Mich. Admin. Code R. 408.7098 - Control and operating circuits
Rule 98. The design and installation of the control and operating circuits shall conform to all of the following:
(a) A control system which depends on
completion or maintenance of an electric circuit shall not be used for any of
the following:
(i) Interruption of the power
and application of machine brake at the terminals.
(ii) Stopping of the car when the emergency
stop switch in the car is opened or when any of the electrical protective
devices operate.
(iii) Stopping the
machine when the safety applies.
(b) A spring used to actuate a switch,
contactor, or relay to break the circuit to stop a car at the terminal shall be
of the compression type.
(c) The
failure of a single magnetically operated switch or relay or contactor to
release or operate in the intended manner, or the occurrence of a single
accidental ground, shall not permit the car to run.
Notes
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