Question 1

What is AWG?

Accepted Answer

AWG stands for American Wire Gauge. It is a logarithmic standard for wire diameters used primarily in North America. Lower AWG numbers mean thicker wire; AWG 0000 is the largest, AWG 40 is the smallest.

Question 2

How do I convert AWG to mm²?

Accepted Answer

Each AWG size maps to a specific cross-sectional area in circular mils. To convert to mm² multiply the CM value by 0.0005067. For example AWG 14 is 4107 CM ≈ 2.08 mm².

Question 3

What ampacity should I use for a 14 AWG copper wire?

Accepted Answer

Per NEC Table 310.16, 14 AWG copper THHN in a 75°C rated circuit is rated for 20 amps. 12 AWG copper is rated for 25 amps and 10 AWG copper for 35 amps at the 75°C column.

Question 4

How is the recommended AWG chosen?

Accepted Answer

We look up your target current against the NEC 75°C ampacity column for the selected conductor material and pick the smallest AWG whose rating equals or exceeds your current. Always verify with local code.