Ohio Admin. Code 4123:1-17-04 - Roof car suspended platforms - window cleaning
(A) Roof car.
(1) The horizontal speed of a roof car shall
be no more than fifty feet (15.2 meters) per
minute.
(2) A roof car may not be
moved horizontally unless means are in place to prevent the car from moving
outside the areas provided for roof car travel.
(3) The roof car shall be designed and
installed in such a manner as to remain stable and upright under every loading
condition.
(4) A roof car shall be
so positioned and anchored to the structure as to insure
ensure that the
working platform is placed and retained in proper position for vertical
travel.
(5) The operating device
controlling movement of a roof car shall be of the continuous pressure
weather-proof electric type and shall be
located on the roof car, the working platform, or both. If located on both,
such operating devices shall be interlocked so that control is possible only
from one at a time.
(6) The
operating device controlling movement of a roof car shall not be operable until
the working platform is at its uppermost position for travel and is not in
contact with the building face or fixed vertical guides in the face of the
building, and until all protective devices and interlocks are in a position for
movement.
(7) If the access to the
roof car at any point of its travel is not over the roof area, standard
guardrails with self-closing, self-locking gates shall be provided on the roof
car.
(B) Working
platforms.
(1) The working platform shall be
of girder or truss construction and shall
be capable of supporting its rated load under any position of
loading.
(2) Each working platform
shall bear the manufacturer's load rating plate, conspicuously posted and
legible, stating the maximum permissible load.
(3) The vertical speed of a working platform
suspended by four or more hoisting ropes shall be no more than seventy-five
feet (22.9 meters) per minute.
(4) The vertical speed of a working platform
suspended by less than four hoisting ropes shall be no more than thirty-five
feet (10.7 meters) per minute.
(5) The working platform shall be no less
than twenty-four inches (sixty-one centimeters)
wide.
(6) The working platform
shall be provided with toeboards and with permanent guardrails no less than
thirty-six inches (91.4 centimeters) high, and no
more than forty-two inches (106.7 centimeters)
high at the front (building side). At the rear, and on the sides, a standard
guardrail and toeboard shall be provided. An intermediate guardrail shall be
provided around the entire platform between the top guardrail and the
toeboard.
(7) The platform flooring
shall be of the nonskid type.
(8)
Where access gates are provided, they
Access gates shall be self-closing and self-locking.
Such
Access
gates are required where access to the working platform is not over the roof
area.
(9) A means shall be provided
to prevent inadvertent horizontal movement of the working platform.
(10) The operating device controlling
vertical movement of the working platform shall be of
the continuous pressure, weatherproof, and electric type and be located
on the working platform and shall be of the
continuous pressure weatherproof electric type.
(11) The operating device controlling
vertical movement shall be operable only when all electrical protective devices
and interlocks on the working platform are in normal operating position, and
the roof car is at an established operating point.
(12) On roof-powered platforms, an emergency
electric operating device shall be provided near the hoisting machine for use
in the event of failure of the normal operating device for the working platform
or failure of the traveling cable system. This emergency device shall be
mounted in a locked
secured compartment and shall have a legend mounted thereon reading: "For Emergency
Operation Only. Establish Communication With Personnel On Working Platform
Before Use."
be labeled with instructions for
use. A key for unlocking
means for opening the compartment housing the
emergency operating device shall be mounted in a break-glass receptacle located
near the operating device.
(C) Hoisting equipment.
(1) Hoisting equipment shall consist of a
power-driven drum or drums contained in the roof car,
( i.e.,
roof-powered platform,) or contained on the working platform,
( i.e.,
self-powered platform).
(2) Hoisting equipment shall be
power-operated in both up and down directions.
(3) Where exposed to contact, rotating
shafts, drums, couplings, and other mechanisms
and gears shall be guarded.
(4)
Friction devices or clutches shall not be used for connecting the main driving
mechanism to the drum or drums. Belt or chain-driven machines are
prohibited
not
permitted.
(5) Hoisting
motors shall be electric and of weather-proof construction.
(6) Hoisting motors shall be directly
connected to the hoisting machinery. Motor couplings, if used, shall be of
steel construction.
(7) Hoisting
machines shall have two independent braking means, each designed to stop and
hold the working platform with one hundred twenty-five per cent of rated
load.
(D) Hoisting ropes
and winding drums.
(1) Each hoisting rope
shall be made of wire and shall be no less
than five-sixteenths- inch
(eight millimeters) in diameter.
(2) Working platforms shall be suspended by
no less than two ropes with a safety factor of ten as calculated under the
following formula:
F = S x N÷W
Where
S = manufacturer's rated breaking strength of one rope
N = number of ropes under load
W = maximum static load on all ropes with the platform and its rated load at any point of its travel
(3) Where winding drums are used, the rope
shall be wound in level layers.
(4)
Winding drums shall have no less than three turns of rope remaining when the
working platform is at its lowest possible point of travel.
(5) Where the working platform is suspended
by more than two ropes, the nondrum ends of the ropes shall be provided with
individual shackle rods which will permit individual adjustment of rope
lengths.
(6) The lengthening or
repairing of wire ropes by splicing is prohibited
not
permitted.
(7)
More than two reverse bends in each rope are
prohibited
More than one reverse bend in the
length of each rope is not permitted.
(8) Wire rope shall not be used if, in any
length of eight diameters, the total number of visible broken wires exceeds ten
per cent of the total number of wires, or if the rope shows other signs of
excessive wear, corrosion, or defect.
(E) Electrical protective devices.
(1) Electrical protective devices and
interlocks shall be of the weather-proof type.
(2) When a traveling cable storage reel is
used, an electric contact shall be provided and so connected that
it
the traveling
cable storage reel will cause the relay for vertical travel to open, if the tension on the traveling cable exceeds safe
limits.
(3) An automatic overload
device shall be provided to cut off electrical power to the circuit in all
hoisting motors for travel in the up direction, should the load applied to the
hoisting ropes at either end of the working platform exceed one hundred
twenty-five per cent of its normal tension with rated load as shown on the
manufacturer's data plate on the working platform.
(4) An automatic device shall be provided for
each hoisting rope which will cut off electrical power to the hoisting motor or
motors in the down direction and will apply the brakes if any hoisting rope
becomes slack.
(5) Upper and lower
directional limit devices shall be provided to prevent the travel of the
working platform beyond the normal upper and lower limits of travel.
(6) Directional limit devices, if driven from
the hoisting machine by chains, tapes, or cables, shall incorporate a device to
disconnect the electric power from the hoisting machine and apply both the
primary and secondary brakes in the event of failure of the driving
means.
(7) On platforms with four
or more ropes, final terminal stopping devices for the working platform shall
be provided as a secondary means of preventing the working platform from
over-traveling at the terminals.
(8) Emergency stop switches shall be provided
in, or adjacent to,
each operating device.
(9)
Electrical cord strain relief anchors and grip or equivalent means shall be
provided to prevent the electrical cord from pulling on the
receptacle.
(F)
Emergency communications.
A means of two-way communication shall be provided for each roof car suspended platform for use in an emergency.
(G) Safety belts or harness and
lifelines.
A safety belt or harness with means
for attachment to a lifeline on the roof or to the working platform shall be
provided for each employee on a working platform suspended by less than four
wire ropes.
(G)
Fall protection.
Each employee on working platforms shall be protected by a personal fall arrest system.
Notes
Promulgated Under: 119.03
Statutory Authority: 4121.12, 4121.121, 4121.13, Const. Art. II, Sec. 35
Rule Amplifies: 4121.13
Prior Effective Dates: 04/01/1964, 01/01/1983, 03/15/2010
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