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Motor overload

MrJack96
What would make an motor overload trip before a breaker when a motor is to earth?
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    It was a 3 phase motor. Top bearing had gone and it was tripping the overload in a few seconds of running. When doing an IR test on the motor it was to earth. The resistance to earth was 1.8ohms.
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    It was a 3 phase motor. Top bearing had gone and it was tripping the overload in a few seconds of running. When doing an IR test on the motor it was to earth. The resistance to earth was 1.8ohms.
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