I was wondering what cable size to use for wiring a 125V 12 amp fan that is
100 feet away from the breaker panel.Thanks.
I was wondering what cable size to use for wiring a 125V 12 amp fan that is
100 feet away from the breaker panel.Thanks.
You should be able to use 14 gauge wire.
It'll drop about 4 volts at 12 amps over that length, but that shouldn't worry a fan much.
HTH,
Jeff
You could use #14, but there will be a lot of VD at startup, which won't be too good for the fan. #12 isn't all that much more expensive.
How did you determine that, and how much, specifically, are you thinking is "a lot" for a fractional hp fan motor???
That's true, certainly, and I have pretty much quit using 14, but if it's a dedicated circuit I don't think there's a chance in the world the difference would make any practical difference at all.
If, otoh, there's a chance of wanting something else, that would necessitate it in all likelihood.
--
Not to nitpick but wouldn't a motor drawing 12 running amps (if the OP is correct) be in the realm of a couple hp? If I recall my 5 hp compressor motor draws around 12.
Not at 120V it don't. A "true" 5HP motor will draw somewhere around 40A on 120V, or 20A on 240V. (On motors >= 1HP, count on approximately
900-1000W/HP because of inefficiencies. Yes, I know, the exact conversion is 746W/HP, but no motor is 100% efficient)At 120V, a standard 12A motor is probably between 3/4 and 1HP, tho possibly as low as 1/2HP. Not lower unless it's a real lousy or poorly spec'd motor. (Serious fan in any case...)
A 12A motor can draw well over three (or even five) times that much during startup. 12V or more drop (assuming the previous math was right) at 100'. That's a significant amount, and will significantly prolong startup and produce more heat, and ultimately shorten the fan motor's lifetime. Perhaps by not much, but perhaps by quite a bit.
This is a good place to go up a wire size. It's cheap.
You're correct about that, and using 12 gauge might be a wise investment.
Currently Lowes' price for 100 ft of 14 gauge is $36.00 vs. $52.50 for
12 gauge.Jeff
I used to work with Baldor repulsion/induction motors in the oilfield. There were all 240v, 15 hp. If memory serves, on the well upstroke they drew around 30 amps and otherwise around 18.
Don't know who you are; I have you blocked for the stupid things you have said in the past. For good reason, here is one more!
12a is not a fractional hp motor. Don't you even bother to read the posts?
Borderline on a 15A circuit. 12 ga. would be better. 20 A breaker
Ever read the NEC for voltage drop allowances?
Priced copper wire recently?
Not recently, but if I advised something which wouldn't meet code then I apologize and stand corrected.
I just figured that a 4 volt drop would still furnish a fan motor with sufficient power to do its thing.
Jeff
According to Meat Plow :
240V at 30A is 7200W, which means that during the upstroke those motors were delivering somewhere around 6-8 HP. Conservative motor selection, given that weather/rig conditions etc could cause the motor to need more.It would have been interesting to compare that with the motor plate ratings, or know what size the fuses/breakers were.
They lie. Campbell Hausfeld lost a class axction suit over it. I ended up with a sheet metal nibbler out of it.
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