1	I Don’t Have Water !! Pump selection HP or GPM Pressure tank How much drawdown? Electrical problems Pump voltage Motor amperage
2	I Don’t Have Water !! Pump selection - HP or GPM Pressure or flow? ½ hp 10 gpm pump vs ½ hp 5 gpm pump ½ hp 10 gpm pump vs 1 hp 5 gpm pump
3	I Don’t Have Water !! Pressure tank drawdown How much is enough? Is it waterlogged? Is it the right size for your pump?
4	I Don’t Have Water !! Electrical Problems Pump voltage What size wire is that? Motor amperage How many amps?
5	How Many Amps ?
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7	Motors & Voltage Motor voltage ratings are 230 volts and 115 volts ± 10% 230 volt motor works from 207 to 253 volts 115 volt motor works from 103½ to 126½ volts Commercial motors may be rated @ 380, 460 & 575 volts
8	Motors & Wires A two wire motor has three wires A three wire motor has four wires 230 volt motor with two wires has two or three legs two hot & one ground 115 volt motor with two wires has two legs one hot & one neutral
9	Motors & Voltage 1 HP = .746 kW = 746 watts 746 watts ÷ 230 volts = 3.24 amps 746 watts ÷ 115 volts = 6.49 amps 115 volt ½ hp motor requires twice the amperage of a 230 volt ½ hp motor
10	Motors & Wire Sizing Motor must receive current within 10% of rating to operate properly Too long a run with too small a wire will cause too much voltage drop Lower voltage must have higher amperage to compensate Low voltage = higher amperage = heat
11	Pump Wire Sizing Measure distance from service entrance to pump motor Determine pump voltage Determine pump horsepower Check chart for wire size
12	Pump Wire Sizing The pressure tank and pressure switch are located next to the electric supply. The well is located 160 feet from the pressure switch. A single-phase 230 volt pump with a ¾ hp motor is to be installed 150 feet deep in a 300’ well. What is the minimum size wire to run from the pressure switch to the pump?
13	Pump Wire Sizing Distance from service entrance to wellhead is 160’ Depth to pump motor is 150’ Total distance is 310’ Pump motor is 230 volts Pump motor is ¾ hp Check chart for wire size
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15	Pump Wire Sizing Distance from service entrance to pump motor is 310’ Pump motor is 230 volts Pump motor is ¾ horsepower Chart requires #12 wire for 301’ to 460’
16	115 volt & 230 volt Motors
17	I Don’t Have Enough Water !! Water volume Waterline Pump Inconsistent delivery Waterlogged pressure tank Pre-charge / pressure switch Thermal overload Well production
18	"John Nykamp" John Nykamp, R.S. Environmental Health Program Specialist Guilford County Public Health Department 400 W. Market St Greensboro, N.C. 27401 (336)641-4807 (336)641-7613 FAX (336)641-3730 jnykamp@co.guilford.nc.us Well Contractor Certification Commissioner http://www.ncwelldriller.org/