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normally open and normally close contacts cannot be close simultaneously?

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter5: Components, Symbols, And Circuitry Of Air-conditioning Wiring Diagrams

Section: Chapter Questions

Problem 6RQ: What do the terms normally open and normally closed refer to with regard to a switch or set of...

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Why is it that normally open and normally close contacts cannot be close simultaneously?

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