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D.C. Wire Sizing Chari
Ul; wore ::Olzlng l;nan
Stranded Conductors For 12 Volt Circuits
10% Voltage Drop
A. ::oocleTY
UT
AUTOmOTIVe t::nglneers
I
ype wore
tI.
NaTIOnal t::leClTlCal l;ooe
I
ype wore
¥Vire Size
18
16
14
12
10
8
6
I
4
16
14
12
10
8
6
4
I
2
1
tanding 116X30
191<291
'
9><27 19><25 19><23 19><21
49><23 149><21
19
19
19
19
19
37
61
127
127
,
ircular
1537
1
2336 13702
66370
183690
Mill Area
5833
9343
14810
25910 37360
2583
4107
6530
10380 16510 262SO 41740
ircuit
Current
Maximum Length Of Conductor In Feet From Power Source To Load And Return
nAMPS
I
I
1.
i
174
260
285
2.
: 87
j
130
210
330
i
142
227
3.
i
58
I 86.7
140
220
94.6
151
240
4.
143.7
65
105
165
262
I
71
113
180
285
5.
34.7
52
84
132
210 .
57
57
143
232
6.
I
29
43.3
70
110
175
279
47.3
75.3
120
190
303
7.
i 24.7
37
60
94
ISO
240
40.7
64.7
103
j
163
260
8.
t 21.7
32.7
52.7
82.7
131
210
35.3
56.3
89.6
143
227
9.
i
19.3
28.7
46.7
73.3
116
186
300
31.7
SO.3
79.6
127
202
321
10.
i 17.3
26
42
66
105
j
168
271
28.3
45.3
72
114
182
289
15.
17.3
28
44
70
112
180
285
19
30
48
76
121
193
306
20.
21
33
52.7
83.7
135
211
22.7
36
57
91
145
230
30.
I
22
35
56
90.3
142
24
38
60.7
96.3
153
243
306
40.
j
26.3
42
67.3
107
28.3
45.3
72
115
182
230
SO.
I
21
33.7
54
85.3
23
36.3
57.7
92
148
184
55.
!
30.7
49
77.7
33
52.3
83.3
133
167
60.
I
45
71.3
48
76.3
121
153
75.
36
57
38.3
61
97.3
123
90.
I
1
47.3
51
81
102
The vottage drop for specific conductor lengths may be calculated by the formula:
I
=
load in amperes
Voltage drop
=
lQZ:ixl
X
L.
where:
L
=
conductor length in feet
CM
CM
=
conductor circular mil area
When a
circu~,
including the ground return, uses several different size conductors, the vottage
drop at the electrical device is the sum of the drops calculated for each size segment of the
circuit.
..
figure 4.4:
D.C. Wire S,ZlOg Chart
Westerbeke Generators
32
15KW
BTDA
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