What is interlocks provided for the valve MCC

What is interlocks provided for the valve MCC 
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Answer :

a) Mechanical interlock, which will not allow the other contactor to close if one contactor, is closed. b) 42 auxiliary contacts are wired in the control ckt. 42-1 contact in 42-2 and 42-2 contact in 42-1. 
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Related questions

Why synchronizing scheme has been adopted? What are interlocks provided?

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Description : What are the advantages of motorised valve actuators?  

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