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Why must electricians be extra careful when calculating power requirements for circuits that will run motors?
Wiki User
∙ 14y ago
The electrical code states that motor feeders have to be rated at 125% of the FLA of the motor. When wiring motor circuits always consider the ambient temperature (for wire de-rate purposes) where the motor is located and the 125% rule before selecting the correct wire size.
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Extra care must be taken when calculating power requirements for circuits that will carry electric motors because the current need of an electric motor is larger than calculated from its horsepower rating alone. Electric motors are highly inductive and also have an in-rush current requirement to get started. The circuit used to power an electric motor has to be capable of supplying the in-rush and steady state currents to the motor -- with an acceptable I^2-R loss on the wires.
Wiki User
∙ 14y ago
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