(this is obsolete)

EUROPEAN STANDARD

EN 60950/A2

August 1993

Amendment A2 to the English version of EN 60950

Safety of information technology equipment, including electrical business equipment (IEC 950:1991/A2:1993, modified)

This amendment A2 modifies the European Standard EN 60950:1992. It was approved by CENELEC on 6 July 1993. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this amendment the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member.

This amendment exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.

CENELEC European Committee for Electrotechnical Standardization Central Secretariat: rue de Stassart 35, B-1050 Brussels

. FOREWORD

At the request of the 71st Technical Board of CENELEC, the manuscript of amendment 2 to the international Standard IEC 950:1991 was submitted to the CENELEC Unique Acceptance Procedure (UAP) in November 1992 for acceptance as a European Standard.

The reference document, with common modifications as prepared by Reporting Secretariat SR 74 vas approved by CENELEC as amendment A2 to EN 60950 on 6 July 1993.

The following dates were fixed: - latest date of publication of an identical national standard (dop) 1994-03-01 - latest date of withdrawal of conflicting national standards (dow) 1995-03-01

For products which have complied with EN 60950:1992 and its amendment Al:1993 before 1995-03-01, as shown by the manufacturer or by a certification body, this previous standard may continue to apply for production until 2000-03-01.

NOTE: The following amendments have been made to annexes ZB and ZC: Annex ZB - Special national conditions: A new special national condition for Norway has been allowed for subclauses 2.3.9, 2/9/1 and 5.4.9. The special national condition for Denmark for subclause 5.4.1 has been deleted. Annex ZC - A-deviations: The UK deviation for subclauses 2.8.4 and 2.8.5 has been deleted. The Norwegian deviation for subclause 5.4.9 has been transferred to annex ZB (Special national conditions) and the one for subclause 6.3 has been deleted.

ENDORSEMENT NOTICE

The text of amendment 2:1993 to the International Standard IEC 950:1991 was approved by CENELEC as an amendment to the European Standard with agreed common modifications as given below.

COMMON MODIFICATIONS

2 Fundamental design requirements 2.9.1 Delete note 3.

4 Physical requirements 4.4.4 Delete note 3.

Annex D Measuring instrument for earth leakage current tests Add the following:

Until annex D of amendment 1:1992 to IEC 950:1991 has been amended by IEC/TC 74 in accordance with the decision taken at Us meeting in May 1993, the measuring instrument for earth leakage current testing as given in annex D of EN 60950:1992 (unamended) may be used instead of that in annex D of EN 60950:1992/A1:1993.

Annexes ZA, ZB and ZC Replace by the following new annexes:

. Annex ZA (normative)

Normative references to international publications with their relevant European publications

This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies.

NOTE. When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.

IEC # Date Title EN/HD Date

65(mod) 1985 Safety requirements for mains operated HD 195 S6 1989 electronic and related apparatus for household and similar general use 73 1984 Colours of indicator lights and push-buttons 1)HD 354 S2 1987 83 1975 Plugs and socket-outlets for domestic and similar general use 1984 Thermal evaluation and classification of HD 566 Sl 1990 electrical insulation 112 1979 Method for determining the comparative HD 214 S2 1980 and the proof tracking indices of solid insulating materials under moist conditions 277(mod) series Polyvinyl chloride insulated cables of rated HD 21 series voltages up to and including 450/750 V 245(mod) series Rubber insulated cables of rated voltages HD 22 series up to and including 450/750 V 309(mod) 1988 Plugs, socket-outlets and couplers for EN 60309 1992 industrial purposes 320(mod) 1981 Appliance couplers for household and similar 2)EN 60320-l 1987 general purpose 364 series Electrical installation of buildings HD 384 series 384-14 1981 Fixed capacitors for use in electronic - - equipment, Part 14: Sectional specification: Fixed capacitors for radio interference suppression - Selection of methods of test and general requirements 417 1973 Graphical symbols for use on equipment index, 3)HD 243 S10 1993 survey and compilation of the single sheets 664 1980 Insulation co-ordination within low-voltage systems including clearances and creepage distances for equipment 695-2-2 1980 Fire hazard testing - Part 2: Test methods HD 444.2.2 S1 Section 2: Needle-flame test 1983 825(mod)1984 Radiation safety of laser products, equipment 4)HD 482 S1 1988 classification, requirements and user's guide 885-l 1987 Electrical test methods for electric cables - - Part 1: Electrical tests for cables, cords and wires for voltages up to and including 450/750V 1032 1990 Test probes to verify protection by enclosures HD 601 S1 1991 .

1) HD 354 S2 is superseded by EN 60073:1993 which is based on IEC 73:1991- Coding of indicating devices and actuators by colours and supplementary means 2) EN 60320-1 includes Al:1984 + A2:1985 to IEC 320; A3:1987 was endorsed by EN 60320-1:1987/A3:1989 3) HD 243 S10 is based on IEC 417:1973 and its supplements A:1974 to K:1991 4) HO 482 Sl is superseded by EN 60825:1991 which includes A1:1990 to IEC 825

ISO # Date Title EN/HD Date

ISO 216 1975 Writing paper and certain classes of printed EN 20216 1990 matter- Trimmer sizes- A and B series ISO 261 1973 ISO General purpose metric screw threads - - General plan ISO 262 1973 ISO General purpose metric screw threads - - Selected sizes for screws, bolts and nuts ISO3864 1984 Safety colours and safety signs - - ISO4046 1978 Paper, board, pulp and related terms - - Vocabulary ISO7000 1984 Graphical symbols for use on equipment - - Index and synopsis

Other Publications

EN41003 1993 Particular electrical safety requirements for equipment to be connected to telecommunication networks CFR 47 Part 68 Code of Federal Regulations (USA) Part 68: Connection of terminal equipment to the telephone network (commonly referred to as "FCC Rules, part 68") 73/23/EEC Directive of 19 February 1973 on the harmonization of the laws of the Member States relating to electrical equipment designed for use within certain voltage limits (Low Voltage Directive)

. Annex ZB (normative)

Special national conditions

Special national condition: National characteristic or practice that cannot be changed even over a long period, e.g. climatic conditions, electrical earthing conditions. If it affects harmonization, it forms part of the European Standard.

For the countries in which the relevant special national conditions apply these provisions are normative, for other countries they are informative.

Clause Special national condition

1.2.4.1 In Denmark, certain types of Class I appliances (see subclause 3.2.1) may be provided with a plug not establishing earthing continuity when inserted into Danish socket-outlets.

1.7.1 In the United Kingdom, marking shall refer to 240V or 415V, these being the voltages of the public supply system.

1.7.2 In Norway, if separation between the mains and a communication system/network, other than public telecommunications networks, relies upon connection to safety earth, the equipment shall have a marking stating that it must be connected to an earthed mains socket-outlet. NOTE: For requirements for equipment to be connected to a public telecommunication network see 6.2.1.4.

In Sweden, if the separation between the mains and a SELV terminal relies upon connection to the safety earth, the apparatus shall have a marking stating that it must be connected to an earthed mains socket-outlet when a SELV-circuit is connected to a network passing both unearthed and earthed electrical environment.

The marking text shall be in Swedish and as follows: "Apparaten skall anslutas till jordat uttag när den ansluts till ett nätverk."

1.7.5 In Denmark, socket-outlets for providing power to other appliances shall be in accordance with the Heavy Current Regulations, Section 107-2-D1, Standard Sheet DK 1-3a, DK 1-5a or DK 1-7a, when used on appliances of Class I.

2.3.6 In Denmark, Finland and France, Method 3 is not acceptable.

2.3.9 In Norway, marking and insulation requirements according to this annex, subclauses 1.7.2 and 6.2.1.4.b) apply.

2.5.2 In Denmark, the first sentence is replaced by the following: Class II equipment shall have no provision for protective earthing, except that permanently connected equipment may be provided with a means for maintaining the continuity of protective earthing circuits to other equipment in a system, if the earth connection is separated from parts at hazardous voltages by double or reinforced insulation.

2.9.1 In Norway, due to the IT power systems used, the mains supply voltage is considered to be equal to the phase-to-phase voltage.

3.2.1 In Denmark, supply cords of single-phase appliances having a rated current not exceeding 10A shall be provided with a plug according to the following table:

Class of Plug Equipment Section 107-2-D1 Standard sheet

Class 1; Protection against DK 2-1a or DK 2-5a indirect contact required *)

Class 1; Earthing connection DK2-1a, DK2-5a, DKA 2-1a, not required DKA 2-1b, C 1b, C 2b, C 3b, C4

Class II DK 2-5a**), DKA 2-1a, DKA 2-1b, C 1b, C5, C6

*) - Appliances fitted with a socket-outlet for providing power to other appliances.

- Appliances covered by the general requirement for protection against indirect contact in Section 10, clause 18.1.

- Appliances which are mainly used in locations where protection against indirect contact is required, cf. Section 10, clause 17.

**)- The earthing contact not connected.

If poly-phase appliances and single-phase appliances having a rated current exceeding 10A are provided with a supply cord with a plug, this plug shall be in accordance with the following table:

Class Plug of The heavy Current Regulations standard sheet equipment Section 107-1-D1 Section 117

Class I DK 6-1a II Class II DK 6-1a *) II *) Class III - IX

*) - The earthing contact not connected.

3.2.1 In Switzerland, plugs for connection of the power supply cord to primary power have to comply with SEV/ASE 1011.

3.2.4 In the United Kingdom, a power supply cord with conductor of 1.25mm² is allowed for equipment with a rated current over 10A and up to and including 13A.

3.3.5 In the United Kingdom, the range of conductor sizes of flexible cords to be accepted by terminals for equipment with a rated current of over 10A up to and including 13A is: - 1.24mm² to 1.5mm² nominal cross-sectional area.

5.1 In Norway, to prevent fire risk, temperature rise limits for wooden supports shall be taken into account. The temperature rise limit is 65K in general and 60K for equipment for continuous operation.

5.4.9 In Norway, the electric strength test after the tests of 5.4.4, 5.4.5, 5.4.6, 5.4.7 and 5.4.8 includes testing of basic insulation in Class I equipment.

6.1 In Switzerland, protective means in the equipment shall not prevent transient surge protection in the telecommunication network from operating properly (d.c. spark-over voltage of the surge suppressor installed in the telecommunication network: approx. 245V).

6.2.1.4b) In Finland, this method is only permitted for permanently connected equipment or for pluggable equipment type B.

In Norway, insulation between parts conductively connected to the supply mains and parts connected to a public telecommunication network shall comply with the requirements for double or reinforced insulation.

6.4.1 In Finland, for pluggable equipment it is forbidden to use surge suppressors between the telecommunication network and conductive metallic parts which are permitted to be accessible.

. Annex ZC (Informative)

A-Deviations

A-deviation: National deviation due to regulations, the alteration of which is for the time being outside the competence of the CENELEC member.

This European Standard falls under Directive 73/23/EEC.

NOTE (from CEN/CENELEC IR Part 2, 3.1.9): Where standards fall under EC Directives, it is the view of the Commission of the European Communities (OJ No C59, 9.3.1982) that the effect of the decision of the Court of Justice in case 815/79 Cremonini/Vrankovich (European Court Reports 1980, p. 3583) is that compliance with A-deviations is no longer mandatory and that the free movement of products complying with such a standard should not be restricted except under the safeguard procedure provided for in the relevant Directive.

A-deviations in an EFTA-country are valid instead of the relevant provisions of the European Standard in that country until they have been removed.

Clause Deviation

1.1.3 Switzerland (Swiss Telecommunications law SR 784.10) This standard applies also to all equipment designed and intended to be connected to a telecommunication network terminal.

1.5.1 Sweden (Ordinance SFS 1991:1290) Add the following: NOTE: Switches containing mercury such as thermostats, relays and level controllers are not allowed.

1.7.2 Denmark (Heavy Current Regulations) Supply cords of Class I appliances, which are delivered without a plug, must be provided with a visible tag with the following text: "Vigtigt! Lederen med grøn/gul isolation må kun tilsluttes en klemme mærket (insert IEC 417 ) eller (insert IEC 417 ) (symbol No. 5017) (symbol No. 5019)"

If essential for the safety of the appliance, the tag must in addition be provided with a diagram, which shows the connection of the other conductors, or be provided with the following text: "For tilstutning af de øvrige ledere, se medfølgende installationsvejledning"

United Kingdom (Statutory Instrument 931:1977) Power supply cords of Class I equipment must be provided with a label with the following text in legible characters: IMPORTANT The cores in this mains lead are coloured in accordance with the following code: - green and yellow: earth - blue: neutral - brown: live

1.7.5 Denmark (Heavy Current Regulations) Class II appliances shall not be fitted with socket-outlets for providing power to other appliances.

1.7.14 Germany (Gesetz über technische Arbeitsmittel (Gerätesicherheitsgesetz) [Law on technical labour equipment (Equipment safety law)], of 24th June 1968 in the version of 18 February 1986, Article 3, 3rd paragraph, 2nd sentence, together with the "Allgemeine Verwaltungsvorschrift zum Gesetz über technische Arbeitsmittel" [General administrative regulation on the law on technical labour equipment)], Article 2, 2nd paragraph, item 2.) Directions for use with rules to prevent certain hazards for (among others) maintenance of the technical labour equipment, also for imported technical labour equipment shall be written in the German language. NOTE: Of this requirement, rules for use even only by service personnel are not exempted.

1.7.17 Switzerland (Ordinance on environmentally hazardous substances SR 814.013) Annex 4.10 of SR 814.013 applies for batteries.

1.7.18 Sweden (Ordinance SFS 1989:974) Equipment provided with built-in batteries, not replaceable by the user, shall be marked with the following symbol if the batteries have a content of mercury or cadmium exceeding 0.025 % by weight. (not shown here - a triangle of three) (circling arrows enclosed in a box. )

2.11 Denmark (Heavy Current Regulations) Finland (Decree N° 205/74) A limited power source shall incorporate an isolating transformer and shall comply with the following: - the open-circuit voltage shall not exceed 42.4V peak d.c. and shall not generate voltages above that value; - the current which may be drawn for more than two minutes at any load, including short circuits, shall not exceed 0.2A.

Norway (National Building Installation Specification-Feb. 1991)

Table 8-Limits for inherently limited power sources In Norway, the maximum value of VA for values of Uoc exceeding 10V is 50. Table 9-Limits for power sources not inherently limited (overcurrent protective device required) In Norway, the maximum value of VA is 50.

6.4.2.1 Austria (Fernmeldebauvorschrift Teil 11) Equipment shall comply with Uoc = 2,0 kV in cases b) and c).

Annex H Germany (Regulation on protection against hazards by X-ray, of 8th January 1987, Article 5 (Operation of X-ray emission source), Clauses 1 to 4) a) A license is required by those who operate an X-ray emission source. b) A license in accordance with clause 1 is not required by those who operate an X-ray emission source on which the electron acceleration voltage does not exceed 20 kV if 1) The local dose rate at a distance of 0.1 m from the surface does not exceed 1 µSv/h and 2) it is adequately indicated on the X-ray emission source that i) X-rays are generated and ii) the electron acceleration voltage must not exceed the maximum value stipulated by the manufacturer or importer. c) A license in accordance with clause 1 is also not required by persons who operate an X-ray emission source on which the electron acceleration voltage exceeds 20 kV if 1) the X-ray emission source has been granted a type approval and 2) it is adequately indicated on the X-ray emission source that i) X-rays are generated, ii) the device stipulated by the manufacturer or importer guarantees that the maximum permissible local dose rate in accordance with the type approval is not exceeded and iii) the electron acceleration voltage must not exceed the maximum value stipulated by the manufacturer or importer. d) Furthermore, a license in accordance with clause 1 is also not required by persons who operate X-ray emission sources on which the electron acceleration voltage does not exceed 30 kV if 1) the X-rays are generated only by intrinsically safe CRTs complying with Enclosure III, no. 6. 2) the values stipulated in accordance with Enclosure III, No. 6.2 are limited by technical measures and specified in the device and 3) it is adequately indicated on the X-ray emission source that the X-rays generated are adequately screened by the intrinsically safe CRT.