ELECTRICAL SYSTEMS Amperage Tables
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 |
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|
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) |
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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 |
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|
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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