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): IYMT, IYMX, IYNA, , IYNE, IYNG, IYNI, IYNS, IYQXStandard Number: UL 962Standard Title: Standard for Household and Commercial FurnishingsEdition Date: November 7, 2014Edition Number: 4Section / Paragra
3、ph Reference: 3.10, 10.1.3 Exception No. 4, 12.1 Exception 2, 51.3 -New 12.1 Exception -RevisedSubject: Clarification of Class 2 / LPS Circuits, and insulating materials in directsupport with live parts.DECISION:2 Glossary2.12B DIRECT AND INDIRECT CONTACT WITH LIVE PARTS - A non-metallic part is con
4、sidered indirect contact with a live part when it is touching the live part or is within 1/32 inch (0.8 mm) of the livepart. Indirect contact is when a non-metallic part is supporting a material that is in direct contact with thelive parts.3 Components3.7 Video or audio equipment shall comply with t
5、he Standard for Audio, Video, and Similar ElectronicApparatus Safety Requirements, UL 60065 or Audio/Video, Information and Communication TechnologyEquipment - Part 1: Safety Requirements, UL 62368. Video or audio equipment intended for use in adamp or wet locations shall comply with the tropical hu
6、midity requirements in these standards UL 60065.3.10 Wireless charging pad shall comply with the Standard for Induction Power Transmitters andReceivers for use with Low Energy Products, UL 273810 Frame and Enclosure10.1 General10.1.3 A part such as a splice, tap, wire, transformer, capacitor, ballas
7、t, current-carrying part, or devicewith an exposed live part shall be contained in an enclosure constructed of metal, glass, ceramic,porcelain, or polymeric material. Such parts shall be contained in the enclosure during normalmaintenance and use.Exception No. 1: A current-carrying part of a wiring
8、device (such as the screw shell and center contact ofa lampholder, the lampholder contacts, starter holder contacts, or similar components of a fluorescentluminaire) that are normally fitted with a functional component (a lamp, a starter, or similar component)during use of the furnishing is not requ
9、ired to be additionally enclosed.Exception No. 2: A component, such as a ballast, that has an integral outer housing that has beenevaluated as an enclosure is not required to be additionally enclosed.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FR
10、OM ULException No. 3: A power-supply cord is not required to be contained within the furnishing other than atthe connection point to internal components.Exception No. 4: Components in a Class 2 or LPS circuit do not need to be in an enclosure, but if one isprovided it shall comply with Supplement SA
11、3.10.4 Electrical enclosures of polymeric material10.4.1 A polymeric material enclosure of electrical parts shall comply with the requirements in theStandard for Polymeric Materials Use in Electrical Equipment Evaluations, UL 746C, as applicable topolymeric enclosures. For Damp Locations, the Resist
12、ance to Impact Test of the Standard for PolymericMaterials - Use in Electrical Equipment Evaluations, UL 746C, preconditioning shall be at a temperatureof 0 2.0C (32 3.6F). For wet locations, the UV Light Exposure and Cold Impact Test of the Standardfor Polymeric Materials - Use in Electrical Equipm
13、ent Evaluations, UL 746C, preconditioning shall be at atemperature of minus 35.0 2.0C (minus 31.0 3.6F).13 Resistance to Moisture and Liquid Damage17 Internal Wiring17.1 Conductors17.1.4 Internal wiring shall consist of wires of a type or types that are determined to meet the requirementsfor the int
14、ended use with respect to flexibility, mechanical abuse, temperature, ampacity, and voltage.Conductors of any cross-sectional-area are permitted when the conductors are in Class 2 or LPS circuits.17.1.12 Class 2 or LPS wiring not contained within a metal or polymeric enclosure that is intended to be
15、routed within a furnishing shall be of a type suitable for the application (e.g. CL2, CL2P, CL3, CL3P,CL3R, CM, CMP, CMR, PLTC, or other jacketed type cord with a minimum 0.013 inch (0.33 mm) jacketthickness).33 Electrical Insulation in Direct and Indirect Contact with Live Parts33.1 Electrical insu
16、lation in direct or indirect contact with uninsulated live parts other than magnet wirecoating shall be a material investigated and found acceptable in accordance with the electrical insulationrequirements of the Standard for Polymeric Materials - Use in Electrical Equipment Evaluations, UL746C.The
17、material shall withstand the most severe conditions likely to be met in service.Exception: Small parts and adhesives need not be investigated if they are:a) Not relied upon to maintain the proper functioning of the device with regard to the likelihoodof electric shock, fire, and injury to persons; a
18、nd/orb) Not relied upon to maintain separation between uninsulated live parts of opposite polarity,live parts, and accessible metal parts and/or uninsulated live parts and earth ground.33.2 After the conditioning specified in 34.1, conditioning of polymeric components, and upon cooling toroom temper
19、ature, there shall there be no evidenc of softening, shrinkage, warpage, or other distortion ofparts that results in any of the following:a) Reduction of spacings between uninsulated live parts of opposite polarity, uninsulated liveparts and accessible dead or grounded metal, and uninsulated live pa
20、rts and the enclosurebelow the minimum acceptable values;STANDARD NUMBER: UL 962 -2-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULb) Uninsulated live parts or internal wiring accessible to contact, or defeating the integrity of theenclosure
21、so that acceptable mechanical protection is not afforded to internal parts of theequipment;c) Interference with the intended operation or servicing of the equipment if the equipment isoperable.52 Temperature Test52.1.2A Material provided for direct or indirect contact with live parts and any electri
22、cal insulating barriershall be suitable for continuous operation at the maximum temperature measured on the material.MARKINGS67 General67.2A A unit intended for dry locations only shall not be provided with any information such as markings,instructions, or illustrations that implies or depicts damp
23、or wet use.67.2B May be marked as suitable for damp locations, and shall not be provided with any information suchas markings, instructions, or illustrations that implies or depicts wet use.SUPPLEMENT SA - CLASS 2, LPS or SELV MOTOR AND HEATING CIRCUITS IN FURNISHINGSCONSTRUCTIONSA3 Enclosures and E
24、lectrical InsulationSA3.1 FlammabilitySA3.1.1 Enclosures containing Class 2, LPS or SELV circuits shall be noncombustible, or a polymericmaterial that complies with Table SA3.1.Exception No. 1: Does not apply to small parts not exceeding 0.122 in3(2 cm3).Exception No. 2: Does not apply to materials
25、with an exposed edge not exceeding 0.04 inches (1 mm)thick and sandwiched between two metal parts.Exception No. 3: Enclosures containing 15 watt or less circuits are not required as specified in footnote bof Table SA3.1.SA3.2 Relative thermal indexSA3.2.1 A polymeric material used as the enclosure o
26、r in direct contact with live parts shall have amechanical with impact RTI and electrical temperature RTI of at least the temperature of the partmeasured during the normal temperature test.Exception: When the temperature measured during the normal temperature test is less than 50C(122F) or less, the
27、 polymeric material is not required to have an RTI rating.SA3.3 Electrical propertiesSTANDARD NUMBER: UL 962 -3-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSA3.3.1 A polymeric material used as the enclosure of live parts in direct contact
28、or within 1/32 inch (0.8mm) of current-carrying parts that was not evaluated under the component standard shall have a HWIproperty that is as indicated in the table for Material Property Considerations in the Standard for PolymericMaterials Use In Electrical Equipment Evaluations, UL 746C. CTI and H
29、AI ratings are not required.Table SA6.1Interconnecting conductors and cable typesFurnishing typeAllowable interconnecting conductors and cable typesPotential energy source15 watts or less(D)Class 2 or LPS SELVPortable AorBorC BorC CStationary A or B or C B or C CFixed AorBorC BorC CA) The conductor
30、or cable shall be rated for the intended temperature, power and voltage.B) Cords or cables not evaluated as a part of the component product requirement and not contained within a metal or polymericenclosure in accordance with Table SA3.1 shall be a jacketed type CL3, CL3R, CL3P, Power-limited Circui
31、t Cable or otherjacketed type cord with a minimum 0.013 inch (0.33 mm) jacket thickness or the combined conductor and jacket thickness notless than 0.013 inch (0.33 mm). Individual conductors may not be utilized outside a fire enclosure or without an overall jacketcovering.C) The cable or cord shall
32、 comply with Power Supply Connections, Section 9, or other jacketed type cord with a minimumaverage jacket thickness of 0.015 inch (0.38 mm) and with a VW-1 flammability rating. Individual conductors may not be utilizedoutside a fire enclosure or without an overall jacket covering. SPT-2 and SPT-3 c
33、ord types are acceptable.D) 15 watts or less under any loading condition. See Circuit Power Limit Measurement Test, SA11.SA7 ConnectorsSA7.2 A unit with multiple Class 2 / LPS supply or load connections, where interconnection couldcumulatively exceed Class 2 / LPS limits, shall be provided with mean
34、s that prohibit such interconnection.SA11 Circuit Power Limit Measurement TestSA11.1 A determination shall be made as to which points in the circuit are capable of delivering a powergreater than 15 watts for more than 5 seconds into an external variable resistor connected singly betweeneach point in
35、 the circuit and its supply return (circuit common). See SA11.2.SA11.2 To determine the points capable of delivering a power of more than 15 watts, the external resistoris to be set for maximum resistance before being connected to the circuit under investigation. The externalresistor is to be adjust
36、ed until the maximum wattage is consumed as indicated by a peak reading of thewattmeter. A reading of greater than 15 watts indicates that the points are capable of delivering greaterthan 15 watts. The external resistor is to then be moved, point by point, from the point farthest from theload to oth
37、er points toward the load side of the circuit until a point is reached where the maximum powerconsumed by the external resistor (as indicated by a peak reading of the wattmeter) is not more than 15watts. During the test, the appliance is to be connected to a source of supply and operated as specifie
38、din the Temperature Test, Section 52.Exception: When the portion of the appliance in question is tested separately from the main body of theappliance, the source of supply and loading are to be equivalent to those supplied to the circuit within theappliance when the appliance is operated as specifie
39、d in the Temperature Test.SA11.3 With reference to SA11.1, when a thermal or overcurrent protective device operates during thetest, a shorting switch is to be connected across the protective device in the closed position. The externalresistor is to be adjusted for maximum resistance before being con
40、nected in the circuit. The externalSTANDARD NUMBER: UL 962 -4-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULresistor is to then be adjusted so that the power it dissipates is 15 watts as indicated by the wattmeterreading. The switch across t
41、he protective device is to then be opened and the time required for theprotective device to open is to be recorded. When the protective device opens the circuit in 5 seconds orless while the resistor is dissipating 15 watts, the first circuit point not capable of delivering more than 15watts has bee
42、n located.RATIONALE FOR DECISION:We are clarifying the intent of several items related to Class 2 / LPS circuits.We are clarifying requirements concerning polymeric materials in direct contact with live parts.Copyright 2018 UL LLCUL LLC, in performing its functions in accordance with its objectives,
43、 does not 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 UL LLC. in practically applying therequirements of the standard. They do not represent formal
44、interpretations of the standard underAmerican National 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
45、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 962 -5-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSTANDARD NUMBER: UL 962 -6-No Text on This Page
