Posted by John T on January 02, 2010 at 09:24:18 from (66.244.97.31):
In Reply to: too small a wire posted by Dan-IA on January 02, 2010 at 07:47:29:
Dan, its NOT Rocket Science and as youre already aware Im sure,,,,,the smaller the wire and the longer the run THE MORE VOLTAGE DROP. One limiting and crucial factor IS GETTING THAT MOTOR STARTED as it might draw 5 or 6 times the run current to get it up n running.
WITHOUT doing any calculations, a 40 ft run of 14 gauge wire should do the job, subject to the motors exact specs...BUTTTTTTTTTTT for motors especially motor starting IT SURE WOULD SUIT ME BETTER IF YOU USED 12 GAUGE. Its just that heavy current draw at start up that makes motors a bit different then a resisitve load when making these calculations.
Get the motor nameplate data then do google for a voltage drop calculator given the wire gauge and current and length and then you can get a pretty exact answer, but my pure guess will still be 14 will work but 12 is better..
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