1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULMarch 12, 20101SUBJECT 4248-17OUTLINE OF INVESTIGATIONFORFuseholders Part 17: Class CF FusesISSUE NO: 1March 12, 2010Summary of TopicsThis first issue of the Outline of Investigation for Fusehold
2、ers Part 17:Class CF Fuseholders, Subject 4248-17, applies to Class CF fuseholdersrated 100 A or less and 600 V.COPYRIGHT 2010 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULMARCH 12, 2010SUBJECT 4248-172No Text
3、on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTS1 General 41.1 Scope 44 Classification .45 Characteristics 45.1 Summary of characteristics .45.1.3 Voltage and current rating 45.1.4 Withstand rating .46 Marking 46.1 Marking
4、of fuseholder 47 Construction 57.6 Contacts of a cartridge fuseholder .58 Tests 58.1 General 58.1.1 Types of tests .58.4 Verification of temperature rise 58.4.3 Test method 58.4.4 Acceptability of test results 8MARCH 12, 2010 SUBJECT 4248-17 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPROD
5、UCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL1 GeneralThis Outline of Investigation is intended to be read together with the Standard for Fuseholders, - Part 1:General Requirements, UL 4248-1 hereafter referred to as Part 1. The numbering of the Clauses in thisPart corresponds to like numbered Cl
6、auses in Part 1. The requirements of Part 1 apply unless modifiedby this Part. For Clauses not shown below, refer to the Standard for Fuseholders - Part 1: GeneralRequirements, NMX-J-009-4248-ANCE CSA C22.2 No. 4248.1 UL 4248-1.1.1 Scope1.1.2 These requirements cover fuseholders intended for use wit
7、h Class CF Fuses as described in theOutline of Investigation for Low-Voltage Fuses - Part 17: Class CF Fuses, UL 248-17.4 Classification4.1 Class CF fuseholders have a short-circuit withstand rating of 200,000 A or 300,000 A at themanufacturers option. Class CF fuseholders are rated 600 V, and are d
8、ivided into three body sizescorresponding to the Class CF fuse body sizes.5 Characteristics5.1 Summary of characteristics5.1.3 Voltage and current rating5.1.3.1 Class CF fuseholders shall be rated 600 V.5.1.3.2 Class CF fuseholders shall be rated 30, 60, or 100 A.5.1.4 Withstand rating5.1.4.1 Class
9、CF fuseholders shall have a short-circuit withstand rating of 200,000 A or 300,000 A at themanufacturers option.6 Marking6.1 Marking of fuseholder6.1.1.1 In addition to the requirements of Part 1: the fuseholder shall be marked:f) Use Class CF Fuses; andg) for panel mount and in-line fuseholders, “l
10、ine” and “load” shall be marked, with the terminalrecessed furthest in the device designated as the line terminal.MARCH 12, 2010SUBJECT 4248-174UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL7 Construction7.6 Contacts of a cartridge fuseholde
11、r7.6.1 The dimensions of a Class CF fuseholder shall be as specified in Figure 7.6A.Class of fusePotential ratingof fuse, voltsCurrent ratingof fuse,amperesDimensions of class CF fuseholder dimensions, mm (in)ABCDLength ofholderDistancebetween topand bottomWidth of holderDistancebetween bladeslotCF
12、600 30 58.5 (1.35) 34.2 (2.30) 19.3 (0.76) 16.9 (0.67)60 66.1 (2.60) 40.6 (1.60) 26.2 (1.03) 16.9 (0.67)100 73.8 (2.91) 50.9 (2.00) 26.8 (1.06) 16.4 (0.65)8 Tests8.1 General8.1.1 Types of tests8.1.1.1.1 Each fuseholder shall be subjected to the tests as specified in Part 1.8.4 Verification of temper
13、ature rise8.4.3 Test method8.4.3.1 With dummy fuses in place and carrying rated current continuously, the temperature on a materialor component or electrical insulation shall not exceed the values in Table8.4A.8.4.3.2 Dummy fuses shall be unplated copper and shall conform to the dimensions in Figure
14、 8.4A.8.4.3.3 The temperatures specified in Table 8.4A 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 During a test conducted at an ambient temperature of 25C (77F), an observed temperature s
15、hallnot exceed the required value specified in Table 8.4A.8.4.3.5 If a test is conducted at an ambient temperature other than 25C (77F), an observed temperatureshall be corrected as described in 8.4.3.6. Neither a corrected temperature nor an observed temperatureshall exceed the required value speci
16、fied in Table 8.4A.8.4.3.6 An observed temperature shall be corrected by addition if the ambient temperature is lower than25C (77F) or subtraction (if the ambient temperature is higher than 25C) of the difference between25C and the ambient temperature.8.4.3.7 If a corrected temperature exceeds the r
17、equired value specified in Table 8.4A, at the request ofthe manufacturer, the test may be repeated at an ambient temperature closer to 25C (77F).MARCH 12, 2010 SUBJECT 4248-17 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULFigure 7.6AClass C
18、F 30, 60 and 100 A fuseholderMARCH 12, 2010SUBJECT 4248-176UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULFigure 8.4ADimensions of Class CF fuses in mm (in)Fuse AmpacityDIM (in) Tolerance 1A15A 17.5A20A25A30A 35A40A 45A50A 60A 70A 80A90A 100A
19、A 0.005 1.750 1.750 1.750 2.000 2.000 2.000 2.882 2.882 2.882B 0.005 1.000 1.000 1.000 1.125 1.125 1.125 1.260 1.260 1.260C 0.005 0.750 0.750 0.750 1.000 1.000 1.000 1.000 1.000 1.000D 0.005 0.667 0.667 0.667 0.667 0.667 0.667 0.645 0.645 0.645E 0.005 0.040 0.040 0.040 0.040 0.040 0.040 0.063 0.063
20、0.063F 0.005 0.160 0.160 0.160 0.160 0.160 0.160 0.220 0.220 0.220G 0.005 0.080 0.080 0.080 0.090 0.090 0.090 0.090 0.090 0.090H 0.005 0.200 0.200 0.200 0.290 0.290 0.290 0.290 0.290 0.290I 0.005 0.580 0.580 0.580 0.790 0.790 0.790 0.790 0.790 0.790J 0.005 0.300 0.300 0.300 0.300 0.300 0.300 0.300 0
21、.300 0.300K 0.005 0.458 0.458 0.458 0.465 0.465 0.465 0.533 0.533 0.533L 0.005 0.580 0.580 0.580 0.580 0.580 0.580 0.790 0.790 0.790M1 0.002 0.115 0.156 0.156 0.179 0.219 0.219 0.245 0.285 0.285M2 0.002 0.115 0.115 0.156 0.179 0.179 0.219 0.245 0.245 0.285N1 0.002 0.115 0.115 0.156 0.179 0.179 0.219
22、 0.245 0.285 0.285N2 0.002 0.115 0.156 0.156 0.179 0.219 0.219 0.245 0.245 0.285P 0.002 0.156 0.156 0.156 0.156 0.156 0.156 0.156 0.156 0.156MARCH 12, 2010 SUBJECT 4248-17 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL8.4.4 Acceptability of
23、 test results8.4.4.1 The temperature limits shown in Table 8.4A shall not be exceeded.Table 8.4AMaximum temperatureMaterials and componentsDegreesCFA. COMPONENTS1. Line and load terminalsmarked for use with75C wire75 1402. Line and load terminalsmarked for use with60C wire60 140B. ELECTRICAL INSULAT
24、ION - GENERAL1. Wire insulation orinsulating tubing40a104a2. Electrical tape 60a140a3. Varnished clothinsulation65a149a4. Fiber employed aselectrical insulation70a158a5. Sealing compound 55a131a6. Polymeric materialsemployed as electricalinsulation or as a partthe deterioration ofwhich would result
25、in arisk of fire, electricshock, or injury topersonsRTI-20bRTI-68baThis limitation for an insulated conductor or other material that has been investigated and found acceptable at a highertemperature shall be that higher temperature less 20 degrees Celsius (to represent the additional heating effect
26、contributed bythe use of actual fuses).bRTI is the higher of the mechanical and electrical relative thermal indices for the polymeric material used or, for thosematerials lacking published RTI ratings, the generic thermal index, corresponding to the material used, as published in Annex B,Reference 8.MARCH 12, 2010SUBJECT 4248-178
