1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUNDERWRITERS LABORATORIES INC. CERTIFICATION REQUIREMENT DECISIONThis Certification Requirement Decision is prepared by UL LLC. It is normative for the applicable ULProduct Certification Program(
2、s); however, it is currently not part of the UL Standard(s) referencedbelow.Product Category (CCN): KMEXStandard Number: UL 1240Standard Title: Standard for Electric Commercial Clothes-Drying EquipmentEdition Date: October 4, 2005Edition Number: 4Section / Paragraph Reference: Table 20A.2Subject: Cl
3、arification of Endurance Cycles for Control DevicesDECISION:20A.3.4 Controls that manage a SCF and that does not rely on software shall comply with the standardsspecified in 20A.3.2 except for Controls Using Software, H.11.12, in the Standard for Automatic ElectricalControls - Part 1: General Requir
4、ements, UL 60730-1. If software is relied upon to perform the protectivecontrol function, it shall be considered Software Class B as indicated in Table 20A.2.Table 20A.2Protective control correlation table(See 20A.3)Information Protective control requirementFMEA Conduct a failure-mode and effect ana
5、lysis (FMEA) identifyingcomponent failures which may result in a risk of fire, electricshock or injury and confirming the protective function continuesto operate as intended.Operating ambient Determined in accordance with Section 36, Temperature Test,of the applianceEndurance testing for electromech
6、anical devices a) 6, 000 cycles for controls as indicated in 20A.5, 20A.6,20A.7, and for manual, non-self-resetting temperature-limitingdevices (see 38.6), and other manual, non-self-resettingprotective controlsb) 100,000 cycles, for automatic, self-resetting temperature-limiting controls, combinati
7、on temperature-limiting andregulating controls, and other automatic, self-resettingprotective controls (see 38.6)Overvoltage category Overvoltage Category IIPollution degree See 24A.4Radio-frequency electromagnetic field immunity to conducteddisturbancesTest Level 3Radio-frequency electromagnetic fi
8、eld immunity to radiatedelectromagnetic fieldsField strength of 3 V/mFast transient bursts Test Level 3 applied for 1 minute in each polaritySurge immunity Installation Class 3Electrostatic discharge Severity Level 3Thermal cycling for electronic devices 14 days, Assumed temperature range: 10.0 +2 C
9、 to theoperating ambientSoftware class Software Class B (See 20A.3.4)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULRATIONALE FOR DECISION:This Certification Requirement Decision is intended to clarify the endurance cycles for operating andpr
10、otective control devices, and documents present practice in the application of these requirements.Copyright 2017 UL LLCUL LLC, in performing its functions in accordance with its objectives, does not guarantee or warrant thecorrectness of Certification Requirement Decisions it may issue or that they
11、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 National Standards Institute (ANSI) processes. UL LLC shall not b
12、e 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 1240 -2-
