Mich. Admin. Code R. 408.7094 - Safeties and governors
Rule 94.
(1) A
car shall be provided with a car safety capable of stopping and sustaining the
car with a rated load.
(2) The car
safety shall be of the inertia or other type approved by the board, operated as
a result of the breakage of the hoisting mechanism or by a speed governor. A
governor of the speed-governor type shall operate to set the safety at a speed
of not more than 175 feet per minute and on breakage of the suspension means.
The safety shall operate without appreciable delay and independently of the
governor speed action.
(3) If a
speed governor is used, then it shall be located where there is sufficient
space for full movement of the governor parts and where the governor cannot be
struck by the car or counterweight in case of overtravel.
(4) A safety operated switch shall be
provided to open the motor-control circuit and the brake-control circuit before
or at the time the safety applies.
(5) A governor rope shall be of iron, steel,
Monel Metal, or phosphor bronze not less than 1/4 inch in diameter. Tiller-rope
construction shall not be used for a governor rope.
(6) An elevator of the winding-drum type or
roller chain drive type shall be provided with a slack-rope device of the
manually reset type which will remove the power from the motor and brake if the
car is obstructed in its descent and the hoisting chain or rope
slackens.
(7) A car safety device
which depends upon completion of maintenance of an electric circuit for
application of the safety shall not be used. A car safety shall be applied
mechanically.
(8) Cast iron shall
not be used in construction of any part of a car safety, the breakage of which
would result in failure of the safety to function to stop and sustain the
car.
(9) A test of a car safety
shall be made with a rated load in the car before the elevator is put into
service. Governor operation of an instantaneous-type safety shall be tested at
rated speed by tripping the governor by hand. A safety operated as the result
of the breaking of the hoisting mechanism shall be tested by obtaining the
necessary slack rope to cause it to function.
(10) An overspeed governor shall be provided
for a traction machine.
Notes
State regulations are updated quarterly; we currently have two versions available. Below is a comparison between our most recent version and the prior quarterly release. More comparison features will be added as we have more versions to compare.
No prior version found.