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Assuming that the listed exception do not apply the NEC states that the minimum number of overload units required for a three-phase alternating current motor shall be?
Wiki User
∙ 14y ago
Each leg of a three phase motor must have overload protection. There is no minimum. Older magnetic contactors used to only protect two legs but occasions arose out of this configuration that would cause the motor to single phase on an overload condition. The code was changed to stop this condition from happening so now all three legs must be protected.
Wiki User
∙ 14y ago
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What is the inverse time of the thermal overload?
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