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How can you determine if a electric motor is 1 phase or 3 phase if there is no name plate?
Wiki User
∙ 12y ago
Check the motor's terminal box. If there are three service input cables - such as red, yellow and blue - plus an earth wire, then it is a three phase motor.
If there are only two wires plus an earth wire, then it is single phase.
Wiki User
∙ 12y ago
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