1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUNDERWRITERS LABORATORIES CERTIFICATION REQUIREMENT DECISIONThis Certification Requirement Decision is prepared and published by Underwriters Laboratories (UL). Itis normative for the applicable
2、UL Product Certification Program(s); however, it is currently not part ofthe UL Standard(s) referenced below.Product Category (CCN): MULQStandard Number: UL 1637Edition Date: December 29, 2006Edition Number: 4Section / Paragraph Reference: 36.2DECISION:Products utilizing other than a wall or ceiling
3、 type mounting configuration need to comply with the jarringrequirements delineated in 46.1 and 46.3. The jarring force for these types of mounted products shall beapplied directly to the product as described below.The product is to be mounted as intended. An impact of 4.08 J (3 ft-lb) is to be appl
4、ied directlyto any non-display area of the product by means of a 535 g (1.18 lb.), 51-mm (2 inch) diametersteel sphere swung through a pendulum arc from a height (h) of 775 mm (2.54 feet). Theat-rest suspension point of the steel sphere is to be 25.4 mm (1 inch) in front of the plane of theproduct t
5、o be impacted.Wall mounted products weighing more than 30 lbs. may be subjected to the direct impact method or themethod described in 46.2. The direct impact shall be applied to the center of the side of the productintended to be adjacent to the mounting surface during intended mounting.RATIONALE FO
6、R DECISION:The products investigated to this standard utilize a variety of mounting configurations. While the jarringrequirements apply to all products, the standard only describes a test method for wall and ceiling mountedproducts. The test method needs to include free standing and desktop mounted
7、products. For these lattertypes of products, the impact will be directly applied to the product.In some cases involving wall and ceiling mounted products, the size and weight of the product also makethe current test method described difficult to impossible to conduct. The Jarring Test is being revis
8、edfurther to permit either the current method or the direct impact method to be employed on products havingsufficient mass. A demarcation point of 30 lbs. was chosen for this option because laboratory testingindicated that the direct impact jarring force produced the same shift on products weighing
9、30 lbs. or moreas when the same product was mounted on the plywood. In addition, the heavier products dampened thevibration of the plywood board to a point where it was negligible.Copyright 2007 Underwriters Laboratories Inc.UL, in performing its functions in accordance with its objectives, does not
10、 guarantee or warrant thecorrectness of Certification Requirement Decisions it may issue or that they will be recognized or adoptedby anyone. Certification Requirement Decisions are the opinion of Underwriters Laboratories Inc. inpractically applying the requirements of the standard. They do not rep
11、resent formal interpretations of thestandard under American National Standards Institute (ANSI) processes. UL shall not be responsible toanyone for the use of or reliance upon Certification Requirement Decisions by anyone. UL shall not incurUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUC
12、TION ORDISTRIBUTION WITHOUT PERMISSION FROM ULany obligation or liability for damages, including consequential damages, arising out of or in connectionwith the use or reliance upon Certification Requirement Decisions. The electronic version of theCertification Requirement Decision is the current version and previously printed copies may be outdated.This document is published as a service to ULs certification customersSTANDARD NUMBER: UL 1637 -2-
