1、 National Differences For UL 60950-23 Information Technology Equipment - Safety - Part 23: Large Data Storage Equipment 2 NATIONAL DIFFERENCES FOR UL 60950-23 APRIL 23, 2007 _ Underwriters Laboratories Inc. National Differences For UL 60950-23 Information Technology Equipment - Safety - Part 23: Lar
2、ge Data Storage Equipment Edition: 1 Edition Date: April 23, 2007 This is the publication of the first edition of UL 60950-23 which includes the adoption of the UL national differences to IEC 60950-23. This document provides a single listing of the National Differences included in the UL adoption of
3、 the corresponding IEC standard. Editorial differences appearing in the UL standard are not included in this technical compilation. The complete listing of National Differences is available in the UL standard. The master for this standards document at ULs Northbrook Office is the official standards
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17、R UL 60950-23 APRIL 23, 2007 _ Underwriters Laboratories Inc. Preface This document provides a single listing of the technical National Differences included in the UL adoption of the corresponding IEC standard. Editorial National Differences (those marked DE) are not included in this technical compi
18、lation. In its IEC-based standards, UL uses the notations indicated below to identify national difference type, and these types are additionally noted in this document. The standard may not use all types of these deviations. DR - These are differences based on the National Electrical Code (NEC) and
19、other U.S. Regulatory Requirements. D1 - These are differences which are based on basic safety principles and requirements, elimination of which would compromise safety for U.S. consumers and users of products. Requirements related to these National Differences are based on North American regulatory
20、 requirements and are specified in Annex NAE. D2 - These are differences based on safety practices. These are differences for IEC requirements that may be acceptable, but adopting the IEC requirements would require considerable retesting or redesign on the manufacturers part. Some of these National
21、Differences are Markings and Instructions Requirements and are specified in Annex NAA. D3 These are national differences based on bi-national requirements which result in less stringent requirements than in IEC 60950-1. DC - These are differences based on the component standards and will not be dele
22、ted until a particular component standard is harmonized with the IEC component standard. Component requirements for these deviations are specified in Annexes P.1 and P.2. DE These are differences based on editorial comments or corrections. 5 NATIONAL DIFFERENCES FOR UL 60950-23 APRIL 23, 2007 _ Unde
23、rwriters Laboratories Inc. National Differences 2 D2 Modified by addition of the following: All references to IEC 60950-1 in this standard are replaced by the equivalent UL and CSA 60950-1 binational Standards as listed below. (Either the first or second editions of CSA/UL 60950-1 may be used.) All
24、relevant Standards referenced in the Part 1 Standard (Annex P, including P.1 and P.2) also apply to this Part 23 Standard and are not listed below. All references to clauses and subclauses in IEC 60950-1 are to the second edition. If the relevant clause or subclause has been renumbered in IEC 60950-
25、1, second edition, the first edition reference is identified in parentheses directly after the second edition reference. CAN/CSA-C22.2 No. 60950-1-03 or CAN/CSA-C22.2 No. 60950-1-07, Information Technology Equipment - Safety - Part 1: General Requirements UL 60950-1, Information Technology Equipment
26、 - Safety - Part 1: General Requirements 2 D2 Modified by deletion of reference to IEC 60950-1:2005. 6 DC Modified by adding “, or” to the end of the second dash and the following third dash: - DC a switch complying with either UL 508, UL 1054, UL 61058-1, CAN/CSA C22.2 No. 61058-1 or CSA C22.2 No.
27、14 and provided with a latching type mechanism meeting the requirements of IEC 60947-5-5. 6 NATIONAL DIFFERENCES FOR UL 60950-23 APRIL 23, 2007 _ Underwriters Laboratories Inc. New Annex D1 Annex NAE (informative) U.S. and Canadian regulatory requirements This annex provides examples of and referenc
28、es for regulatory requirements that might apply to some equipment. Applicability of these requirements is dependent on the construction of the equipment and its intended installation and use. This annex is not intended to provide a complete list of all of the applicable requirements, only to serve a
29、s a reference for requirements that most commonly apply to this type of equipment. For complete requirements, the National Electrical Code, ANSI/NFPA 70, the Canadian Electrical Code, Part I, or other referenced document must be consulted. Any undated reference to a code or standard appearing in the
30、 requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. NOTE 1 Underlining to indicate text added to IEC 60950-23 is not used in this annex. NOTE 2 The complete text of Annex NAE is a D1 national difference. D1 Annex NAE Clause No. Topic/summa
31、ry NEC CEC 1 Automated information storage equipment For ITE (computer) room applications, automated information storage equipment, which is enclosed storage and retrieval equipment that moves recorded media between storage and electronic computer equipment, that is intended to contain more than 0,76 m3of combustible media shall have provision for either automatic sprinklers or a gaseous agent extinguishing system with an extended discharge. NFPA 75 Sections 3.3.2, 6.2.1.2, 8.1.4 and A.8.1.4
