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Electrical Systems

Electrical regulations and standards that apply to boat builders and recreational boats.

ELECTRICAL TABLE:
33 CFR 183.425https://newboatbuilders.com/pages/33CFR_electrical.html
ALLOWABLE AMPERAGE OF CONDUCTORS FOR UNDER 50 VOLTS

The following table is used to calculate the appropriate wire size based on the temperature of the insulation of the wire.

Note: This is the table that is in the Federal Regulations.  ABYC Standard E-11 has five separate tables based on how many conductors are in a wire bundle.

 

Table 1 - ALLOWABLE AMPERAGE OF CONDUCTORS FOR SYSTEMS UNDER 50 VOLTS
Temperature Rating of Conductor Insulation
Conductor Size English (metric) 60 C (149 F) 75 C (167 F) 80 C (176 F) 90 C (194 F) 105 C (221 F) 125 C (257 F) 200 C (392 F)
Outside Engine space Inside Engine Space Outside Engine space Inside Engine Space Outside Engine space Inside Engine Space Outside Engine space Inside Engine Space Outside Engine space Inside Engine Space Outside Engine space Inside Engine Space Outside or Inside Engine Space
18 (0.8) 10 5.8 10 7.5 15 11.7 20 16.4 20 17.0 25 22.3 25
16 (1) 15 8.7 15 11.3 20 15.6 25 20.5 25 21.3 30 25.7 35
14 (2) 20 11.6 20 15.0 25 19.5 30 24.6 35 29.8 40 35.6 45
12 (3) 25 14.5 25 18.8 35 27.3 40 32.8 45 38.3 50 44.5 55
10 (5) 40 23.2 40 30.0 50 39.0 55 45.1 60 51.0 70 62.3 70
8 (8) 55 31.9 65 48.8 70 54.6 70 57.4 80 68.0 90 80.1 100
6 (13) 80 46.4 95 71.3 100 78.0 100 82.0 120 102 125 111 135
4 (19) 105 60.9 125 93.8 130 101 135 110 160 136 170 151 180
2 (32) 140 81.2 170 127 175 138 180 147 210 178 225 200 240
1 (40) 165 95.7 195 146 210 163 210 172 245 208 265 235 280
0 (50) 195 113 230 172 245 191 245 200 285 242 305 271 325
00 (62) 225 130 265 198 285 222 285 233 330 280 355 316 370
000 (81) 260 150 310 232 330 257 330 270 385 327 410 384 430
0000 (103) 300 174 380 270 385 300 385 315 445 378 475 422 510

Notes for the above table

Temperature Rating of Conductor Insulation
 

60oC (140oF)

75oC (167oF)

 80oC (176oF)

90oC (194oF)

105oC(221oF)

 125oC (257oF) 200oC (392oF)
1. See the following table: Temperature Rating of conductor 0.58 0.75 0.78 0.82 0.85 0.89 1.00
2. See the following Table: 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
               

Pg 1, 2, Amperage Table on Pg 3,  Wire Size Pg 4

  
American Boat And Yacht Council  Boat Design Net  Wooden Boat Foundation
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