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Wire &Wire Management
The Law
The Code of Federal Regulations (CFR) 183.425 Conductors
(b)
Except for intermittent surges each conductor must not carry
a current greater than that specified in Table E for the
conductor’s gauge and temperature rating.
(c)
For conductors in engine spaces, amperages must be
corrected by the appropriate correction factor in note 1 of
Table E.
Due to engine heat, the ambient temperature in engine spaces is
usually higher than in other spaces of the boat. Wiring in and
passing through engine spaces must be able to operate at these
higher ambient temperatures. The ampacity values in Table E are
based on an ambient temperature of 86°F (30°C) which is
considered reasonable for use on boats except in engine spaces.
The correction factors in Note 1 in Table E convert the ampacities
to Table E to acceptable values in an ambient temperature of
122°F (50°C). This higher temperature has been selected as
satisfactory for engine spaces. Note 1 is supplied to eliminate the
need for calculating the corrections to Table E. The values are
already corrected.
Table E: Temperature Rating of Conductor Insulation
*De-rating for engine space is 0.85 for 221°F (105°C)
rated wire.
Table D: Conductor Sizes
AWG
SAE
Ampacity Engine Space
AWG mm
2
CM area
CM area
Outside Inside
18
0.8
1,600
1,537
20
17
16
1
2,600
2,336
25
21
14
2
4,100
3,702
35
30
12
3
6,500
5,833
45
38
10
5
10,500
9,343
60
51
8
8
16,800
14,810
80
68
6
13
26,600
24,538
120
102
4
21
42,000
37,360
160
136
2
34
66,500
62,450
210
178
1
42
83,690
77,790
245
208
1/0
53
105,600
98,980
285
242
2/0
68
133,100
125,100
330
280
3/0
85
167,800
158,600
385
327
4/0
107
211,600
205,500
445
378
Conductor
Size AWG
Ampacity
Outside of
Engine Space
Ampacity Inside
of Engine Space
(Note 1)
18
20
17
16
25
21
14
35
30
12
45
38
10
60
51
8
80
68
6
120
102
4
160
136
3
180
153
2
210
178
1
245
208
1/0
285
242
2/0
330
280
3/0
385
327
4/0
445
378
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