1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSeptember 9, 20051SUBJECT 2339OUTLINE OF INVESTIGATIONFORMOBILE AND MODULAR STAGESIssue Number: 1SEPTEMBER 9, 2005Summary of TopicsThis first issue of Subject 2339, Outline of Investigation for M
2、obile andModular Stages, covers requirements for fabricated mobile folding stageassemblies and modular (sectional) stages.The UL Foreword is no longer located within the UL Standard. For informationconcerning the use and application of the requirements contained in thisStandard, the current version
3、of the UL Foreword is located onULStandardsInfoNet at: http:/ 2005 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSEPTEMBER 9, 2005SUBJECT 23392No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTH
4、ER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .4CONSTRUCTION2 General 4PERFORMANCE3 Load Test 44 Decking-Strength Test 5MARKING5 General 5SEPTEMBER 9, 2005 SUBJECT 2339 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERM
5、ISSION FROM ULINTRODUCTION1 Scope1.1 These requirements cover fabricated mobile folding stage assemblies and modular (sectional) stages.CONSTRUCTION2 General2.1 A product shall be constructed so that it will have the strength and durability to withstand normalusage and to comply with the performance
6、 requirements.2.2 An exposed metal surface shall be free from sharp edges, burrs, and other features that constitute arisk of injury to persons.2.3 Bolt and rivet holes shall be accurately made, and burrs more than 1/32 inch (0.8 mm) high shall beremoved.2.4 Each rivet shall be of proper size for th
7、e rivet hole, without major visible cracks or splits, concentricwith the rivet hole, and in contact with the surface of the member so that a 0.005 inch (0.13 mm) feelergauge cannot be fully inserted between the rivet head and the surface of the member or between twomembers attached together by a riv
8、et.2.5 All welds shall be free from undercuts, cracks, and closely spaced in-line surface porosity.PERFORMANCE3 Load Test3.1 A product shall withstand, without failure or visible damage to the structure, a load equal to the squarearea of the floor multiplied by the manufactures rating per square foo
9、t multiplied by four (area ft2x ratinglb/ft2x 4), the load is distributed over the entire stage area.3.2 The product is to be placed in a flat, horizontal position and supported by its legs and/or castors ifprovided.SEPTEMBER 9, 2005SUBJECT 23394UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REP
10、RODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL4 Decking-Strength Test4.1 A product shall withstand, without failure or visible damage to the structure, a load of 1000 pounds(454 kg) when tested as described in 4.2.4.2 The decking strength is to be determined with the test unit in a flat, horizo
11、ntal position, supported byits legs and/or castors if provided. The test load is to be applied to the least supported decking area usinga 4 by 9 inch block. The test is to be done with the block parallel and perpendicular to the sides.MARKING5 General5.1 Each unit shall be marked with the following
12、the manufacturers or private labelers name oridentifying symbol.5.2 Distinctive model number, catalog or equivalent designation.5.3 Each unit shall be marked with load rating.5.4 If a manufacturer produces the devices at more than one factory, each device shall have a distinctivemarking to identify the manufacturing location.SEPTEMBER 9, 2005 SUBJECT 2339 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSEPTEMBER 9, 2005SUBJECT 23396No Text on This Page
