Anemometer. An instrument for measuring
wind velocity.
Angulated roping. A suspension method
where the upper point of suspension is inboard from the attachments
on the suspended unit, thus causing the suspended unit to bear
against the face of the building.
Building face rollers. A specialized
form of guide roller designed to ride on the face of the building
wall to prevent the platform from abrading the face of the building
and to assist in stabilizing the platform.
Building maintenance. Operations such as
window cleaning, caulking, metal polishing, reglazing, and general
maintenance on building surfaces.
Cable. A conductor, or group of
conductors, enclosed in a weatherproof sheath, that may be used
to:
(a) Supply electrical power or control current for
equipment; or
(b) Provide voice communication circuits.
Carriage. A wheeled vehicle used for the
horizontal movement and support of other equipment.
Certification. A written, signed, and
dated statement confirming the performance of a requirement.
Combination cable. A cable having both
steel structural members capable of supporting the platform, and
copper or other electrical conductors insulated from each other and
the structural members by nonconductive barriers.
Competent person. Someone who:
(a) Is capable of identifying existing and
predictable hazards in the surroundings or working conditions which
are unsanitary, hazardous, or dangerous to employees; and
(b) Has the authority to take prompt corrective
measures to eliminate them.
Continuous pressure. Operation of a
control by requiring constant manual actuation for the control to
function.
Control. A system or mechanism used to
regulate or guide the operation of equipment.
Davit. A device, used singly or in
pairs, for suspending a powered platform from work, storage and
rigging locations on the building being serviced. Unlike outriggers,
a davit reacts its operating load into a single roof socket or
carriage attachment.
Design factor. The ratio of the rated
strength of the suspension wire rope to the rated working load. It is
calculated using the following formula:
F = (S x N)/W
Where:
F = Design factor
S = Manufacturer's rated strength of one suspension
rope
N = Number of suspension ropes under load
W = Rated working load on all ropes at any point of
travel.
Equivalent. Alternative design, material
or method to protect against a hazard. You have to demonstrate it
provides an equal or greater degree of safety for employees than the
method, material or design specified in the rule.
Existing installation. A permanent
powered platform installation that:
(a) Was completed before July 23, 1990; and
(b) Has had no major modification done after July 23,
1990.
Ground rigged davit. A davit which
cannot be used to raise a suspended working platform above the
building face being serviced.
Ground rigging. A method of suspending a
working platform starting from a safe surface to a point of
suspension above the safe surface.
Guide button. A building face anchor
designed to engage a guide track mounted on a platform.
Guide roller. A rotating cylindrical
member that provides continuous engagement between the suspended or
supported equipment and the building guides. It may operate
separately or as part of a guide assembly.
Guide shoe. A device that is similar to
a guide roller but is designed to provide a sliding contact between
the shoe and the building guides.
Hoisting machine. A device intended to
raise and lower a suspended or supported unit.
Installation. A powered platform
installation consists of all the equipment and the parts of the
building involved with using the powered platform for building
maintenance.
Interlock. A device designed to ensure
that operations or motions occur in proper sequence.
Intermittent stabilization. A method of
platform stabilization in which the angulated suspension wire ropes
are secured to regularly spaced building anchors.
Lanyard. A flexible line of rope, wire
rope or strap which is used to secure the body harness to a
deceleration device, lifeline or anchorage.
Lifeline. A component consisting of a
flexible line that connects to an anchorage at one end to hang
vertically (vertical lifeline), or that connects to anchorages at
both ends to stretch horizontally (horizontal lifeline). It serves as
a means for connecting other components of a personal fall arrest
system to the anchorage.
Live load. The total static weight of
workers, tools, parts, and supplies that the equipment is designed to
support.
New installation. A permanent powered
platform installation that was completed, or an existing installation
that has had major modifications done, after July 23, 1990.
Operating control. A mechanism
regulating or guiding the operation of equipment that makes sure the
equipment operates in a specific mode.
Operating device. A push button, lever,
or other manual device used to actuate a control.
Outrigger. A device, used singly or in
pairs, for suspending a working platform from work, storage, and
rigging locations on the building being serviced. Unlike davits, an
outrigger reacts its operating moment load as at least two opposing
vertical components acting into two or more distinct roof points
and/or attachments.
Poured socket. A method of providing
wire rope termination in which the ends of the rope are held in a
tapered socket by means of poured spelter or resins.
Primary brake. A brake designed to be
applied automatically whenever power to the prime mover is
interrupted or discontinued.
Prime mover. The source of mechanical
power for a machine.
Rated load. The manufacturer's specified
maximum load.
Rated strength. The strength of wire
rope, as designated by its manufacturer or vendor, based on standard
testing procedures or acceptable engineering design practices.
Rated working load. The combined static
weight of workers, materials, and suspended or supported
equipment.
Registered professional engineer. A
person who has been duly and currently registered and licensed by an
authority within the United States or its territories to practice the
profession of engineering.
Roof-powered platform. A powered
platform having the raising and lowering mechanism located on the
roof.
Roof-rigged davit. A davit used to raise
the suspended working platform above the building face being
serviced. This type of davit can also be used to raise a suspended
working platform which has been ground rigged.
Rope. The equipment, such as wire rope,
that is used to suspend a component of an equipment
installation.
Safe surface. A horizontal surface that
provides assurance that personnel occupying the surface will be
protected from falls. This protection can be provided by a standard
guardrail system or equivalent, a personal fall protection system, or
other equivalent method.
Secondary brake. A brake designed to
arrest the descent of the suspended or supported equipment in the
event of an overspeed condition.
Stability factor. The ratio of the
stabilizing moment to the overturning moment.
Stabilizer tie. A flexible line
connecting the building anchor and the suspension wire rope
supporting the platform.
Supported equipment. Building
maintenance equipment that is held in or moved to its working
position by means of attachment directly to the building or
extensions of the building being maintained.
Suspended equipment. Building
maintenance equipment that is suspended and raised or lowered to its
working position by means of ropes or combination cables attached to
some anchorage above the equipment.
Tie-in guides. The portion of a building
that provides continuous positive engagement between the building and
a suspended or supported unit during its vertical travel on the face
of the building.
Transportable outriggers. Outriggers
designed to be moved from one work location to another.
Type F powered platform. A powered
platform that has both of the following characteristics:
(a) The working platform is suspended by at least
four wire ropes and designed so that failure of any one wire rope
will not substantially alter the normal position of the working
platform; and
(b) Only one layer of hoisting rope is permitted on
the winding drums.
Type T powered platform. A powered
platform installation that has a working platform suspended by at
least two wire ropes. The platform will not fall to the ground if a
wire rope fails, but the working platform's normal position would be
upset.
Verified. Accepted by design,
evaluation, or inspection by a registered professional
engineer.
Weatherproof. Constructed or protected
so that exposure to the weather will not interfere with successful
operation.
Winding drum hoist. A type of hoisting
machine that accumulates the suspension wire rope on the hoisting
drum.
Working platform. The suspended or
supported equipment intended to provide access to the face of the
building and manned by persons engaged in building
maintenance.
Wrap. One complete turn of the
suspension wire rope around the surface of a hoist
drum.
