Posted by John T on November 21, 2013 at 14:47:45 from (216.249.76.176):
In Reply to: Motor wire size posted by 37Chief on November 21, 2013 at 12:05:38:
Heres an engineering approach and answer:
1) HAVE TO KNOW THE FLA TO GIVE AN ANSWER
HOWEVER I can make some educated guesses as follows:
2) ASSUMING That 1/2 HP Motor draws around 10 Full Load Amps if operated at 120 VAC Single Phase
3) The smallest wire I would specify would have to have a MINIMUM ampacity of 125% x 10 or say 13 amps. (Radio is very small draw I'm assuming, less then an amp Im guessing, but no warranty absent the radio specs)
4) 14 Gauge wire (in general, subject to enclosure and insulation and temperature) is rated for 15 amps
THEREFORE 14 gauge will suffice and meet code
HOWEVERRRRRRRRRRR If I were designing the circuit I would over engineer it a bit and allow room for expansion and even less voltage drop and even a biggggggg radio lol and go for a more useable standard typical 20 amp shop branch circuit
ALSO if the motor draws 10 amps you don't have much excess wiggle room to plug another load (in addition to radio) into the branch circuit if 13 to even 15 amps is all it can handle.
SO I WOULD USE 12 GAUGE WIRE (and that even reduces voltage drop some small extent)
Of course, heck you could go with 10 or 8 gauge wire and it can work but theres such a thing as too much overkill unless you plan to use a MUCH bigger motor in the future. Also, if youre gonna wire a typical box and a 15 or 20 amp receptacle (are you????) that wire is kind of BIG to fit and terminate!!!!
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