NEC 2023 · CH.9 TBL.8
Home / Reference / Wire Size by Amperage

Wire Size by Amperage

The quick ampacity answer for every common circuit rating — each links to a full distance chart.

CircuitCopper (75°C)Aluminum (75°C)
15 A14 AWG12 AWG
20 A14 AWG12 AWG
25 A12 AWG10 AWG
30 A10 AWG10 AWG
40 A8 AWG8 AWG
50 A8 AWG6 AWG
60 A6 AWG4 AWG
70 A4 AWG3 AWG
80 A4 AWG2 AWG
100 A3 AWG1 AWG
125 A1 AWG2/0 AWG
150 A1/0 AWG3/0 AWG
200 A3/0 AWG250 kcmil
Built & maintained by Murugan Vellaichamy · Every calculation verified against NEC Chapter 9 Table 8 & Table 310.16 published values · Informational reference — not engineering advice