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): SHZZStandard Number: UL 250Edition Date: November 1, 1993Edition Number: 10Section / Paragraph Reference: VariousSubject: Supercedes prior Certification Requ
3、irement Decision issued February 1,2007.DECISION:2.26 REFRIGERATED KITCHEN UNIT A unit consisting of a refrigerator in combination with any of thefollowing: a range, a microwave, and/or a sink, or both.a) rangeb) microwavec) sink4.5.15 For switches and other electrical components located in areas wh
4、ere disconnection of the leadswould result in exposure of an uninsulated live part or reduction of electrical spacings, a means forsimultaneous disconnection of the leads shall be provided.4.7.1 Except as indicated in 4.7.7, a door, drawer, or lid permitting entry into a refrigerated storage spaceth
5、at has a minor dimension of 203.2 mm (8 inches) or more and a volume of 0.06 m3(2 cubic feet) ormore, with any arrangement or removal of shelving, shall be constructed so that it will open easily fromthe inside by a force applied outwardly to the door, drawer, or to a release actuator. See door latc
6、h releasetest, Clause 8.28.4.10.1.2 Wiring shall have insulation rated for the potential involved and the temperature to which it maybe subjected. Compliance is to be judged on the basis of the temperatures measured during theapplicable temperature tests specified in Clauses 8.6 and 8.98.UL COPYRIGH
7、TED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 4.9 Typical wiringGroup Type of wire, cord, or cableaWire size Minimum Nominalinsulation thicknessmm2No. AWG mm InchA Appliance wiring material having thermoplasticinsulation, with nominal insulation
8、thicknessesshown at the right.3.3 0.82 5.3and smaller10 and smaller 0.8 0.686 2/64 0.027B Appliance wiring material having thermoplasticor thermoset insulation, with nominal insulationthicknesses shown at right.0.82 and smaller 18 and smaller 1.6 1.37d4/64 0.054d1.3 16 1.6 1.37d4/64 0.054d2.1 14 2.0
9、 1.70e5/64 0.067e3.3 12 2.0 1.70e5/64 0.067eC Appliance wiring material having rubberinsulation, with insulation thicknesses shown atthe right.Same as for Group BdTotal wire insulation thickness can be achieved by use of 0.8 69 mm (2/64 0.027 inch) insulation integral to the wire plus 0.869 mm (1/32
10、 0.027 inch) thick supplemental sleeving, such as fiberglass, etc.eTotal wire insulation thickness can be achieved by use of 1.203 mm (3/64 0.040 inch) insulation integral to the wire plus 0.869 mm (1/32 0.027 inch) thick supplemental sleeving, such as fiberglass, etc.5.8.5 A switching device that m
11、ay be called upon to break controls a motor load under locked rotorconditions of other than the clock motor type shall have a current interrupting capacity horsepower or anequivalent locked rotor ampere rating not less than the locked rotor current that of the motor to becontrolled. This may be a lo
12、cked rotor ampere (LRA) or equivalent horsepower rating.5.8.7 A switching device that controls an incandescent lamp or lamps shall be rated for the control oftungsten-filament lamps.Exception No. 1: A snap switch may be used to control a .Exception No. 2: An ac general-use snap switch may be used to
13、 control .A switching device is acceptable for use with tungsten-filament loads if it has a T, TV or L rating greaterthan or equal to the tungsten-filament lamp load. A general-use alternating current snap switch or a circuitbreaker are considered acceptable for controlling tungsten-filament lamps a
14、t their full ampacity. Aswitching device having an alternating current rating of ten times or more of the tungsten-filament lampload is also acceptable for use with that tungsten-filament lamp load without additional test.STANDARD NUMBER: UL 250 -2-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER
15、REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 8.2 Maximum acceptable temperaturesDevice or Material C FB.2 Field Wiring 75 187 167B.8 Wood or other Flammable Material 90 206 194D.4 Surfaces of Test Enclosure . 90 206 1948.25 Shelf and Drawer strength test8.28 Door latch release test8.2
16、8.1 An interior latch release device shall permit the door to open with a force of 66.7 N (15 poundsforce) or less applied at the rate of 13.3 17.8 N/s (3-4 pounds force per second). This test shall beconducted before and after the conditioning specified in Clauses 8.28.4 and 8.28.5. This test shall
17、 also beconducted on drawers which are accessible without opening a door or lid on the refrigerator.Exception: This requirement does not apply to units or drawers in which the storage space has a minordimension of less than 203.2 mm (8 inches) or a volume of less than 0.06 m3(2 cubic feet).10.1.1 Ea
18、ch refrigerator shall be tested and proved tight at not less than the designhighest pressure asdetermined during the temperature and pressure test, Clause 8.6, nor less than the following:For other refrigerants, the minimum designtest pressure shall not be less than the values recorded.Exception: A
19、method other than pressure testing at the design pressures determined above may beemployed if it can be demonstrated.10.2.5 Solid-state and similar. or the test may be conducted before the solid-state components areelectrically connected, providing.11.2.5 A child entrapment warning statement shall b
20、e included in either the operating instructions or in ause and care manual provided with each refrigerator with a food storage compartment larger than 0.06m3(2 cubic feet).RATIONALE FOR DECISION:Presently, UL 250 references a “nominal” insulation thickness for appliance wiring material. As thisthick
21、ness is not usually referenced on the AWM Style Page, the referenced thickness is being changed to“minimum” thickness, and appropriate values are being revised. In addition, UL has been testing drawersfor strength and entrapment requirements, so the term “drawer(s)” needs to be added to the appropri
22、atesections of the standard. Several editorial changes are also included.Copyright 2009 Underwriters Laboratories Inc.UL, 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 will
23、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 Standards Institute (ANSI) processes.
24、UL shall not be responsible toanyone for the use of or reliance upon Certification Requirement Decisions by anyone. UL shall not incurSTANDARD NUMBER: UL 250 -3-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULany obligation or liability for da
25、mages, 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 250 -4-
