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Table F: Allowable Amperage of Conductors of 50 Volts or More
The current values shown in
Table F and also on Table D do
not consider voltage drop for
conductors under 50 volts. The
values shown on the ampacity
table are the maximum safe
amperages which the
conductor can carry on a
continuous basis. They do not
apply to intermittent starting
loads such as motor start
currents. Since all Ancor™
Boat Cable is 105°C insulated,
only that temperature rating is
shown.
Due to the higher ambient
temperatures in engine spaces
and the heat retention of large
wire bundles, a “correction
factor” must be used to de
rate the wire by increasing
conductor size. Table F takes
into consideration these
factors and should be used
to select conductor sizes for
circuits over 50 volts. Note
that for electrical systems
under 50 volts, voltage drop
is the controlling factor and
the tables on 209 and 210
should be used.
Number of current
carrying conductors:
Correction
Factor
3
0.70
4 to 6
0.60
7 to 24
0.50
25 and above
0.40
Table F is supplied to eliminate
the need for calculating the
corrections for multi-conductor
cable bundles to Table E. The
values are already corrected.
Note: These tables only apply for 221°F (105°C) wire and other premium wire and should not be used
for lesser grades of wire and cable.
Reprinted at the courtesy of the United States Coast Guard Electrical System Compliance Guideline.
* There is NO LIMIT on conductors in a bundle under 50 volts.
Conductor
Size
2 Conductors
221°F (105°C)
Engine Space
3 Conductors
221°F (105°C)
Engine Space
4–6 Conductors
221°F (105°C)
Engine Space
7–24 Conductors
221°F (105°C)
Engine Space
AWG Outside Inside Outside Inside Outside Inside Outside Inside
18
20
17.0
14.0
11.9
12.0
10.2
10.0
8.5
16
25
21.3
17.5
14.9
15.0
12.8
12.5
10.6
14
35
29.8
24.5
20.8
21.0
17.9
17.5
14.9
12
45
38.3
31.5
26.8
27.0
23.0
22.5
19.1
10
60
51.0
42.0
35.7
36.0
30.6
30.0
25.5
8
80
68.0
56.0
47.6
48.0
40.8
40.0
34.0
6
120
102.0 84.0
71.4
72.0
61.2
60.0
51.0
4
160
136.0 112.0 95.2
96.0
81.6
80.0
68.0
3
180
153.0 126.0 107.1 108.0 91.8
90.0
76.5
2
210
178.5 147.0 125.0 126.0 107.1 105.0 89.3
1
245
208.3 171.5 145.8 147.0 125.0 122.5 104.1
1/0
285
242.3 199.5 169.6 171.0 145.4 142.5 121.1
2/0
330
280.5 231.0 196.4 198.0 168.3 165.0 140.3
3/0
385
327.3 269.5 229.1 231.0 196.4 192.5 163.6
4/0
445
378.3 311.5 264.8 267.0 227.0 222.5 189.1
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Technical Data