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techtalk:ref:elec01 [2017/06/18 02:27] ixl2relax [Wire Gauge & Current Loads] |
techtalk:ref:elec01 [2021/11/10 05:34] ixl2relax [Ohm's Law] |
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| ===== Wire Gauge & Current Loads ===== | ===== Wire Gauge & Current Loads ===== | ||
| - | There are many competing charts online indicating what current is allowed with various gauge wires. Maximum current ratings are to prevent the insulation on the wire from breaking down or melting due to overheating. When bundled together, the maximum rating must be reduced to account for the decrease in heat dissipation. I have listed below a conservative maximum current of the typical wire gauges, but even these maximum ratings must be reduced under various loading conditions. | + | There are many competing charts online indicating what current is allowed with various gauge wires. Maximum current ratings are to prevent the insulation on the wire from breaking down or melting due to overheating. When bundled together, the maximum rating must be reduced to account for the decrease in heat dissipation. Below is a conservative listing of the maximum current for typical wire gauges, but even these maximum ratings must be reduced under various loading conditions. |
| Fusing of circuits is also a concern. This quotation makes the point:\\ | Fusing of circuits is also a concern. This quotation makes the point:\\ | ||
| <blockquote>First, fuse ratings can be a bit misleading. A 10A ATO (automotive) fuse will conduct 11 amps for 100 hours minimum. At 13.5 Amps a 10A ATO fuse can take as long as 10 minutes to blow. It is not like once you draw 10 amps "poof" the fuse is gone. (From FUSE SIZING PRIMER located at http://www.powerlet.com/learningCenter/fuseSizing)</blockquote> | <blockquote>First, fuse ratings can be a bit misleading. A 10A ATO (automotive) fuse will conduct 11 amps for 100 hours minimum. At 13.5 Amps a 10A ATO fuse can take as long as 10 minutes to blow. It is not like once you draw 10 amps "poof" the fuse is gone. (From FUSE SIZING PRIMER located at http://www.powerlet.com/learningCenter/fuseSizing)</blockquote> | ||
| - | In general, for 12v wiring (13.5v source) where the length of the point-to-point runs (which equals 1/2 of the full circuit back to ground) are as follows,\\ | + | In general, for 12v wiring (13.5v source) where the length of the point-to-point runs (which equals 1/2 of the full circuit back to ground) are as follows, this rule-of-thumb chart is useful (max 3% voltage loss): |
| - | this rule-of-thumb chart is useful (max 3% voltage loss): | + | |
| | Max Amps For PtoP Cable Run Length Of |||| | | Max Amps For PtoP Cable Run Length Of |||| | ||
| - | | Gauge | 9-ft | 6-ft | 3-ft | | + | | Gauge | 3-ft | 6-ft | 9-ft | |
| - | | 18ga | 2.7-amps | 4-amps | 8-amps | | + | | 18ga | 8-amps | 4-amps | 2.7-amps | |
| - | | 16ga | 4.3-amps | 6-amps | 13-amps | | + | | 16ga | 13-amps | 6-amps | 4.3-amps | |
| - | | 14ga | 7-amps | 10-amps | 21-amps | | + | | 14ga | 21-amps | 10-amps | 7-amps | |
| - | | 12ga | 11-amps | 16-amps | 30-amps | | + | | 12ga | 30-amps | 16-amps | 11-amps | |
| - | | 10ga | 17-amps | 26-amps | 40-amps | | + | | 10ga | 40-amps | 26-amps | 17-amps | |
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| + | Also see this list of [[techtalk:evo:elec01#wire_gauges_-_by_circuit|Wire Gauge By Circuit]] for EVO Models. | ||
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| + | ===== Ohm's Law For DC ===== | ||
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| + | {{:techtalk:ref:elec:ohmslaw.jpg?400|}} | ||
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| + | The above values for DC power are: Voltage in whole Volts,\\ | ||
| + | Current in whole Amps and Resistance in whole Ohms.\\ | ||
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| + | For many basic symbols and formulas used in electronics, go to this page,\\ | ||
| + | [[https://tinkrlearnr.com/shop/uncategorized/newbie-electronics-hobbyist-cheatsheet-poster-bundle|TinkrLearnr]], which has downloadable images and posters. | ||
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| + | **Other Related Topics**\\ | ||
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| + | [[techtalk:ref:elec02|Electrical Tools - Multimeter, Spark Tester, Etc.]] | ||
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| - | ====== Next Subject ====== | ||
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