ANSI: American National Standards Institute.
Approved: Sanctioned, endorsed, accredited, certified, or accepted as
satisfactory by a duly constituted and nationally recognized authority or agency.
Authorized person: A person approved or assigned by the
employer to perform a specific type of duty or duties or to be at a specific location or locations at the jobsite. See Designated person.
Certified: Equipment is "certified" if it (a) has been tested
and found by a nationally recognized testing laboratory to meet nationally recognized standards or to be safe for use in
a specified manner; or (b) is of a kind whose production is periodically inspected by a nationally recognized testing
laboratory; and (c) it bears a label, tag, or other record of certification.
Competent person: One who is capable of identifying existing and
predictable hazards in the surroundings, or working conditions which are unsanitary, hazardous, or dangerous to
employees, and who has authorization to take prompt corrective measures to eliminate them.
Construction work: Work for construction, alteration, and/or
repair, including painting and decorating.
Defect: Any characteristic or condition which tends to weaken or reduce
the strength of the tool, object, or structure of which it is a part.
See Authorized person.
Every laborer or mechanic, regardless of the contractual relationship which may
be alleged to exist between the laborer and mechanic and the contractor or
subcontractor who engaged him. "Laborer" generally means one who performs manual
labor or who labors at an occupation requiring
physical strength; "mechanic" generally means a worker skilled with tools.
Employer: Contractor or subcontractor.
Equivalent: Alternative designs, materials, or methods to protect
against a hazard which the employer can demonstrate will provide an equal or greater degree of safety for employees than
the methods, materials or designs specified in the standard.
Hazardous substance: A substance which,
by reason of being explosive, flammable, poisonous, corrosive, oxidizing, irritating, or otherwise harmful, is
likely to cause death or injury.
Qualified Person: One who, by possession of a recognized degree,
certificate, or professional standing, or who by extensive knowledge, training, and experience, has successfully
demonstrated his ability to solve or resolve problems relating to the subject matter, the work, or the project.
Safety factor: The ratio of the ultimate breaking strength of a
member or piece of material or equipment to the actual working stress or safe load when in use.
SAE: Society of Automotive Engineers.
Suitable: That which
fits and has the qualities or qualifications to
meet a given purpose, occasion, condition, function, or circumstance.
Ampere: The unit by which the flow of current
through a conductor is measured.
Arc: A discharge of electricity through a gas, such as air.
Attachment Cap: See Plug.
Circuit: The path along which electric current flows from start to finish is called a circuit.
The circuit includes the generator or battery which starts the current, the wires, and any electrical device that the
current operates. If any part of the circuit is removed, the current cannot flow. The circuit is then broken or open. Because electric current seeks to complete its circuit, it will travel along any path that is presented (path of
least resistance), which is why humans are at risk of electrocution when they handle damaged tools or cords, or contact
un-insulated wires. In effect, they become part of the circuit.
Circuit breaker: A protective device which automatically opens, or trips, a
circuit, without damage to itself, when the current exceeds a predetermined level.
Conductor: A substance or body that allows a current of electricity to pass
continuously along it. Metals, such as copper or aluminum, are good conductors. In a circuit, current-carrying wires are
termed "conductors", as in a flexible cord.
Current: The flow of electrons through a conductor, measured in amperes
(amps). If the current flows back and forth through a conductor, it is called alternating current
(AC). If the current flows in one direction only, as in a car battery, it is called direct current
(DC). AC is most widely used because it is possible to increase ("step up") or decrease ("step
down") the current through a transformer. For example, when current from an overhead power line is run
through a pole-mounted transformer, it can be stepped down to normal household current. Also, alternating current can
travel enormous distances with little loss of voltage, or power.
Cycle: When alternating current flows back and forth
through a conductor, it is said to cycle. In each cycle, the electrons flow first in one direction, then the other. In the
United States, the normal rate for power transmission is 60 cycles per second, or 60 Hertz (Hz).
De-energize: To free from any electric
connection and/or electric charge.
Electricity: The flow of an atom's electrons through a
Electrode: A conductor used to establish electrical contact with a
nonmetallic part of a circuit.
Energize: To direct electric current through a
conductor. Power lines and wires can be intentionally energized (or de-energized) to carry
current to an electrical device. But conductive surfaces which are unintentionally energized, like the
metal case of a tool, the metal housing of a circuit box, or a metal object such as
an aluminum ladder, present a danger of electrocution.
Fault: An insulation failure that
exposes electrified conductors, causing current to leak
and possibly resulting in electric shock.
Fuse: A protective device which
allows a piece of metal to become part of a circuit. The metal melts under heat created by excessive
current, thereby interrupting the circuit and preventing the flow of
electricity from exceeding the circuit's current-carrying capacity.
GFCI (Ground-fault circuit interrupter): A device that detects an insulation failure by
comparing the amount of current flowing to electrical equipment with the amount of current returning from the equipment.
Whenever the difference is greater than 5 milliamps, the GFCI trips and thereby interrupts the flow of electricity.
Ground: A conducting connection, intentional or unintentional, between an electrical
circuit or equipment and the earth, or to some conducting body that serves in place of the earth.
Ground-fault: A fault, or insulation failure, in the
wire used to create a path to ground.
Grounding: To prevent the buildup of hazardous
voltages in a circuit by creating a low-resistance path to earth or some other ground plane.
Guarding: Placement of live parts of electrical equipment where they cannot
accidentally be contacted, such as in a vault, behind a shield, or on a raised platform, to which only qualified persons
Impedance: Opposition to the flow of alternating (AC)
electric current. See Resistance.
Insulation: Non-conductive materials used to cover or surround a conductor,
permitting it to be handled without danger of electric shock.
Insulator: Any material, such as glass or rubber, that
prevents the flow of electric current.
Kilowatt: One thousand watts.
Lockout: To lock a switch in the "off" position
by means of a padlock, or to lock electrified equipment behind a locked door, to which only qualified persons have the key.
Low-Impedance: Low resistance to A/C current.
Milliampere: A unit of measurement equaling
one thousandth (1/1000) of an ampere.
Ohm: The unit by which resistance to
electrical current is measured. From Ohm's Law (Current=Voltage/Resistance, or in other words, Current=Voltage/Ohms), a
mathematical expression of the relationship between these three elements.
Overcurrent: Any current in excess of the rated
capacity of equipment or of a conductor.
Phase: In AC power systems, load current is
drawn from a voltage source which typically takes the form of a sine wave. Ideally, the current drawn
by the loads in the system is also a sine wave. With a simple, resistive load such as a light bulb, the current
sine wave is always aligned with the voltage sine wave. This is called single-phase. A single-phase power system
normally uses three wires, called hot, neutral, and ground, and the voltage is typically 120/240. Most home and
office outlets operate in this manner. With some loads, such as motors, and in high voltage systems, the current
sine wave is purposely delayed and lags behind the voltage sine wave. The amount of this lag is expressed in degrees and
is called a phase difference. A common example is three-phase power, where the system has three "hot" wires,
each 120 degrees out of phase with each other.
Plug: A device to which the conductors of
a cord are attached, which is used to connect to the conductors permanently attached to a receptacle.
Polarity: The relationship between poles of
positive and negative charge, particularly with regard to wiring of conductors where the ungrounded (hot) conductor and
grounded (neutral) conductor form a circuit.
Qualified Person: One familiar with the
construction and operation of the equipment and the hazards involved.
Rating: The stated operating limit of a piece of
equipment, expressed in a unit of measure such as volts or watts.
Raceway: A channel designed expressly for
holding wires, cables, or busbars, including conduit, tubing, wireways, busways, gutters, or moldings.
Receptacle: A device, such as a jack or an
outlet, to which conductors are attached, and where a plug makes contact with a source of electric current.
Resistance: Anything that impedes the
flow of electricity, particularly in direct (DC) current. Resistance is measured in ohms.
Tag: To identify electric equipment by class, group, and
the temperature range for which it is approved.
Volt: The unit by which electrical force or pressure is measured.
Voltage: The fundamental force or pressure that
causes electricity to flow through a conductor. Measured in volts.
Watt: The unit by which electric energy, or
the ability of electricity to do work, is measured. A thousand watts, or one kilowatt, equals 1.34 horsepower.
Adjustable suspension scaffold: A suspension scaffold equipped
with a hoist that can be operated by an employee on the scaffold.
Anchorage: A secure point of attachment for lifelines, lanyards, or
Body belt: A strap with means both for securing it about the waist and
for attaching it to a lanyard, lifeline, or deceleration device. (As of January 1, 1998 body belts are not acceptable as
part of a personal fall arrest system.)
Body harness: Straps which may be secured about the employee in a
manner that will distribute the fall arrest forces over at least the thighs, pelvis, waist, chest, and shoulders, with
means for attaching it to other components of a personal fall arrest system.
Brace: A rigid connection that holds one scaffold member in a fixed
position with respect to another member, or to a building or structure. See Cross braces.
Cleat: A structural block used at the end of a platform to prevent the
platform from slipping off its supports. Cleats are also used to provide footing on sloped surfaces such as crawling
Connector: A device that is used to couple (connect) parts of the
personal fall arrest system and positioning device systems together. It may be an independent component of the system,
such as a carabiner, or it may be an integral component of part of the system, such as a buckle or D-ring sewn into a
body belt or body harness, or a snaphook spliced or sewn to a lanyard or self-retracting lanyard.
Controlled access zone (CAZ): An area in which certain
work (e.g., overhand bricklaying) may take place without guardrail systems, personal fall arrest systems, or safety net
systems, and access to the zone is controlled.
Cross braces: Two braces which cross each other in the form of an X.
Deceleration device: Any mechanism, such as a rope grab,
rip-stitch lanyard, specially-woven lanyard, tearing or deforming lanyard, automatic self-retracting lifeline/lanyard,
etc., which serves to dissipate a substantial amount of energy during a fall arrest, or otherwise limit the energy
imposed on an employee during fall arrest.
Deceleration distance: The additional vertical distance a
falling employee travels, excluding lifeline elongation and free fall distance, before stopping, from the point at which
the deceleration device begins to operate. It is measured as the distance between the location of an employee's body
belt or body harness attachment point at the moment of activation (at the onset of fall arrest forces) of the
deceleration device during a fall, and the location of that attachment point after the employee comes to a full stop.
Fabricated frame scaffold: A scaffold consisting of
platforms supported on fabricated end frames with integral posts, horizontal bearers, and intermediate members.
Failure: Load refusal, breakage, or separation of component parts. Load
refusal is the point where the ultimate strength is exceeded.
Free fall: The
act of falling before a personal fall arrest system begins to apply force to arrest the fall.
Free fall distance: The vertical displacement between onset of
the fall and just before the fall arrest system begins to apply force to arrest the fall. This distance excludes
deceleration distance, and lifeline/lanyard elongation, but includes any deceleration device slide distance or
self-retracting lifeline/lanyard extension before they operate and fall arrest forces occur.
Guardrail system: A barrier erected to prevent employees from
falling to lower levels.
Hole: A gap or void 2 inches (5.1 cm) or more in its least dimension, in a
floor, roof, or other walking/working surface.
Hoist: A manual- or power-operated mechanical device to raise or lower a
Infeasible: Impossible to perform the construction work using a
conventional fall protection system (i.e., guardrail system, safety net system, or personal fall arrest system) or
technologically impossible to use any one of these systems to provide fall protection.
Ladder stand: A mobile, fixed-size, self-supporting ladder
consisting of a wide flat tread ladder in the form of stairs.
Landing: A platform at the end of a flight of stairs.
Lanyard: A flexible line of rope, wire rope, or strap which generally has
a connector at each end for connecting the body belt or body harness to a deceleration device, lifeline, or anchorage.
Leading edge: The edge of a floor, roof, or formwork for a floor or
other walking/working surface (such as the deck) which changes location as additional floor, roof, decking, or formwork
sections are placed, formed, or constructed. A leading edge is considered to be an "unprotected side and edge"
during periods when it is not actively and continuously under construction.
component consisting of a flexible line connected vertically to an anchorage at
one end (vertical lifeline), or connected horizontally to anchorages at both
ends (horizontal lifeline), and which serves as a means for connecting other
components of a personal fall arrest system to the anchorage.
Low-slope roof: A roof having a slope less than or equal to 4 to 12 (vertical to horizontal).
Lower levels: Those areas or surfaces to which an employee can fall.
Such areas or surfaces include, but are not limited to, ground levels, floors, platforms, ramps, runways, excavations,
pits, tanks, material, water, equipment, structures, or portions thereof.
Maximum intended load: The total load of all persons,
equipment, tools, materials, transmitted loads, and other loads reasonably anticipated to be applied to a scaffold or
scaffold component at any one time.
Opening: A gap or void 30 inches (76 cm) or more high and 18 inches (48
cm) or more wide, in a wall or partition, through which employees can fall to a lower level.
Open sides and ends: The edges of a platform that are more
than 14 inches (36 cm) away horizontally from a sturdy, continuous, vertical surface (such as a building wall) or a
sturdy, continuous horizontal surface (such as a floor), or a point of access. Exception: For plastering and lathing
operations the horizontal threshold distance is 18 inches (46 cm).
Overhand bricklaying: The process of laying bricks and
masonry units such that the surface of the wall to be jointed is on the opposite side of the wall from the mason,
requiring the mason to lean over the wall to complete the work. Related work includes mason tending and electrical
installation incorporated into the brick wall during the overhand bricklaying process.
Personal fall arrest system: A system used to stop an
employee in a fall from a working level. It consists of an anchorage, connectors, a body harness, and may include a
lanyard, deceleration device, lifeline, or suitable combinations of these. As of January 1, 1998, using a body belt for
fall arrest is prohibited.
Platform: A work surface elevated above lower levels. Platforms can be
constructed using individual wood planks, fabricated planks, fabricated decks, and fabricated platforms.
Positioning device system: A body belt or body harness
system rigged to allow an employee to be supported on an elevated vertical surface, such as a wall, and work with both
hands free while leaning.
Rated load: The manufacturer's specified maximum load to be lifted by
a hoist or to be applied to a scaffold or scaffold component.
Rope grab: A deceleration device which travels on a lifeline and
automatically, by friction, engages the lifeline and locks so as to arrest the fall of an employee. A rope grab usually
employs the principle of inertial locking, cam/level locking, or both.
Roof: The exterior surface on the top of a building. This does not include
floors or formwork which, because a building has not been completed, temporarily become the top surface of a building.
Roofing work: The hoisting, storage, application, and removal of
roofing materials and equipment, including related insulation, sheet metal, and vapor barrier work, but not including
the construction of the roof deck.
Safety-monitoring system: A safety system in which a
competent person is responsible for recognizing and warning employees of fall hazards.
Scaffold: Any temporary elevated platform (supported or suspended) and
its supporting structure (including points of anchorage), used for supporting employees or materials or both.
Self-retracting lifeline/lanyard: A deceleration
device containing a drum-wound line which can be slowly extracted from, or retracted onto, the drum under slight tension
during normal employee movement, and which, after onset of a fall, automatically locks the drum and arrests the fall.
Snaphook: A connector comprised of a hook-shaped member with a normally
closed keeper, or similar arrangement, which may be opened to permit the hook to receive an object and, when released,
automatically closes to retain the object. Snaphooks are generally one of two types: The locking type with a
self-closing, self-locking keeper which remains closed and locked until unlocked and pressed open for connection or
disconnection; or the non-locking type with a self-closing keeper which remains closed until pressed open for connection
or disconnection. As of January 1, 1998, the use of a non-locking snaphook as part of personal fall arrest systems and
positioning device systems is prohibited.
Stair tower (Scaffold stairway/tower): A tower comprised of scaffold
components and which contains internal stairway units and rest platforms. These towers are used to provide access to
scaffold platforms and other elevated points such as floors and roofs.
Steep roof: A roof having a slope greater than 4 in 12 (vertical to
Stilts: A pair of poles or similar supports with raised footrests, used to
permit walking above the ground or working surface.
Toeboard: A low protective barrier that will prevent the fall of
materials and equipment to lower levels and provide protection from falls for personnel.
Tubular welded-frame scaffold: See Fabricated
Unprotected sides and edges: Any side or edge (except
at entrances to points of access) of a walking/working surface, e.g., floor, roof, ramp, or runway, where there is no
wall or guardrail system at least 39 inches (1.0 m) high.
Unstable objects: Items whose strength, configuration, or lack
of stability may allow them to become dislocated and shift and therefore may not properly support the loads imposed on
them. Unstable objects do not constitute a safe base support for scaffolds, platforms, or employees. Examples include,
but are not limited to, barrels, boxes, loose bricks, and concrete blocks.
Walking/working surface: Any surface, whether horizontal
or vertical, on which an employee walks or works, including, but not limited to, floors, roofs, ramps, bridges, runways,
formwork, and concrete reinforcing steel, but not including ladders, vehicles, or trailers, on which employees must be
located in order to perform their job duties.
Walkway: A portion of a scaffold platform used only for access and not as
a work level.
Warning line system: A barrier erected on a roof to warn
employees that they are approaching an unprotected roof side or edge, and which designates an area in which roofing work
may take place without the use of guardrail, body belt, or safety net systems to protect employees in the area.
Chock: A wedge, block, or large stone placed against the tires of a vehicle
to prevent its moving, especially on an incline.
Formwork: The total system of support for freshly placed or partially
cured concrete, including the mold or sheeting (form) that is in contact with the concrete as well as all supporting
members including shores, reshores, hardware, braces, and related hardware.
Jacking operation: The task of lifting a slab (or group of
slabs vertically from one location to another (e.g., from the casting location to a temporary (parked) location, or to
its final location in the structure), during the construction of a building/structure where the lift-slab process is
Lift slab: A method of concrete construction in which floor and roof
slabs are cast on or at ground level and lifted into position using jacks.
Limited access zone: An area alongside a masonry wall that is
under construction and clearly demarcated to limit access by employees.
Pre-cast concrete: Concrete members (such as walls, panels,
slabs, columns, and beams) which have been formed, cast, and cured before final placement in a structure.
Reshoring: The construction operation in which shoring equipment (also
called reshores or reshoring equipment) is placed, as the original forms and shores are removed, to support partially
cured concrete and construction loads.
Rollover protective structure (ROPS): Vehicle structures such as
roll-bars, frames, roll-protective cabs etc., designed to prevent the vehicle operator from being crushed as a result of
Seatbelt: A device, usually worn around the waist, consisting of a
strap or straps anchored to a vehicle so as to hold a person in his seat.
Shore: A supporting member that resists a compressive force imposed by a
load; or the operation by which a supporting member is placed.
Vertical slip forms: Forms that are jacked vertically during
the placement of concrete.
TRENCHING AND EXCAVATION
Bell-bottom pier hole: A type of shaft or footing
excavation, the bottom of which is made larger than the cross section above to form a belled shape.
Benching (Benching system): A method of protecting
employees from cave-ins by excavating the sides of an excavation to form one or a series of horizontal levels or steps,
usually with vertical or near-vertical surfaces between levels.
Cave-in: The separation of a mass of soil or rock material from the side
of an excavation, or the loss of soil from under a trench shield or support system, and its sudden movement into the
excavation, either by falling or sliding, in sufficient quantity so that it could entrap, bury, or otherwise injure and
immobilize a person.
Cross braces: The horizontal members of a shoring system installed perpendicular to the sides
of the excavation, the ends of which bear against either uprights or wales.
Excavation: Any man-made cut, cavity, trench, or depression in an
earth surface formed by earth removal.
Faces: The vertical or inclined earth surfaces formed as a result of
Failure: The breakage, displacement, or permanent deformation of a structural member or
connection so as to reduce its structural integrity and its supportive capabilities.
Hazardous atmosphere: An atmosphere which by reason of being
explosive, flammable, poisonous, corrosive, oxidizing, irritating, oxygen deficient, toxic, or otherwise harmful, may
cause death, illness, or injury.
Protective system: A method of protecting employees from
cave-ins, from material that could fall or roll from an excavation face or into an excavation, or from the collapse of
adjacent structures. Protective systems include support systems, sloping and benching systems, shield systems, and other
systems that provide the necessary protection.
Ramp: An inclined walking or working surface that is used to gain access to
one point from another, and is constructed from earth or from structural materials such as steel or wood.
Registered Professional Engineer: A person who
is registered as a professional engineer in the state where the work is to be performed. However, a professional
engineer registered in any state is deemed to be a "registered professional engineer" within the meaning of
this standard when approving designs for "manufactured protective systems" or "tabulated data" to be
used in interstate commerce.
Sheeting: The members of a shoring system that retain the earth in
position and in turn are supported by other members of the shoring system.
Shield (Shield system): A structure that is able to withstand the forces
imposed on it by a cave-in and thereby protect employees within the structure. Shields can be permanent structures or
can be designed to be portable and moved along as work progresses. Additionally, shields can be either pre-manufactured
or job-built in accordance with 29 CFR 1926.652(c)(3) or 29 CFR 1926.652(c)(4). Shields used in trenches are usually referred to as
"trench boxes" or "trench shields."
Shoring (Shoring system): A structure such as a metal hydraulic,
mechanical, or timber shoring system that supports the sides of an excavation and which is designed to prevent cave-ins.
Sides: See Faces.
Sloping (Sloping system): A method of protecting employees from cave-ins
by excavating to form sides of an excavation that are inclined away from the excavation so as to prevent cave-ins. The
angle of incline required to prevent a cave-in varies with differences in such factors as the soil type, environmental
conditions of exposure, and application of surcharge loads.
Spoil: The dirt, rocks, and other materials removed from an excavation and
either temporarily or permanently put aside.
Stable rock: Natural solid mineral material that can be excavated
with vertical sides and will remain intact while exposed. Unstable rock is considered to be stable when the rock
material on the side or sides of the excavation is secured against caving-in or movement by rock bolts or by another
protective system that has been designed by a registered professional engineer.
Structural ramp: A ramp built of steel or wood, usually used for
vehicle access. Ramps made of soil or rock are not considered structural ramps.
Support system: A structure such as underpinning, bracing, or
shoring, that provides support to an adjacent structure, underground installation, or the sides of an excavation.
Tabulated data: Tables and charts approved by a registered
professional engineer and used to design and construct a protective system.
Trench (Trench excavation): A narrow excavation (in relation to its
length) made below the surface of the ground. In general, the depth is greater than the width, but the width of a trench
(measured at the bottom) is not greater than 15 feet (4.6 m).
Trench box: See Shield (Shield system).
Trench shield: See Shield (Shield system).
Uprights: The vertical members of a trench shoring system placed in
contact with the earth and usually positioned so that individual members do not contact each other.
Wales: Horizontal members of a shoring system placed parallel to the
excavation face whose sides bear against the vertical members of the shoring system or earth.