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6.5 in (17.1 cm) wide
ELECTRICAL SYSTEMS
Amperage Tables
I am only going to very briefly cover the basics here. There is much, much more! Contact ABYC and the Coast Guard to get the latest standards for Electrical systems.
The following are not verbatim from the regulations. It is my own wording. Get a copy and read the regulation!
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) |
200C(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 | ||||||
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