1、 National Differences For UL 60950-1 Information Technology Equipment - Safety - Part 1: General Requirements 2 NATIONAL DIFFERENCES FOR UL 60950-1 MARCH 27, 2007 _ Underwriters Laboratories Inc. National Differences For UL 60950-1 Information Technology Equipment - Safety - Part 1: General Requirem
2、ents Edition: 2 Edition Date: March 27, 2007 This is the second edition of the bi-national Standard and is based on IEC 60950-1, second edition. This document provides a single listing of the National Differences included in the UL adoption of the corresponding IEC standard. Editorial differences ap
3、pearing 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 document insofar as it relates to a UL service and the co
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17、c. 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 compilation. In its IEC-based standards, UL uses the notations i
18、ndicated 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 other U.S. Regulatory Requirements. D1 - These are differen
19、ces 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 requirements and are specified in Annex NAE. D2 - These ar
20、e 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 Differences are Markings and Instructions Requirements and
21、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 deleted until a particular component standard is harmonized wit
22、h 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 60950-1 MARCH 27, 2007 _ Underwriters Laboratories Inc. National Differences 1.1.1, Equip
23、ment covered by this standard. Modified by the following: Addition D1 . . . RATED VOLTAGE not exceeding 600 volts and designed to be installed in accordance with the Canadian Electrical Code, Part I; General Requirements - Canadian Electrical Code, Part II, CSA C22.2 No. 0-M91; the National Electric
24、al Code, NFPA 70-2005; and the National Electrical Safety Code, IEEE C2-2002. D1 The standard is also applicable to equipment, unless otherwise identified by a marking or instructions, designed to be installed in accordance with Article 645 of the National Electrical Code, NFPA 70, and the Standard
25、for the Protection of Information Technology Equipment, NFPA 75-2003. D1 This standard also specifies requirements intended to reduce risks from acoustic outputs at communication receivers and similar devices used for voice telecommunication, regardless of transmission medium (e.g., TELECOMMUNICATIO
26、N NETWORK, CABLE DISTRIBUTION NETWORK, wireless network). See Annex NAD. 1.2.8.2 Modified by the following: Addition D2 NOTE 2 See 1.6.1.2 1.4.4, Operating parameters for tests. Modified by the following: Addition D1 overcurrent protection devices provided as part of the building installation for pr
27、otection against overcurrents, short-circuits, and earth faults. (See 1.4.14.) 1.4.14, Simulated faults and abnormal operations. Modified by the following: Addition D1 When applying simulated faults or abnormal operating conditions, consideration should be given to the overcurrent protection devices
28、 provided as part of the building installation for protection against overcurrents, short-circuits, and earth faults. D1 For PLUGGABLE EQUIPMENT TYPE A, the protection in the installation shall be taken to be a fuse or circuit breaker rated 20 A. D1 For PLUGGABLE EQUIPMENT TYPE B, the protection in
29、the installation shall be equal to the rated current of the plug or as specified in the installation instructions. (See 2.7.1.) 6 NATIONAL DIFFERENCES FOR UL 60950-1 MARCH 27, 2007 _ Underwriters Laboratories Inc. 1.5.1, General. Modified by the following: Addition DC In this standard, certain IEC c
30、omponent standard requirements are replaced by the relevant requirements of component standards listed in Annex P.1. Addition DC In this standard, certain requirements (such as flammability tests) are alternatively satisfied by complying with relevant requirements of component standards listed in An
31、nex P.2. 1.5.5, Interconnecting cables. Modified by the following: Addition D1 INTERCONNECTING CABLES used for external interconnection between parts of equipment or systems shall be constructed of cable acceptable for external use and shall be rated for the application with respect to voltage, curr
32、ent, anticipated temperature, flammability, mechanical serviceability and the like. DC Cable assemblies with lengths external to the unit not exceeding 3,05 m, coiled or uncoiled, may be constructed of jacketed appliance wiring material, suitable for the maximum voltage, current and temperature, rat
33、ed VW-1 or FT-1 or better. DC Cable assemblies or wiring with lengths external to the unit not exceeding 3,05 m, coiled or uncoiled, and supplied by a limited power source or CEC/NEC Class 2 source of supply as defined in the Canadian Electrical Code, CSA C22.1 and National Electrical Code, ANSI/NFP
34、A 70, may be constructed of materials rated VW-1 or FT-1 or better with no additional requirements. D1 Compliance is checked by inspection. D2 1.6.1.2, DC Power Distributuion Systems. Addition of the following sub-clause: D2 A circuit for connection to the DC MAINS SUPPLY is classified as either a S
35、ELV CIRCUIT, TNV-2 CIRCUIT or HAZARDOUS VOLTAGE CIRCUIT depending on the maximum operating voltage of the supply. This maximum operating voltage shall include consideration of the battery charging “float voltage“ associated with the intended supply system, regardless of the marked power rating of th
36、e equipment. D2 NOTE Equipment marked -60 V d.c. and connected to a DC MAINS SUPPLY may have a maximum operating voltage of up to -75 V d.c. per IEC TR 62102. D2 For the purposes of applying insulation requirements only, circuits connected to a DC MAINS SUPPLY shall be treated as indicated below: D2
37、 Maximum Operating Voltage of DC MAINS SUPPLY Classification of Circuit Connected to DC MAINS SUPPLY D2 up to 60 V d.c. SELV D2 60 V up to and including 80 V TNV-2 D2 80 V HAZARDOUS VOLTAGE D2 These circuits are not current-limited to TNV CIRCUIT limits when providing power for equipment connected t
38、o a DC MAINS SUPPLY but shall be appropriately current-limited when connected to a TELECOMMUNICATION NETWORK. 7 NATIONAL DIFFERENCES FOR UL 60950-1 MARCH 27, 2007 _ Underwriters Laboratories Inc. D2 See 3.2.1.2 for additional connection requirements for equipment connected to a DC MAINS SUPPLY. 1.7,
39、 Markings and instructions. Modified by the following: Addition of item to list D2 Annex NAA 2.1.1.1, Access to energized parts. Modified by the following: Addition after “ bare parts of TNV CIRCUITS . . . . . “ D3 bare conductive parts in the interior of equipment that are normally protected agains
40、t contact by a cover intended for occasional removal by the OPERATOR, such as for the installation of accessories, provided that the installation instructions include directions for the disconnection of the TNV CIRCUIT connector before removing the cover; 2.3. 1 b) Limits. Modified by the following:
41、 Addition before “the voltages exceed . . . but do not exceed the following:” D2 Except as permitted in 1.6.1.2, Addition after “. . of either Clause M.2 or Clause M.3;” D2 when other telephone signals are present, voltages such that the signal complies with the criteria of Clause M.4; Addition afte
42、r the formula for voltage combination. D2 and for voltages exceeding 42,4 V peak or 60 V d.c., the current flowing through any resistance 2 000 ohms or greater connected across the voltage source with other loads disconnected does not exceed 7,1 mA peak or 30 mA d.c. Addition after “the voltage limi
43、ts of Figure 2F . . . within the equipment” D2 , except the limits after 200 ms specified in Figure 2F are replaced by the limits of M.3.1.4. 2.3.2.1, General requirements. Modified by the following: Deletion after “b) the voltages of . . . do not exceed the limits specified in ” D2 2.3.1 b) for TNV
44、-2 CIRCUITS and TNV-3 CIRCUITS under normal operating conditions 2.2.3. 8 NATIONAL DIFFERENCES FOR UL 60950-1 MARCH 27, 2007 _ Underwriters Laboratories Inc. 2.6.3.3 Table 2D. Modified by the following: Addition/Deletion D1 PROTECTIVE CURRENT RATING of the circuit under consideration Minimum conduct
45、or sizes Up to and including A Cross-sectional area mm2AWG or kcmil (cross-sectional area in mm2) 6 0.519 20 (0.519) 10 0.75 18 (0.8) 13 1.00 16 (1.316 1.25 Size not specified 16 (1.3) Size not specified 2.6.3.4, Resistance of earthing conductors and their terminations. Modified by the following: Ad
46、dition D1 PROTECTIVE BONDING CONDUCTORS and their terminals of non-standard constructions, such as printed wiring protective traces, shall also be evaluated in accordance with the Limited Short-Circuit Test in CSA C22.2 No. 0.4, Bonding of Electrical Equipment. PROTECTIVE BONDING CONDUCTORS that can be determined to meet the equivalent of the minimum conductor sizes in Table 2D and are provided with terminals not more than one size smaller than the sizes in Table 3E (see 3.3.5) shall be considered to comply without test. 3.1.1, Current rating and overcurrent protection. Modified by the fol
