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aerial platform – a mobile device that has an adjustable position platform,
supported from ground level by a structure.
ambient temperature – the air temperature of the immediate environ-
ment.
authorized personnel – personnel approved as assigned to perform specific
duties at a specific location.
base – the relevant contact points of the aerial platform that form the stability
support (e.g. wheels, casters, outriggers, stabilizers).
boom – a movable cantilever beam which supports the platform.
center of gravity – the point in the aerial platform around which its weight
is evenly balanced.
chassis – the integral part of the aerial platform that provides mobility and
support for the booms.
fall protection – a system to protect against falls that may include either a
fall restraint or personal fall arrest system as required by national or local
regulations and standards.
fall restraint – a system that is used while working on a boom lift within the
boundaries of platform guardrails to provide restraint from being projected
upward from the platform. This system includes a harness or belt, lanyard,
and a lanyard anchor. Federal OSHA, ANSI, and Snorkel require the use of
additional fall protection beyond the platform guardrails on boom supported
aerial platforms.
floor or ground pressure – the maximum pressure, expressed in pounds
per square inch, a single wheel concentrates on the floor or ground.
gradeability – the maximum slope that the aerial platform is capable of
travel.
ground fault circuit interrupter (GFCI) – a fast-acting circuit breaker that
opens to stop electrical circuit flow if it senses a very small current leakage
to ground. The GFCI is used to protect personnel against a potential shock
hazard from defective electrical tools or wiring.
guardrail system – a vertical barrier around the platform to prevent per-
sonnel from falling.
hazardous location – any location that contains, or has the potential to
contain, an explosive or flammable atmosphere as defined by ANSI/NFPA
505.
jib – an articulating boom attached to the tip boom which increases the
overall boom reach.
level sensor – a device that detects a preset degree of variation from perfect
level. The level sensor is used to sound an alarm if operating on a slope
greater than the preset value.
lower controls – the controls located at ground level for operating some or
all of the functions of the aerial platform.
main boom – a boom assembly located between the turntable and the jib.
manufacturer – a person or entity who makes, builds or produces an
aerial platform.
maximum travel height – the maximum platform height or the most adverse
configuration(s) with respect to stability in which travel is permitted by the
manufacturer.
460SJ – 1433685
Appendix A – Glossary
maximum wheel load – the load or weight that can be transmitted through
a single wheel to the floor or ground.
Minimum Safe Approach Distance – the minimum safe distance that
electrical conductors may be approached when using the aerial platform.
Also called M.S.A.D.
operation – the performance of any aerial platform functions within the scope
of its specifications and in accordance with the manufacturer's instructions,
the users work rules, and all applicable governmental regulations.
operator – a qualified person who controls the movement of an aerial
platform.
personal fall arrest system – a fall protection system that is used while
working on an unprotected edge (such as a roof top with no guardrail). This
system includes a harness, lanyard or other connecting device, a fall arrestor,
an energy absorber or decelerator, an anchorage connector, and a secure
anchorage such as a building beam, girders or columns. An aerial platform
is not a fall arrest anchorage.
platform – the portion of an aerial platform intended to be occupied by
personnel with their tools and materials.
platform height – the vertical distance measured from the floor of the plat-
form to the surface upon which the chassis is being supported.
prestart inspection – a required safety inspection routine that is performed
daily before operating the aerial platform.
qualified person – a person, who by reason of knowledge, experience,
or training is familiar with the operation to be performed and the hazards
involved.
rated load capacity – the designed carrying capacity of the aerial platform
as specified by the manufacturer.
Snorkel Guard – a mechanically activated guarding system with a
spring-loaded rail mounted above the upper control panel. Pushing against
the rail activates the system, disabling the machine functions to stop upward
movement of the platform.
stow – to place a component, such as the platform, in its rest position.
tip boom – a telescopic boom section that extends and retracts from within
the main boom. The tip boom is nearest the platform.
turning radius – the radius of the circle created by the wheel during a 360°
turn with the steering wheels turned to maximum. Inside turning radius is the
wheel closest to the center and outside turning radius is the wheel farthest
from the center.
turntable – the structure above the rotation bearing which supports the
booms. The turntable rotates about the centerline of rotation.
unrestricted rated load capacity – the maximum designed carrying
capacity of the aerial platform allowed by the manufacturer in all operating
configurations.
upper controls – the controls located on or beside the platform used for
operating some or all of the functions of the aerial platform.
wheelbase – the distance from the center of the rear wheel to the center
of the front wheel.
working envelope – the area defined by the horizontal and vertical limits
of boom travel that the platform may be positioned in.
working height – platform height plus six feet.
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