Mich. Admin. Code R. 408.10577 - Control circuits; power circuits; components
Rule 577.
(1)
Electrical wiring and equipment shall be in compliance with the requirements
specified in General Industry Safety Standard Part 39 "Design Safety Standards
for Electrical Systems," as referenced in
R
408.10509, except as otherwise required by these
rules.
(2) An electrical runway
conductor system shall be of a type that is designed for use in exterior
locations and shall be located so that the system does not come into contact
with accumulated snow or water.
(3)
Cables shall be protected against damage that results from over-tensioning or
from other causes.
(4) Devices
shall be included in the control system for the equipment which will provide
protection against electrical overloads, 3-phase reversal, and phase failure.
The control system shall have a separate method, which shall be independent of
the direction control circuit, for breaking the power circuit if there is an
emergency or malfunction.
(5)
Suspended or supported equipment shall have a control system that will require
the operator of the equipment to follow predetermined procedures.
(6) All of the following requirements apply
to electrical protection devices:
(a) On
installations where the carriage does not have a stability factor of at least 4
against overturning, an electrical contact or contacts shall be provided and
connected so that the operating devices for the suspended or supported
equipment shall be operative only when the carriage is located and mechanically
retained at an established operating point.
(b) Overload protection shall be provided in
the hoisting or suspension system to protect against the equipment operating in
the "up" direction with a load of more than 125% of the rated load of the
platform.
(c) An automatic detector
shall be provided for each suspension point which will interrupt power to all
hoisting motors for travel in the "down" direction and which will apply the
primary brakes if any suspension wire rope becomes slack. A continuous-pressure
rigging-bypass switch that is designed for use during rigging is permitted.
This switch shall only be used by authorized personnel during
rigging.
(d) Upper and lower
directional switches that are designed to prevent the travel of suspended units
beyond safe upward and downward levels shall be provided.
(e) Emergency stop switches shall be provided
on remote controlled, roof-powered platforms that are adjacent to each control
station on the platform.
(f) Cables
that are in constant tension shall have overload devices which will prevent the
tension in the cable from interfering with the load-limiting device or with the
platform roll-limiting device. The setting of these devices shall be
coordinated with other overload settings at the time the system is designed and
shall be clearly indicated on or near the device. The device shall interrupt
the equipment travel in the "down" direction.
Notes
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