Washington Administrative Code › Title 296 - Labor and Industries, Department of › Chapter 296-870 - Powered platforms › Section 296-870-099 - Definitions

Current through Register Vol. 24-14, July 15, 2024
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.