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Tool Talk Discussion Forum

Electrical question....

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Nathan-Ga

02-16-2005 19:47:37




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How far is too far for 10-2 w/ground to power a 1.5hp submersible pump, 10amps(I think)? Pump set at 130ft.

Is 250ft within reason?




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Bill in IN

02-18-2005 05:12:30




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 Re: Electrical question.... in reply to Nathan-Ga, 02-16-2005 19:47:37  
The distance is probably not the problem- but if you leave the wire spooled or coiled you will probably lose the motor. Nothing like an inductive coil to let the smoke out of a perfectly good motor...



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Nathan-Ga....sorry....

02-17-2005 15:17:47




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 Re: Electrical question.... in reply to Nathan-Ga, 02-16-2005 19:47:37  
Sorry, I should have explained better. The pump is at 130ft using the wire the well drillers use(red, yellow, ect.) to the box at the tank. The temporary power pole is about 140ft from the tank and pressure switch.

I'm not exactly sure how far the electrical panel will be in the house when it's built, but shouldn't be no more than 30 more feet from the pole. Instead of cutting the wire short, I wondered if it would be ok to use the 250ft roll of 10-2 for the time being from the pressure switch to the temporary box. The well will only be used for the contractors until the house is finished.

Thanks

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dr.sportster

02-17-2005 16:16:33




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 Re: Electrical question.... in reply to Nathan-Ga....sorry...., 02-17-2005 15:17:47  
I tried to calculate this and for a 12awg circuit I got 5.8% VD.Im pretty sure this has come out wrong.In general I dont think VD will come into play under 4-500 ft for a 12awg circuit let alone 10 gauge.I tried to use VD=KIL/cma with k as 10.4 ohms.the answer of 5.8% sure seems too high.12 maybe small 10 definitly 8 way too big .I dont know.Besides it will only burn up the grass and the guys temp panel.OK not helpful.Ill shutup now.

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Keith-OR

02-17-2005 19:50:10




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 Re: Electrical question.... in reply to dr.sportster, 02-17-2005 16:16:33  
Use this website to detremine your needs.
HTH...Keith



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dr.sportster

02-18-2005 05:51:47




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 Re: Electrical question.... in reply to Keith-OR, 02-17-2005 19:50:10  
Keuth,I could not get that thing to work right.It says NaN whatever that means.



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dr.sportster

02-18-2005 06:17:08




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 Re: Electrical question.... in reply to dr.sportster, 02-18-2005 05:51:47  
OK I got it to work;I used 250ft as distance;for 120v feed at 9.8 amps it has 115volts at the motor.4.33%VD.For same distance at 240 volt4.6 amps has 238volts at the motor and 2.03%VD.this is all calculated using 10 awg and the site Keith suggested.Amperages were calculated off the 11/2 hp rating.10 guage is ok at either voltage.Didnt try 12 awg.Thanks Keith good site for not burning up equipment.

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lucasss

02-17-2005 06:46:18




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 Re: Electrical question.... in reply to Nathan-Ga, 02-16-2005 19:47:37  
youd be correct using #8 wire. if you dont beleive me,just run 12 on top of the ground and try it before you dig.. lucas



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LBJ

02-17-2005 15:54:44




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 Re: Electrical question.... in reply to lucasss, 02-17-2005 06:46:18  
Franklin Electric specs a 1.5 HP submersable pump motor is good to 480 feet total run of #10 wire, 2 or 3 wire single phase application.



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buickanddeere

02-16-2005 21:14:49




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 Re: Electrical question.... in reply to Nathan-Ga, 02-16-2005 19:47:37  
Is 250 ft, 120 feet from the electrical service panel to the well and 130 feet down? If so #10 is required. A lightening surge supressor on that well circuit. And even on the mains of the service panel is less bother than pulling up a struck pump.



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bigwood

02-16-2005 20:00:42




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 Re: Electrical question.... in reply to Nathan-Ga, 02-16-2005 19:47:37  
you can use #12 with out a problem.



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