ANSI UL 4248-5-2007 UL Standard for Safety Fuseholders C Part 5 Class G (First Edition Reprint with Revisions Through and Including April 4 2018)《熔断器支架安全标准.第5部分 G类》.pdf

1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 4248-5 Fuseholders Part 5: Class GUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER

2、 REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Fuseholders Part 5: Class G, UL 4248-5 First Edition, Dated February 28, 2007 Summary of Topics This revision to ANSI/UL 4248-5 is being issued to update the UL approval date per a UL Standards reaffirmation of ANSI/

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10、HOUT PERMISSION FROM UL Association of Standardization and Certication NMX-J-009/4248/5-ANCE First Edition CSA Group CSA C22.2 No. 4248.5-07 First Edition Underwriters Laboratories Inc. UL 4248-5 First Edition Fuseholders Part 5: Class G February 28, 2007 (Title Page Reprinted: December 21, 2012) AN

11、SI/UL 4248-5-2007 R(2012)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Commitment for Amendments This standard is issued jointly by the Association of Standardization and Certication (ANCE), the Canadian Standards Association (operating as

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20、IAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS Preface .4 1 General 6 1.1 Scope .6 4 Classication .6 5 Characteristics 6 5.1 Summary of characteristics 6 6 Marking 6 6.1 Marking of fuseholders 6 7 Construction 7 7.6 Contacts of a cartridge fuseholder

21、7 8 Tests 9 8.1 General .9 8.4 Verication of temperature rise .9 FEBRUARY 28, 2007 NMX-J-009/4248/5-ANCE CSA C22.2 NO. 4248.5-07 UL 4248-5 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Preface This is the common ANCE, CSA Group, and UL st

22、andard for Fuseholders Part 5: Class G. It is the rst edition of NMX-J-009/4248/5-ANCE, the rst edition of CSA C22.2 No. 4248-5, and the rst edition of UL 4248-5. This common standard was prepared by the Association of Standardization and Certication (ANCE), CSA Group, and Underwriters Laboratories

23、Inc. (UL). The efforts and support of the CANENA Technical Harmonization Subcommittee 32B Fuseholders are gratefully appreciated. This standard is considered suitable for use for conformity assessment within the stated scope of the standard. This standard was reviewed by the CSA Subcommittee on Low

24、voltage fuses, under the jurisdiction of the CSA Technical Committee on Industrial Products and the CSA Strategic Steering Committee on Requirements for Electrical Safety, and has been formally approved by the CSA Technical Committee. This standard will be submitted to the Standards Council of Canad

25、a for approval as a National Standard of Canada. This standard has been approved by the American National Standards Institute (ANSI) as an American National Standard. A UL standard is current only if it incorporates the most recently adopted revisions, all of which are itemized on the transmittal no

26、tice that accompanies the latest set of revised requirements. Where reference is made to a specic number of samples to be tested, the specied number shall be considered a minimum quantity. Note: Although the intended primary application of this standard is stated in its scope, it is important to not

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28、ontent except for national differences resulting from conicts in codes and governmental regulations. Presentation is word for word except for editorial changes. Interpretations The interpretation by the standards development organization of an identical or equivalent standard is based on the literal

29、 text to determine compliance with the standard in accordance with the procedural rules of the standards development organization. If more than one interpretation of the literal text has been identied, a revision is to be proposed as soon as possible to each of the standards development organization

30、s to more accurately reect the intent. ANCE effective date The effective date for ANCE will be announced through the Diario Ocial de Ia Federacin (Official Gazette) and is indicated on the cover page. DECEMBER 21, 2012 NMX-J-009/4248/5-ANCE CSA C22.2 NO. 4248.5-07 UL 4248-5 4UL COPYRIGHTED MATERIAL

31、NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CSA Group effective date The effective date for CSA Group will be announced through CSA Informs or a CSA Group certication notice. UL effective date As of November 2, 2009 all products Listed or Recognized by UL must

32、comply with the requirements in this standard Between February 28, 2007 and November 2, 2009, new product submittals to UL may be evaluated under all requirements in this standard or, if requested in writing, evaluated under presently effective requirements only. The presently effective requirements

33、 are contained in the tenth edition of UL 512. A UL effective date is one established by Underwriters Laboratories Inc. and is not part of the ANSI approved standard. DECEMBER 21, 2012 NMX-J-009/4248/5-ANCE CSA C22.2 NO. 4248.5-07 UL 4248-5 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODU

34、CTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Fuseholders Part 5: Class G 1 General This Part is intended to be read together with the Standard for Standard for Fuseholders, Part 1: General Requirements, hereafter referred to as Part 1. The numbering of the Clauses in this Part corresponds to lik

35、e numbered Clauses in Part 1. The requirements of Part 1 apply unless modied by this Part. For Clauses not shown below, refer to the Standard for Fuseholders Part 1: General Requirements, NMX-J-009-4248-ANCE CSA C22.2 No. 4248.1 UL 4248-1. 1.1 Scope 1.1.2 These requirements cover fuseholders intende

36、d for use with Class G Fuses as described in NMX-J-009/248/5-2000-ANCE, CSA C22.2 No. 248.5, UL 248-5, Low-Voltage Fuses Part 5: Class G Fuses. 4 Classication 4.1 Class G fuseholders have a short-circuit withstand rating of 100,000 A. Class G fuseholders are rated 480 V or 600 V, and have four body

37、sizes corresponding to the Class G fuse body size. 5 Characteristics 5.1 Summary of characteristics 5.1.3 Voltage and current rating 5.1.3.1 Class G fuseholders shall be rated 480 or 600 V. 5.1.3.2 Class G fuseholders shall be rated 15, 20 A (600 V); 30, 60 A (480 V). 5.1.4 Withstand rating 5.1.4.1

38、Class G fuseholders shall have a short-circuit withstand rating of a 100,000 A. 6 Marking 6.1 Marking of fuseholders 6.1.1.1 In addition to the requirements of Part 1, the fuseholder shall be marked: f) Use Class G Fuses ; g) For panel mount and in-line fuseholders, “line” and ”load” shall be marked

39、, with the terminal recessed furthest in the device designated as the line terminal; and h) “DO NOT OPERATE UNDER LOAD” or equivalent for fuseholders of the modular design where the fuse is inserted or removed by use of a carrier. FEBRUARY 28, 2007 NMX-J-009/4248/5-ANCE CSA C22.2 NO. 4248.5-07 UL 42

40、48-5 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 7 Construction 7.6 Contacts of a cartridge fuseholder 7.6.1 The dimensions of a Class G fuseholder shall be as specied in Figure 7.6A. This is generated text for gtxt. FEBRUARY 28, 2007 N

41、MX-J-009/4248/5-ANCE CSA C22.2 NO. 4248.5-07 UL 4248-5 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Figure 7.6A Class G fuseholder Ferrule contact type Note: Tabs shown are a typical end-stop conguration. Class of fuse Potential rating o

42、f fuse, volts Current rating of fuse, amperes Dimensions, mm (in) BCD G Distance between contact clips Minimum width of contact clip Diameter of ferrule Distance between end stops Minimum Maximum G 600 15 19.05 (0.750) a 7.75 (0.305) 10.312 (0.406) 34.16 (1.345) 34.67 (1.365) 20 b 21.41 (0.843) a,b

43、7.75 (0.305) 10.312 (0.406) 36.58 (1.440) 37.08 (1.460) 480 30 29.46 (0.62) a 7.75 (0.305) 10.312 (0.406) 42.16 (1.6) 43.18 (1.7) 60 31.75 (1.250) a 12.7 (0.5) 10.312 (0.406) 57.94 (2.281) 60.32 (2.375) a Tolerances for the B dimensions are: 60 amperes or less: plus 0.79 mm (0.031 in) and minus 1.57

44、 mm (0.062 in) b Minus tolerance may be 3.96 mm (0.156 in) FEBRUARY 28, 2007 NMX-J-009/4248/5-ANCE CSA C22.2 NO. 4248.5-07 UL 4248-5 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 8 Tests 8.1 General 8.1.1 Types of tests 8.1.1.1.1 Each fus

45、eholder shall be subjected to the tests as specied in Part 1. 8.4 Verication of temperature rise 8.4.3 Test method 8.4.3.1 With dummy fuses in place and carrying rated current continuously, the temperature on a material or component or electrical insulation shall not exceed the values in Table 8.4B.

46、 8.4.3.2 Dummy fuses shall be unplated copper and shall conform to the dimensions in Table 8.4A. 8.4.3.3 The temperatures specied in Table 8.4B are based on an assumed ambient temperature of 25C (77F). A test may be conducted at an ambient temperature within the range of 20 40C (68 104F). 8.4.3.4 Du

47、ring a test conducted at an ambient temperature of 25C (77F), an observed temperature shall not exceed the required value specied in Table 8.4B. 8.4.3.5 If a test is conducted at an ambient temperature other than 25C (77F), an observed temperature shall be corrected as described in Clause 8.4.3.4. N

48、either a corrected temperature nor an observed temperature shall exceed the required value specied in Table 8.4B. 8.4.3.6 An observed temperature is to be corrected by addition if the ambient temperature is lower than 25C (77F) or subtraction (if the ambient temperature is higher than 25C) of the di

49、fference between 25C and the ambient temperature. 8.4.3.7 If a corrected temperature exceeds the required value specied in Table 8.4B, at the request of the manufacturer, the test may be repeated at an ambient temperature closer to 25C (77F). Table 8.4A Dimensions of dummy fuses Rating in amperes Class of fuse Shape Dimensions, mm (in) Outside diameter Wall thickness Length 15 G Tube