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Technical article from www.Marinco.com
TECHNICAL INFORMATION
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 derate 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 pages 14 and 15 should be used.
| |
2 Conductors 105° C (221° F) |
3 Conductors 105° C (221° F) |
4 to 6 Conductors 105° C (221° F) |
7 to 24 Conductors 105° C (221° F) |
| Conductor |
Outside |
Inside |
Outside |
Inside |
Outside |
Inside |
Outside |
Inside |
| Size |
Engine |
Engine |
Engine |
Engine |
| (AWG) |
Space |
Space |
Space |
Space |
|
|
|
|
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 |
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 |
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.
| Number of current |
Correction |
| carrying conductors: |
Factor |
| 3 |
0.70 |
| 4 to 6 |
0.60 |
| 7 to 24 |
0.50 |
| 25 and above |
0.40 |
- Note: These tables only apply for 105° C (221° F) 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.
Chart for wires carrying amperage under 50 Volts
Original article from Ancor
Electrical Guides from Marinco Group Brands
Ancor Guide- Features and Benefits (pdf)
Marinco- A Boaters Guide to AC Electrical Systems (pdf)
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