CSA C22 2 NO 106-2005 HRC-Miscellaneous fuses (Fifth Edition).pdf

1、C22.2 No. 106-05(reaffirmed 2014)HRC-Miscellaneous fusesLegal Notice for StandardsCanadian Standards Association (operating as “CSA Group”) develops standards through a consensus standards development process approved by the Standards Council of Canada. This process brings together volunteers repres

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16、he CSA Directives and guidelines governingstandardization and are published in CSAs periodical Info Update, which is available on the CSA Web site atwww.csa.ca.C22.2 No. 106-05 Canadian Standards Associationviii December 2005ForewordThe Canadian Standards Association (CSA) develops standards under t

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28、. Canadian Standards Association HRC-Miscellaneous fusesDecember 2005 1C22.2 No. 106-05HRC-Miscellaneous fuses1ScopeThis Standard applies to HRC non-renewable cartridge current-limiting fuses of the HRCI-MISC (Form I) type rated 600 A or less and 600 V ac or less, and to HRC non-renewable cartridge

29、current-limiting fuses of the HRCII-MISC (Form II) type rated 1200 A or less and 600 V ac or less, that are intended to be used in accordance with the Canadian Electrical Code, Part I.2 Reference publicationsThis Standard refers to the following publications, and where such reference is made, it sha

30、ll be to the edition listed below, including all amendments published thereto.CSA (Canadian Standards Association)C22.1-02Canadian Electrical Code, Part ICAN/CSA-C22.2 No. 0-M91 (R2001)General requirements Canadian Electrical Code, Part IICAN/CSA-C22.2 No. 248 series of Standards:CAN/CSA-C22.2 No. 2

31、48.1-00Low-voltage fuses Part 1: General requirements3 DefinitionsThe following definitions apply in this Standard:Arcing time the time from the instant the fuse element or link has melted and arcing is initiated until final circuit interruption by the fuse.Clearing time the time from the beginning

32、of an overcurrent to the final circuit interruption. The clearing time is equal to the sum of the melting time and the arcing time.Current-limiting fuse a fuse that, within a specified overcurrent range, limits the clearing time at rated voltage to an interval equal to or less than the first major o

33、r symmetrical current loop duration, and limits the peak current to a value less than the available peak current.Current-limiting range the range of prospective currents from the threshold current to the interrupting current rating of a current-limiting fuse.Current rating (In) the nominal root-mean

34、-square (rms) ac or dc ampere rating, based on specified conditions, that is assigned to a fuse.Dummy a copper bar of specified dimensions used to calibrate equipment for temperature testing HRCII-MISC fuses.HRC (high-rupturing capacity) fuse a fuse with an interrupting rating of at least 100 kA rms

35、 symmetrical.C22.2 No. 106-05 Canadian Standards Association2 December 2005Interrupting rating the highest prospective root-mean-square (rms) symmetrical alternating current or direct current that a fuse will safely interrupt under specified conditions verified by operation at rated voltage tests.I2

36、t (amperes-squared-seconds) a measure of heat energy developed during fuse interruption from the initiation of an overcurrent until the fuse clears the circuit. I2stands for the square of the effective (rms) let-through current and t stands for the time of current flow in seconds. The term I2t also

37、applies during the melting or arcing portions of the clearing time and is referred to as melting or arcing I2t, respectively. Clearing I2t is the sum of melting I2t and arcing I2t.Note: In this Standard, only the term clearing I2t is used.Maximum energy the test condition in the current-limiting ran

38、ge in which the maximum amount of heat is generated in the fuse before clearing.Melting time the time from initiation of a specified overcurrent to the instant when arcing of the element begins.Peak let-through current (Ip) the maximum instantaneous current through a fuse during interruption in its

39、current-limiting range.Prospective current the current that would flow in a circuit if a fuse in the circuit were replaced by a shorting bar of negligible impedance. The prospective current is also referred to as the available current and is the numerical value to which the interrupting rating, I2t,

40、 and peak let-through current are normally referred.Recovery voltage the normal frequency rms or direct current voltage impressed on a fuse after a circuit has been interrupted and high-frequency transients have subsided.Threshold current the lowest prospective rms symmetrical current above which a

41、fuse is current limiting.Threshold ratio the threshold current divided by the fuse rating.Time-delay fuse a fuse that will withstand a specified multiple value of rated current for a specified time interval without opening.Type D fuse a time-delay and low-melting-point fuse.Type P fuse a low-melting

42、-point fuse.4 General requirementsGeneral requirements applicable to this Standard are given in CAN/CSA-C22.2 No. 0. 5Construction5.1 General5.1.1Connections between the element and the contacts of a fuse shall maintain permanent electrical contact. The connection shall be soldered, brazed, welded,

43、or otherwise made permanently secure.5.1.2The body of a fuse shall be made of ceramic, impregnated glass fibre, or vulcanized fibre. Other materials may be used if an investigation determines that they are acceptable for their intended purpose. Canadian Standards Association HRC-Miscellaneous fusesD

44、ecember 2005 35.1.3For paper tubes, the investigation specified in Clause 5.1.2 shall include conducting the test described in Clause 7.4 on samples that have been conditioned in an oven at 90 C for 24 h, except that if the element melting temperature is below 90 C, the oven temperature shall be red

45、uced to a value 5 C below the element melting temperature and the aging time shall be increased to the value represented by the intersection of the oven temperature and the temperature index line in Figure 1.Figure 1Aging time versus aging temperature for paper tubes(See Clause 5.1.3.)Temperatureind

46、ex lineOven temperature, oCAging time, h1010 0001 00010010100C22.2 No. 106-05 Canadian Standards Association4 December 20055.1.4Contacts shall be held in substantial alignment by means other than friction between surfaces unless the press-fitted assembly is not subject to shrinkage or warping caused

47、 by heat or moisture.5.1.5Current-carrying parts shall be made of copper, brass, or another non-ferrous metal.5.1.6Iron or steel parts shall be protected against corrosion.5.2 Characteristics5.2.1 General5.2.1.1HRCI-MISC and HRCII-MISC fuses shall have an interrupting rating of 200 kA rms symmetrica

48、l.5.2.1.2The dimensions of an HRCI-MISC or HRCII-MISC fuse shall be such that the fuse will not fit within an envelope (space) 14.3 14.3 63.5 mm in size.Note: It is not the intent of this Standard to specify the dimensions of the fuses themselves.5.2.1.3HRCI-MISC and HRCII-MISC fuses shall not be in

49、terchangeable with any other fuses specified in this Standard or in the CAN/CSA-C22.2 No. 248 series of Standards.5.2.2 HRCI-MISC fuses5.2.2.1HRCI-MISC fuses shall be rated 600 A or less at 600 V ac or less.5.2.2.2HRCI-MISC Type P and D fuses shall comply with the applicable requirements specified in Clauses 7.3.3.4 and 7.3.4.2.5.2.3 HRCII-MISC fusesHRCII-M