Refer to the circuit shown above. What is the purpose of the normally clos...

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Refer to the circuit shown above. What is the purpose of the normally closed auxiliary contacts between wire numbers 13 &14, and 18 & 19?

They ensure that both contactors can be energized at the same time.

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They provide electrical interlock for the circuit.

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They provide mechanical interlock for the circuit.

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They ensure that the stop button must be pressed before direction of the motor can be changed.

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