UL 248-9:2015 pdf download – Low-Voltage Fuses – Part 9: Class KFuses.
This is the common UI. CSA. and ANCE Standard for Low-Voltage Fuses — Pail 9: Class K Fuses. This is the second edition of CANJCSA-C22.2 No. 248.9-00 (superseding the first edition, published in 1996), the second edition of UL 248-9, and the first edition of NMX-J-00924&9-2000-ANCE.
This Standard was prepared by a Technical Harmonization Committee comprised of members from
Underwriters Laboratories, CSA International. the National Association of Standardization and
Certification of the Electrical Sector, the end product manufacturers, and material suppliers. The efforts
and support of the members of the Technical Harmonization Committee are gratefully acknowledged.
The present Mexican Standard was developed by the TC 32 Fuses from the Comite de Nornializacion de Ia Asociacion de Normalizacon y Certiticacion. A.C., CONANCE. with the collaboration of the fuse manufacturers and users.
This Standard was reviewed by the CSA Subcommittee on Fuses and approved by the Technical
Committee on Industrial Products under the jurisdiction of the CSA Strategic Steering Committee on the
Requirements for Electrical Safety.
This Standard has been approved by the American National Standards Institute (ANSI) as an Amencan National Standard.
This ANSIJUL Standard for Safety consists of the Second Edition including revisions through March 24, 2015. The most recent designation of ANSI/UL 248-9 as a Reaffirmed American National Standard (ANS) occurred on March 24. 2015. ANSI approval for a standard does not include the Cover Page. Transmittal Pages. Title Page (front and back), or the Preface.
Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time.
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Level of Harmonization
This trinational standard is published as an Identical Standard. An identical standard is a standard that is the same in technical content except for conflicts in Codes and Governmental Regulations. Presontatiori is word for word except for editorial changes.
Interpretations
The interpretation by the SDO (Standards Development Organization) of an identical standard shall be based on the literal text to determine compliance with the standard in accordance with the procedural rules of the SDO. If more than one interpretation of the literal text has been identified, a revision shall be proposed as soon as possible to each of the SDOs to more accurately reflect the intent.
8.4 Verification of operation at rated voltageFor AC – Part 1，Table 5
Test 1 – 50,000,100,000,or 200,000 A in accordance with the interrupting rating of the fuseTest 2 – Maximum energy
Test 4a – 100,000 A if less than the interrupting rating of the fuseTest 4b – 50,000 A if less than the interrupting rating of the fuseTest 5b – 2ln
Peak let-through current and clearing lPt recorded during Test 1.For Dc – Part 1,Table 6
Test 1 – Interrupting ratingTest 2 – Maximum energy
Test 5a-9 l, for time-delay fuses onlyTest 5c – 2 ln
8.5 Verification of peak let-through current and clearing l2t characteristics8.5.3 Acceptability of test results
Peak let-through current and clearing lPt values recorded shall not exceed the limits specified in Table A.9 Special Tests
9.1 General
9.1.1 Types of tests
For fuses with a low melting point “P”(“D”: for time delay) characteristic, one fuse of each body size shallbe tested.