(this is obsolete)

EN 60950/A1

January 1993

Descriptors: Information technology equipment, business equipment, personal computer, safety

Amendment A1 to the English version of EN 60950

Safety of information technology equipment, including electrical business equipment

(IEC 950: 1991/A1: 1992)

This amendment A1 modifies the European. Standard EN 60950:1992. It was approved by CENELEC on 1992-12-09 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 Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 36, B-1050 Brussels

1 .

Foreword

At the request of the 71st Technical Board of CENELEC, amendment 1: 1992 to the International Standard IEC 950: 1991 was submitted to the CENELEC Unique Acceptance Procedure (UAP) in May 1992 for acceptance as a European Standard.

The text of the International Standard was approved by CENELEC as amendment A1 to EN 60950 on 9 December 1992.

The following dates were fixed:

· latest date of publication of an identical national standard (dop) 1993-09-01

· latest date of withdrawal of conflicting national standards (dow) 1995-03-01

For products which have complied with EN 60960: 1992 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.

Endorsement notice

The text of amendment 1: 1992 to the International Standard IEC 960: 1991 was approved by CENELEC as an amendment to the European Standard without any modification.

National foreword

This British Standard has been prepared under the direction of the Electronic Equipment, Standards Policy Committee and is the English language version of EN 60950:1992 Safety of information technology equipment, including electrical business equipment , including Amendment A1, published by the European Committee for Electrotechnical Standardization (CENELEC). It, was derived by CENELEC from IEC Publication 950:1991 second edition, as amended by Amendment No. 1:1992, published by the International Electrotechnical Commission (IEC). It supersedes BS 7002:1989.

The foreword of the EN Amendment 1 makes reference to the 'date of withdrawal (dow) of conflicting national standards as '1995-03-01'. In this case the conflicting national standard is BS EN 60950:1992 but the 'dow' relates only to those parts of the British Standard subject to Amendment No. 1. Certificates and marks will not be awarded after this date with respect to the British Standard not incorporating Amendment No. 1. They will be awarded with respect only to the amended British Standard. However, such certificates and marks already awarded with respect to the British Standard not incorporating Amendment No. 1 may continue to apply

2 .

The foreword of EN 60950 makes reference to the 'date of withdrawal', dow, of the relevant national standard. In this case the relevant national standard is BS 7002: 1989, which will cease to be applicable to information technology equipment within the scope of EN 60950 on 1995-03-01. Certification and marks will not be awarded after this date with respect to BS 7002:1989. However such certification and marks, already awarded, may continue to apply to production until 2000-03-01.

The CENELEC common modifications have been implemented at the appropriate places in the text and are indicated by a side line in the margin. Parts of the original IEC text that have been modified by CENELEC have been quoted in national annex NA.

In this standard, the following print types are used:

· requirements proper: in roman type;

· test specifications: in italic type;

· notes and other informative matter: in smaller roman type;

· conditions applicable to tables: in smaller roman type;

· terms that are defined in 1.2: SMALL CAPITALS.

Compliance with a British Standard does not of itself confer immunity from legal obligations.

3 .

COMMON MODIFICATIONS

1.2.8.8Add: A TNV circuit is considered to be a secondary circuit in the meaning of 1.2.8.2 of this standard.

1.7.2 Delete note 4.

1.7.11 Replace "2.7.2" by "2.7". 2.3.3 Delete Method 4 and the line in note 1 relating to this

2.3.6 Delete the note. 2.3.7 Replace the text of this subclause by: Void

2.5.2 Delete the note. 2.7.1 Replace the text of this subclause by: 2.7.1 Basic requirements "To protect against excess current, short circuits and earth faults in primary circuits, protective devices shall be included either as integral parts of the equipment or as a part of the building installation, subject to (a), (b) and (c) below. (a) Except as detailed in (b), protective devices necessary to comply with the requirements of subclause 5.4 shall be included as integral parts of the equipment. (b) For components in series with the mains input to the equipment such as the supply cord, appliance coupler, RFI filter and switch, short circuit and earth fault protection may be provided with protective devices in the installation. (c) If reliance is based on protection in the building

2.7.2 Replace the text of this subclause by: Void 2.8.4 Delete the note.

2.11 Delete notes 1, 2 and 3. 3.2.2 Delete the note, and in table 10, delete the values in

3.2.4 Replace "245 IEC 53" by "H05RR-F", 227 IEC 52" by "H03VV-F or H03VVH2-F" and "227 IEC 53" by "H05VV-F or H05VVH2-F2". In Table 22, replace the first four lines by the following: up to and including 6 0.75 1) Over 6 up to and including 10 1.0 Over 10 up to and including 16 1.5 In the conditions applicable to table 11, delete the words "in some countries" in condition 1 and delete conditions 2 and 3.

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3.3.5 In Table 13, replace the fourth and the fifth lines by: Over 10 up to and including 16 1.5 to 2.5

6.2.1.1 Add at the end of the subclause: In the event of a single insulation fault or component failure, TNV circuits shall not exceed the limits of

6.2.1.2 Add at the end of the subclause: This subclause only applies to TNV circuits normally operating in excess of the limits of SELV circuits.

6.2.1.3 Add at the end of the subclause This subclause only applies to TNV circuits normally operating in excess of the limits of SELV circuits. 6.2.1.4 Delete the notes.

6.3.3 In the second paragraph, replace "for functional reasons" by "to enable the equipment to function".

6.4.1 Delete note 2. 6.4.2.1 Delete note 2.

Annex Normative references P Replace the text of this annex by: See annex ZA.

Annex Q Bibliography Add for IEC 529: NOTE: Endorsed by EN 60529:1991 (not modified) Add for IEC 707: NOTE: Endorsed by HD 441:1983 (not modified) Add for IEC 1058-1: NOTE: Endorsed by EN 61058-1:1992 (not modified)

5 .

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 1985 Safety requirements for mains HD 195 1989 (mod) operated electronic and related S6 apparatus for household and

73 1984 Colours of indicator lights and HD 354 1987

83 1975 Plugs and socket-outlets for - - domestic and similar general use 85 1984 Thermal evaluation and HD 566 1990 classification of electrical S1

112 1979 Method for determining the HD 214 1980 comparative and the proof S2 tracking indices of solid

227 seriesPolyvinyl chloride insulated HD 21 series (mod) cables of rated voltages up to

245 seriesRubber insulated cables of rated HD 22 series (mod) voltages up to and including 309 1988 Plugs, socket-outlets and EN 60309 1992 (mod) couplers for industrial purposes

320 1981 Appliance couplers for household EN 1987 (mod) and similar general purposes 60320-1

364 seriesElectrical installation of HD 384 series

384-14 1981 Fixed capacitors for use in - - electronic equipment Part 14: Sectional specification: Fixed capacitors for radio interference

6 .

IEC Date Title EN/HD Date 417 1973 Graphical symbols for use on HD 243 1975 equipment S1

664 1980 Insulation co-ordination within - - low-voltage systems including clearances and creepage distances

695-2-2 1980 Fire hazard testing - HD 1983 Needle-flame test 444.2.2

825 1984 Radiation safety of laser HD 482 1988 (mod) products, equipment S1 885-1 1987 Electrical test methods for - - electric cables Part 1: Electrical tests for cables,

ISO Date Title EN/HD Date

216 1975 Writing paper and certain classes EN 20216 1990 of printed matter - Trimmer sizes * 261 1973 ISO General purpose metric screw - - threads General plan

262 1973 ISO General purpose metric screw - - threads Selected sizes for screws, bolts and nuts

3864 1984 Safety colours and safety signs - -

4046 1978 Paper, board, pulp and related - - 7000 1984 Graphical symbols for use on - - equipment Index and synopsis

Other Date Title

EN 1991 Particular electrical safety requirements for 41003 equipment to be connected to telecommunication CFR 47, Code of Federal Regulations (USA) Part 68: Part 68 Connection of terminal equipment to the telephone network (commonly referred to as 'FCC

73/23/EEC Council Directive of 19 February 1973 on the harmonization of the laws of the Member States relating to electrical equipment designed for

7 .

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

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

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. 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-DI, Standard Sheet DK 1-3a, DK 1-5a or DK 1-7a, when

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

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

8 .

3.2.1 In Denmark, supply cords of single-phase appliances having a rated current not exceeding 10 A shall be

Class Plug

Section 107-2-D1 Standard Sheet Protection DK 2-1a, DK2-5a, against indirect I Earthing DKA 2-1a, DK 2-5a, DKA 2-1a, connection not DKA 2-1b,

II DK2-5a**), 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 1 0, I clause 17. I

**)

If poly-phase appliances and single-phase appliances having a rated current exceeding 1 0 A are provided with a supply cord with a plug, this

Class of Plug equipment The Heavy Current The Heavy Current Regulations Section Regulations Section I 107-1-D1, Standard 117, Standard Sheet II Sheet II III DK 6-1a II*) DK 6-1a*) IX

*) The earthing contact not connected.

9 .

3.2.1 In Switzerland, plugs for connection of the power supply cord to primary power have to comply with

3.2.4 In the United Kingdom, a power supply cord with conductor of 1,25 mm² is allowed for equipment with a rated current over 10 A and up to and

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 10 A up to and including 13 A is:

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

5.4.1 In Denmark, circuits which under fault conditions may cause an earth-leakage current having a d.c. content exceeding 20 % of the total earth-leakage current and also exceeding 5 mA, shall be so constructed that the earth-leakage current can occur only when an insulation fault equivalent to

6.1 In Switzerland, protective means in the equipment shall not prevent transient surge protection in the telecommunication network from operating properly (dc. spark-over voltage of the surge

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

6.4.1 In Finland, for pluggable equipment it is forbidden to use surge suppressors between the telecommunication network and conductive metallic

10 .

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 C 59, 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

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

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 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 tilslutning 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

11 .

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

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 'AIIgemeine 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

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

2.8.4 United Kingdom (Health and Safety Executive 2.8.5 Directive) In the UK, authorities responsible for legislation dealing with protection of personnel from exposure to hazards have a particular interpretation of the expression 'extreme hazard' Reference to these authorities is essential.

2.11 Denmark (Heavy Current Regulations) Finland (Decree No. 205/74) A limited power source shall incorporate an isolating transformer and shall comply with the following: · the open-circuit voltage shall not exceed 42,4 V peak d.c. and shall not generate voltages above that value; · the current which may be drawn for more than two

12 .

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 10 V is 50.

5.4.9 Norway (National Building Installation Specification- Feb. 1991) The electric strength test after the tests of 5.4.4, 6.3 Norway (Telegrafloven av 29. April 1899) Dielectric barrier between telecom line terminals and mains terminals: Impulse voltage resistibility To ensure that the equipment can resist high voltage surges which may arise on power conductors from lightning, the equipment must provide an adequate electrical separation between the port provided for connection of the telecommunication network conductors and the mains terminals. Compliance shall be checked by applying to the electrical separation 10/700 ms test impulses (using the impulse generating circuit given in Figure N.1 ) with a test voltage of · Uc= 10 kV for power distribution systems where no surge suppressor is installed ('uncontrolled' situation, see IEC 664) · Uc= 2,5 kV for power distribution systems where surge suppressors are installed. Ten impulses shall be applied with minimum 10 s between consecutive impulses, the polarity being reversed between the impulses. During the test, breakdown through the insulation (with damage of it) shall not occur.

6.4.2.1 Austria (Fernmeldebauvorschrift Teil 11) Equipment shall comply with Uc= 2,0 kV in cases b)

13 .

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 licence is required by those who operate an X-ray emission source.

b)A licence 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 mSv/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 licence 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

iiithe electron acceleration voltage must not exceed the maximum value stipulated by the manufacturer or importer.

d)Furthermore, a licence 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

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