1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUNDERWRITERS LABORATORIES INC. CERTIFICATION REQUIREMENT DECISIONThis Certification Requirement Decision is prepared and published by Underwriters Laboratories Inc.(UL). It is normative for the a
2、pplicable UL Product Certification Program(s); however, it is currently notpart of the UL Standard(s) referenced below.Product Category (CCN): AMQV, AMQV2Standard Number: UL 634Standard Title: Standard for Connectors and Switches for Use with Burglar-AlarmEdition Date: October 12, 2007Edition Number
3、: 9Section / Paragraph Reference: Sections 19.2 and 64Subject: Operating Gap All SwitchesDECISION:All UL 634 switches must meet the minimum operating gap of 1/8 inch (3.2 mm) specified in section 19in addition to the specific requirements of sections 49 65 for Level 1 and Level 2 switches. Clarifyin
4、gstatements are shown in strike through and underlined text.19 Operation Test19.1 General19.2 Magnetically actuated switches19.2.1 Magnetically actuated switches intended for installation on magnetic materials shall operate asintended with a gap of 1/8 inch (3.2 mm) or more between the magnet and th
5、e switch housings when bothhousings are mounted on a 1/4 inch (6.4 mm) thick mild steel plate as intended in service.19.2.1.1 Level 1 and Level 2 high security switches shall have an operational gap of 1/8 in. (3.2 mm) inaddition to complying with the applicable requirements specified in Sections 49
6、 65.19.2.2 As the maximum acceptable gap of separation is based upon the parameters of field installation,the gap of separation of unmounted samples of each magnetically actuated switch construction is to bemeasured on nonmagnetic material for informational purposes. The gap of separation is the dis
7、tancebetween the magnet and switch housings at the point where the magnet releases the switch mechanism.64 Foreign Magnetic Field Compromise Tests64.3 For the SMT test magnet and shunt selection:a) The MOG equals the open air distance from the surface of the BMS switch to the actuator,and shall be a
8、djusted to its maximum distance in accordance with the manufacturinginstructions. 1/8 inch (3.2 mm) operating gap (also reference 19.2.1).RATIONALE FOR DECISION:UL 634 performance tests are intended to be incremental in security with all switches meeting the generalrequirements of section 19, and in
9、cremental in performance to Level 1 then Level 2 (High SecurityBalanced Magnet Switches). These clarifications show that 1/8 inch (3.2 mm) operating gap applies to allswitches covered by this standard and manufacturers instructions are not allowed exceptions to the basicrequirements of the standard.
10、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCopyright 2013 Underwriters Laboratories Inc.UL, in performing its functions in accordance with its objectives, does not guarantee or warrant thecorrectness of Certification Requirement Decisions
11、 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 represent formal interpretations of thestandard under American National Standa
12、rds Institute (ANSI) processes. UL shall not be responsible toanyone for the use of or reliance upon Certification Requirement Decisions by anyone. UL shall not incurany 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 634 -2-
