RBE Electronics

WIRE GAUGE TABLES

American Wire Gauge (AWG) sizes may be determined by measuring the diameter of the conductor (the bare wire) with the insulation removed. Refer to the Wire gauge Diameter Table for dimensions. When choosing wire gauge, the distance the wire must run and the amperage it will be expected to carry must be determined first. Refer to the Wire gauge Selection Table. Note that you can always use thicker wire (lower gauge number) than is recommended.

METRIC-TO-AWG CONVERSION TABLE

Metric Size

mm2

AWG Size

0.5

20

0.8

18

1.0

16

2.0

14

3.0

12

5.0

10

8.0

8

13.0

6

19.0

4

32.0

2

52.0

0

 

WIRE GAUGE DIAMETER TABLE

American Wire gauge

Wire Diameter in inches

20

0.03196118

18

0.040303

16

0.0508214

14

0.064084

12

0.08080810

10

0.10189

8

0.128496

6

0.16202

5

0.18194

4

0.20431

3

0.22942

2

0.25763

1

0.2893

0

0.32486

00

0.3648

 

WIRE GAUGE SELECTION TABLE

Circuit Amperes

Circuit Watts

Wire gauge (for length in feet)

6V

12V

6V

12V

3'

5'

7'

10'

15'

20'

25'

0 to 2.5

0 to 5

15

30

18

18

18

18

18

18

18

3.0

6

18

36

18

18

18

18

18

18

16

3.5

7

21

42

18

18

18

18

18

18

16

4.0

8

24

48

18

18

18

18

18

16

16

5.0

10

30

60

18

18

18

18

16

16

16

5.5

11

33

66

18

18

18

18

16

16

14

6.0

12

36

72

18

18

18

18

16

16

14

7.5

15

45

90

18

18

18

18

14

14

12

9.0

18

54

108

18

18

16

16

14

14

12

10

20

60

120

18

18

16

16

14

12

10

11

22

66

132

18

18

16

16

12

12

10

12

24

72

144

18

18

16

16

12

12

10

15

30

90

180

18

16

16

14

10

10

10

20

40

120

240

18

16

14

12

10

10

8

25

50

150

300

16

14

12

12

10

10

8

50

100

300

600

12

12

10

10

6

6

4

75

150

450

900

10

10

8

8

4

4

2

100

200

600

1200

10

8

8

6

4

4

2

Find the amperes or watts the circuit is expected to carry on the left and the distance the wiring must run at the top - follow the columns until they intersect - for example, a 12 volt circuit which is 15 feet long and carries 10 amperes should use at least 16 gauge wire.

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