This article explores What is the starting current?, What is the starting current?, How to measure starting current?
What is the starting current?
Starting current, also called inrush current, is the initial peak of electrical current that flows through an electrical device or motor when it is first turned on. This current is significantly higher than the operating current because the motor must overcome inertia and start moving from a stopping position. During this phase, the motor consumes more power to establish movement and overcome initial resistance.
What is the starting current?
To measure starting current, you can use an ammeter or clamp meter designed to handle high inrush currents. A clamp meter can be placed around the motor power cable to measure the peak current during the cranking phase without interrupting the circuit. Alternatively, a digital multimeter with current measurement capability can be used, although it must be rated for the expected high current levels.
How to measure starting current?
The starting current value of a motor depends on several factors, including its type, size and design. Generally, the starting current can be 5-7 times higher than the full load operating current of the motor. For specific values, manufacturers often provide motor starting current data in technical specifications or datasheets.
For a 1 horsepower (HP) motor, the starting current is generally between 6 and 8 times its full load operating current. Since a 1 HP motor typically runs at around 746 watts (or around 3 to 5 amps at 230 volts), the starting current could be around 18 to 40 amps, depending on motor design and application . Exact values may vary, so it is best to refer to the manufacturer’s specifications for precise information.
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