Definitions 5
3
DEFINITIONS
BOOM LENGTH: The straight line through the centerline of boom pivot pin to the centerline of the
boom point load hoist sheave pin, measured along the longitudinal axis of the boom. (Indicator 2%)
BOOM ANGLE: The angle between the longitudinal centerline of the boom base section and the
horizontal plane. (Indicator 65° to 90° boom angle + 0°/2°; less than 65° boom angle + 0°/-3°)
RADIUS OF LOAD The horizontal distance from a vertical projection of the crane‟s axis of rotation to
the supporting surface, before loading, to the center of the vertical hoist line or tackle with rated load
applied. (Indicator 100% to 110%)
RATED LOAD The load value shown on the applicable load-rating chart of the crane for the particular
crane configuration, boom length, boom angle, or functions or these variables. For radii outside those
shown on the load-rating chart, the rated load is to be considered as zero.
ACTUAL LOAD The weight of the load being lifted and all additional equipment such as blocks,
slings, sensors, etc. Also referred to as working load. (Indicator 100% to 110%)
CRANE CONFIGURATION The physical arrangement of the crane which is prepared for a particular
operation in conformance with the manufacturer‟s operating instructions and load rating chart.
TWO-BLOCKING Contact of the lower load block or hook with the upper load block, boom point, or
boom point machinery.
ANALOG: Electrical signals that vary in proportion to the quantities they represent. (Boom length,
angle, and pressure transducer)
DIGITAL: Electrical signals of an on-and-off state (two different voltage levels) to represent some
quantity of operation. (A2B, area definition switch)
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