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1、FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION Subject 248T (4248-6) May 26, 2006 SUMMARY OF TOPICS The UL 4248-6 standard is Part 6 for a harmonized trinational set of standards developed to complement the harmonized trinational UL 248 series of standards in that it consists of a Par
2、t 1 containing General Requirements applicable to all fuseholders and 8 subsequent Parts specifi c to a corresponding single Class of fuseholder. This bulletin supersedes the bulletin dated May 19, 2006. STP BALLOTS DUE: July 31, 2006 COMMENTS DUE: July 31, 2006 1. The UL 4248 series of standards is
3、 a harmonized trinational set of standards developed to complement the harmonized trinational UL 248 series of standards in that it consists of a Part 1 containing General Requirements applicable to all fuseholders and 8 subsequent Parts specifi c to a corresponding single Class of fuseholder. This
4、bulletin supersedes the bulletin dated May 19, 2006. BACKGROUND The UL 4248 family of Standards has been developed primarily to provide a tri-nationally harmonized (United States, Canada and Mexico) set of requirements for fuseholders. The UL 4248 series of Standards has been designed to complement
5、the UL 248 family of Standards in that it consists of a Part 1 containing General Requirements applicable to all fuseholders and 8 subsequent Parts specifi c to a corresponding single Class of fuseholder. RATIONALE The actual technical requirements; Construction, Performance and Marking remain funda
6、mentally the same as those contained in UL 512, upon which the UL 4248 family is based. There are, however, some technical differences that have been incorporated into these Standards. These include: The exclusive use of dummy fuses, in lieu of actual fuses, in the performance testing of fuseholders
7、. The use of dummy fuses will increase the consistency of test results by removing the effects of fuse-to-fuse performance variations. The provision of requirements for the use of polymeric materials in the construction of fuseholders. The requirement of a 5 ma. limit for leakage current through an
8、open fuse indicator or indicating circuit. Provision of a mechanism for the evaluation of the degree of electric shock protection provided by fuseholders marked with IP codes. Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130 Not
9、 for Resale, 08/29/2006 21:53:19 MDTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION PROPOSAL 1 General This Part is intended to be read together with the Standard for Fuseholders Part 1: General Requirements, hereaf
10、ter referred to as Part 1. The numbering of the Clauses in this Part corresponds to like numbered Clauses in Part 1. The requirements of Part 1 apply unless modifi ed by this Part. For Clauses not shown below, refer to the Standard for Fuseholders Part 1: General Requirements, NMX-J-009-4248-ANCECSA
11、 C22.2 No. 4248.1UL 4248-1. 1.1 Scope 1.1.2 These requirements cover fuseholders intended for use with Class H Fuses as described in NMX-J-009/248/6-2000-ANCE, CSA C22.2 No. 248.6, UL 248-6, Low-Voltage Fuses Part 6: Class H Non-Renewable; and NMX-J-009/248/7-2000-ANCE,CSA C22.2 No. 248.7, UL 248-7,
12、 Low-Voltage Fuses Part 7: Class H Renewable Fuses. 4 Classifi cation 4.1 Class H fuseholders have a short-circuit withstand rating of 10,000 A. Class H fuseholders are rated 250 V or 600 V, and are divided into six body sizes in each voltage rating corresponding to the Class H fuse body sizes. 5 Ch
13、aracteristics 5.1 Summary of characteristics 5.1.3 Voltage and current rating 5.1.3.1 Class H fuseholders shall be rated 250 or 600 V. 5.1.3.2 Class H fuseholders shall be rated 30, 60, 100, 200, 400, or 600 A . 5.1.4 Withstand rating 5.1.4.1 Class H fuseholders shall have a short-circuit withstand
14、rating of a 10,000 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 Use Class H Fuses. 7 Construction 7.6 Contacts of a cartridge fuseholder 7.6.1 The dimensions of a Class H fuseholder shall be as specifi ed in Figure 7.6A or
15、7.6B, whichever is applicable. This is generated text for fi gtxt. MAY 26, 2006SUBJECT 248T-2- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130 Not for Resale, 08/29/2006 21:53:19 MDTNo reproduction or networking permitted witho
16、ut license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION Figure 7.6A Class H fuseholder Ferrule-contact type Tabs shown are a typical end-stop confi guration. Class of fuse Potential rating of fuse, volts Current rating of fuse, amperes Dimensions, mm (in) BCDEG Distan
17、ce a between contact clips Minimum width of contact clip Diameter of ferrule Thickness of blade Distance between end stops MinimumMaximum H 250 3025.4 (1.0)12.7 (0.5)14.27 (0.562)51.59 (2.031) 53.97 (2.125) 6044.45 (0.750) 15.88 (0.625) 20.62 (0.812)76.99 (3.031) 79.38 (2.125) 100101.6 (4.0)22.22 (0
18、.875)3.18 (0.125) 200114.3 (4.5)31.75 (1.250)4.75 (0.187) 400127.0 (5.0)44.45 (1.750)6.35 (0.250) 600152.4 (6.0)53.97 (2.125)6.35 (0.250) 60030101.6 (4.0)12.7 (0.5)20.62 (0.812)127.79 (0.31)130.17 (5.312) 60107.95 (4.250) 15.88 (0.625) 26.97 (1.062)127.00 (0.531) 142.88 (5.63) 100152.4 (6.0)22.22 (0
19、.875)3.18 (0.125) 200177.8 (7.0)31.75 (1.250)4.75 (0.187) 400203.2 (8.0)44.45 (1.750)6.35 (0.250) 600228.6 (9.0)53.97 (2.125)6.35 (0.250) a Tolerances for the B dimensions are: 60 A or less:plus 0.79 mm (0.31 in) and minus 1.57 mm (0.62 in); 100 and 200 amperes:plus 1.57 mm (0.62 in) and minus 0.79
20、mm (0.31 in); 400 and 600 amperes:plus 2.36 mm (0.093 in). MAY 26, 2006SUBJECT 248T-3- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130 Not for Resale, 08/29/2006 21:53:19 MDTNo reproduction or networking permitted without licen
21、se from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION Figure 7.6B Class H fuseholder Knife-blade type Class of fuse Potential rating of fuse, volts Current rating of fuse, amperes Dimensions, mm (in) BCDEG Distance a between contact clips Minimum width of contact clip Diame
22、ter of ferrule Thickness of blade Distance between end stops MinimumMaximum H 250 3025.4 (1.0)12.7 (0.5)14.27 (0.562)51.59 (2.031) 53.97 (2.125) 6044.45 (0.750) 15.88 (0.625) 20.62 (0.812)76.99 (3.031) 79.38 (2.125) 100101.6 (4.0)22.22 (0.875)3.18 (0.125) 200114.3 (4.5)31.75 (1.250)4.75 (0.187) 4001
23、27.0 (5.0)44.45 (1.750)6.35 (0.250) 600152.4 (6.0)53.97 (2.125)6.35 (0.250) 60030101.6 (4.0)12.7 (0.5)20.62 (0.812)127.79 (0.31)130.17 (5.312) 60107.95 (4.250) 15.88 (0.625) 26.97 (1.062)127.00 (0.531) 142.88 (5.63) 100152.4 (6.0)22.22 (0.875)3.18 (0.125) 200177.8 (7.0)31.75 (1.250)4.75 (0.187) 4002
24、03.2 (8.0)44.45 (1.750)6.35 (0.250) 600228.6 (9.0)53.97 (2.125)6.35 (0.250) aTolerances for the B dimensions are: 60 A or less:plus 0.79 mm (0.31 in) and minus 1.57 mm (0.62 in); 100 and 200 amperes:plus 1.57 mm (0.62 in) and minus 0.79 mm (0.31 in); 400 and 600 amperes:plus 2.36 mm (0.093 in). MAY
25、26, 2006SUBJECT 248T-4- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130 Not for Resale, 08/29/2006 21:53:19 MDTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTS
26、IDE DISTRIBUTION 8 Tests 8.1 General 8.1.1 Types of tests 8.1.1.1.1 Each fuseholder shall be subjected to the tests as specifi ed in Part 1. 8.4 Verifi cation 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 materia
27、l or component or electrical insulation shall not exceed the values in Table 8.4B. 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 specifi ed in Table 8.4B are based on an assumed ambient temperature of 25C (77F). A test may be
28、 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 shall not exceed the required value specifi ed in Table 8.4B. 8.4.3.5 If a test is conducted at an ambient temperature other than
29、 25C (77F), an observed temperature shall be corrected as described in Clause 8.4.3.6. Neither a corrected temperature nor an observed temperature shall exceed the required value specifi ed in Table 8.4B. 8.4.3.6 An observed temperature shall be corrected by addition if the ambient temperature is lo
30、wer than 25C (77F) or subtraction (if the ambient temperature is higher than 25C) of the difference between 25C and the ambient temperature. 8.4.3.7 If a corrected temperature exceeds the required value specifi ed in Table 8.4B, at the request of the manufacturer, the test may be repeated at an ambi
31、ent temperature closer to 25C (77F). Table 8.4A Dimensions of dummy fuses Rating in amperes Class of fuseShapeDimensions, mm (in) Outside diameter Wall thickness LengthThicknessWidth 30 H Tube14.27 (0.562)1.3 (0.051)50.8 (2.0) 60Tube20.62 (0.406)1.45 (0.057)76.2 (3.0) 100Blade149.23 (5.875)3.18 (0.1
32、25)19.05 (0.750) 200(250 volts)Blade180.98 (7.125)4.75 (0.187)28.58 (1.125) 400Blade219.08 (8.625)6.35 (0.250)41.28 (1.625) 600Blade263.53 (10.375) 6.35 (0.250)50.8 (2.0) 30 H Tube20.62 (0.812)1.45 (0.057)127 (5.0) 60Tube26.97 (1.062)1.63 (0.064)139.7 (5.5) 100Blade200.02 (7.875)3.18 (0.125)19.05 (0
33、.750) MAY 26, 2006SUBJECT 248T-5- Table 8.4A Continued on Next Page Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130 Not for Resale, 08/29/2006 21:53:19 MDTNo reproduction or networking permitted without license from IHS -,-,- F
34、OR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION Table 8.4A Continued Rating in amperes Class of fuseShapeDimensions, mm (in) Outside diameter Wall thickness LengthThicknessWidth 200(600 volts)Blade244.48 (9.312)4.75 (0.187)28.58 (1.125) 400Blade295.28 (11.625) 6.35 (0.250)41.28 (1.625)
35、600Blade339.72 (13.375) 6.35 (0.250)50.8 (2.0) 8.4.4 Acceptability of test results 8.4.4.1 The temperature limits shown in Table 8.4B shall not be exceeded. Table 8.4B Maximum temperature Materials and componentsDegrees CF A.COMPONENTS 1.Any bus, strap, or fuse clip fuseholders rated 100 amperes4095
36、 2.Any bus, strap, or fuse clip fuseholders rated 100 amperes60140 3. Pressure terminal connectors for fi eld installed conductors except as noted in item 4 55a131a 4.Pressure terminal connectors used on fuseholders rated 100 amperes or less and marked for use with 75C wire 70a158a B.ELECTRICAL INSU
37、LATION GENERAL 1.Wire insulation or insulating tubing40b104b 2.Electrical tape60b140b 3.Varnished cloth insulation65b149b 4.Fiber employed as electrical insulation70b158b 5.Sealing compound55b131b 6.Polymeric materials employed as electrical insulation or as a part the deterioration of which would r
38、esult in a risk of fi re, electric shock, or injury to persons RTI-20cRTI-68c a. Applicable to a connector for copper wire; also applicable to a connector for aluminum wire or an aluminum-bodied connector if the connector has a temperature rating of 90C (194F). b. This limitation for an insulated co
39、nductor or other material that has been investigated and found acceptable at a higher temperature shall be that higher temperature less 20 degrees Celsius (to represent the additional heating effect contributed by the use of actual fuses). c. RTI is the higher of the mechanical and electrical relati
40、ve thermal indices for the polymeric material 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. Copyright 2006 Underwriters Laboratories Inc. MAY 26, 2006SUBJECT 248T-6- Copyright Underwrit
41、ers Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130 Not for Resale, 08/29/2006 21:53:19 MDTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION Subject 248T (4248-6, 512)
42、 May 23, 2006 SUMMARY OF TOPICS The UL 4248-6 standard is Part 6 for a harmonized trinational set of standards developed to complement the harmonized trinational UL 248 series of standards in that it consists of a Part 1 containing General Requirements applicable to all fuseholders and 8 subsequent
43、Parts specifi c to a corresponding single Class of fuseholder. This bulletin supersedes the bulletin dated May 19, 2006. STP BALLOTS DUE: July 18, 2006 COMMENTS DUE: July 18, 2006 1. The UL 4248 series of standards is a harmonized trinational set of standards developed to complement the harmonized t
44、rinational UL 248 series of standards in that it consists of a Part 1 containing General Requirements applicable to all fuseholders and 8 subsequent Parts specifi c to a corresponding single Class of fuseholder. This bulletin supersedes the bulletin dated May 19, 2006. BACKGROUND The UL 4248 family
45、of Standards has been developed primarily to provide a tri-nationally harmonized (United States, Canada and Mexico) set of requirements for fuseholders. The UL 4248 series of Standards has been designed to complement the UL 248 family of Standards in that it consists of a Part 1 containing General R
46、equirements applicable to all fuseholders and 8 subsequent Parts specifi c to a corresponding single Class of fuseholder. RATIONALE The actual technical requirements; Construction, Performance and Marking remain fundamentally the same as those contained in UL 512, upon which the UL 4248 family is ba
47、sed. There are, however, some technical differences that have been incorporated into these Standards. These include: The exclusive use of dummy fuses, in lieu of actual fuses, in the performance testing of fuseholders. The use of dummy fuses will increase the consistency of test results by removing
48、the effects of fuse-to-fuse performance variations. The provision of requirements for the use of polymeric materials in the construction of fuseholders. The requirement of a 5 ma. limit for leakage current through an open fuse indicator or indicating circuit. Provision of a mechanism for the evaluation of the degree of electric shock protection provided by fuseholders marked with IP codes. Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130 Not for Resal