A crane is a mechanical lifting device equipped with a winder, wire ropes and sheaves that can be used both to lift and lower materials and to move them horizontally. It uses one or more simple machines to create mechanical advantage and thus move loads beyond the normal capability of a human. Cranes are commonly employed in the transport industry for the loading and unloading of freight, in the construction industry for the movement of materials, and in the manufacturing industry for the assembling of heavy equipment.
(See Figure 1). Any overhead wire shall be considered to be an energized line unless and until the owner of the line or the electrical utility authorities indicate that it is not an energized line. Do not rely on the coverings of wires for protection. Crane activities shall be conducted so that no part of the crane, load line or load becomes a conductive path. Cranes shall not be used to perform any lifting operations under power lines if any combination of boom, load, load line, or machine component has the capability of entering the prohibited zone or if the requirements of Crane Operations Within the Prohibited Zone and the Power Lines are Energized have not been met. Cranes should not be used to handle loads over power lines. The following four conditions must be considered when operating a Mobile Crane near electric power lines:
Required Notification Before Work.A minimum of 48 hours before commencement of operations near electric power lines, notify the electrical utility for an onsite meeting to establish conditions to safely complete the operations. Prior to the beginning the work activity, notify electrical utilities in person or by phone, the day the work activity will take place to re-establish the location, equipment and working conditions.
Crane Operation Near De-energized and Grounded Electric Power Lines.This describes the preferred condition under which the operation can be performed safely. The hazard of injury or death due to electrocution has been removed. The following steps shall be taken to ensure that de-energization of the power lines has occurred:
Figure 1. Operating Cranes Near Electrical Power Lines Not Within a Boom Length of Prohibited Zone. (Crane does not have the capacity to boom down, swing or extend into the prohibited zone.)
A qualified representative of the owner of the lines or a designated representative of the electrical utility shall be on site to verify that the steps above have been completed and that the lines are not energized.
If cage-type boom guards, insulating links, or other proximity warning devices are used on cranes, such devices shall not be used as a substitute for requirements of Operating Cranes Near Energized Transmitters or Electric Power Lines. If such devices are used, due to the lethal nature of electrical hazards and to lessen the potential of false security, the crane operator, crew, and load handling personnel shall receive instructions and have an understanding of:
Power Lines Energized, Crane Operating Within the Erected/Fully Extended Boom Length of the Prohibited Zone (Crane has the capacity to boom down, swing or extend into the prohibited zone. See Figure 2.)
Figure 2. Danger Zone for Cranes and Lifted Loads Operating Near Electrical Power Lines Within Boom Length of Prohibited Zone. (Crane has the capacity to boom down, swing or extend into the prohibited zone.)
Table 1. Safe Working Distance from Power Linesa. When operating near high-voltage power lines
Normal voltage (phase to phase)
Minimum Required Clearance
Up to 50 kV
10 ft (3.1 m)
b. While in transit with no boom and load or mast lowered
Normal voltage (phase to phase)
Minimum Required Clearance
Up to 0.75 kV
4 ft (1.2 m)
Figure 3. Minimum Radial Distance of Prohibited Zone for Cranes Operating Near Electrical Lines
Crane Operations Within the Prohibited Zone and the Power Lines are Energized
Before such operations take place, a qualified person responsible for crane operations and a qualified representative of the utility or an engineer qualified in power line transmission, after visiting the site together, shall determine whether operating the crane within the Prohibited Zone is the most feasible way to complete the job. Both persons shall set minimum required clearances and procedures for safe operations. These operations shall be under their supervision.
Before crane operations within the Prohibited Zone, the following may be required:
Load control, when required, shall utilize tag lines of a nonconductive type. (A recommended choice for a nonconductive tag line is dry rope made of polypropylene or polyethylene fiber.)
A qualified signaler, whose sole responsibility is to verify that the established clearances are maintained, shall be in constant contact with the crane operator.
The person responsible for the operation shall alert and warn the crane operator and all persons working around or near the crane about hazard of electrocution or serious injury and instruct those persons on how to avoid the hazard.
All non-essential personnel shall be removed from the crane work area.
No one shall be permitted to touch the crane or the load unless the signaler indicates it is safe to do so.
If cage-type boom guards, insulating links, or other proximity warning devices are used on cranes, such devices shall not be used as a substitute for requirements of Operating Cranes Near Energized Transmitters or Electric Power Lines. If such devices are used, due to the lethal nature of electrical hazards and to lessen the potential of false security, the crane operator, crew, and load handling personnel shall receive instructions and have an understanding of the following:
Perform the following tasks:
Hoisting and Rigging Bulletin May 29, 2003 Mobile Cranes and Energized Power Lines
Overhead electrical power lines are a serious electrocution hazard to mobile crane operators. This bulletin provides supplemental information on how to avoid serious injury in the event of accidental contact between mobile crane equipment and an energized overhead power line. Refer to Operating Cranes Near Energized Transmitters or Electric Power Lines in this PNNL Hoisting and Rigging Manual for specific safe practices and work planning requirements related to operating mobile cranes near energized transmitters or electrical power lines.
In the Event of a Power Line Contact or Arcing: Power line disturbances involving mobile cranes have the potential to result in serious injury. Generally, those at greatest risk are the riggers or other workers standing near the crane structure, accounting for approximately 70% of the injuries and deaths that occur. Operators are injured less frequently because of the physics of electricity and crane equipment design. If an event occurs, no current will flow through the operator as long as he/she stays on the crane. (With the operator on the crane, both the crane and the operator have the same voltage potential.)
If a line is contacted or arcing occurs as a result of inadequate clearance, the operator should move the unit away from the danger while carefully trying to disconnect from the line to remove any contact (if applicable). Movement away from the zone should be in the reverse direction and should continue until the arc breaks. An adequate distance is at least an additional 10 feet, with the actual distance depending on the electrical power line area of influence; for higher voltages greater distances are needed.
Backing away needs to be done cautiously because the power line may have "tack welded" to the crane component or load during contact. If contact with the energized line cannot be broken, the operator should STOP. The operator should wait in the crane cab and all other workers should stay away from the crane, ropes, and load, which, in addition to the ground surface, will be "hot." Electrical Utilities should be contacted to de-energize the line and confirm a safe condition before the operator attempts to leave the cab or other ground personnel approach the scene. ONLY UNDER EXTREME CIRCUMSTANCES (e.g., fire) should the operator leave the cab while the power line is still energized.
Should the line break and drop onto the crane, the operator needs to stop the crane, stay seated, shut off the engine and have Electrical Utilities immediately notified to respond. No movement of the crane shall occur until Electrical Utilities provides express authorization.
Emergency Crane Cab Evacuation: If the operator must leave the equipment, he or she should keep both feet together and jump clear from the equipment, maintain balance, and land with both feet still together. The operator’s hands should not touch any part of the crane equipment during the jump. Care must be taken not to touch any part of the crane and the ground at the same time. The operator must then shuffle his/her feet slowly and in very small steps or bunny hop away from the crane and the affected area. After a power line contact, the electrical current flows outward from the crane through the soil in a ripple pattern.
Areas of high and low potential circle the energized equipment like ripples in a pond after a stone hits the surface. If a person steps from an area of high potential to an area of low potential, electricity can flow through the person’s legs causing injury or death. The difference in potential when one foot is in a high-voltage area and the other foot is in a low-voltage area will cause electricity to pass through the body. The current flowing through the ground also is why other workers in the area must stay at least 10 feet away from the energized equipment.
Signals and Instructions
Standard Signals. Standard hand signals are shown in Hand Signals. In situations where hand signals are not effective, use voice communication equipment (radio or hard wired). When using radio, it is important to have channels devoted exclusively to crane communications. Signals shall be discernible or audible.
Special Signals. For operations not covered by standard hand signals or for special operations, additions to or modifications of the standard signals may be required. In such cases, the special signals shall be agreed upon in advance by both the operator and the signal person, and should not conflict with standard signals.
Audible Travel Signals. When moving the vehicle, use the following signals:
Instructions. If it is desired to give instructions to the operator, other than those provided by the established signal system, the crane motions shall be stopped until instructions are given to and understood by the operator.
Fire Extinguisher. A portable fire extinguisher, with a minimum extinguisher rating of 10 BC, shall be installed in the cab or at the machinery housing. Operating and maintenance personnel shall be familiar with the use and care of the fire extinguisher. Maintain fire extinguishers in a serviceable condition.
Refueling. Engines shall be stopped before refueling, and smoking or open flames within 50 feet (15.2 meters) of the refueling area are prohibited. Portable containers for refueling with gasoline shall be safety-type cans equipped with an automatic closing cap and a flame arrester.
A durable, legible rating chart(s) from the manufacturer shall be provided in the cab of each crane. If the original chart(s) becomes illegible, a new chart(s) shall be obtained only from the crane manufacturer or designee. The crane’s serial number should be printed or stamped on the chart by the manufacturer or designee. The custodian shall ensure that the proper load chart(s) are available in the cab. The rating chart(s) shall be in a location accessible to the operator while the operator is at the controls.
Rating Chart Contents
The rating chart(s) shall include a full and complete range of manufacturer's crane load ratings at all stated operating radii, boom angles, work areas, and all stated boom lengths and configurations, jib lengths and angles (or offset). Also included shall be alternative ratings for use and nonuse of optional equipment on the crane, such as outriggers and extra counterweight, which affect ratings. Where ratings are limited by structural, hydraulic, or factors other than stability, the limitations shall be shown and emphasized on the rating charts.
Work Area Chart
The manufacturer should and normally will provide a work area chart(s) showing the limiting position of any load within areas indicated (e.g., over side, over rear, over front). Work area configurations deviating from ASME B30.5, Figure 11, shall be defined by diagrams supplied by the crane manufacturer.
An operating manual, supplied by the manufacturer, shall be readily available to the operator at all times.
Field Assembly, Disassembly, and Maintenance Information
The manufacturer shall furnish field assembly, disassembly, and maintenance information. (See Lattice Boom Dismantling/Assembly.)
For wire rope requirements, see Wire Rope.
Any new poured socket or swaged socket assembly used as a boom pendent shall be proof tested to the crane or fitting manufacturer’s recommendations, but in no case greater than 50% of the component wire rope’s or structural strand’s nominal strength.
Wire rope clips shall be drop-forged steel of the single- or double-saddle type. Wire rope clips used in conjunction with wedge sockets shall be attached to the unloaded dead end of the rope only (see Figure 4). Eye splices shall be made in a manner recommended by the rope or crane manufacturer, and rope thimbles should be used in the eye.
Figure 4. Typical Wedge Sockets.
Notes: (a) It is important that wedge socket assemblies consist of a wedge and a socket, matched pair of the correct size, and from the same manufacturer. (b) Crosby® Group, Inc., now manufactures a patented wedge socket assembly that clips the rope to the wedge. This product may be found on new cranes and is suitable as a replacement part on existing cranes.
Tighten wire rope clips evenly to the recommended torque. Rope clip nuts should be periodically checked and tightened as necessary to compensate for any decrease in rope diameter during usage. Swaged, compressed, or wedge-socket fittings shall be applied as recommended by the rope, crane, or fitting manufacturer.
Sheave Grooves. Sheave grooves shall be smooth and free from surface defects that could cause rope damage. The cross-sectional radius at the bottom of the groove shall form a close-fitting saddle for the size of rope used.
Sheave Close-Fitting Guards. Sheaves carrying ropes, which can be momentarily unloaded, shall be provided with close-fitting guards or other devices to guide the rope back into the groove when the load is reapplied. The sheaves in the lower load block shall be equipped with close-fitting guards that will prevent ropes from becoming fouled when the block is lying on the ground with loose ropes.
Load Hook, Ball Assemblies, and Load Blocks
Load hooks, ball assemblies, and load blocks shall be of sufficient weight to overhaul the line from the highest hook position. Hook and ball assemblies and load blocks shall be labeled with their rated capacity and weight.
Hook Mousing and Throat Latches. Latch equipped hooks shall be used for hoisting and rigging operations unless the application makes use of the latch impractical or unsafe. The absence of a hook throat latch is not indiscriminately allowed. (See Hooks, specifically the section on Throat Latches.)
Booms and Jibs
Jib Restraint. Jibs shall be restrained from backward overturning. Cable-type belly slings are not acceptable for restraints.
Boom-Angle Indicator. A boom-angle indicator, readable from the operator’s station, shall be provided.
Boom-Length Indicator. A boom length indicator, readable from the operator’s station, shall be provided for telescoping booms unless the load rating is independent of the boom length.
Boom-Hoist Stop. A boom-hoist disconnect, shutoff, or hydraulic relief shall be provided to automatically stop the boom hoist when the boom reaches a predetermined high angle.
Boom and Jib Identification. Booms, boom sections, and jibs shall be clearly identified as to the crane(s) they are assigned.
Miscellaneous Equipment Requirements
Telescopic boom cranes manufactured after February 28, 1992, shall be equipped with an anti-two-block device or a two-block damage prevention feature for all points of two-blocking. Telescopic boom cranes manufactured before February 28, 1992, should be equipped with a two-block warning feature(s), a two-block damage prevention feature, or an anti-two-block device for all points of two-blocking (i.e., jibs, boom extensions, etc.).
Lattice boom cranes manufactured after February 28, 1992, shall be equipped with a two-block warning feature which functions for all points of two-blocking. Lattice boom cranes manufactured before February 28, 1992, should be equipped with a two-block warning feature which functions for all points of two-blocking.
Cranes used to lift suspended personnel platforms shall have an anti two-block device or a two-block damage prevention feature. A two-block warning feature and/or assigning a person to watch for, and guard against, two-blocking provides insufficient safety for personnel lifting and is not allowed.
Load Indicators. Cranes built after November 19, 1993, with a maximum load capacity of 3 tons or more should have load indicators.
Horn or Signal Device. An audible horn or signal device shall be provided. The control for the device shall be within reach of the operator.
Crane Levelness Indicator. Means shall be provided for the operator to visually determine the levelness of the crane.
Electrocution Hazards Warning Signs. Durable signs shall be installed, visible from the operator’s station, warning that electrocution or serious bodily injury may occur unless a minimum clearance of 10 feet (3 meters) is maintained between the crane or the load being handled and energized power lines up to 50 kV, and that greater clearances are required because of higher voltages. Refer to Table 1 and Figure 3.
Hand Signal Posting. It is required to conspicuously post at the job site figures demonstrating standard hand signals for controlling mobile cranes. Posting outside on the crane cab meets this requirement.
Posting hand signal charts outside on the crane cab is recommended and will meet the requirement to post hand signals conspicuously at the job site (see Special Signals).
Aviation Safety - High Boom. Within 3.5 miles (3 nautical miles) of an airport, crane booms configured 200 feet or more above ground level must have the prior approval of the DOE-RL Aviation Safety Officer. (See 14 CFR 77, Federal Aviation Administration.)
Seat Belt. If a seat belt is provided with a wheel-mounted, single-control station crane, it shall be used during transit and travel.
Equipment deficiencies found during operation or inspection that affect safety shall be resolved before
continued operation of the crane. Inspection requirements shall be derived from information provided by
the crane manufacturer. Unless there is a valid justification to do otherwise, the manufacturer’s
recommendations shall be followed. Inspection procedures shall be for the applicable make and model of crane.
Inspection requirements shall be derived from information provided by the crane manufacturer. Unless there is a valid justification to do otherwise, the manufacturer’s recommendations shall be followed. Inspection procedures shall be for the applicable make and model of crane.
Before initial use, new and altered cranes shall be inspected by a qualified inspector to ensure compliance with requirements contained in the following documents:
Frequent inspections shall be performed by the operator or an appointed person.
Frequent Inspection Procedure. The frequent inspection procedure shall be available to the operator. The frequent inspection procedure or an attachment thereto, shall state how deficiencies found during frequent inspection shall be reported.
Note:Frequent inspection procedures may be supplied by the manufacturer.
Frequent Inspection Steps. The following steps should be included in the frequent inspection procedure.
Recommended Daily, when used:
Perform other monthly inspections as recommended by the manufacturer. (Specific monthly inspections shall be documented [see Monthly Documented Inspections]).
Monthly Documented Inspections
Critical items in use such as brakes, crane hooks, ropes, hydraulic and pneumatic cylinders, and hydraulic and pneumatic relief pressure valves, shall be inspected monthly. See Hooks for hook inspection requirements and Wire Ropes for wire rope inspection requirements. Inspection records are required.
Operator Aids (Operator Aids are also called Crane Safety Accessories)
Operator aids including load indicating, anti-two-block, two-block warning, and two-block damage prevention systems shall be checked and inspected as follows:
Periodic Inspection Frequency.Complete, documented inspections shall be performed monthly to no less than annually, depending upon crane activity, severity of service, and environment. Periodic inspection shall include the requirements of the frequent inspection and, in addition, items such as the following:
Periodic inspections as recommended by the manufacturer.
Inspection of Cranes Not in Regular Use
A crane that has been idle for a period of more than 1 month, but less than 6 months, shall be given a complete frequent inspection and a documented inspection of hooks, wire ropes, running ropes, and standing ropes before returning to service. A crane that has been idle for a period of at least 6 months shall be given a complete periodic inspection and a periodic documented inspection of hooks, wire ropes, load lines, and standing lines.
Standby cranes shall be inspected at least semiannually in accordance with the requirements of a frequent inspection. Inspection of running and standing wire ropes shall be completed at least semiannually. Standby cranes that are exposed to adverse environmental conditions should be inspected more frequently.
Before Returning to Lift Service After Excavation or Demolition Work
Cranes used for excavation or demolition work shall be thoroughly inspected by a qualified inspector(s) before returning the crane to lift service. This inspection shall be documented and be at least equal to a periodic inspection with additional emphasis on equipment components susceptible to damage while the crane was in excavation or demolition service. Wire rope shall also be inspected before returning the crane to lift service (see Wire Rope).
Required inspection records shall include the date of inspection, the signature of the person who performed the inspection and the serial number, or other identifier, of the crane that was inspected. Records (inspection and test reports) shall be retained in the crane maintenance file.
Frequent Inspection. Frequent inspection records are not required. It is recommended that a checklist, initialed by the operator, be used to record the completion of frequent inspections.
Monthly Inspection of Critical Items. Inspection records are required for monthly inspection of critical items such as brakes, hooks, ropes (load lines), hydraulic cylinders, and hydraulic and pneumatic pressure valves.
Inspection and Testing of Operator Aids. Except for before-use inspections, records documenting inspections and tests of operator aids are required. Operator aid systems shall be inspected and tested by a qualified person every 12 months, or more frequently if specified by the manufacturer.
Periodic Inspection. Periodic inspection records are required.
Inspection Before Returning to Lift Service. When a crane returns to lift service, inspection records are required.
Standby Crane Inspection Reports. Standby crane inspection records are required.
Hook Non-Destructive Examination (NDE) Reports. If hooks receive NDE, NDE inspection records are required.
A preventive maintenance program based on the crane manufacturer’s recommendations shall be established. Dated records shall be made available.
Replacement parts should be obtained from the original equipment manufacturer.
Before adjustments and repairs are started, the following precautions shall be taken as applicable:
Place "Warning" or "Out of Order" signs on the crane controls. Signs or flags shall be removed only by authorized personnel.
After adjustments and repairs have been made, the crane shall not be returned to service until all guards have been reinstalled, trapped air removed from the hydraulic system, safety devices reactivated, and maintenance equipment removed.
Adjustments and Repairs
Any hazardous conditions disclosed by inspection or during operation shall be corrected before operation of the crane is resumed. Adjustments and repairs shall be done only by designated personnel.
Adjustments shall be maintained to ensure correct functioning of components. The following are examples:
Repairs or replacements shall be provided as needed for operation. The following are examples:
Replacement parts or repairs shall have at least the original design factor.
Instructions shall be provided by the manufacturer for the removal of air from hydraulic circuits.
Moving parts of the crane, for which lubrication is specified, shall be regularly lubricated. Lubricating systems should be checked for proper delivery of lubricant. Care shall be taken to follow the manufacturer’s recommendations as to the points and frequency of lubrication, maintenance of lubricant levels, and types of lubricant to be used.
Machinery shall be stationary while lubricants are being supplied and protection provided according to the Maintenance Procedure section above, unless equipped with for automatic or remote lubrication.
Each production crane shall be tested by the manufacturer to the extent necessary to ensure compliance with the operational requirements of ASME B30.5, Mobile and Locomotive Cranes. (See B30.5-2.2.1, Operational Tests.)
Where the complete production crane is not supplied by one manufacturer, such tests shall be conducted at final assembly.
Operational crane test results shall be made available by the manufacturer or final assembler.
Rated Load Test
Before initial use, cranes in which load-sustaining parts have been altered, replaced, or repaired should be load tested by, or under the direction of, a qualified person. Load testing of altered, repaired, or modified cranes may be limited to the functions affected by the alteration, repair, or modification, as determined by a qualified person. The replacement of rope (load lines or static lines) is specifically excluded from this load-testing requirement. However, a functional test of the crane under a normal operating load should be made before putting the crane back in service.
Where re-rating is necessary:
No cranes shall be re-rated in excess of the original load ratings unless such rating changes are approved by the crane manufacturer or a qualified person.
Test Load Accuracy
The weight of the test loads used on site must be accurately known within a tolerance of +0% to -5%, traceable to a recognized standard or verified by engineering calculations.
Note:The Crane Load Stability Test Code, SAE J765, describes a test on new cranes done by the crane manufacturer or the manufacturer’s testing agency. This code requires a test weight accuracy of ~1%.
The crane maintenance file is a compilation of various documents and records relating to operation, maintenance, inspection, testing, evaluating and repair of the equipment. The method(s) selected for establishing adequate information retention shall be determined by the equipment owner. It is expected that the maintenance files be retrievable within three work days. The equipment custodian is responsible for ensuring that a safe and reliable maintenance program is in place.
Intent of Crane Maintenance Files
The crane maintenance file shall contain, as a minimum, the required current dated periodic inspection records and other documentation to provide evidence of a safe and reliable maintenance program. Inspection records should be retained in a format and location that provides for ease in accessibility. Maintenance file information should provide a source for comparing present conditions with past conditions to determine whether existing conditions show a trending pattern of wear, deterioration, or other comparable factors that may compromise safe, continued use of the equipment. Length of record retention shall be determined by the equipment custodian’s established maintenance program.
Maintenance File Contents
Crane maintenance files shall contain the following documentation, as applicable, and should be retained for the life of the crane:
Previously Owned Cranes Maintenance Files
Although complete maintenance information for previously owned cranes may not be available, the equipment custodian shall acquire as much of the pertinent information as possible. If efforts fail to obtain the required information, the following actions, at a minimum, must take place:
If there is evidence of past repairs, replacement, or alterations of load-bearing parts and load test records are unavailable, a load test shall be performed in accordance with Rated Load Test, above.
Mobile Crane Types (1 of 3)
What should you check for before operating a crane?
What should you inspect a moving crane for?
Before lifting any load you should start the crane and inspect it when it is moving
What should you check for when inspecting a crane before maintenance?
What are some things to remember when repairing a crane?
How should you use a vertical hitch?
Doubled choker hitch
Double Wrap Choker Hitch
Double basket hitches
Double Wrap Basket Hitches
What should you know about using synthetic web slings?
What should you check when selecting slings?
What should you avoid when using slings?
What kinds of damage make a synthetic web-sling unusable?
When should you inspect chain slings?
How should you check chain slings during the periodical inspection?
A competent person should inspect chain slings periodically, according to the manufacturer's recommendations. For record keeping purposes it is useful if each chain has a metal tag with an identification number and load limit information. Change length, other characteristics and an inspection schedule should be recorded in a log book.
How should you use chain slings safely?
What should you avoid using chain slings?
How should you select the proper wire rope sling?
How should you use wire rope slings safely?
Center the sling load to prevent the load from shifting suddenly and causing a high impact load.
What should you avoid when using wire rope slings?
Who should inspect wire ropes and when?
When should you eliminate the rope from its use?
Assess the condition of the rope at the section showing the most wear. Discard a wire rope if you find any of the following conditions:
What can cause a wire rope break?
What are the types of shackles that you can choose?
How should you inspect shackles?
What should you avoid when using shackles?
How should you sling a load onto a crane hook?
What should you avoid when slinging a load?
How should you select the right bolt?
How should you use eye bolts safely?
What should you avoid when using eye bolts?
How should you inspect the body of a clamp?
What should you know about the spring, cam, lock and pads?
How should you use plate clamps safely?
What should you avoid when using plate clamps?
Follow ANSI Guidelines
Train workers to follow ANSI guidelines for operating cranes near overhead power lines (ANSI Standard B30.5-1994, 5-3.4.5)[ANSI 1994]. These guidelines recommend posting signs at the operator's station and on the outside of the crane warning that electrocution may occur if workers do not maintain safe minimum clearance that equals or exceeds OSHA requirements as follows:
Power line voltage Minimum safe
phase to phase (kV) clearance (feet)
50 or below 10
Above 50 to 200 15
Above 200 to 350 20
Above 350 to 500 25
Above 500 to 750 35
Above 750 to 1,000 45
|CRANE TERMS AND DEFINITIONS||MOBILE CRANES|
|Auxiliary Hoist||Lifting Principles|
|Axis of Rotation||Operational Considerations|
|Boom||INSPECTING A MOBILE CRANE|
|Boom Angle Indicator||Crane Inspection|
|Boom Stops||Crane Pre-inspection|
|Block Sheaves||Electrical Hazards|
|Deck||Inspection for cranes|
||Starting The Inspection|
|Headache Ball||Periodic Inspections|
|Holding Brake||Specific Inspection Items and References|
|Jib / Fly
||GENERAL load_charts AND OPERATIONAL CONSIDERATIONS|
|Load||General Crane Load Chart|
|Load Block||Crane Operational Consideration|
|Main Hoist||Construction Cranes OSHA 1926.550|
|Mechanical Load Brake||OSHA1926.550 (a)|
|Superstructure||Hoisting And Rigging OSHA 1926.753|
|Test Load||OSHA 1926.753 (a)|
|Two-Block||OSHA 1926.753 (b)|
|Quadrant of Operation||OSHA 1926.753 (c)|
|OSHA 1926.753 (d)|
|OSHA 1926.753 (e)|
|Suspended Personnel Platform|
Crane Certification & Training School