1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 2344 Material LiftsUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION O
2、R DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Material Lifts, UL 2344 Second Edition, Dated April 14, 2010 SUMMARY OF TOPICS This revision of UL 2344 is being issued to reect the ANSI approval of the standard. The revisions are substantially in accordance with Proposal(s) on t
3、his subject dated February 3, 2012. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. Changes in requirements are marked with a vertical line in the margin and are followed by an effective date note indicating the d
4、ate of publication or the date on which the changed requirement becomes effective. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwise without prior per
5、mission of UL. UL provides this Standard as is without warranty of any kind, either expressed or implied, including but not limited to, the implied warranties of merchantability or tness for any purpose. In no event will UL be liable for any special, incidental, consequential, indirect or similar da
6、mages, including loss of prots, lost savings, loss of data, or any other damages arising out of the use of or the inability to use this Standard, even if UL or an authorized UL representative has been advised of the possibility of such damage. In no event shall ULs liability for any damage ever exce
7、ed the price paid for this Standard, regardless of the form of the claim. Users of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonable attorneys fees) resu
8、lting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. The requirements in this Standard are now in effect, except for those paragraphs, sections, tables, gures, and/or other elements of the Standard having future effective d
9、ates as indicated in the note following the affected item. The prior text for requirements that have been revised and that have a future effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. MAY 15, 2012 UL 2344 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED
10、 FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MAY 15, 2012 UL 2344 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 14, 2010 (Title Page Reprinted: May 15, 2012) 1 UL 2344 Standard for Mate
11、rial Lifts First Edition May, 2005 Second Edition April 14, 2010 This ANSI/UL Standard for Safety consists of the Second Edition including revisions through May 15, 2012. The most recent designation of ANSI/UL 2344 as an American National Standard (ANSI) occurred on May 15, 2012. ANSI approval for a
12、 standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Dev
13、elopment System (CSDS) at http:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property o
14、f UL. COPYRIGHT 2012 UNDERWRITERS LABORATORIES INC. ANSI/UL 2344-2012UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 14, 2010 MATERIAL LIFTS - UL 2344 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTIO
15、N OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .5 2 Components 5 3 Undated References 6 4 Units of Measurement .6 5 Glossary .6 6 Lubrication .7 CONSTRUCTION 7 General 8 8 Materials and Assembly .8 9 Protection Against Corrosion .9 10 Shafts, Fillets, Keys, and Splines 9
16、11 Drums and Sheaves .9 11.1 Winding drums 9 11.2 Traction drums and traction sheaves .10 11.3 Deection sheaves .10 11.4 Transfer drums and directional sheaves .10 12 Gears .10 13 Manually Powered Lifts 10 14 Pneumatically Powered Lifts .11 PERFORMANCE ALL LIFTS 15 Normal-Operation Test 11 16 Endura
17、nce Test 11 17 Strength Test .11 18 Wire-Rope Test .12 19 Load-Limiting Test 12 19.1 Power-operated lifts 12 19.2 Manually-operated lifts 13 20 Speed .13 21 10-Day Moist Ammonia Test .13 ELECTRICALLY POWERED LIFTS 22 Electrically Powered Lifts 13 PNEUMATICALLY POWERED LIFTS 23 Pneumatically Powered
18、Lifts .14 23.1 Input-pressure test .14 23.2 Hydrostatic-pressure test 14 APRIL 14, 2010 MATERIAL LIFTS - UL 2344 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MANUFACTURING AND PRODUCTION TESTS ELECTRICALLY POWERED MATERIAL LIFTS 24 Gener
19、al 15 MARKING 25 General 15 INSTRUCTIONS 26 Installation and Operating Instructions .16 APPENDIX A Standards for ComponentsA1 APRIL 14, 2010 MATERIAL LIFTS - UL 2344 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 T
20、hese requirements cover manually, electrically and pneumatically powered lifts. They are intended for the lifting and transport of materials and not for the movement or support of people. They are rated 250 volts or less, to be employed in nonhazardous environmental locations in accordance with the
21、National Electrical Code, NFPA 70. 1.2 This standard does not apply to the following equipment: a) Permanently installed material lifts, serving specic levels of a building and/or tted with a car; b) Power operated lifting platforms for persons with impaired mobility; c) Mobile elevating work platfo
22、rms; d) Vehicle lifts (for maintenance); and e) Powered forklift trucks. 2 Components 2.1 Except as indicated in 2.2, a component of a product covered by this Standard shall comply with the requirements for that component. See Appendix A for a list of Standards under which components are evaluated.
23、2.2 A component is not required to comply with a specic requirement that: a) Involves a feature or characteristic not required in the application of the component in the product covered by this standard, or b) Is superseded by a requirement in this standard. 2.3 A component shall be used in accordan
24、ce with its rating established for the intended conditions of use. 2.4 Specic components are incomplete in construction features or restricted in performance capabilities. Such components are intended for use only under limited conditions, such as certain temperatures not exceeding specied limits, a
25、nd shall be used only under those specic conditions. APRIL 14, 2010 MATERIAL LIFTS - UL 2344 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3 Undated References 3.1 Any undated reference to a code or standard appearing in the requirements
26、of this standard shall be interpreted as referring to the latest edition of that code or standard. 4 Units of Measurement 4.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 5 Glossary 5.1 For the purpose of this standard the f
27、ollowing denitions apply. 5.2 CIRCUITS, ELECTRICAL: a) High-Voltage A circuit with a potential of not more than 600 volts having circuit characteristics greater than those of a low-voltage power-limited circuit. b) Low-Voltage A circuit with a potential of not more than 30 volts AC rms, 42.4 volts D
28、C or AC peak, and supplied by: 1) A primary battery; 2) A Class 2 transformer; or 3) A combination of transformer and xed impedance that, as a unit, complies with all of the performance requirements for a Class 2 transformer. 5.3 DRUM, TRACTION A type of drum that does not accumulate the suspension
29、rope, but ascends or descends the rope as a result of friction between the rope and the drum. 5.4 DRUM, TRANSFER A drum used to transfer the suspension wire rope from one groove to another groove on the traction drum of a traction lift. 5.5 DRUM, WINDING A drum that accumulates the suspension rope i
30、n one or more layers. 5.6 ELECTRIC SHOCK A risk of electric shock is considered to exist at any exposed part when the available open-circuit potential is more than 42.4 volts peak, 30 volts rms, and the available current through a 1500-ohm resistor is more than 5 milliamperes. 5.7 LIFT, ELECTRICALLY
31、 POWERED A lift in which the prime mover is powered by electricity. 5.8 LIFT, MANUALLY POWERED A lift in which the lifting power is derived directly from the operator. 5.9 LIFT, PNEUMATICALLY POWERED A lift in which the prime mover is powered by compressed gases. 5.10 LIFT, POWER-OPERATED An electri
32、cally powered lift or a pneumatically powered lift. 5.11 PRIME MOVER The source of power for the lift, exclusive of any speed reducer. APRIL 14, 2010 MATERIAL LIFTS - UL 2344 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.12 RATED WORKIN
33、G LOAD The manufacturers specied maximum load to be lifted by the lift. The maximum load includes the weight of all materials, and all dead loads lifted by the lift. Dead loads include the weight of: a) The lift; b) Wire rope (winding drum and tail line); c) Platform and platform supports; d) Guard
34、rails; e) Building ties; f) Rollers, standoffs, and wire winder; g) Electrical cords or air supply hoses; and h) Other related equipment as applicable that may be included on a stage or otherwise lifted by a lift. 5.13 SHEAVE, DEFLECTION A sheave used for small directional changes or deections of th
35、e wire rope. 5.14 SHEAVE, DIRECTIONAL A sheave used to transfer or change the direction of the wire rope. 5.15 SHEAVE, TRACTION A single-wrap sheave that does not accumulate the suspension rope, but ascends or descends the rope as a result of friction between the rope and the sheave. 5.16 SPEED REDU
36、CER A device used to reduce the output speed of the prime mover to the desired speed of the lift. 6 Lubrication 6.1 Each separate enclosure of a material lift shall be provided with a means to maintain lubrication of all moving parts requiring lubrication at all times, unless self-sealed, self-lubri
37、cating, and dry bearings are used. APRIL 14, 2010 MATERIAL LIFTS - UL 2344 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONSTRUCTION 7 General 7.1 A material lift shall include all of the components necessary for its normal function and
38、installation, and shall be furnished as a single unit or assembly. 7.2 A product shall be constructed so that it will have the strength and durability to withstand normal usage and to comply with the performance requirements. 7.3 An exposed metal surface shall be free from sharp edges, burrs, and ot
39、her features that constitute a risk of injury to persons. 7.4 Bolt and rivet holes shall be accurately made and burrs shall be removed. 7.5 Each rivet shall be of proper size for the rivet hole, without major visible cracks or splits, concentric with the rivet hole, and in contact with the surface o
40、f the member so that a 0.005 inch (0.13 mm) feeler gauge cannot be fully inserted between the rivet head and the surface of the member or between two members attached together by a rivet. 7.6 All welds shall be free from undercuts, cracks, and closely spaced in-line surface porosity. 7.7 Based on th
41、e intended use of the material lift, installation instructions, and product markings, the stability will need to be evaluated including the following end-use considerations: location on uneven ground or inclines, type of ground surface, non-centered loads, and sliding loads off or unto the platform
42、representing loading and unloading during actual use in raised and lowered conditions. 8 Materials and Assembly 8.1 All metal parts and ttings shall be made of aluminum or steel alloys, wrought iron, malleable iron, or other metal that is of equivalent strength for the intended purpose and shall be
43、securely attached by means of rivets, bolts, screws, or other means determined to be the equivalent. Cast gray iron shall not be used for load-carrying parts. 8.2 Nuts shall be lock nuts or provided with lock washers. APRIL 14, 2010 MATERIAL LIFTS - UL 2344 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FO
44、R FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 9 Protection Against Corrosion 9.1 Different metals shall not be used in combination such as to cause galvanic action that will adversely affect the strength of the product. 9.2 When corrosion of a part interferes with the proper func
45、tion of a material lift, the part shall be of a corrosion resistant material (aluminum, brass, copper, stainless steel, or other metal inherently resistant to corrosion) or be provided with corrosion protection. 9.3 Corrosion protection shall be by metallic or nonmetallic coatings, such as galvanizi
46、ng, sherardizing, plating, or painting. 9.4 A part made of drawn brass or machined from brass rod incorporating internal threads made of a copper alloy containing more than 15 percent zinc shall be capable of withstanding, without cracking, the 10-Day Moist Ammonia Test, Section 21. 10 Shafts, Fille
47、ts, Keys, and Splines 10.1 A llet shall be provided at any point of change in the diameter of the hoist shafts and the sheave shafts to reduce stress concentration in the shafts. Fitted keys, splines, bolts, or machine screws shall be used in all connections subject to torque. 11 Drums and Sheaves 1
48、1.1 Winding drums 11.1.1 The minimum pitch diameter of a multiple-wrap winding drum shall not be less than ten times the diameter of the wire rope used. Exception: For a manually-operated lift, the minimum pitch diameter of a multiple-wrap winding drum may be less than ten times the diameter of the
49、wire rope used, but shall not be less than eight times the diameter of the wire rope used. 11.1.2 A winding drum shall be provided with a positive means for attaching the wire rope. The attachment shall comply with the requirement specied in 18.3. 11.1.3 To provide level winding of the wire rope, a winding drum on a powered lift shall be constructed so that during operation, the suspension wire will wrap without cross-wrapping, improper spooling, or loss of winding. APRIL 14, 2010 M
