Awg 电线 gauge chart & standards

American 电线 gauge 标准 sizes, diameters, resistances 与 ampacities.

awgwiregauge

Overview

The American Wire Gauge (AWG) system is the standard for measuring wire sizes in North America. Smaller AWG numbers indicate larger wire diameters.

Key relationships:

Every 6 gauge decrease doubles the wire diameter
Every 3 gauge decrease doubles the cross-sectional area
AWG 0000 (4/0) is the largest standard gauge (11.684 mm diameter)

AWG Wire Table

17 行

AWG wire sizes — copper conductor at 20°C
AWG	Diameter(mm)	Area(mm²)	Resistance(Ω/km)	Ampacity (60°C)(A)
0	8.251	53.49	0.3224	150
1	7.348	42.41	0.4066	130
2	6.544	33.63	0.5127	115
4	5.189	21.15	0.8152	85
6	4.115	13.3	1.296	65
8	3.264	8.366	2.061	50
10	2.588	5.261	3.277	35
12	2.053	3.309	5.211	25
14	1.628	2.081	8.286	20
16	1.291	1.309	13.17	0
18	1.024	0.823	20.95	0
20	0.812	0.518	33.31	0
22	0.644	0.326	52.96	0
24	0.511	0.205	84.22	0
26	0.405	0.129	133.9	0
28	0.321	0.081	212.9	0
30	0.255	0.0509	338.6	0

来源: engineeringtoolbox.com / NEC

AWG Formulas

Wire diameter for a given AWG number $n$ :

$d_n = 0.127 \times 92^{\frac{36-n}{39}} \text{ mm}$

Cross-sectional area:

$A_n = \frac{\pi}{4} d_n^2$

Common Applications

AWG Range	Typical Use
0000–0	Service entrance, feeders
1–4	Large appliances, sub-panels
6–10	Ranges, dryers, A/C units
12–14	General household circuits
16–18	Extension cords, fixtures
20–26	Electronics, low-voltage
28–40	Signal wire, coils

Note: Ampacity values vary significantly based on insulation type, ambient temperature, conduit fill, and installation method. Always refer to NEC tables for actual design.

来源: engineeringtoolbox.com