(→Calculating Wire Sizes: used bullets (*) for formatting and removed the tabs. Please don't use tabs to try to force formatting.) |
(→Calculating Wire Sizes: nice work on this page. And wow that took a bit for me to figure out on the table. Apparently the equal sign was breaking it! Thanks for your patience and perseverance.) |
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|File:2 wireloss.png|Caption |2 |Algebraically rearrange Eqn. 1 to solve for n. The resulting equation is Eqn. 2 to the left. | |File:2 wireloss.png|Caption |2 |Algebraically rearrange Eqn. 1 to solve for n. The resulting equation is Eqn. 2 to the left. | ||
|File:6 wireloss.png|Caption |3 |If n<0, replace n with 1-m in Eqn. 1 [https://en.wikipedia.org/wiki/Circular_mil] . | |File:6 wireloss.png|Caption |3 |If n<0, replace n with 1-m in Eqn. 1 [https://en.wikipedia.org/wiki/Circular_mil] . | ||
|File:5 wireloss.png|Caption |4 |Substituting n | |File:5 wireloss.png|Caption |4 |Substituting n equals 1-m into Eqn. 1 yields this equation (Eqn. 3). Use Eqn. 3 if n<0. | ||
|File:3 wireloss.png|Caption |5 |Solve Eqn. 3 for m, the resulting equation (Eqn. 4) is to the left. | |File:3 wireloss.png|Caption |5 |Solve Eqn. 3 for m, the resulting equation (Eqn. 4) is to the left. | ||
|File:4 wireloss.png|Caption |6 |Eqn. 3 is also a rearrangement of Eqn. 1. Use Eqn. 4 to solve for A<sub>n</sub> | |File:4 wireloss.png|Caption |6 |Eqn. 3 is also a rearrangement of Eqn. 1. Use Eqn. 4 to solve for A<sub>n</sub> |
Revision as of 01:50, 19 January 2020
Introduction
Describe wire length, voltage loss, etc. here.
Tables
The following table shows the American Wire Gauge (AWG) size for several different round trip (RT) wire lengths based on maximum current (A) for a 12V DC system (assuming 3% maximum wire loss):
RT length | 5A | 10A | 15A | 20A | 25A | 30A | 40A | 50A |
---|---|---|---|---|---|---|---|---|
15 ft | 16 | 12 | 10 | 10 | 8 | 8 | 6 | 6 |
20 ft | 14 | 12 | 10 | 8 | 8 | 6 | 6 | 4 |
25 ft | 14 | 10 | 8 | 8 | 6 | 6 | 4 | 4 |
30 ft | 12 | 10 | 8 | 6 | 6 | 4 | 4 | 2 |
40 ft | 12 | 8 | 6 | 6 | 4 | 4 | 2 | 2 |
50 ft | 10 | 8 | 6 | 4 | 4 | 2 | 2 | 1 |
60 ft | 10 | 6 | 4 | 4 | 2 | 2 | 1 | 1/0 |
70 ft | 8 | 6 | 4 | 2 | 2 | 2 | 1/0 | 2/0 |
80 ft | 8 | 6 | 4 | 2 | 2 | 1 | 1/0 | 2/0 |
90 ft | 8 | 4 | 2 | 2 | 1 | 1/0 | 2/0 | 3/0 |
This table was adapted from Engineering Toolbox [1] .
Calculating Wire Sizes
Assumptions made:
- copper wire resistivity = 11.2 [2]
- 3% loss from wires
- allowable voltage drop = 0.36V
- 12V system, 3% (0.03) wire loss -> 12V x 0.03 = 0.36V
Variable Declarations:
- An: circular mil area
- n: AWG
- m: AWG
- Conductor resistivity: constant, 11.2
- Current: current through wire in Amps, acquired from table
- Roundtrip (RT) wire length: complete length of wire, ft, acquired from table
- Allowable voltage drop: voltage drop through wires, V
File:1 wireloss.png
Table 2. Calculating Wire Sizes
See Help:Tables.
Use help:references to see how to use the reference format.[1]
Use Help:Images on how to upload the graph image(s). Please remember to use a very descriptive name for the file.
References
- ↑ It is quite easy and just relies on ref and /ref in between less than and greater than symbols.