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Installation - 3
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Table 3-2. Stranded Copper Wire Ampere Capacity
Wire Size Ampacity Notes:
AWG Cross Section
Area in mm
2
22 5.0
20 8.33
0.75 10
18 15.4
1 13.5
16 19.4
1.5 16
14 31.2
2.5 25
12 40
432
10 55
640
875
10 63
6 100
4 135
1. Ratings for AWG-sized wires derived from MIL-W-
5088B. Ratings for metric-sized wires derived from
IEC Publication 335-1.
2. Ampacity of aluminum wire is approximately84% of
that listed for copper wire.
3. When two or more wires are bundled together, ampacity
for each wire must be reduced to the following
percentages:
2 conductors 94%
3 conductors 89%
4 conductors 83%
5 conductors 76%
4. Maximum temperatures:
Ambient = 50° C
Conductor = 105° C
Table 3-3. Maximum Wire Lengths to Limit Voltage Drops
Wire Size Resistivity Maximum Length in Meters (Feet) to Limit
Voltage Drop to 0.5 V or Less
Cross
Section
AWG Area in
mm2
Ω
ΩΩ
Ω/kft Ω
ΩΩ
Ω/km
5 A 10 A 20 A 30 A 40 A 50 A 60 A
22 16.15 (6) (3) (1.5) (1) (0.77) (0.62) (0.52)
0.5 40.1 2.5 1.2 0.6 0.4 0.31 0.25 0.21
20 10.16 (9.5) (4.5) (2) (1.5) (1.23) (0.98) (0.82)
0.75 26.7 3.7 1.9 0.9 0.6 0.47 0.37 0.31
18 6.388 (15.5) (7.5) (3.5) (2.5) (2.0) (1.57) (1.30)
1 20.0 5.0 2.5 1.3 0.8 0.63 0.50 0.42
16 4.018 (24.5) (12) (6) (4) (3.1) (2.49) (2.07)
1.5 13.7 7.3 3.6 1.8 1.2 0.91 0.73 0.61
14 2.526 (39.5) (19.5) (9.5) (6.5) (4.9) (3.46) (3.30)
2.5 8.21 12.2 6.1 3.0 2.0 1.52 1.22 1.01
12 1.589 (62.5) (31) (15.5) (10.5) (7.9) (6.29) (5.24)
4 5.09 19.6 9.8 4.9 3.3 2.46 1.96 1.64
10 0.9994 (100) (50) (25) (17) (12.5) (10.00) (8.34)
6 3.39 29 14.7 7.4 4.9 3.69 2.95 2.96
8 0.6285 (159) (79) (39.5) (27) (19.9) (15.91) (13.25)
10 1.95 51 25 12.8 8.5 6.41 5.13 4.27
6 0.3953 (252) (126) (63) (40) (31.6) (25.30) (21.07)
16 1.24 80 40 20 13.4 10.08 8.06 6.72
4 0.2486 (402) (201) (100) (68) (50.37) (40.23) (33.51)