AWG 22 carrying 20 A — 21.13 V over 10 m
0.326 mm² of copper, 0.05284 Ω per metre. Carrying 20 A, a ten-metre run there and back loses 21.13 V.
You need thicker wire · Current it handles 4.4A
- Diameter
- 0.644 mm
- Cross-section
- 0.326 mm²
- Resistance per metre
- 0.05284 Ω
- Current it handles
- 4.4 A
- Drop over 10 m
- 21.13 V
- Heat per metre
- 21.13 W
Length within 3%
Lose the same 0.36 V and it is 3% of a 12 V system but 0.16% of a 230 V one. That is why car wiring looks so thick, and why a long 12 V light run dims at the far end. This page works out the length that stays under 3% for each voltage separately.
- car 12 V0.2 m
- truck 24 V0.3 m
- North America 120 V1.7 m
- Europe 230 V3.3 m
The match in the other family
The United States names wire by AWG number; most of the world names it by cross-section in mm². The two never line up exactly, so each page shows the nearest match by area. When substituting, err toward the thicker one.
0.75mm²0.75mm²Nearby cells
Same gauge, other currents
Same current, other gauges
How to read this
- The length is the distance from source to device. The return trip is already counted.
- Figures are for copper. Aluminium of the same size has about 1.6 times the resistance.
- The "current it handles" is a cautious estimate. Real installations follow the local code table.
- A wire running hot and a lamp dimming at the far end are two different problems. Pick a gauge that answers both.
Frequently asked questions
Q. Can AWG 22 carry 20 A?
No. This gauge tops out around 4.4 A, so step up to something thicker.
Q. How far can I run it?
The drop stays under 3% for 3.3 m at 230 V, 1.7 m at 120 V, or 0.2 m at 12 V.
Q. How many mm² is AWG 22?
0.326 mm², from a diameter of 0.644 mm. The nearest size in the other family is 0.75mm².
Q. How hot does the wire get?
Every metre turns 21.13 W into heat. Over ten metres that is a 211.3 W heater left running.