Wire Sizes And Maximum Length Determination Chart Page 8
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11Wire Sizes and Maximum Length Determination
(7/5/2007)
For copper wire, the nearest
VDI=31.
VDI = (20x100)/(3x24) = 27.78
This indicates #2 AWG wire or
35mm2
NOTES: AWG=Amercan Wire Gauge. Ampacity is based on the National
Electrical Code (USA) for 30 degrees C (85 degrees F) ambient air
temperature, for no more than three insulated conductors in raceway in
freee air of cable types AC, NM, NMC and SE; and conductor insulation
types TA, TBS, SA, AVB, SIS, RHH, THHN and XHHW. For other conditions,
refer to National Electric Code or an engineering handbook.
for-Your-System/a62/
The above formula results in:
Maximum feet for one wire running at Amp Capacity (ampacity)
12V-
12V-
48V-
48V-
120V-
120V-
AWG
Ampacity
3%
10%
3%
10%
3%
10%
16
10
4
12
14
48
36
120
14
15
5
16
19
64
48
160
12
20
5
18
22
72
54
180
10
30
6
20
24
80
60
200
8
55
5
17
21
70
52
175
6
75
6
19
23
77
58
192
4
95
8
25
30
101
76
253
2
130
9
29
34
114
86
286
O
170
10
35
42
138
104
346
OO
195
11
38
46
153
114
382
OOO
225
12
42
50
166
125
416
OOOO
260
14
46
55
183
137
457
Power Streams Table
Maximum
Maximum
amps for
amps for
AWG
Diameter
Diameter
Ohms per
Ohms
chassis
power
gauge
Inches
mm
1000 ft
per km
wiring
transmission
OOOO
0.4600
11.6840
0.0490
0.16072
380
302
OOO
0.4096
10.4038
0.0618
0.20270
328
239
OO
0.3648
9.2659
0.0779
0.25551
283
190
0
0.3249
8.2525
0.0983
0.32242
245
150
1
0.2893
7.3482
0.1239
0.40639
211
119
2
0.2576
6.5430
0.1563
0.51266
181
94
3
0.2294
5.8268
0.1970
0.64616
158
75
Page 8 of 11
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