. Find derated ampacity.

Scenario 3: Cold Weather Advantage

10 AWG wire at 10°C ambient temp, 3 bundled conductors, 90°C insulation. What's the derated ampacity?

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Size (AWG/kcmil)	60°C TW Cu	75°C RW90 Cu	90°C RW90 Cu	60°C TW Al	75°C RW90 Al
14	15	15	20	15	15
12	20	20	25	15	20
10	30	30	40	25	30
8	40	50	55	30	40
6	55	65	75	40	50
4	70	85	95	55	65
2	95	115	130	75	90
1/0	125	150	170	100	120
2/0	145	175	195	115	135
3/0	165	200	225	130	155

Size (AWG/kcmil)	60°C TW Cu	75°C RW90 Cu	90°C RW90 Cu	60°C TW Al	75°C RW90 Al
14	15	15	20	15	15
12	20	20	25	15	20
10	30	30	40	25	30
8	40	50	55	30	40
6	55	65	75	40	50
4	70	85	95	55	65
2	95	115	130	75	90
1/0	125	150	170	100	120
2/0	145	175	195	115	135
3/0	165	200	225	130	155