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Washington Administrative Code (Last Updated: November 23, 2016) |
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Title 296. Labor and Industries, Department of |
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Chapter 296-96. Safety regulations and fees for all elevators, dumbwaiters, escalators and other conveyances. |
Section 296-96-23276. What requirements apply to phase reversal and failure protection methods?
Latest version.
- Elevators having polyphase alternating current power supply must be equipped with a means to prevent the starting of the elevator motor if the phase rotation is in the wrong direction or if there is a failure of any phase.This protection may be considered to be provided in the case of generator field control having alternating current motor-generator driving motors, provided a reversal of phase will not cause the elevator driving machine motor to operate in the wrong direction. Controllers on which switches are operated by polyphase torque motors provide inherent protection against phase reversal or failure.