ANSI UL 4248-11-2007 UL Standard for Safety Fuseholders - Part 11 Type C (Edison Base) and Type S Plug Fuse (First Edition Reprint with Revisions Through and Including April 4 2018.pdf

1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 4248-11 Fuseholders Part 11: Type C (Edison Base) and Type S Plug Fuse STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION F

2、ROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Fuseholders Part 11: Type C (Edison Base) and Type S Plug Fuse, UL 4248-11 First Edition, Dated February 28, 2007 Summary of Topics This revision to ANSI/UL 424

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9、ation and Certication NMX-J-009/4248/11-ANCE First Edition CSA Group CAN/CSA-C22.2 No. 4248.11-07 First Edition Underwriters Laboratories Inc. UL 4248-11 First Edition Fuseholders Part 11: Type C (Edison Base) and Type S Plug Fuse February 28, 2007 (Title Page Reprinted: January 13, 2017) ANSI/UL 42

10、48-11-2007 (R2012) Approved byUL 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 (operati

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19、D MATERIAL 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 .7 6.1 Marking of fuseholder 7 7 Construction .7 7.4 Current-carrying parts .7

20、 7.6 Contacts of a cartridge fuseholder 8 7.7 Creepage and clearance 9 7.8A Type S plug fuseholders and adapters 10 8 Tests .18 8.1 General .18 8.4 Verication of temperature rise 18 8.6A Verication of contactrejection member effectiveness 21 8.7A Verication of screw shell secureness .21 FEBRUARY 28,

21、 2007 NMX-J-009/4248/11-ANCE CSA C22.2 NO. 4248.11-07 UL 4248-11 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Preface This is the common ANCE, CSA Group, and UL standard for Fuseholders Part 11: Type C (Edison Base) and Type S Plug Fuse.

22、 It is the rst edition of NMX-J-009/4248/11-ANCE, the rst edition of CSA C22.2 No. 4248-11, and the rst edition of UL 4248-11. This common standard was prepared by the Association of Standardization and Certication (ANCE), CSA Group, and Underwriters Laboratories Inc. (UL). The efforts and support o

23、f 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 voltage fuses, under the jurisdictio

24、n 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 Canada for approval as a National Standar

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30、t. JANUARY 13, 2017 NMX-J-009/4248/11-ANCE CSA C22.2 NO. 4248.11-07 UL 4248-11 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JANUARY 13, 2017 NMX-J-009/4248/11-ANCE CSA C22.2 NO. 4248.11-07 UL 4248-11 5 No Text on This PageUL COPYRIGHTED

31、MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Fuseholders Part 11: Type C (Edison Base) and Type S Plug Fuse 1 General This Part is intended to be read together with the Standard for Fuseholders Part 1: General Requirements hereafter referred to as Part

32、1. The numbering of the Clauses in this Part corresponds to like 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-

33、1. 1.1 Scope 1.1.2 These requirements cover: a) fuseholders intended for use with Type C (Edison-base) and Type S Plug Fuses as described in NMX-J-009/248/11-2000-ANCE, CSA C22.2 No. 248.11, UL 248-11, Low-Voltage Fuses Part 11: Plug Fuses; b) devices intended to be added to Edison-base fuseholders

34、to reject fuses with larger ampere ratings; and c) devices intended to adapt Type S plug fuses for use in Edison-base fuseholders. 4 Classication 4.1 Plug fuse fuseholders have a short-circuit withstand rating of 10,000 A. Plug fuse fuseholders are rated 250 V or less, and may be of Edison-base or T

35、ype S base design. 5 Characteristics 5.1 Summary of characteristics 5.1.3 Voltage and current rating 5.1.3.1 Plug fuse fuseholders shall be rated 125, 127, or 250 V. 5.1.3.2 Plug fuse fuseholders shall be rated 15, 20, or 30 A. JANUARY 13, 2017 NMX-J-009/4248/11-ANCE CSA C22.2 NO. 4248.11-07 UL 4248

36、-11 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.1.4 Withstand rating 5.1.4.1 Plug fuse fuseholders shall have a short-circuit withstand rating of a 10,000 A. 6 Marking 6.1 Marking of fuseholder 6.1.1.1 In addition to the requirements

37、of Part 1, Clauses 6.1.1.2 and 6.1.1.3 shall apply. 6.1.1.2 The marked current rating of a Type S fuseholder shall be located so that it will be plainly visible after installation. 6.1.1.3 A Type S adapter need not be marked with a withstand rating if the smallest unit package is marked Withstand Ra

38、ting 10,000 rms amperes when installed in an Edison-base fuseholder marked 10,000 rms amperes. 7 Construction 7.4 Current-carrying parts 7.4.1 Except for plated No. 10 and larger wire-binding screws and nuts and stud terminals, iron or steel, plain or plated, shall not be used for parts that are dep

39、ended upon to carry current. A plated iron or steel washer may be used under the center contact of an Edison-base plug fuseholder. 7.4.2 In a plug-fuseholder assembly intended for the connection of 15 A branch circuits, the ampacity of bus bars shall be as specied in Table 7.4A. Table 7.4A Minimum a

40、mpacity of bus bars Total number of fuses per ungrounded bus bar a Minimum ampacity 2-wire mains 125 250 V, 3-wire mains 3-phase, 4-wire mains 23 03 03 0 33 53 33 1 44 84 24 0 56 65 0 66 66 0 7o r8 8 4 9o r1 0 1 0 0 11 or 12 120 a For an assembly that has an unequal number of fuses per ungrounded bu

41、s bar, calculations shall be based on the larger number of fuses per ungrounded bus bar. FEBRUARY 28, 2007 NMX-J-009/4248/11-ANCE CSA C22.2 NO. 4248.11-07 UL 4248-11 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 7.6 Contacts of a cartridg

42、e fuseholder This section of Part 1 is not applicable to plug fuse fuseholders. The following requirements replace this section of Part 1. 7.6.1 Screw shells of Edison-base plug fuseholders 7.6.1.1 The thickness of the screw shell of a plug fuseholder, measured on the at surface of the bottom of the

43、 shell, shall not be less than 0.30 mm (0.012 in). 7.6.1.2 The screw shell of a plug fuseholder shall be made of copper or copper alloy. Aluminum or an aluminum alloy shall not be used. 7.6.1.3 A screw shell shall be of the medium-base size and shall, when tested with gauges made in conformity with

44、the American National Standard Dimensions for Rolled Threads for Screw Shells of Electric Lampholders and for Screw Shells of Unassembled Lamp Bases, ANSI C81.1, go and not go as applicable. 7.6.1.4 The distance between the center contact and the plane of the edge of the insulation material surround

45、ing the screw shell of a plug fuseholder, dimension K in Figure 7.6A, shall not be less than 19.1 mm (0.750 in) nor more than 20.6 mm (0.812 in). The distance between the center contact and the plane of the outer edge of the screw shell, dimension L, shall not be less than 14.3 mm (0.562 in) nor mor

46、e than 17.5 mm (0.687 in). In a fuseholder with a spring-type center contact, the dimensions K and L shall be measured with the contact fully depressed. There shall not be fewer than two full threads in the metal screw shell beginning at the plane of the outer edge 7.6.1.5 A fuseholder may employ a

47、female member of special design not necessarily of the screw shell type if it complies with the requirements in Clauses 7.6.1.3 and 8.7A, and if it has been found to be acceptable for the purpose by other appropriate tests, which may include temperature and short-circuit tests. This is generated tex

48、t for gtxt. FEBRUARY 28, 2007 NMX-J-009/4248/11-ANCE CSA C22.2 NO. 4248.11-07 UL 4248-11 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 7.7 Creepage and clearance 7.7.1 Creepage and clearance spacings of a plug fuseholder shall be as speci

49、ed in Table 7.7A, except spacings: a) between adjacent screw shells of Edison-base plug fuseholders that are protected by surrounding walls of insulating material; b) between parts of the upper-contactor rings of adjacent Type S plug fuseholders; and c) between such screw shells or upper-contact-ring parts and a metal cover plate shall not be less than 6.4 mm (0.250 in) if the depth of the rece