Quick Answer: How do you calculate amps on a 3 phase motor?

How do I know how many amps my 3 phase motor is?

Divide the power consumption in watts by the line voltage multiplied by the power factor to find the amperage. For three phase circuits the power factor is the square root of 3. If your calculator doesn’t have a square root function, use 1.73 as an approximation of the square root of 3.

How do you find the amperage of a motor?

Given horsepower and volts, it is possible to calculate amps. The calculation of amps uses Ohm’s Law, which is amps times volts equals watts. Multiply the horsepower by 746 watts. For example, an engine at two horsepower with 230 volts would be calculated as two horsepower times 746 watts, which equals 1492.

How do you convert HP to amps?

Converting horsepower to amps can be done in a few simple steps, or using this simple formula.

  1. Amps = (Horsepower × 746) ÷ Efficiency ÷ Volts.
  2. Watts = Horsepower × 746.
  3. Watts = Wattsη
  4. Amps = Watts ÷ Volts.
  5. Amps = HP × 746V × η × PF.
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How many amps does a 1 HP 3 phase motor draw?


HP 1 Phase Amps 3 Phase Amps
115 volt 208 volt
1/2 9.8 2.4
3/4 13.8 3.5
1 16 4.6

How many amps is a 3 phase supply?

On a 3 phase 4 wire system at 220/380 volts, a load of 60KW total or 20kw per phase, MUST be about 100 amps per phase. Therefore a measured phase current of 350 amps implies that the actual load must be a lot higher than 60kw.

What is the full load current of a 1 hp motor?

Full Load Current: Three Phase AC Motors

Motor Horsepower Motor Ampere
1 230V 460 V 4.2 2.1
1-1/2 230V 460V 6.0 3.0
2 230V 460V 6.8 3.4
3 230V 460V 9.6 4.8

How many amps does a 40 hp motor draw?

AC Motor Full Load Amperes

HP 200 Volts 220-240 Volts
25 78.2 68
30 92 80
40 120 104
50 150 130

How much current would a 1.5 HP 240v motor draw?

The 1.5 HP Baldor motor that turns at 1725 will draw 18 amps according to its name plate.

What is the formula of power in 3 phase?

P = √3 × pf × I × V

This simply states that the power is the square root of three (around 1.732) multiplied by the power factor (generally between 0.85 and 1, see Resources), the current and the voltage.

How many volts is a 3 phase line?

For three-phase, you connect line 1 to line 2 and get 208 volts. At the same time, you [can] connect line 2 to line 3 and get 208 volts. And you [can] connect line 3 to line 1 and get 208 volts.

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How do you calculate the full load current of a 3 phase motor?

Look at the above formula, the three-phase full load current is equal to Power divided by the 3 times of product of line to neutral voltage and power factor. Here three-phase full load current is equal to the power divided by 1.732 times of line to line voltage and power factor.

How much current can a 5 hp motor take?

Full-Load Current in Amperes Single-Phase Alternating Current Motors

HP 115V 230V
5 56 28
7-1/2 80 40
10 100 50
The voltages listed are rated motor voltages. The listed currents are for system voltage ranges of 110 to 120 and 220 to 240.

How many amps is a size 3 starter good for?

NEMA size

NEMA size Max. continuous amperes Max. HP at 230 V, AC
3 90 35
4 135 50
5 270 100
6 540 200

How many amps does a 1.5 HP well pump draw?

How many amps does a 1.5 HP well pump draw? Member. A 230v 1.5 HP submersible pump is metering about 11.4 amps per leg.

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