1、C22.2 No. 209-M1985 Thermal Cut-Offs Environmental Products Forming Part of Canadian Electrical Code, Part II Safety Standards for Electrical Equipment ISSN 0317-5669 Published in July, 1985 by Canadian Standards Association Incorporated 1919 178 Rexdale Boulevard Rexdale (Toronto), Ontario Canada M
2、9W 1R3 Canadian Standards Association -2GeneralI nstruction No.2C22.2 No. 209-M1985February, 1986CSA Standard C22.2 No. 209-M1985, Thermal Cut-Offs, was published in July, 1985; itconsisted of 26 pages, each of which was dated July, 1985.An erratum to Clause 4.5.4/is incorporated (and identified by
3、a vertical line in themargin) in the attached replacement pages.CSA Standard C22.2 No. 209-M1985 now consists of the following pages:3-10,13-26 dated July, 1985;11 and 12 dated February, 1986.These replacement pages are to be inserted into your copy of the Standard; thepages replaced should be kept
4、for reference.Construction-Marking- Tests(b) catalogue, style, model, or other type desig-nation;(c) the complete electrical rating in volts and, asappropriate for the intended use, horsepower,amperes, volt amperes, or watts, or any combinationthereof, whether for ac or dc (or both) and the ratedfre
5、quency in hertz (if for ac)*; and(d) the rated functioning temperature identified inCelsius or Fahrenheit by a specific temperaturemarking or, alternatively, by a unique model or typenumber.* The electrical rating may be omitted owing to restrictionsin the size of the TCO if a different catalogue nu
6、mber isemployed for each electrical rating or if the TCO isspecifically designed as part of an appliance.5.2 DocumentationThe manufacturer shall make available a set ofapplication instructions that includes at least thefollowing:(a) the values T to T h and T m their meaning anduse;(b) handling and m
7、ounting instructions that willprevent damage to the TCO;(c) functioning temperature (T f) tolerance;(d) spacing to metal parts (see Clause 4.4);(e) application instructions for an SOD, whichshall describe conditions that may cause the deviceto reset;(f) complete electrical rating; and(g) suitability
8、 for sealing in or use with impreg-nating fluids or cleaning solvents.5.3The quarter and year of manufacture, as a minimum,shall be marked on the TCO, except that where thisis impracticable owing to size limitations, themarking may appear only on the package.Note: Date coding, serial numbers, or equ
9、ivalent meansmay be used.4.4 SpacingsThe spacings for a TCO shall be not less than thosespecified in Table 1. The spacings betweenelements of the operating mechanism (such ascontacts) are not defined, but acceptability isdetermined by the dielectric strength test specifiedin Clause 6.4.4.5 Means for
10、 Factory Calibration of anSOD4.5.1A means provided for factory calibration shall befactory secured to prevent unintentional shiftingafter calibration.4.5.2A means of calibration that is accessible or apparentafter installation shall be modified, guarded, orsealed by a means such as soldering or ceme
11、ntingto effectively prevent manipulation by hand or anordinary tool subsequent to factory calibration.4.5.3With reference to Clause 4.5.2, a calibration meansshall be considered not accessible or apparent if itdoes not show, is not exposed to manipulation by aconventional tool, or is not readily dis
12、placed.Complete concealment of a conventional tool-engaging means in a screw such as a slot, recessedhead, or the like by the use of solder, brazingmaterial, or cement acceptable for the purpose isadequate to prevent manipulation if the calibrationmeans cannot be changed readily by gripping with aco
13、nventional tool and engagement or manipulationis prevented at all other locations.4.5.4Enamel and other polymeric materials shall not beused to secure or seal the means of calibration at thefactory if they are exposed to temperatures higherthan 120C unless they have been subjected tothermal aging te
14、sts and have been found acceptablefor use at higher temperatures.6. Tests6. 1 General6.1.1Measurements of voltages and currents shall becarried out with instruments that do not appreciablyaffect the values measured. For ac, the test voltageshall be substantially sinusoidal with a frequencybetween 45
15、 and 62 Hz.5. Marking5.1A TCO shall be permanently marked with thefollowing:(a) manufacturers name, trademark, tradename,or other recognized symbol of identification;11Thermal Cut-OffsFebruary, 1986 (Replaces p. 1, July, 1985)Tests6.1.2Temperatures shall be measured to an accuracy ofat least :i:1C.
16、Temperature of ovens shall beconstant to within:i:1 C in the immediate area of thetest sample. Where temperature or rise in temper-ature is to be monitored on a TCO inside an oven, itshall be monitored by means of a 30 AWGthermocouple attached to an identical but non-functioning TCO mounted adjacent
17、 to the deviceunder test.6.1.3If the leads of a TCO require lengthening to undergoany tests, wire of the same gauge shall be attachedto the leads using a suitable method that achieves alow impedance junction, eg, welding or brazing.6. 1.4If a TCO is terminated in quick-connect or screwterminals, wir
18、e of the size specified in Table 7 shallbe attached using a suitable method that achieves alow impedance junction, eg, welding or brazing, tofacilitate testing.6.2 Overload6.2.1A TCO shall be placed in a test oven in whichthe temperature has been stabilized 10C belowthe minimum expected functioning
19、temperature. Atest current of the value specified in Tables 2,4, and5 at the voltage specified in Table 3 shall be appliedto the TCO under test and the temperature shallonce more be allowed to stabilize. Thetemperature of the oven shall then be raised at therate of 2 :i: 1C/min until the TCO functio
20、ns or theoven temperature reaches 30C above the max-imum rated functioning temperature. In the latterevent the TCO shall be considered unacceptable.Note: A suitable test fixture for use in a gravity type ovenis shown in Figure 1.6.2.2Forthe test specified in Clause 6.2.1, an unenclosedTCO shall be e
21、nclosed by a metal screen ofdimensions as specified by the manufacturer (seeClause 5.2(d). The screen shall be connectedthrough a 3 A fuse to ground.6.2.3During the test specified in Clause 6.2.1 the TCOshall function positively and there shall be nodamage to the integral leads of the TCO. The caseo
22、f an enclosed TCO shall remain intact to the extentthat there is no emission of flame or moltenmetal. The fuse required in Clause 6.2.2 shall notrupture. 6.2.4At the conclusion of the overload test the TCO shallbe subjected to the dielectric strength test specifiedin Clause 6.4.6.3 Transient Overloa
23、d Current6.3.1A TCO of the normally closed type shall besubjected to 100 dc current pulses, 3 ms wide(:t:10% at the 90% points), with an amplitude of15 times rated current (:t:5% of obtained current)applied at the rate of 6 per minute.6.3.2After the completion of the test each sample shall besubject
24、ed to the calibration verification testspecified in Clause 6.5 with acceptable results.6.4 Dielectric Strength6.4.1A TCO shall be capable of withstanding for 1 minwithout breakdown the application of(a) an ac voltage of 1000 V plus twice maximumrated voltage between supply leads or terminals andnon-
25、current-carrying metal parts; and(b) twice the rated voltage between leads orterminals of an open TCO.6.4.2Compliance of a TCO with the requirements ofClause 6.4.1 shall be determined by means of asuitable testing transformer the voltage of whichcan be regulated.Starting at zero, the applied voltage
26、 shall beincreased gradually and at a uniform rate until eitherthe required test value is reached or breakdownoccurs. Breakdown is considered to be a currentflow greater than 5 mA.C22.2 No. 209-M1985February, 1986 (Replaces p. 12, July, 1985)12General Instruction No. 1C22.2 No. 209-M1985July 1985Tit
27、le: Thermal Cut-OffsPagination: 26 pages, each dated July 1985To register for e-mail notification about any updates to this publicationgo to shop.csa.caclick on CSA Update ServiceThe List ID that you will need to register for updates to this publication is 2413893.If you require assistance, please e
28、-mail techsupportcsagroup.org or call 416-747-2233.Visit CSA Groups policy on privacy at csagroup.org/legal to find out how we protect your personal information.Contents Contents Technical Committee on Environmental Products 4 Subcommittee on C22.2 No. 209 6 Preface 7 Foreword 8 1. Scope 9 2. Defini
29、tions 9 3. General Requirements 10 3.1 General 10 3.2 Reference Publications 10 4. Construction 10 4.1 General 10 4.2 Materials 10 4.3 LeadsandTerminals 10 4.4 Spacings 11 4.5 Means for Factory Calibration of an SOD 11 5. Marking 11 6. Tests 11 6.1 General 11 6.2 Overload 12 6.3 Transient Overload C
30、urrent 12 6.4 Dielectric Strength 12 6.5 Calibration Verification 13 6.6 Holding Temperature (Th) (Thermal Link) 13 6.7 Maximum Temperature Limit (Tm) 13 6.8 Aging 13 6.9 Terminal and Lead Secureness 13 6.9.1 General 13 6.9.2 Tensile 14 6.9.3 Pushing 14 6.9.4 Twist 14 6.10 Crush (Thermal Links) 14 6
31、.11 Corrosion 14 6.12 Additional Tests for Single Operation Devices 14 Tables 16 Figures 22 Appendix ARecommended Number of Samples for Required Tests on Thermal Cut-Offs 26 Thermal Cut-Offs July, 1985 3 Technical Committee Technical Committee on Environmental Products D.H. Dunsire Manitoba Hydro, C
32、hairman Winnipeg Representing Regulatory Authorities R.L. Hicks Ontario Hydro, Vice-Chairman Toronto Representing Regulatory Authorities B. Dyczkowsky Canadian Standards Association, Standards Rexdale, Ontario Administrator, Nonvoting Representing Regulatory Authorities J.T. Kokotailo Saskatchewan D
33、epartment of Labour, Regina M. Riendeau Ministre de lHabitation et de Ia Protection du consommateur, Qubec, Qubec Representing Manufacturers B.C. Christie Manville Canada Inc., Brampton, Ontario J.F. Leeper Federal Pioneer Limited, Toronto, Ontario G. Longmuir Commander Electrical Equipment Inc., Sc
34、arborough, Ontario R. Wayman Trane Co. of Canada Ltd., Toronto, Ontario Representing General Interests S.K. Cryer Heating, Refrigerating and Air Conditioning Institute of Canada, lslington, Ontario n.E. Dowling Canadian Standards Association, Alternate Rexdale, Ontario 4 Technical Committee H.L.J. D
35、rummond The Research and Productivity Council, Fredericton, New Brunswick Consumer Representative J.E. Duncan Canadian Standards Association, Rexdale, Ontario I. Pasini Public Works Canada, Ottawa, Ontario Thermal Cut-Offs July, 1985 5 Subcommittee Subcommittee on C22.2 No. 209 J.F. Leeper Federal P
36、ioneer Limited, Chairman Toronto, Ontario A. Bal Canadian Standards Association, Rexdale, Ontario F.L. Coolen Nova Scotia Power Corporation, Halifax E.C. Goudge Commander Electrical Equipment Inc., Scarborough, Ontario I.H. Hosie Electrohome Limited, Cambridge, Ontario R.H. Jackson 3M Company, St. P
37、aul, Minnesota, USA J. Madeiros Elmwood Sensors, Cranston, Rhode sIand, USA J. Pallas Standard Appliance Manufacturing Co. Limited, Toronto, Ontario B. Singh Therm-O-Disc, Inc., Mansfield, Ohio, USA A.C. Tingley Canada Wire Cable Ltd., Don Mills, Ontario W. Travis Littelfuse Inc., Des Plaines, Illin
38、ois, USA R.N. Tucker Toronto, Ontario Consumer Representative R. Vore Emerson Electric Company, Dayton, Ohio, USA G.H. Sprentall Canadian Standards Association, Standards Rexdale, Ontario Administrator C22.2 No. 209-M1985 6 July, 1985 Preface Preface This is the first edition of No. 209 of a series
39、of Standards issued by the Canadian Standards Association under Part II of the Canadial Electrical Code. It is written in SI (metric) units. This Standard applies to a temperature(s) and current sensitive device that is intended for incorporation in other equipment and that is designed to open at a
40、predetermined temperature to prevent unsafe operation of the equipment as a result of overheating. This Standard is based on concepts established for CSA Standards C22.2 No. 24, 74, and 77 and IEC Publication 691 (Thermal Links). In addition to component requirements, additional tests have been spec
41、ified that deal with possible damage to the Thermal Cut-Off (TCO) during assembly in other products. Designers of TCOs are reminded that TCOs are used primarily as safety devices and, as such, are often called upon to operate only after extended periods of time. As no tests currently exist for evalu
42、ating materials that may be exposed to such conditions, designers are expected to exercise sound engineering judgment to select suitable materials. Users of TCOs should consider the new terms Th and Tm in determining suitability for specific applications. The user should be aware that the surroundin
43、gs of the TCOs in the application may differ from the surroundings prescribed in these tests. Therefore, it is recommended that TCOs be tested under the most severe conditions anticipated in order to determine the suitability of application. This Standard presumes that the TCO will be used in warm a
44、nd dry applications and this should also be considered. The Subcommittee strongly recommends that agencies certifying to the requirements of this Standard establish a re-examination program that continues to audit the compliance of the products to this Standard. For general information on the Standa
45、rds of the Canadian Electrical Code, Part II, see the preface of CSA Standard C22.2 No. 0, General RequirementsCanadian Electrical Code, Part II. This Standard was prepared by a Subcommittee of the Technical Committee on Environmental Products under the jurisdiction of the Standards Steering Committ
46、ee on CE Code, Part II, and was formally approved by these Committees. July, 1985 Note: Although the intended primary application of this Standard is stated in its Scope, it is important to note that it remains the responsibility of the user of the Standard to judge its suitability for his or her pa
47、rticular purpose. CSA Standards are subject to periodical review and suggestions for their improvement will be referred to the appropriate committee. All enquiries regarding this Standard, including requests for interpretation, should be addressed to Canadian Standards Association, Standards Divisio
48、n, 178 Rexdale Boulevard, Rexdale (Toronto), Ontario M9W 1R3. Requests for interpretation should (a) define the problem, making reference to a specific Clause, and, where appropriate, include an illustrative sketch; (b) provide an explanation of circumstances surrounding the actual field condition;
49、and (c) be phrased, where possible, to permit a specific “yes“ or “no“ answer. Interpretations are published in “CSA In formation Update“. For subscription details and a free sample copy, write to CSA Business Development Group or telephone (416) 747-4019. Thermal Cut-Offs July, 1985 7 Foreword Foreword Canadian Standards Association provides certification services for manufacturers who, under license from CSA, wish to use the appropriate registered CSA Marks on certain products of their manufacture to indicate conformity with CSA Standards. CSA Certification for a
