APPENDIX 65
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Allowable Amperage of Conductors of 50 Volts or More
The current values shown in this chart and also on the wire and cable specifications chart 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. This chart 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 62 and 63 should be used.
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
Conductor Size
AWG
Outside Inside Outside Inside Outside Inside Outside Inside
18 16 14 12 10
20 17.0 14.0 11.9 12.0 10.2 10.0
8.5
25 21.3 17.5 14.9 15.0 12.8 12.5 10.6 35 29.8 24.5 20.8 21.0 17.9 17.5 14.9 45 38.3 31.5 26.8 27.0 23.0 22.5 19.1 60 51.0 42.0 35.7 36.0 30.6 30.0 25.5 80 68.0 56.0 47.6 48.0 40.8 40.0 34.0 120 102.0 84.0 71.4 72.0 61.2 60.0 51.0 160 136.0 112.0 95.2 96.0 81.6 80.0 68.0 180 153.0 126.0 107.1 108.0 91.8 90.0 76.5 210 178.5 147.0 125.0 126.0 107.1 105.0 89.3 245 208.3 171.5 145.8 147.0 125.0 122.5 104.1 285 242.3 199.5 169.6 171.0 145.4 142.5 121.1 330 280.5 231.0 196.4 198.0 168.3 165.0 140.3 385 327.3 269.5 229.1 231.0 196.4 192.5 163.6 445 378.3 311.5 264.8 267.0 227.0 222.5 189.1
8 6 4 3 2 1
1/0 2/0 3/0 4/0
This table is supplied to eliminate the need for calculating the corrections for multi-conductor cable bundles in the temperature rating chart. The values are already corrected.
Number of current carrying conductors:
Correction Factor
3
0.70 0.60 0.50 0.40
4 to 6
7 to 24
25 and above
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.
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