AN AMERICAN NATIONAL STANDARD SAFETY STANDARD FOR CABLEWAYS, CRANES, DERRICKS, HOISTS, HOOKS, JACKS, AND SLINGS ASME B30.5a-2002 ADDENDA to ASME B30.5-2000 MOBILE AND LOCOMOTIVE CRANES THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS Three Park Avenue New York, NY 10016 CCOOPPYYRRIIGGHHTT AAmmeerriiccaann SSoocciieettyy ooff MMeecchhaanniiccaall EEnnggiinneeeerrss LLiicceennsseedd bbyy IInnffoorrmmaattiioonn HHaannddlliinngg SSeerrvviicceess Date of Issuance: March 29, 2002 ASME is the registered trademark of The American Society of Mechanical Engineers. This code or standard was developed under procedures accredited as meeting the criteria for American National Standards. The Standards Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate. 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ASME accepts responsibility for only those interpretations of this document issued in accordance with the established ASME procedures and policies, which precludes the issuance of interpretations by individuals. No part of this document may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. The American Society of Mechanical Engineers Three Park Avenue, New York, NY 10016-5990 Copyright O 2002 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in U.S.A. CCOOPPYYRRIIGGHHTT AAmmeerriiccaann SSoocciieettyy ooff MMeecchhaanniiccaall EEnnggiinneeeerrss LLiicceennsseedd bbyy IInnffoorrmmaattiioonn HHaannddlliinngg SSeerrvviicceess ASME B30.5a-2002 Following approval by the ASME B30 Committee and ASME, and after public review, ASME B30.5a- 2002 was approved by the American National Standards Institute on January 30, 2002. Addenda to the 2000 Edition of ASME B30.5 are issued in the form of replacement pages. Revisions, additions, and deletions are incorporated directly into the affected pages. It is advisable, however that this page, the Addenda title page and copyright pages, and all replaced pages be retained for reference. SUMMARY OF CHANGES This is the first addenda to be published to ASME B30.5-2000. Replace or insert the pages listed. Changes given below are identified on the pages by a margin note, (a), placed next to the affected area. Changes made in ASME B30.5-2000a re indicated by (00). The pages not listed are the reverse sides of the listed pages and contain no changes. Page Location Change 7, 7.1 5-0.2.2 Definitions for operational aid, rated capacity indicator, and rated capacity (load) limiter added 21 5-1 .7.1( d) Terminology revised 26, 26.1 5-1 .9.9 Revised in its entirety 5-1.9.10 Old 5-1.9.11 redesignated as new 5- 1.9.10 5-1.9.11 Old 5-1 .9.12r edesignated as new 5- 1.9.11 27 5-2.1.2(~) Revised 5-2.1.3(f) Revised 28-29.1 5-2.1.6 Revised in its entirety 5-2.3.(3b ) Revised 35-36.1 5-3.2.1 (1) New paragraph 5-3.2.1.a2d ded (2) Existing paragraphs 5-3.2.1.t2h rough 5- 3.2.1.4r edesignated as 5-3.2.1.t3h rough 5-3.2.1.5,re spectively SPECIAL NOTE: The Interpretations to ASME B30.5 are included in this Addenda as a separate section for the user’s convenience. CCOOPPYYRRIIGGHHTT AAmmeerriiccaann SSoocciieettyy ooff MMeecchhaanniiccaall EEnnggiinneeeerrss LLiicceennsseedd bbyy IInnffoorrmmaattiioonn HHaannddlliinngg SSeerrvviicceess MOBILE AND LOCOMOTIVE CRANES ASME B30.5a-2002 load indicator: a device that measures the weight of control the lowering rate of speed of the load hoist the load. mechanism. load ratings: crane ratings in pounds (kilograms) es- qualijìed operator: an operator who has met the re- tablished by the manufacturer in accordance with para. quirements of paras. 5-3.1.2(a), (b), and (c). 5-1.1. qualijìed person: a person who, by possession of a mast (boom): a frame hinged at or near the boom recognized degree in an applicable field or certificate of hinge for use in connection with supporting a boom. professional standing, or who, by extensive knowledge, The head of the mast is usually supported and raised training, and experience, has successfully demonstrated or lowered by the boom hoist ropes. the ability to solve or resolve problems relating to the subject matter and work. mast (jib): a frame hinged at or near the boom point for use in connection with supporting a jib. rail clamp: a tong-like metal device mounted on a locomotive crane car, which can be connected to normal operating conditions the track. cab- or station-operated cranes: conditions during which a crane is performing functions within the manu- rated capacity indicator: a device that automatically (a) facturer’s operating recommendations. Under these con- monitors radius, load weight, and load rating and warns ditions, the operator is at the operating control devices the crane operator of an overload condition. on the crane, and no other persons except those ap- rated capacity (load) limiter: a device that automati- (a) pointed are to be on the crane. cally monitors radius, load weight, and load rating and ground- or floor-operated cranes: conditions during prevents movements of the crane which would result which a crane is performing functions within the manu- in an overload condition, facturer’s operating recommendations. Under these con- reeving: a rope system in which the rope travels ditions, the operator is at the operating control devices around drums and sheaves. that are mounted to the crane but operated with the operator off the crane, and no other persons except repetitive pickup point: when operating on a short those appointed are to be on the crane. cycle operation, the rope being used on a single layer and being spooled repetitively over a short portion of remote-operated cranes: conditions during which a the drum. crane is performing functions within the manufacturer’s operating recommendations. Under these conditions, the rope: refers to wire rope unless otherwise specified operator is at the operating control devices that are rotation resistant rope: a wire rope consisting of an not mounted to any part of the crane, and no other inner layer of strand laid in one direction covered by persons except those appointed are to be on the crane. a layer of strand laid in the opposite direction. This operational aid: an accessory that provides informa- has the effect of counteracting torque by reducing the tion to facilitate operation of a crane or that takes tendency of the finished rope to rotate. control of particular crane functions without action of running rope: a rope that travels around sheaves or the operator when a limiting condition is sensed. drums. outriggers: extendable or fixed members attached to shall: this word indicates that the rule is mandatory the mounting base, which rest on supports at the outer and must be followed. ends used to support the crane. should: this word indicates that the rule is a recom- pawl (dog): a device for positively holding a member mendation, the advisability of which depends on the against motion in one or more directions. facts in each situation. payload: that load or loads being transported by the side loading: a load applied to an angle to the vertical commercial truck chassis from place to place. plane of the boom. pendant: a rope or strand of specified length with stabilizer: stabilizers are extendable or fixed members fixed end connections. attached to the mounting base to increase the stability power-controlled lowering: a system or device in the of the crane, but that may not have the capability of power train, other than the load hoist brake, which can relieving all of the weight from wheels or tracks. CCOOPPYYRRIIGGHHTT AAmmeerriiccaann SSoocciieettyy ooff MMeecchhaanniiccaall EEnnggiinneeeerrss LLiicceennsseedd bbyy IInnffoorrmmaattiioonn HHaannddlliinngg SSeerrvviicceess ASME B30.5a-2002 MOBILE AND LOCOMOTIVE CRANES standby crane: a crane that is not in regular service but that is used occasionally or intermittently as required. standing (guy) rope: a supporting rope that maintains a constant distance between the points of attachment to the two components connected by the rope. structural competence: the ability of the machine and its components to withstand the stresses imposed by applied loads. I superstructure: the rotating upper frame structure of the machine and the operating machinery mounted thereon. 7.1 CCOOPPYYRRIIGGHHTT AAmmeerriiccaann SSoocciieettyy ooff MMeecchhaanniiccaall EEnnggiinneeeerrss LLiicceennsseedd bbyy IInnffoorrmmaattiioonn HHaannddlliinngg SSeerrvviicceess ASME B30.5a-2002 MOBILE AND LOCOMOTIVE CRANES ANSI A1264.1- 1989, Safety Requirements for Work- swing: rotation of the superstructure for movement place Floor and Wall Openings, Stairs, and Railing of loads in a horizontal direction about the axis of Systems rotation. ANSI 226.1-1983, Safety Code for Glazing Materials swing mechanism: the machinery involved in provid- for Glazing Motor Vehicles Operating on Land ing rotation of the superstructure. Highways Publisher: American National Standards Institute swivel: a load carrying member with thrust bearings (ANSI), 11 West 42nd Street, New York, NY 10036 to permit rotation under load in a plane perpendicular to the direction of the load. ~~ ANSI/AWS D1.l-1988, Structural Welding Code - Steel’ swiveling: the rotation of the load attachment portion ANSI/AWS D14.3-1982, Welding Specifications for (hook or shackle) of a load block (lower) or hook Earth Moving and Construction Equipment’ assembly about its axis of suspension in relation to Publisher: American Welding Society (AWS), 550 N.W. the load line(s). LeJeune Road. Miami. F’L 33135 tackle: an assembly of ropes and sheaves arranged ANSI/SAE J185-JUN81, Access Systems for Off-Road for lifting, lowering, or pulling. Machines’ telescoping boom: consists Of a base boom from which ANSI/SAE J765-OCT80, Crane Load Stability Test one or more boom sections are telescoped for additional Code’ length. ANSI/SAE J983-OCT80, Crane and Cable Excavator Basic Operating Control Arrangements2 transit: the moving or transporting of a crane from ANSI/SAE J987-OCT80, Crane Structures - Method one jobsite to another. of Test2 travel: the function of the machine moving under its ANSI/SAE J1026-JUN82, Braking Performance - In- own power from one location to another on a jobsite. Service Crawler Tractors and Crawler Loaders’ ANSI/SAE J1028-OCT80, Mobile Crane Working Area two-block damage prevention feature: a system that Definitions2 will stall when two-blocking occurs without causing ANSI/SAE J 1063-OCT80, Cantilevered Boom Crane damage to the hoist rope or crane machinev compo- Structures - Method of Test’ nents. Publisher: Society of Automotive Engineers (SAE), 400 two-block warning feature: a warning device to alert Commonwealth Drive, Warrendale, PA 15096 the operator of an impending two-blocking condition, ASME B30.8-1988, Floating Cranes and Floating Der- two-blocking: the condition in which the lower load ricks’ block or hook assembly comes in contact with the ASME B30.9- 1990, Slings2 upper load block or boom point sheave assembly. ASME B30.10-1987, Hooks’ wheel base: the distance between centers of front and Publisher: The American Society of Mechanical Engi- rear axles. For a multiple axle assembly the axle center neers (ASME), Three Park Avenue, New York, NY for wheel base measurement is taken as the midpoint 10016-5990; Order Department: 22 Law Drive, Box of the assembly. 2300, Fairfield, NJ 07007-2300 whipline (runner or auxiliary): a secondary rope sys- U.S. DOT Safety Appliance Standards and Power tem usually of lighter load capacity than that provided Brakes Requirements (January 1973, Revised Septem- by the main rope system. ber 1977), DOT Standards, Federal Railroad Adminis- tration, United States Department of Transportation winch head: a power driven spool for handling of (DOT) loads by means of friction between fiber or wire rope Publisher: Superintendent of Documents, Washington, and the spool. D.C. (00) Section 5-0.3 References The is a list Of publications referenced in May also be obtained from American National Standards Institute, this Standard. 11 West 42nd Street, New York, NY 10036. 8 CCOOPPYYRRIIGGHHTT AAmmeerriiccaann SSoocciieettyy ooff MMeecchhaanniiccaall EEnnggiinneeeerrss LLiicceennsseedd bbyy IInnffoorrmmaattiioonn HHaannddlliinngg SSeerrvviicceess MOBILE AND LOCOMOTIVE CRANES ASME 630.5a-2002 0 steep grades are to be negotiated, a retarder or similar (d) shift selective transmissions. device- should be provided. Means shall be provided to hold the machine stationary on the maximum grade 5-1.6.4 Engine Clutch. All cranes with a direct for travel recommended by the manufacturer. Where mechanical or hydrodynamic (such as torque converter travel brakes are operated by air pressure, means shall or fluid coupling) drive to any crane function shall be be provided for manually or automatically stopping the provided with a clutch or other means for disengaging vehicle when the operating pressure falls below the power. The controls shall be within reach of the opera- specified minimum level. tor’s station. (d) Commercial truck vehicle mounted cranes shall meet the requirements of the U.S. Department of Trans- Section 5-1.7 Ropes and Reeving Accessories portation Standards. 5-1.7.1 Rope Design Factors (a) For supporting rated loads and for supporting Section 5-1.6 Controls the boom and working attachments at recommended 5-1.6.1 General travei or transit positions and boom lengths: (a) Basic controls (see Figs. 12 and 13) used during (I) the design factor for live or running ropes the crane operating cycle shall be located within reach that wind on drums or travel over sheaves shall not of the operator while at the operator’s station. be less than 3.5; and (b) Controls for load hoist, boom hoist, swing, and (2) the design factor for boom pendants or standing boom telescope (when applicable) shall be provided ropes shall not be less than 3.0. with means for holding in the neutral position, without (b) For supporting the boom under recommended the use of positive latches. boom erection conditions: (c) On machines equipped with telescoping-type (I) the design factor for live or running ropes booms, the arrangements of controls should be as shown shall not be less than 3.0; and in Fig. 12. On machines not equipped with telescoping- (2) the design factor for boom pendants or standing type booms, the arrangements of controls should be in ropes shall not be less than 2.5. accordance with Fig. 13. (c) Rotation resistant ropes shall have a design factor (d) Remote-operated cranes shall function so that if of 5 or greater [The design factor of 5 or greater for the control signal for any crane motion becomes ineffec- rotation resistant ropes may be modified by the crane tive, the crane motion shall stop. user by complying with the provisions of para. 5- (e) Provisions shall be made for emergency stop in 3.2.1.1 (d)]. the event of a device malfunction for remote-operated (d) The design factor specified in (a), (b), and (c) (al cranes. above shall be the total minimum breaking strength of all ropes in the system divided by the load imposed 5-1.6.2 Control Forces and Movements on the rope system when supporting the static weights (a) Forces shall not be greater than 35 lb (156 N) of structure and crane rated load. on hand levers and not greater than 50 Ib (222 N) on a foot pedals. NOTE: minimal breaking strength formerly referred to as nominal - (b) Travel distance on hand levers shall not be greater breaking strength than 14 in. (356 mm) from neutral position on two- 5-1.7.2 Ropes way levers and not greater than 24 in. (610 mm) on (a) The ropes shall be of a construction recommended one-way levers. Travel distance on foot pedals shall by the rope or crane manufacturer, or a person qualified not be greater than 10 in. (254 mm). for that service. 5-1.6.3 Power Plant Controls. Controls for op- (b) Rotation resistant rope and fiber core ropes shall erating a superstructure mounted power plant shall be not be used for boom hoist reeving. within reach of the operator and shall include the (c) Rotation resistant rope shall be given special means to: care during installation as it is easily damaged. (a) start and stop; (d) Socketing shall be done in the manner specified (b) control the speed of internai combustion engines; by the manufacturer of the wire rope or fitting. (c) stop two-cycle diesel engines under emergency (e) If a load is supported by more than one part of conditions; and rope, the tension in the parts shall be equalized. 21 CCOOPPYYRRIIGGHHTT AAmmeerriiccaann SSoocciieettyy ooff MMeecchhaanniiccaall EEnnggiinneeeerrss LLiicceennsseedd bbyy IInnffoorrmmaattiioonn HHaannddlliinngg SSeerrvviicceess ASME B30.5a-2002 MOBILE AND LOCOMOTIVE CRANES (Diagram Viewed From Operator's Seat) Swing Telescope Hoist , , / ,' Toward f \ / \ / y \, Extend Lower Lower \ / boom ~ ~ a o o o , ' f \ From / \ Retract f \ Hoist Raise \ 1 boom \, ~ \ / Rock forward Rock rearward to retract Telescope Hoist Brake Control Operation 1 Swing Control Push forward to swing toward boom, swinging left for right side operator position and right for left side operator position. For centrally located operator, same as left side operator position. Pull rearward to reverse action. 2 Telescope Control Push forward to extend telescopic boom. Center position to (If Applicable) hold. Pull rearward to retract telescopic boom. 3 Mobile Control Pull rearward to hoist. Center position may be held. Push forward to lower by power. 4 Boom Control Pull rearward to raise boom. Center position to hold. Push forward to lower boom. 5 Telescope Pedal Rock pedal forward to extend telescopic boom. Center (If Applicable) position to hold. Rock pedal rearward to retract telescopic boom 6 Hoist Brake Push to stop or hold lowering load. Release to lower load (if Applicable) GENERAL NOTES: The control arrangement of Fig. 12 applies to mobile telescopic boom crane hand and foot controls. The arrangement of the basic controls should be shown in the control diagram. Controls 1, 2, 3, and 4 are levers for hand operation: controls 5 and 6 are pedals for foot operation, if applicable. Controls for auxiliary functions, such as telescope and hoist, should be located adjacent to the main controls. Controls for all other functions should be positioned to avoid operator confusion and physical interference. Nothing in this recommended practice precludes the use of additional controls subject to the recommendations herein. All basic controls should operate as specified in the control diagram. It is not the intent to limit the use thereof, or to apply to combination, automatic, or other special operating control requirements. FIG. 12 TELESCOPIC BOOM CRANE CONTROL DIAGRAM Suggested Mobile Telescopic Boom Crane Basic Operating Control Arrangement for New Cranes 22 CCOOPPYYRRIIGGHHTT AAmmeerriiccaann SSoocciieettyy ooff MMeecchhaanniiccaall EEnnggiinneeeerrss LLiicceennsseedd bbyy IInnffoorrmmaattiioonn HHaannddlliinngg SSeerrvviicceess MOBILE AND LOCOMOTIVE CRANES ASME B30.5a-2002 ery, brakes, clutches, and operator’s station from the of supporting, without permanent distortion, the weight weather. of a 200 Ib (90 kg) person. (b) All cab glazing shall be safety glazing material as defined in ANSI 226.1. Windows shall be provided Section 5-1.9 General Requirements in the front and on both sides of the cab or operator’s compartment with visibility forward and to either side. 5-1.9.1 Booms Visibility forward shall include a vertical range adequate (a) Boom Stops. Stops shall be provided to resist to cover the boom point at all times. The front window the boom falling backwards. Boom stops should be of may have a section that can be readily removed or one of the following types: held open, if desired. If the section is of the type held (I) a fixed or telescoping bumper; in the open position, it shall be secured to prevent (2) a shock absorbing bumper; or inadvertent closure. A windshield wiper should be (3) hydraulic boom elevation cylinder(s). provided on the front window. (b) Jibs shall be restrained from backward over- (c) All cab doors, whether of the sliding or swinging turning. type, shall be restrained from inadvertent opening or (c) A boom angle or radius indicator readable from closing while traveling or operating the machine. The the operator’s station shall be provided. door adjacent to the operator, if of the swinging type, (d) A boom hoist disconnect, shutoff, or hydraulic should open outward and, if of the sliding type, should relief shall be provided to automatically stop the boom slide rearward to open. hoist when the boom reaches a predetermined high (d) A clear passageway shall be provided from the angle. operator’s station to an exit door on the operator’s side. (e) A boom length indicator readable from the opera- (e) A seat belt shall be provided in all single control tor’s station shall be provided for telescoping booms station wheel mounted cranes for use during transit unless the load rating is independent of the boom and travel. length. 5-1.8.2 Platforms to Cab (f)B ooms, boom sections, and jibs shall be identified and shall be used only for the purposes recommended (a) Principal walking surfaces shall be of a skid- by the manufacturer. resistant type. (b) Outside platforms, if furnished, shall be provided 5-1.9.2 Exhaust Gases. Engine exhaust gases shall with guardrails in accordance with ANSI/SAE 5185. be piped to the outside of the cab and discharged in Where platforms are too narrow to use guardrails, a direction away from the operator. All exhaust pipes handholds shall be provided at convenient points above shall be guarded or insulated to prevent contact with the platform. personnel when performing normal duties. 5-1.8.3 Access to Cab 5-1.9.3 Outriggers (a) On locomotive cranes, handholds and steps shall be provided for access to the car and cab. Their (a) Means shall be provided to hold all outriggers construction shall conform to the requirements of the in the retracted position while traveling, and in the Safety Appliance Standards and Power Brakes Require- extended position when set for operating. ments of the Federal Railroad Administration. (6) Power-actuated jacks, where used, shall be pro- (b) On all crawler and wheel-mounted cranes, hand- vided with the means (such as integral load hold check holds, steps, or both shall be provided, as needed, to valves on hydraulic cylinders, mechanical locks, etc.) facilitate entrance to and exit from the operator’s cab to prevent loss of support under load. and the carrier cab. (c) Means shall be provided for fastening outrigger (c) Principal walking surfaces shall be of a skid- floats to outriggers when in use. resistant type. 5-1.9.4 Locomotive Crane Equipment 5-1.8.4 Cab Roof. Where necessary for rigging or (a) Truck Wedges or Jacks. Locomotive crane cars service requirements, a ladder or steps shall be provided shall be provided with removable wedges or jacks for to give access to the cab roof. The ladder or steps transmitting loads from the crane body directly to the shall conform to the requirements of ANSUSAE J185. wheels without permitting the truck springs to function Where necessary, areas of the cab roof shall be capable when handling heavy loads. These wedges shall be 25 CCOOPPYYRRIIGGHHTT AAmmeerriiccaann SSoocciieettyy ooff MMeecchhaanniiccaall EEnnggiinneeeerrss LLiicceennsseedd bbyy IInnffoorrmmaattiioonn HHaannddlliinngg SSeerrvviicceess ASME B30.5a-2002 MOBILE AND LOCOMOTIVE CRANES O removable, or the jacks releasable, in a manner positive or more shall have a load indicator, rated capacity for transit. indicator or rated capacity (load) limiter (See Section (b) Truck Center Pins. Each truck center pin shall IV, New and Exisiting Installations). be provided with a connecting means, such as a king 5-1.9.9.3 Boom angle or radius indicator [See 5- bolt, to permit truck weight to contribute to crane 1.9.1( c)] . stability. 5-1.9.9.4 Boom hoist disconnect, shutoff, or hy- 5-1.9.5 Welded Construction. All welding proce- draulic relief [see 5-1.9.1(d)]. dures and welding operator qualifications shall be in 5-1.9.9.5 Boom length indicator [see 5-1.9.i(e)]. accordance with ANSIIAWS D14.3 when welding is 5-1.9.9.6 Crane level indicator [see 5-1.9.1 l(d)]. to be performed on load sustaining members. Where special steels or other materials are used, the manufac- 5-1.9.9.7 Drum rotation indicator [see 5- turer shall provide welding procedures. 1.3.2(a)(5)]. O 5-1.9.6 Guards for Moving Parts 5-1.9.1O Lubricating Points. Lubricating points should be accessible without the necessity of removing (a) Exposed moving parts (such as gears, set screws, guards or other parts. projecting keys, chains, chain sprockets, and reciprocat- ing or rotating parts) that might constitute a hazard 5-1.9.11 Miscellaneous Equipment under normal operating conditions shall be guarded. (a) The fuel tank filler pipe shall be located or (b) Guards shall be fastened and shall be capable protected so as not to allow spill or overflow to run of supporting, without permanent distortion, the weight onto the engine, exhaust, or electrical equipment of of a 200 lb (90 kg) person unless the guard is located the machine being fueled. where it is impossible for a person to step on it. (b) Toolbox. A metal receptacle should be secured to the crane for storing tools and lubricating equipment. 5-1.9.7 Clutch and Brake Protection. Dry fric- (c) An audible signal device shall be provided. The tion brakes and clutches shall be protected against rain control for the device shall be within reach of the and other liquids such as oil and lubricants. operator (refer to para. 5-3.3.4). 5-1.9.8 Hydraulic and Pneumatic Line Protec- (d) Means shall be provided for the operator to tion. Exposed lines subject to damage shall be protected visually determine the levelness of the crane. in so far as it is practical. (e) Hydraulic relief valves utilized to limit maximum pressure developed within the hydraulic system shall (al 5-1.9.9 Operational Aids. The crane and/or device have pressure settings to permit operation under rated manufacturer’s instructions shall describe the purpose loading conditions and also to meet the requirements of the device. If a device or devices is not functioning of para. 5-1.3.1(a). or is functioning improperly, the crane and/or device v) Means shall be provided for checking the manu- manufacturer shall provide recommendations for contin- facturer’s specified pressure settings in each hydraulic ued operation or shutdown. Absent such recommenda- circuit. tions, and any prohibitions from the manufacturer (g) A sign shall be installed, visible from the opera- O against further operation [see 5-3.2.1.2(b)]. tor’s station, warning that electrocution or serious bodily 5-1.9.9.1 Two-blocking Features injury may occur unless a minimum clearance of 10 (a) Telescopic boom cranes shall be equipped with an ft (3 m) is maintained between the crane or load for anti-two-block device or a two-block damage prevention energized power lines up to 50 kV, and that greater feature for all points of two-blocking (i.e., jibs, exten- clearances are required for higher voltages [refer to sions) (See Section IV, New and Existing Installations). para. 5-3.4.5(a)( l)]. (b) Lattice boom cranes shall be equipped with an anti-two-block device or a two-block warning feature, Section 5-1.10 Structural Performance which functions for all points of two-blocking (See (a) Prototype booms, jibs, gantries, masts, outriggers, Section IV, New and Existing Installations). carrier frames, and upper frames, of production models 5-1.9.9.2 Load Indicators, Rated Capacity of rope-supported lattice boom cranes shall meet the Indicators, and Rated Capacity Limiters. All performance requirements of ANSI/SAE 5987. On spe- O cranes with a maximum rated load capacity of 3 tons cial designs (not production models) or specific lift 26 CCOOPPYYRRIIGGHHTT AAmmeerriiccaann SSoocciieettyy ooff MMeecchhaanniiccaall EEnnggiinneeeerrss LLiicceennsseedd bbyy IInnffoorrmmaattiioonn HHaannddlliinngg SSeerrvviicceess