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Trinity Technologies - Electric Formulas

E = Voltage / I = Amps /W = Watts / PF = Power Factor Eff = Efficiency /
HP = Horsepower

 AC/DC Formulas To Find Direct Current AC / 1phase 115v or 120v AC / 1phase 208,230, or 240v AC 3 phase All Voltages Amps when Horsepower is Known HP x 746 E x Eff HP x 746 E x Eff X PF HP x 746 E x Eff x PF HP x 746 1.73 x E x Eff x PF Amps when Kilowatts is known kW x 1000 E kW x 1000 E x PF kW x 1000 E x PF kW x 1000 1.73 x E x PF Amps when kVA is known kVA x 1000 E kVA x 1000 E kVA x 1000 1.73 x E Kilowatts I x E 1000 I x E x PF 1000 I x E x PF 1000 I x E x 1.73 PF 1000 Kilovolt-Amps I x E 1000 I x E 1000 I x E x 1.73 1000 Horsepower (output) I x E x Eff 746 I x E x Eff x PF 746 I x E x Eff x PF 746 I x E x Eff x 1.73 x PF 746
 Three Phase Values For 208 volts x 1.732, use 360 For 230 volts x 1.732, use 398 For 240 volts x 1.732, use 416 For 440 volts x 1.732, use 762 For 460 volts x 1.732, use 797 For 480 Volts x 1.732, use 831

E = Voltage / I = Amps /W = Watts / PF = Power Factor Eff = Efficiency
HP = Horsepower

 AC Efficiency and Power Factor Formulas To Find Single Phase Three Phase Efficiency 746 x HP E x I x PF 746 x HP E x I x PF x 1.732 Power Factor Input Watts V x A Input Watts E x I x 1.732
 Power - DC Circuits Watts = E xI Amps = W / E
 Ohm's Law / Power Formulas P = watts I = ampsR = ohms E = Volts

Voltage Drop Formulas
Single Phase
(2 or 3 wire)
VD = 2 x K x I x L
CM
K = ohms per mil foot

(Copper = 12.9 at 75°)

(Alum = 21.2 at 75°)
 Note: K value changes with temperature. See Code chapter 9, Table 8

L = Length of conductor in feet

I  = Current in conductor (amperes)

CM
= Circular mil area of conductor

CM= 2K x L x I
VD
Three Phase VD= 1.73 x K x I x L
CM
CM= 1.73 x K x L x I
VD

TRINITY TECHNOLOGIES LLC
CORPORATE OFFICE: 4605 PFLAUM ROAD - MADISON, WI 53718 - (608) 221-2333
BALTIMORE OFFICE: 1550 CANTON CENTER DR., BALTIMORE, MD 21227     