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480-volt, 3 phase, squirrel cage motor with nameplate FLI of 32.5 amps ? Name Plate value not used 430.250: 25hp @480v = 34 amps 430.22(a): 34 X 125% = 42.5 amps 310.15(b)(16) : # 6 THHN @60ºC and 55 amps 25HP 480V 3Φ FLI ... 430.250: FLI’s, 3-phase, 480v 10hp Squirrel cage = 14 FLI 25hp Squirrel cage = 34 FLI
This course treats the subject of three phase power in detail and in a manner that a reader, well experienced in three phase circuits or otherwise, will find easy to follow. The course considers all of the possible types of three phase circuits - balanced, unbalanced, three wire, four wire, wye and delta circuits.
This course presents the means for calculating currents in the conductors of both balanced and unbalanced three phase circuits. Numerous diagrams and examples are used to illustrate the principles that are involved in relatively simple concepts. Balanced circuits are treated first.
14 mar 2016 · Three Phase Load Calculating kVA and kW (Three Phase) Formula: kVA = V x I x √3 ÷ 1000 Where: V = Volts generated I = Amps available P.F. - Power factor of load (Usually 0.8) √3 = 1.732. To calculate the current (Amps) I = kVA x 1000 ÷ V x √3. three-phase-load-calculator.xls (770 KB)
You can use this example to see how the 3-phase power calculator works: A 100 amps motor on a 240V 3-phase circuit with a 0.9 power factor produces 37.41 kW of electrical power. Insert these 3 quantities in the calculator, and you should get the same result.
What is the minimum ampacity of the branch circuit conductors for a 25 HP , 480-volt, 3 phase, squirrel cage motor with nameplate FLI of 32.5 amps ?
First the measured I1 and the measured phase power PPH are used to calculate. PC + PFW = PPH − I1 2R1 , where I12R1 is the copper loss in this no-load case, PC [W] is the per-phase core loss and PFW [W] is the per-phase friction-and-windage.
