1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULMAY 21, 20181UL 4248-17Outline of Investigation for Fuseholders Part 17: Class CF FusesIssue Number: 2May 21, 2018Summary of TopicsThis second issue of the Outline of Investigation for Fuseholder
2、s Part17: Class CF Fuseholders, UL 4248-17, applies to Class CF fuseholdersrated 400 A or less and 600 V. Revisions include the expansion of thefuseholder ratings from 110 A to 400 A.ULs Outlines of Investigation are copyrighted by UL LLC. Neither a printed norelectronic copy of an Outline of Invest
3、igation should be altered in any way. All ofULs Outlines of Investigation and all copyrights, ownerships, and rights regardingthose Outlines of Investigation shall remain the sole and exclusive property of ULLLC.COPYRIGHT 2018 UL LLCUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORD
4、ISTRIBUTION WITHOUT PERMISSION FROM ULMAY 21, 2018UL 4248-172No Text 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 46 Marking 46.
5、1 Marking of fuseholder .47 Construction 57.6 Contacts of a cartridge fuseholder 58 Tests 88.1 General .88.4 Verification of temperature rise .8MAY 21, 2018 UL 4248-17 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL1 GeneralThis Outline of I
6、nvestigation 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 Clauses in Part 1. The requirements of Part 1 apply unless modifiedby this Part
7、. 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 with Class CF Fuses as described in theOutline of Investigation for Low-Voltage Fu
8、ses 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 divided into five body sizescorresponding to the Class CF fuse body sizes.5 Charac
9、teristics5.1 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, 100, 225 or 400 A.5.1.4 Withstand rating5.1.4.1 Class CF fuseholders shall have a short-circuit withstand rating of 200,000 A o
10、r 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;g) for panel mount and in-line fuseholders, line and load shall be marked, with the terminalrecessed furthest in the device
11、 designated as the line terminal.MAY 21, 2018UL 4248-174UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL7 Construction7.6 Contacts of a cartridge fuseholder7.6.1 The dimensions of a Class CF fuseholder shall be as specified in Figures 7.6A and
12、 7.6B.This is generated text for figtxt.MAY 21, 2018 UL 4248-17 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULThis is generated text for figtxt.Figure 7.6AClass CF 30, 60, 100A fuseholderClass of fusePotentialrating of fuse,voltsCurrent rat
13、ingof fuse,ampereDimensions of class CF fuseholder dimensions, mm (in) tolerance:0.5 (0.02)ABCDELength ofholderDistancebetween topand bottomWidth ofholderDistancebetweenblade slotBlade widthCF 60030 58.5 (2.30) 34.4 (1.35) 19.4 (0.76) 16.9 (0.67) 8.4 (0.33)60 66.1 (2.60) 40.6 (1.60) 26.2 (1.03) 16.9
14、 (0.67) 11.6 (0.46)100 73.8 (2.91) 50.9 (2.01) 26.7 (1.05) 16.4 (0.65) 14.7 (0.58)MAY 21, 2018UL 4248-176UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULFigure 7.6BClass CF 225, 400A fuseholderClass offusePotentialrating offuse,voltsCurrentrat
15、ing offuse,ampereDimensions of class CF fuse holder dimensions, mm(in) tolerance: 0.5 (0.02)ABCDEFGHLengthof fuseinterfaceHeight offuseinterfaceWidth offuseinterfaceDistancebetweenbladeslotBladewidthCenterFeaturewidthCenterFeatureLengthTopCenterFeatureLengthBottomCF 60022575.6(2.98)53.0(2.09)34.9(1.
16、37)38.0(1.50)16.6(0.65)1.50 (.06)10.40(.41)4.56 (.18)40089.4(3.52)56.4(2.22)43.7(1.72)38.0(1.50)21.9(0.86)1.42 (.06)10.26(.40)1.45 (.06)MAY 21, 2018 UL 4248-17 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL8 Tests8.1 General8.1.1 Types of t
17、ests8.1.1.1.1 Each fuseholder shall be subjected to the tests as specified in Part 1.8.4 Verification of temperature 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
18、 values in Table 8.4A.8.4.3.2 Dummy fuses shall be unplated copper and shall conform to the dimensions in Figure 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
19、 (68 104F).8.4.3.4 During a test conducted at an ambient temperature of 25C (77F), an observed temperature shallnot 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
20、in 8.4.3.6. Neither a corrected temperature nor an observed temperatureshall exceed the required value specified 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 25
21、C) of the difference between25C and the ambient temperature.8.4.3.7 If a corrected temperature exceeds the required value specified in Table 8.4A, at the request ofthe manufacturer, the test may be repeated at an ambient temperature closer to 25C (77F).This is generated text for figtxt.MAY 21, 2018U
22、L 4248-178UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULFigure 8.4ADimensions of Class CF fuses in mm (in)1 100ADIM mm (in) Tolerance 1A 30A 35 60A 70 100AA 0.25 (0.01) 44.45 (1.750) 50.80 (2.000) 73.20 (2.882)B 0.25 (0.01) 25.40 (1.000) 28.
23、58 (1.125) 32.00 (1.260)C 0.25 (0.01) 19.05 (0.750) 25.40 (1.000) 25.40 (1.000)D 0.25 (0.01) 16.92 (0.667) 16.94 (0.667) 16.49 (0.649)E 0.25 (0.01) 1.02 (0.040) 1.02 (0.040) 1.60 (0.063)F 0.25 (0.01) 4.07 (0.160) 4.07 (0.160) 5.58 (0.220)G 0.25 (0.01) 2.03 (0.080) 2.29 (0.090) 2.29 (0.090)H 0.25 (0.
24、01) 5.08 (0.200) 7.37 (0.290) 7.37 (0.290)I 0.25 (0.01) 14.73 (0.580) 20.07 (0.790) 20.07 (0.790)J 0.25 (0.01) 7.57 (0.298) 7.75 (0.305) 7.67 (0.302)K 0.25 (0.01) 11.63 (0.458) 11.81 (0.465) 13.54 (0.533)L 0.25 (0.01) 14.73 (0.580) 14.73 (0.580) 20.07 (0.790)M1 0.25 (0.01) 3.97 (0.156) 5.56 (0.219)
25、7.24 (0.285)M2 0.25 (0.01) 3.97 (0.156) 5.56 (0.219) 7.24 (0.285)N1 0.25 (0.01) 3.97 (0.156) 5.56 (0.219) 7.24 (0.285)N2 0.25 (0.01) 3.97 (0.156) 5.56 (0.219) 7.24 (0.285)P 0.25 (0.01) 3.97 (0.156) 3.97 (0.156) 4.40 (0.173)Internal Bus DummyCross section10% 19.4 (0.030) 71.2 (0.110) 126.6 (0.196)MAY
26、 21, 2018 UL 4248-17 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL110 400ADIM (in) Tolerance 110 225A 250 400AA MAX 74.93 (2.950) 88.90 (3.500)B MAX 60.71 (2.390) 67.11 (2.642)C1 MAX 34.54 (1.360) 43.43 (1.710)C2 0.25 (0.01) 31.41 (1.237)
27、40.75 (1.604)D 0.25 (0.01) 38.00 (1.496) 38.00 (1.496)E 0.25 (0.01) 4.00 (0.157) 4.00 (0.157)F 0.25 (0.01) 8.08 (0.318) 8.08 (0.318)G 0.25 (0.01) 4.50 (0.177) 8.72 (0.343)H 0.25 (0.01) 6.00 (0.236) 6.00 (0.236)J 0.25 (0.01) 2.50 (0.098) 2.50 (0.098)K 0.25 (0.01) 26.50 (1.043) 36.20 (1.425)L 0.25 (0.
28、01) 20.08 (0.791) 25.58 (1.007)M1 0.25 (0.01) 8.00 (0.315) 10.75 (0.423)M2 0.25 (0.01) 8.00 (0.315) 10.75 (0.423)N1 0.25 (0.01) 8.00 (0.315) 10.75 (0.423)N2 0.25 (0.01) 8.00 (0.315) 10.75 (0.423)P 0.25 (0.01) 4.00 (0.157) 4.00 (0.157)Q1 0.25 (0.01) 10.00 (0.394) 10.00 (0.394)Q2 0.25 (0.01) 4.40 (0.1
29、73) 4.40 (0.173)R 0.25 (0.01) 1.39 (0.055) 1.39 (0.055)S 1 50.0 50.0Internal Bus Dummy Crosssection10% 201.6 (0.313) 435.5 (0.675)MAY 21, 2018UL 4248-1710UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL8.4.4 Acceptability of test results8.4.4.
30、1 The temperature limits shown in Table 8.4A shall not be exceeded.Table 8.4AMaximum temperatureMaterials and componentsDegreesCFA. COMPONENTS1. Any bus, strap, or fuse clip, except as noted in item 2 55 1312. Any bus, strap, or fuse clip fuseholders rated 110 400A 90 1943. Line and load terminals e
31、xcept as noted in items 4 and 5 55a131a4. Line and load terminals fuseholders rated 110 400A 65a149a5. Line and load terminals fuseholders rated 100 amperes orless and marked for use with 60C wire60a140a6. Line and load terminals fuseholders rated 100 amperes orless and marked for use with 75C wire7
32、5a167aB. ELECTRICAL INSULATION GENERAL1. Wire insulation or insulating tubing 40b104b2. Electrical tape 60b140b3. Varnished cloth insulation 65b149b4. Fiber employed as electrical insulation 70b158b5. Sealing compound 55b131b6. Polymeric materials employed as electrical insulation or asa part the de
33、terioration of which would result in a risk of fire,electric shock, or injury to personsRTI-20cRTI-68caApplicable to a connector for copper wire; also applicable to a connector for aluminum wireor an aluminum-bodied connector if the connector has a temperature rating of 90C (194F).bThis limitation f
34、or an insulated conductor or other material that has been investigated andfound acceptable at a higher temperature less 20 degrees Celsius (to represent the additionalheating effect contributed by the use of the actual fuse).cRTI is the higher of the mechanical and electrical relative thermal indice
35、s for the polymericmaterial used or, for those materials lacking published RTI ratings, the generic thermal index,corresponding to the material used, as published in Annex B, Reference 8.MAY 21, 2018 UL 4248-17 11UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULMAY 21, 2018UL 4248-1712No Text on This Page
