NCCCO LBT flashcards

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

Load Moment

The product of the load weight and its horizontal distance from the crane's tipping axis or center of rotation. It determines stability and is compared against the crane's rated load moment.

Net Capacity

The gross rated capacity shown on the load chart minus the weight of all lifting attachments such as the hook block, slings, shackles, and any jib or auxiliary equipment installed.

Working Radius

The horizontal distance from the crane's center of rotation to the center of gravity of the suspended load, measured with the boom at its actual operating angle and extension.

Critical Lift

A lift meeting defined thresholds such as exceeding 75% of chart capacity, using multiple cranes, lifting personnel, or operating over occupied areas; requires an engineered plan and lift director.

Ground Bearing Pressure

The force per unit area exerted by an outrigger or crawler onto the supporting soil, calculated as total load divided by the effective bearing area of the float or mat.

Boom Deduction

The weight subtracted from the main boom chart when a jib or auxiliary boom is installed; the deduction value comes from the manufacturer's specific chart for that configuration.

Two-Crane Lift Plan

A written, engineered procedure for tandem picks specifying load share per crane, rigging arrangement, communication, and keeping each crane under a conservative percentage of capacity.

Load Chart Selection

Choose the chart matching the actual boom length, counterweight, outrigger configuration, and jib state; using the wrong chart produces an incorrect rated capacity and unsafe lift.

Power Line Clearance Table

OSHA 1926.1408 Table A minimum approach distances: 20 feet for lines up to 50 kV, and 20 feet plus 0.4 inches per kV above 50 kV.

Outrigger Float Area

The contact area of the outrigger float or pad; blocking must equal or exceed this area so the calculated bearing pressure is not exceeded by the cribbing.

Swing Radius Barricade

A physical barrier enclosing the area swept by the crane's counterweight and rotating superstructure, keeping personnel clear of the crushing hazard during any swing motion.

Ground Slope Limit

The maximum out-of-level condition permitted by the manufacturer, typically around one percent; exceeding it invalidates the load chart and increases tipping risk.

In-Service Wind Limit

The maximum wind speed at which the crane may handle a load, specified by the manufacturer; higher sail area loads require derating or stopping the lift.

Underground Utility Survey

A pre-lift check for buried pipes, conduits, and voids beneath outrigger locations; undocumented voids can collapse under load and cause the crane to tip.

Fall Zone

The area beneath and around the suspended load where personnel could be struck if the load or rigging fails; it must be barricaded and kept clear of all workers.

Crane Mat

A structural pad placed under outrigger floats to spread load over a larger soil area, reducing bearing pressure to within the soil's allowable capacity.

Stop Signal Authority

Any person may give the stop hand signal, and the operator must obey it immediately regardless of who is designated to direct the lift.

Designated Signal Person

The single qualified individual who directs the operator during a lift; only one person gives signals at a time to prevent conflicting commands.

Test Lift

Raising the load a few inches to verify rigging security, brake holding ability, load balance, and crane stability before hoisting to working height.

Tag Line Use

A rope attached to the load to control rotation and sway; workers hold it clear of the body and never wrap it around hands or arms.

Suspended Load Rule

The operator may not leave the controls while a load is suspended; if an emergency occurs, the load must be lowered and secured before leaving.

Pre-Lift Meeting

A briefing before the lift covering the lift plan, roles, signals, tag lines, communication, and emergency procedures; attendance is documented.

Hand Signal Standard

Standard crane hand signals are defined in ASME B30.5 and adopted by OSHA 1926 Subpart CC; nonstandard signals require a documented, agreed-upon alternative.

Lift Director

The person with overall responsibility for the lift, ensuring the plan is followed, personnel are qualified, and conditions remain within plan limits during execution.

Load Control During Swing

Start and stop swing smoothly, keep the load low, and use tag lines to prevent pendulum swing; sudden stops increase load moment and can tip the crane.

OSHA Subpart CC

29 CFR 1926 Subpart CC regulates cranes and derricks in construction, covering operator certification, inspections, power line clearance, and signal person qualification.

ASME B30.5 Scope

The ASME standard covering mobile and locomotive cranes, including load charts, inspection, operation, and maintenance requirements referenced by OSHA.

Annual Crane Inspection

A comprehensive inspection by a qualified person at least every twelve months, documented and retained; more frequent inspections apply to severe service conditions.

Daily Pre-Shift Inspection

A documented inspection by a competent person before each shift covering controls, brakes, wire rope, hooks, limit devices, and hydraulic systems; deficiencies must be corrected before use.

Operator Certification Requirement

OSHA 1926.1427 requires crane operators to hold a nationally accredited certification such as NCCCO and to be qualified and evaluated by the employer.

Sling Removal Criteria

Slings must be removed from service for broken wires, kinks, bird-caging, excessive wear, missing identification tags, or damage exceeding the standard's limits.

Load Chart Availability

The manufacturer's load chart for the specific crane configuration must be available in the cab or to the operator at all times during operation.