Wire Gauge and Measurement

Wire Size Guidelines
For Model Railway Layout wiring


	Feeders
	1-5 ft (0-1.5m)			> 5 ft (> 1.5m)
	AWG	mm	sq mm	AWG	mm	sq mm

G, O, S, No.1	16	1.29	1.31	14	1.63	2.08

HO	18 - 22	1.02 - 0.65	0.82 - 0.33	18 - 20	1.02 - .081	0.82 - 0.52

TT	20	0.81	0.52	20	0.81	0.52

N,Z	18 - 22	1.02 - 0.65	0.82 - 0.33	18 - 20	1.02 - .081	0.82 - 0.52

N-Track	18 - 22	1.02 - 0.65	0.82 - 0.33	18 - 20	1.02 - .081	0.82 - 0.52


	BUS Wire
	1-20 ft (1 - 6.1m)			21 - 40 ft (6.2 - 12.2m)			>41 ft (>12.3m)
Scale	AWG	mm	sq mm	AWG	mm	sq mm	AWG	mm	sq mm

G, O, S, No.1	12	2.05	3.3	10	2.6	5.26	8	3.26	8.36

HO	14	1.63	2.08	12 - 14	2.05 - 1.63	3.3 - 2.05	12 - 14	2.05 - 1.63	3.3 - 2.05

TT	14	1.63	2.08	14	1.63	2.08	14	1.63	2.08

N,Z	16	1.29	1.31	14	1.63	2.08	12	2.05	3.3

N-Track	12	2.05	3.3	12	2.05	3.3	12	2.05	3.3

Metric to AWG Conversion Table

Metric size (mm2 cross-sectional area)	AWG Wire Gauge Size	Maximum Rating (Amp) (approximate at temperature 90 Deg C) *

0.0080	40	0.55
0.0080	38	0.68
0.0100	37
0.0127	36	0.91
0.0160	35
0.0201	34	1.20
0.0300	32	1.90
0.0500	30	2.20
0.0800	28	3.00
0.1400	26	4.00
0.2500	24	5.50
0.3400	22	10.00
0.3800	21
0.5000	20	13.00
0.7500	19
1.00	18	18.00
1.50	16	24.00
2.50	14	35.00
4.00	12	40.00
6.00	10	55.00
10.00	8	80.00
16.00	6	105.00
25.00	4	140.00
26.67	3	165.00
35.00	2	190.00
50.00	1	220.00

		* Cooner Wire Chart

NAVIGATION