UL 982 CRD-2016 UL Standard for Safety Motor-Operated Household Food Preparing Machines - Section Paragraph Reference 26 10 Table 6 2 Subject Magnetic Interlock (Edition 7 June 10.pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUL LLC CERTIFICATION REQUIREMENT DECISIONThis Certification Requirement Decision is prepared by UL LLC. It is normative for the applicable ULProduct Certification Program(s); however, it is curre

2、ntly not part of the UL Standard(s) referencedbelow.Product Category (CCN): IPWZStandard Number: UL 982Standard Title: Standard for Motor-Operated Household Food Preparing MachinesEdition Date: June 10, 2015Edition Number: 7Section / Paragraph Reference: 26.10, Table 6.2Subject: Magnetic InterlockDE

3、CISION:Table 6.2Protective control parametersProtective control parameter Minimum specificationFMEA Conduct a failure-mode and effect analysis (FMEA) to identifycomponent failures which may result in a risk of electric shock,fire or injury and confirming protective function continues tooperate as in

4、tended. (1)Operating Ambient Determined via the Normal Temperature Test on the appliance(Section 34)Endurance Testing Except for interlocks, as indicated in 6.18.3.2, 6000 cycles ofoperation required for controls starting or stopping the motorOvervoltage Category Overvoltage Category IIPollution Deg

5、ree Pollution Degree 2Enclosure Flammability As specified in Section 61 for portable appliances or Section62 for other appliancesConducted Disturbances Test Level 3Radiated Electromagnetic Fields Test Level 3Fast Transient Bursts Test Level 3 applied for 2 minutes in each polaritySurge Immunity Inst

6、allation Class 2Electrostatic Discharge Test Level 3Thermal Cycling Temperature range: 10.0 2C to the Operating AmbientSoftware Class Software Class B (See 6.5.3.3)Notes: (1) For a magnetic interlock reed switch, the short-circuit failure mode of the contacts is excluded due to the InterlockSystem E

7、ndurance Test of 55.2.26.10.1 For a magnetic interlock, common magnets are considered readily available with respect to26.10(c). A magnetic interlock is considered to comply with 26.10(c) if common magnets are not able todefeat the interlock by a construction with:a) An actuating magnet with a highe

8、r magnetic flux density than common household magnets,such as rare earth magnets;b) A coded actuating magnet with a special pole arrangement, such as North-South-North;c) Recessing or guarding of the area where the actuating magnet must be located; orUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHE

9、R REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULd) More than one magnetic interlock where common household magnets will not stay in placebut must be held in place in order to activate the interlock due to the location or shape of theenclosure or the pole orientation of the magnet (requiring

10、an opposing force).RATIONALE FOR DECISION:UL 982 presently contains requirements for switches, controls, and interlocks. Present requirementsprovide guidance for when an interlock is required and requirements to evaluate the suitability of theinterlock system.A magnetic interlock is one type of inte

11、rlock that may be employed in an appliance. Magnetic interlocksare actuated by proximity of a corresponding actuating magnet of specific strength or configuration.Common magnets are considered readily available materials in a kitchen with respect to 26.10.Requirements are being proposed to provide s

12、pecific guidance for judging the acceptably of magneticinterlocks with respect to defeating the interlock with common magnets.If electronic controls are relied upon to provide the magnetic interlock function, the protective controlrequirements are already specified. However, a Note is proposed to Ta

13、ble 6.2 to waive the short circuitfailure mode for a reed switch since the reliability of the contacts are evaluated via the interlock systemendurance test.Copyright 2016 UL LLCUL LLC, in performing its functions in accordance with its objectives, does not guarantee or warrant thecorrectness of Cert

14、ification Requirement Decisions it may issue or that they will be recognized or adoptedby anyone. Certification Requirement Decisions are the opinion of UL LLC. in practically applying therequirements of the standard. They do not represent formal interpretations of the standard underAmerican Nationa

15、l Standards Institute (ANSI) processes. UL LLC shall not be responsible to anyone forthe use of or reliance upon Certification Requirement Decisions by anyone. UL LLC shall not incur anyobligation or liability for damages, including consequential damages, arising out of or in connection withthe use or reliance upon Certification Requirement Decisions. The electronic version of the CertificationRequirement 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 982 -2-