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Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Thu Nov 23 10:19:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BRITISH STANDARD Uninterruptible power systems (UPS) Part 1-2: General and safety requirements for UPS used in restricted access locations The European Standard EN 50091-1-2:1998 has the status of a British Standard ICS 29.200 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW | BS EN | | | 50091-1-2:1999 | | | Incorporating | | Corrigendum No | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Thu Nov 23 10:19:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 50091-1-2:1999 National foreword This British Standard is the English language version of EN 50091-1-2:1998 including corrigendum August 1999 The UK participation in its preparation was entrusted to Technical Committee PEL/22, Static power convertor equipment, which has the responsibility to: Ð aid enquirers to understand the text; Ð present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; Ð monitor related international and European developments and promulgate them in the UK A list of organizations represented on this committee can be obtained on request to its secretary Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled ªInternational Standards Correspondence Indexº, or by using the ªFindº facility of the BSI Standards Electronic Catalogue A British Standard does not purport to include all the necessary provisions of a contract Users of British Standards are responsible for their correct application Compliance with a British Standard does not of itself confer immunity from legal obligations Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages to 27 and a back cover The copyright notice displayed in this document indicates when the document was last issued This British Standard, having been prepared under the direction of the Electrotechnical Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 March 1999 BSI 04-2000 ISBN 580 30474 Amendments issued since publication Amd No Date 10753 April 2000 corrigendum Text affected Change in EN foreword to date of withdrawal (dow) of conflicting national standards Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Thu Nov 23 10:19:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 50091-1-2 EUROPEAN STANDARD NORME EUROPÊENNE EUROPẰISCHE NORM July 1998 ICS 29.020; 29.200 Incorporates corrigendum August 1999 Descriptors: power electronics, uninterruptible power supply, restricted access location, general requirements, safety requirements English version Uninterruptible power systems (UPS) Ð Part 1-2: General and safety requirements for UPS used in restricted access locations Alimentations sans interruption (ASI) Partie 1-2: Prescriptions geÂneÂrales et reÁgles de seÂcurite pour les ASI utilisables dans des locaux d'acceÁs restreint Unterbrechungsfreie Stromversorgungssysteme (USV) Ð Teil 1-2: Allgemeine Anforderungen und Sicherheitsanforderungen fuÈr USV in abgeschlossenen BetriebsraÈumen This European Standard was approved by CENELEC on 1998-01-01 CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard 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 European Standard 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 standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom CENELEC European Committee for Electrotechnical Standardization Comite EuropeÂen de Normalisation Electrotechnique EuropaÈisches Komitee fuÈr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1998 CENELEC Ð All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members Ref No EN 50091-1-2:1998 E Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Thu Nov 23 10:19:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page EN 50091-1-2:1998 Foreword This European Standard was prepared by the Technical Committee CENELEC TC 22X, Power electronics The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 50091-1-2 on 1998-01-01 The following dates were fixed: Ð latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 1998-12-01 Ð latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2000-12-01 This Part 1-2 of EN 50091 deals with the general and safety requirements of uninterruptible power systems, for use in restricted access locations, i.e secure electrical switchrooms and installed, operated and maintained by skilled electrical personnel The relevant general and safety requirements for operator access areas are given in EN 50091-1-1:1996; EMC requirements are given in EN 50091-2:1995; performance requirements are given in ENV 50091-3:1998 This European Standard covers the essential requirements of LVD Directive 73/23/EEC NOTE The following print types are used: Ð requirements: in roman type; Ð test specifications: in italic type; Ð notes: in small roman type This European Standard is to be used in conjunction with EN 60950:1992 and its amendments A1:1993, A2:1993 and A3:1995, Safety of information technology equipment, which is referred to in this document by ªRDº NOTE When reference is made to RD by phrases such as ªThe definitions or the provisions of item/RD applyº, this phrase is intended to mean that the definitions or provisions in that item of EN 60950 apply, except any which are clearly inapplicable to uninterruptible power systems for use in restricted access locations Inappropriate clauses within EN 60950 which relate to operator safety are not referenced, but are replaced by additional text or reference to the relevant provisions of IEC 61140 and/or IEC 60536 BSI 04-2000 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Thu Nov 23 10:19:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page EN 50091-1-2:1998 Contents Foreword General 1.1 Scope 1.2 Normative references 1.3 Definitions 1.4 General requirements 1.5 General conditions for tests 1.6 Components 1.7 Power interfaces 1.8 Marking and instructions Fundamental design requirements 2.1 Protection against electric shock and energy hazards 2.2 Insulation 2.3 Safety Extra-Low Voltage (SELV) Circuits 2.4 Limited current circuits 2.5 Provisions for protective earthing 2.6 A.C and d.c power isolation 2.7 Overcurrent and earth fault protection 2.8 Protection of service personnel 2.9 Clearances, creepage distances and distances through insulation 2.10 External signalling circuits 2.11 Limited power source 2.12 Protection of the applied load 2.13 Connection to other equipment Wiring, connections and supply 3.1 General 3.2 Connection to power sources 3.3 Wiring terminals for external power conductors Physical requirements 4.1 Stability and mechanical hazards 4.2 Mechanical strength and stress relief 4.3 Construction details 4.4 Resistance to fire 4.5 Battery location Thermal and electrical requirements 5.1 Heating 5.2 Earth leakage current 5.3 Electric strength 5.4 Abnormal operating and fault conditions BSI 04-2000 Page Page 4 7 8 10 10 11 12 12 12 12 13 13 Annex A (normative) Test for resistance to heat and fire Annex B (normative) Motor test under abnormal conditions Annex C (normative) Transformers Annex D (normative) Measuring instruments for earth leakage current test Annex E (normative) Temperature rise of a winding Annex F (normative) Measurements of creepage Annex G (normative) Earth leakage current for UPS intended to be connected directly to IT power systems Annex H (informative) Guidance on protection against ingress of water and foreign objects Annex J (informative) Tables of electrochemical potentials Annex K (normative) Thermal controls Annex L (normative) Backfeed protection test Annex M (normative) Reference load conditions Annex N (nornative) Ventilation of battery compartments Annex P (normative) Minimum and maximum cross-sections for copper conductor Annex Q (informative) A-Deviations Annex R (normative) Special national conditions 19 19 19 19 19 19 19 20 19 19 ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ 14 14 14 14 14 14 14 15 15 16 16 16 16 17 17 18 18 18 18 18 21 22 25 26 27 27 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Thu Nov 23 10:19:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page EN 50091-1-2:1998 General 1.1 Scope 1.1.1 This European Standard applies to electronic indirect a.c convertor systems with an electrical energy storage device in the d.c link The primary function of the uninterruptible power system (UPS) covered by this European Standard is to ensure continuity of an alternating power source The uninterruptible power system may also serve to improve the quality of the power source by keeping it within specified characteristics This European Standard is applicable to UPS for use on distribution systems up to 000 V a.c which are movable, stationary, fixed and for building in This European Standard applies to UPS intended to be installed in restricted access locations and specifies requirements to ensure safety for the service personnel This European Standard is intended to ensure the safety of installed UPS, both as a single UPS unit or as a system of interconnected UPS units, subject to installing, operating and maintaining the UPS in the manner prescribed by the manufacturer This European Standard does not cover d.c supplied or a.c supplied electronic lamp control gears, or UPS based on rotating machines NOTE For UPS intended to be used in vehicles, on board ships or aircraft in tropical countries, or on elevations greater than 000 m different requirements may be necessary NOTE For UPS subject to transient overvoltages exceeding those for Overvoltage Category II according to HD 625.1 S1, additional protection might be necessary in the mains supply to the UPS NOTE For UPS intended for use where ingress of water and foreign objects are possible, additional requirements may be necessary; for guidance on such requirements and for relevant testing, see annex H NOTE Manufacturers are reminded that some appliances are sensitive to a distorted waveform of the voltage or current and can be consequently overloaded; while the unsymmetrical or d.c content can bring malfunction of earth leakage circuit breakers: therefore also the requirements of ENV 50091-3: Performance requirements have to be taken into account NOTE Integral components (e.g batteries) shall comply as far as is practicable with their component standards in intended use 1.1.2 Even if this European Standard does not cover all types of UPS, it may be taken as a guide for such UPS Requirements additional to those specified in this European Standard may be necessary for specific applications, e.g Ð UPS intended for operation while exposed, for example, to extremes of temperature; to excessive dust, moisture, or vibration; to flammable gases; to corrosive or explosive atmospheres; Ð electromedical applications with physical connections to the patient 1.2 Normative references This European Standard incorporates by dated or undated references 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 EN 50091-1-1, 1996, Uninterruptible power systems (UPS) Ð Part 1-1: General and safety requirements for UPS used in operator access areas EN 50091-2, 1995, Uninterruptible power systems (UPS) Ð Part 2: EMC requirements ENV 50091-3, 1998, Uninterruptible power systems (UPS) Ð Part 3: Performance requirements and test methods EN 60309-1, 1992, Plugs, socket-outlets and couplers for industrial purposes Ð Part 1: General requirements (IEC 60309-1:1988 + corrigendum March 1992, modified) EN 60309-2, 1992, Plugs, socket-outlets and couplers for industrial purposes Ð Part 2: Dimensional interchangeability requirements for pin and contact-tube accessories of harmonized configurations (IEC 60309-2:1989 + corrigendum April 1992, modified) EN 60439-1, 1994, Low voltage switchgear and controlgear assemblies Ð Part 1: Type-tested and partially type-tested assemblies (IEC 60439-1:1992 + corrigendum December 1993) EN 60445, 1990, Identification of equipment terminals and of terminations of certain designated conductors, including general rules for an alphanumeric system (IEC 60445:1988) EN 60529, 1991, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989) EN 60950, 1992, Safety of information technology equipment + A1 1993 (IEC 60950:1991 + A1:1992 + A2:1993 + A3:1995, modified) + A2 1993 + A3 1995 ENV 61000-2-2, 1993, Electromagnetic compatibility (EMC) Ð Part 2: Environment Ð Section 2: Compatibility levels for low frequency conducted disturbances and signalling in public low voltage power supply systems (IEC 61000-2-2:1990, modified) HD 243 S12, 1995, Graphical symbols for use on equipment Ð Index, survey and compilation of the single sheets (IEC 60417:1973 + supplements A:1974 to M:1994) HD 384.4.41 S2, 1996, Electrical installations of buildings Ð Part 4: Protection for safety Ð Chapter 41: Protection against electric shock (IEC 60364-4-41:1992, modified) ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ BSI 04-2000 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Thu Nov 23 10:19:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page EN 50091-1-2:1998 HD 384.4.42 S1, 1985, Chapter 42: Protection against thermal effects + A2 1994 (IEC 60364-4-42:1980, modified) HD 384.4.46 S1, 1987, Chapter 46: Isolation and switching (IEC 60364-4-46:1981, modified) HD 625.1 S1,1996, Insulation co-ordination for equipment within low voltage systems Ð Part 1: Principles, requirements and tests (IEC 60664-1:1992, modified) IEC 60083, 1975, Plugs and socket-outlets for domestic and similar general use IEC 60146-4, 1986, Semi-conductor convertors Ð Part 4: Method of specifying the performance and test requirements of Uninterruptible power systems IEC 60364-4-482, 1982, Electrical installations of buildings Ð Part 4: Protection for safety Ð Chapter 48: Choice of protective measures as a function of external influences Ð Section 482: Protection against fire IEC 60364-7-707, 1984, Electrical installations of buildings Ð Part 7: Requirements for special installations or locations Ð Section 707: Earthing requirements for the installations of data processing equipment IEC 60536-2, 1992, Classification of electrical and electronic equipment with regard to protection against electric shock Ð Part 2: Guidelines to requirements for protection against electric shock IEC 61140, 1992, Protection against electric shock Ð Common aspects for installation and equipment ISO 7000, 1984, Graphical symbols for use on equipment 1.3 Definitions 1.3.1 General For the purpose of this European Standard, the following definitions apply Where the terms ªvoltageº and ªcurrentº are used, they imply the r.m.s values, unless otherwise specified 1.3.1.4 bypass power path alternative to the indirect a.c convertor 1.3.1.5 power failure any variation in power supply which can cause unacceptable performance of the load equipment 1.3.1.6 primary power power normally continuously available which is usually supplied by an electrical utility company but sometimes by the user's own generator 1.3.1.7 bypass power power supplied via the bypass 1.3.1.8 apparent output power permanent apparent power, the product of the r.m.s output voltage and r.m.s current It is given for a load in VA or kVA, with a specified power factor 1.3.1.9 active power sum of the electrical power at the fundamental frequency and the powers of each harmonic component from the output terminals, in W or kW ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ NOTE Care should be taken that measurement instruments give a true r.m.s reading in the presence of non-sinusoidal signals For other terms and definitions see also IEC 60146-4 1.3.1.1 uninterruptible power system (UPS) combination of convertors, switches and energy storage devices, for example batteries, constituting a power system for maintaining continuity of load power in case of input power failure 1.3.1.2 continuity of load power load power with voltage and frequency within rated steady state and transient tolerance bands; and with distortion and interruptions within the limits specified for the load 1.3.1.3 functional unit basic unit, for example, a rectifier, an inverter or a UPS switch BSI 04-2000 1.3.1.10 load power factor characteristic of an a.c load expressed as the ratio of active power to apparent power 1.3.1.11 peak factor ratio of the peak value to the r.m.s value in steady state 1.3.1.12 rated voltage the input or output supply voltage (for three-phase supply the phase-to-phase voltage) as declared by the manufacturer 1.3.1.13 rated voltage range the input or output supply voltage range as declared by the manufacturer, expressed by its lower and upper rated voltages 1.3.1.14 rated current maximum input or output current of the UPS as declared by the manufacturer 1.3.1.15 rated frequency input or output supply frequency as declared by the manufacturer Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Thu Nov 23 10:19:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page EN 50091-1-2:1998 1.3.1.16 rated frequency range input or output supply frequency range as declared by the manufacturer, expressed by its lower and upper rated frequencies 1.3.1.17 rated apparent output power apparent output power as declared by the manufacturer 1.3.1.18 rated active output power active output power as declared by the manufacturer 1.3.1.19 backfeed condition where a proportion of the voltage or energy available within the UPS is fed back to any of the input terminals, either directly or by a leakage path 1.3.2 Operating conditions 1.3.2.1 reference load mode of operation which approximates as closely as possible to the most severe conditions of normal use in accordance with the manufacturer's operating instructions; however, when the conditions of actual use can obviously be more severe than the maximum load conditions recommended by the manufacturer, a load shall be used that is representative of the maximum that can be applied NOTE For examples of reference load conditions for UPS, see annex M 1.3.2.2 linear load load where the current drawn from the supply is defined by the relationship: I = U/Z where I is the load current; U is the supply voltage; Z is the load impedance 1.3.2.3 non-linear load load where the parameter Z (load impedance) is no longer a constant but is a variable dependent on other parameters, such as voltage or time (see annex M) 1.3.2.4 stand-by power power intended to replace primary power in the event of primary power failure 1.3.2.5 stored energy mode operation of the UPS when supplied by the following conditions: Ð primary power is disconnected or is out of a given tolerance; Ð battery is being discharged; Ð load is within the given range; Ð output voltage is within the given tolerance 1.3.2.6 stored energy time minimum time during which the UPS will ensure continuity of load power, under specified service conditions when the primary power fails, starting with the energy storage means being charged according to 1.3.2.7 and at the commencement of its service life 1.3.2.7 restored energy time maximum time required to recharge sufficiently the energy storage means of the UPS with the charging capacity installed (after a discharge as specified in 1.3.2.6 with the UPS operating under specified service conditions) to ensure another such a discharge NOTE This period is the time taken after a stored energy time discharge to restore sufficient energy to repeat the stored energy time discharge ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ 1.3.3 UPS mobility The definitions of 1.2.3/RD apply 1.3.4 Classes of UPS The definitions of 1.2.4/RD apply 1.3.5 Connections The definitions of 1.2.5/RD apply together with the following: 1.3.5.1 power cord flexible cord or cable for interconnection purposes 1.3.6 Enclosures The definitions of 1.2.6/RD apply 1.3.7 Accessibility The definitions of 1.2.7.2/RD, 1.2.7.3/RD and 1.2.7.4/RD apply NOTE Restricted access location within the meaning of this European Standard is defined as secure electrical switchrooms or similar locations where access is excluded to all other persons other than skilled electrical personnel 1.3.8 Circuits and circuit characteristics The definitions of 1.2.8/RD apply together with the following: NOTE Refer to clause on fundamental design requirements relating to the use of SELV circuits BSI 04-2000 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Thu Nov 23 10:19:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page EN 50091-1-2:1998 1.3.9 Insulation The definitions of 1.2.9/RD apply 1.3.10 Creepage distances and clearances The definitions of 1.2.10/RD apply 1.3.11 Components The definitions of 1.2.11/RD apply 1.3.12 Power distribution The definitions of 1.2.12/RD apply 1.3.13 Flammability The definitions of 1.2.13/RD apply 1.3.14 Miscellaneous The definitions of 1.2.14.2/RD, 1.2.14.3/RD, 1.2.14.4/RD, 1.2.14.7/RD and 1.2.14.8/RD apply together with the following: 1.3.14.1 type test The definition of 1.2.14.1/RD applies together with the following 1.4.2 User information Sufficient information shall be provided to the user concerning any condition necessary to ensure that the UPS will not present a hazard within the meaning of this European Standard when used as prescribed by the manufacturer (see 1.7) Compliance is checked by inspection 1.4.3 Classification of UPS UPS covered by this European Standard is classified according to its protection from electric shock as Class I 1.5 General conditions for tests The provisions of 1.4.1/RD, 1.4.2/RD, 1.4.3/RD, 1.4.6/RD, 1.4.7/RD, 1.4.8/RD, 1.4.10/RD, 1.4.11/RD and 1.4.12/RD apply together with the following 1.5.1 Except where specific test conditions are stated elsewhere in the European Standard and, where it is clear that there is a significant impact on the results of the test, the tests shall be carried out under the most unfavourable combination within the manufacturer's operating specifications of the following parameters: Ð supply voltage; Ð absence of supply voltage; Ð supply frequency; Ð charge condition of the battery; Ð physical location of UPS and position of movable parts; Ð operating mode ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ NOTE Purchasers should note that for physically large UPS units and/or power ratings adequate test facilities to demonstrate some of the type tests may not exist, or not be economically viable This situation also applies to some electrical tests for which no commercially available test simulation equipment is available or require specialized test facilities beyond the scope of a manufacturer's premises Where these situations exist, the manufacturer may elect to either: 1) Use a certified test house to carry out testing for compliance on his behalf Evidence of third party certification shall be deemed sufficient to prove compliance with the relevant clauses 2) Demonstrate that the design is compliant by calculation or by experience and/or testing of similar designs in similar conditions For testing of parameters other than those listed as routine, it shall be a matter of agreement between the manufacturer and the purchaser as a contract condition 1.4 General requirements 1.4.1 UPS design and construction A UPS shall be so designed and constructed that, under conditions of normal use and likely fault conditions, it protects against risks of personal injury from electric shock and other hazards, and against serious fire originating in the UPS or connected loads, within the meaning of this European Standard Where the UPS involves safety situations not specifically covered, the design should provide a level of safety not less than that generally afforded by this European Standard Unless otherwise specified, compliance is checked by inspection and by carrying out all the relevant tests NOTE The need for additional detailed requirements to cope with a new situation should be brought promptly to the attention of the appropriate committee BSI 04-2000 1.5.2 In determining the most unfavourable supply voltage for a test, the following variables shall be taken into account: Ð multiple rated voltages; Ð extremes of rated voltage ranges; Ð tolerance on rated voltage as specified by the manufacturer If a tolerance is not specified, the requirements of 1.6.5/RD apply 1.5.3 In determination of input current, and where other test results could be affected, the following variables shall be considered and adjusted to give the most unfavourable results: Ð loads due to recharging of batteries; Ð loads due to optional features, offered or provided for by the manufacturer for inclusion in or with the equipment under test; Ð loads due to other units of equipment intended by the manufacturer to draw power from the UPS under test NOTE Artificial loads may be used to simulate such loads during testing Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Thu Nov 23 10:19:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page EN 50091-1-2:1998 1.6 Components The provisions of 1.5.1/RD, 1.5.2/RD, 1.5.3/RD, 1.5.4/RD and 1.5.5/RD apply together with the following 1.6.1 Components related to safety incorporated in the UPS shall comply with the relevant European or IEC Standards The components shall be suitable for the particular application, i.e their rated voltages; rated currents; service life; making and breaking capacities; short circuit withstand, etc Components having a short circuit withstand strength and/or a breaking capacity which is insufficient to withstand the stresses likely to occur at the place of installation, shall be protected by means of current limiting protective devices, for example, fuses or circuit breakers When selecting current limiting protective devices for built-in switching devices, account shall be taken of the maximum permissible values specified by the manufacturer of the device, having due regard to co-ordination 1.7 Power interfaces The provisions of 1.6.4/RD and 1.6.5/RD apply together with the following 1.7.1 The neutral conductors, if any, shall be insulated from earth and the body throughout the UPS, as if they were a phase conductor Components connected between neutral and earth shall be rated for a proper working voltage depending on the configuration In the case of the output neutral conductor being isolated from the input neutral conductor, the service personnel responsible for the installation shall connect this output neutral conductor to earth, if permitted by local wiring rules and if so detailed in the installation instructions Compliance is checked by inspection 1.8 Marking and instructions 1.8.1 Rating plates UPS shall be provided with adequate markings in order to specify: Ð input supply requirements; Ð output supply ratings The UPS shall be provided with one or more rating plates marked in a durable manner If located on an outside surface of fixed UPS, the marking shall be discernible after the UPS has been installed as in normal use Markings that are not visible from the outside of the UPS are considered to be in compliance if they are directly visible when opening a door or cover The markings of input and output shall include the following: Ð rated voltage(s) or rated voltage range(s), in V The voltage range shall have a hyphen (-) between the minimum and maximum rated voltages When multiple rated voltages or voltage ranges are given, they shall be separated by a solidus (/) NOTE Some examples of rated voltage markings are Ð Rated voltage range: 220 V to 240 V This means that the UPS is designed to be connected to any supply having a nominal voltage between 220 V and 240 V Ð Multiple rated voltage: 120/220/240 V This means that the UPS is designed to be connected to a supply having a nominal voltage of 120 V, 220 V or 240 V, usually after internal adjustment If UPS is to be connected to both phase conductors and the neutral conductor of a single-phase, 3-wire power system, the marking shall give the line-to-neutral voltage and the line-to-line voltage, separated by a solidus, with the added notation ªThree wires plus protective earthº; ª3W +PEº or equivalent NOTE Some examples of the above system rating markings are: Ð 120/240 V: wire +PE; Ð 120/240 V: W + ; Ð 120/240 V: W + N +PE; Ð symbol for nature of supply, for d.c only; Ð rated frequency or rated frequency range, in Hz, unless the UPS is designed for d.c only; Ð rated current, in A For UPS with multiple rated voltages, the corresponding rated currents shall be marked such that the different current ratings are separated by a solidus (/) and the relation between rated voltage and associated rated current appears distinctly UPS with a rated voltage range shall be marked with either the maximum rated current, or with the current range ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ NOTE If a UPS is not provided with a means for direct connection to the supply mains, it need not be marked with its rated current Ð number of phases with or without neutral; Ð output rated active power, in W or kW according to annex M; Ð output rated apparent power, in VA or kVA according to annex M; Ð maximum ambient operating temperature range (optional); ± stored energy time, in or h at rated output active power and at ambient temperature 25 8C (optional); Ð manufacturer's name, trade mark or identification mark; Ð manufacturer's model or type reference NOTE Additional markings are allowed, provided they not give rise to misunderstanding Where symbols are used, they shall conform with ISO 7000 and HD 243, where appropriate symbols exist 1.8.2 Safety instructions The manufacturer shall specify in his document or catalogue the conditions, if any, for the installation, operation and maintenance of the UPS Where UPS are designed for restricted access locations only (not meeting the requirements for a fire enclosure as specified in 1.2.6.2/RD), the installation instructions shall clearly state the UPS only be installed in accordance with the requirements of HD 384.4.42 S1/A2, Chapter 42: Protection against thermal effects, and IEC 60364-4-482, Chapter 482: Protection against fire BSI 04-2000 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Thu Nov 23 10:19:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 14 EN 50091-1-2:1998 2.8.4 Parts at hazardous voltage or energy level, located on the rear side of a door, shall be guarded or insulated to reduce the likelihood of unintentional contact of the live parts by service personnel Compliance with 2.8.2, 2.8.3, 2.8.4 is checked by inspection, measurement and use of the test finger (Figure 19/RD) 2.8.5 A component that requires inspection, resetting, adjustment, servicing or maintenance while energized shall be so located and mounted with respect to other components and with respect to grounded metal parts that it is accessible for electrical service functions and to minimize the risk of electric shock or energy hazards, high current or injury to persons by adjacent moving parts Access to a component shall not be impeded by other components or wiring Compliance is checked by inspection 2.8.6 For an adjustment that is to be made with a screwdriver or similar tool when the UPS is energized, the requirement in 2.8.5 necessitates that protection be provided so that inadvertent contact with adjacent uninsulated hazardous live parts involving a risk of electric shock or hazardous energy level is unlikely, taking into consideration that misalignment of the tool with the adjustment can result when an adjustment is attempted This protection shall be provided by: 1) location of the adjustment means away from uninsulated hazardous live parts; or 2) a guard to reduce the likelihood of the tool from contacting uninsulated live parts Compliance is checked by inspection and fault simulation 2.8.7 Moving parts that can cause injury to persons during service operations shall be located or protected so that unintentional contact with the moving parts is not likely 2.8.8 Capacitor banks shall be fitted with a means of discharge for protection of service personnel A warning label shall be added if discharge time exceeds 1,0 s, stating the time taken to reduce the hazard to a safe level (not greater than min), as defined in 1.2.8.3/RD and 1.2.8.7/RD 2.8.9 Internal batteries shall be so arranged to minimize risk of electric shock from inadvertent contact with terminals and the interconnection method shall be such as to minimize risk of short circuiting and electric shock during servicing and replacement Compliance with 2.8.7, 2.8.8, 2.8.9 is checked by inspection 2.9 Clearances, creepage distances and distances through insulation The provisions of 2.9.1/RD, 2.9.2/RD, 2.9.3/RD, 2.9.4/RD, 2.9.5/RD, 2.9.6/RD, 2.9.7/RD, 2.9.8/RD apply 2.10 External signalling circuits Operator accessible connections for external signalling circuits shall comply with the requirements of 2.3 Examples of such circuits are remote controls or interfaces for computers If the separation between the mains and an external signalling circuit relies upon connection to the safety earth, the UPS shall have a connection to earth Compliance is checked by inspection 2.11 Limited power source The provisions of 2.11/RD apply 2.12 Protection of the applied load The UPS shall be so designed to prevent the possibility of excessive a.c or d.c voltage being applied to the load between any pair of phases or between any one phase and neutral or protective earth To prevent the load being supplied with excessive over and under voltages outside their design range, the output voltage variation shall remain within the tolerances of 1.6.5/RD unless designed for a specific application where other tolerances apply NOTE Particular attention shall be given during testing to either or both of the following conditions Ð The period when the UPS unit is resynchronizing with a source supply, if this feature is part of the design Ð The possibility of reversing the phase conductors where such conductors are not clearly defined, either by use of a non-polarized plug or where the electrical installation requirements not define the connection of the phase conductors to the appropriate connection points of a polarized plug/socket combination ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ Compliance is checked by measurement and inspection 2.13 Connection to other equipment The provisions of 2.10/RD apply Wiring, connections and supply 3.1 General The provisions of 3.1/RD apply, together with the following 3.1.1 Supply leads to apparatus and measuring instruments in covers or doors shall be so installed that no mechanical damage can occur to conductors as a result of movement of these covers or doors 3.1.2 Neutral conductors in three-phase UPS shall be rated to take account of harmonic currents summating in this conductor as a result of single phase loads 3.1.3 Generally only one conductor shall be connected to a terminal, the connection of two or more conductors is permissible only in those cases where terminals are designed for this purpose 3.1.4 Dimensions and ratings of busbars and insulated conductors The choice of cross sections of conductors inside the UPS is the responsibility of the manufacturer In addition to the current which must be carried, the choice is governed by the mechanical stresses to which the UPS is subjected, by the way the conductors are laid, by type of insulation and, if applicable, by the kind of elements connected (e.g electronics) BSI 04-2000 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Thu Nov 23 10:19:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 15 EN 50091-1-2:1998 3.2 Connection to power sources The provisions of 3.2.2/RD, 3.2.3/RD, 3.2.4/RD, 3.2.5/RD, 3.2.6/RD, 3.2.8/RD apply together with the following 3.2.1 For safe and reliable connection to a primary power supply, UPS shall be provided with one of the following: Ð terminals for permanent connection to the supply; Ð a non-detachable power supply cord for permanent connection to the supply, or for connection to the supply by means of a plug; Ð an appliance inlet for connection of a detachable power supply cord Where UPS are provided with more than one supply connection (e.g with different voltages or frequencies or as a redundant power), and for UPS output and battery connections, the design shall be such that all of the following conditions are met: Ð separate means of connection are provided for different circuits; Ð supply plug connections, if any, are not inter-changeable if a hazard could result from incorrect attachment Compliance is checked by inspection Where aluminium conductors are used, terminals which cater for the maximum sizes of conductors given in column C of Table P.1 are usually dimensionally adequate In those instances where the use of this maximum size of aluminium conductor prevents the full utilisation of the rated current of the circuit, it will be necessary, subject to agreement between manufacturer and user, to provide means of connection for an aluminium conductor of the next larger size In the case where external conductors for electronic circuits with low level currents (less than A and less than 50 V a.c or d.c.) have to be connected to the UPS, Table P.1 does not apply (see note annex P) 3.3.4 The available wiring space shall permit proper connection of the external conductors if the indicated material and, in the case of multicore cables, spreading of the cores The conductors must not be subjected to stresses which reduce their normal life Unless otherwise agreed between manufacturer and user, on three-phase and neutral circuits, terminals for the neutral conductor shall allow the connection of copper conductors having a current-carrying capacity: Ð equal to half the current-carrying capacity of the phase conductor, with a minimum of 16 mm2, if the size of the phase conductor exceeds 16 mm2; Ð equal to the full current-carrying capacity of the phase conductor if the size of the latter is less than or equal to 16 mm2 ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ 3.3 Wiring terminals for external power conductors The provisions of 3.3.1/RD, 3.3.2/RD, 3.3.3/RD, 3.3.4/RD, 3.3.7/RD, 3.3.8/RD, 3.3.9/RD apply together with the following 3.3.1 Provision shall be made for the securement of external power cable glands and accessories, i.e metal/ wire sheaths to prevent movement of the cable in its installed condition Compliance is checked by inspection, by measurement and by fitting the smallest and largest cross-sectional areas of the appropriate range in annex P 3.3.2 The manufacturer shall indicate if the terminals are suitable for connection of copper or aluminium conductors or both The terminals shall be such that the external conductors may be connected by a means (screws, connectors, etc.) which ensures that the necessary contact pressure corresponding to the current rating and the short-circuit strength of the apparatus and the circuit is maintained 3.3.3 In the absence of a special agreement between manufacturer and user, terminals shall be capable of accommodating conductors and cables of copper from the smallest to the largest cross-sectional areas corresponding to the appropriate rated current (see annex P) BSI 04-2000 NOTE For conductors other than copper conductors, the above cross-sections should be replaced by cross-sections of equivalent conductivity, which may require larger terminals NOTE For certain applications in which the current in the neutral conductor may reach high values, for example, large installations, a neutral conductor having the same current-carrying capacity as the phase conductors may be necessary, subject to special agreement between manufacturer and user 3.3.5 If connecting facilities for incoming and outgoing neutral, protective and PEN conductors are provided, they shall be arranged in the vicinity of the associated phase conductor terminals 3.3.6 Openings in cable entries, cover plates, etc shall be so designed that when the cables are properly installed, the stated protective measures against contact and degree of protection shall be obtained This implies the selection of means of entry suitable for the application as stated by the manufacturer Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Thu Nov 23 10:19:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 16 EN 50091-1-2:1998 Physical requirements The frame or chassis of a UPS unit shall not be used to carry current during intended operation NOTE The frames or chassis connected to earth ground can carry current during an electric malfunction or leakage currents A part, such as a dial or nameplate, that serves as a functional part of the enclosure shall comply with the enclosure requirements Individual modules of a modular UPS unit may be of open construction Ð either no enclosure or partial enclosure is supplied Ð provided that when the modules are assembled together in the field as intended, the UPS unit enclosure complies with the requirements in 2.1 Identification of the modules and electrical connections between modules shall comply with clause The enclosure shall protect the various parts of the UPS units The parts of an enclosure that are required to be in place to comply with the requirements for electric shock, injury to persons and hazardous energy level shall comply with the applicable enclosure requirements specified in this European Standard Compliance is checked by inspection 4.1 Stability and mechanical hazards The provisions of 4.1.2/RD, 4.1.3/RD, 4.1.4/RD, 4.1.5/RD apply together with the following Under conditions of normal use, UPS units shall not become physically unstable to the degree that they may become a hazard to service personnel If a reliable stabilising means is used to improve stability when drawers, doors, etc., are opened, it shall be automatic in operation when associated with use Where it is not automatic, suitable and conspicuous markings shall be provided to caution service personnel Compliance is checked by the following five tests, where relevant Each test is carried out separately During the tests, containers shall contain the amount of substance within their rated capacity producing the most disadvantageous condition Castors, if used in the normal operation of the UPS, shall be in their most unfavourable position Ð A UPS shall not overbalance, with or without batteries installed, in whatever represents the most severe of the following conditions Ð A UPS shall not overbalance when tilted to an angle of 108 from its normal upright position Drawers, doors, etc shall be closed during this test Ð A floor-standing UPS shall not overbalance when a force equal to 20 % of the weight of the UPS, but more than 250 N, is applied in any direction except upward, at the most unfavourable height not exceeding m from the floor, with jacks in place (if used under normal conditions) and with all doors, drawers, etc which are intended to be opened by the operator in their most unfavourable position Ð A UPS m or more in height and having a mass of 25 kg or more shall not overbalance when a force equal to 20 % of the weight of the UPS, but not more than 250 N, is applied in any direction except upward, at the most unfavourable height not exceeding m from the floor, with jacks in place (if used under normal conditions) and all doors, drawers, etc which may be moved for any servicing in their most unfavourable position Ð A floor-standing UPS shall not overbalance when a constant downward force of 800 N is applied at the point of maximum moment to any horizontal working surface or surface offering an obvious foothold at a height not exceeding m from the floor Doors, drawers, etc shall be closed during this test NOTE Where UPS are designed to be fixed together on site and not used individually, the stability of individual UPS units need not be considered These requirements are not applicable when the installation instructions for a UPS specify that the UPS is to be secured to the building structure before operation 4.2 Mechanical strength and stress relief The provisions of 4.2.1/RD, 4.2.3/RD, 4.2.4/RD, 4.2.6/RD and 4.2.7/RD apply ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ 4.3 Construction details The provisions of 4.3.5/RD, 4.3.7/RD, 4.3.8/RD, 4.3.9/RD, 4.3.10/RD, 4.3.11/RD, 4.3.13/RD, 4.3.17/RD, and 4.3.21/RD apply together with the following 4.3.1 The minimum protection degree IP20 shall be provided for enclosures when installed in accordance with manufacturer's instructions unless a greater level of protection is stated by the manufacturer Moving parts, such as roof-mounted cooling fans shall also be guarded against personal injury unless this protection is provided by final installation extraction ducting The roof of the enclosure shall be constructed to conform with the manufacturers declared IPXX rating with regard to ingress of liquids Compliance is checked by inspection and with the test finger, except where a greater level of protection is declared and the test finger replaced by the appropriate test method in EN 60529 4.3.2 The requirements of 4.3.1 apply also to any opening in the side of an electrical enclosure Compliance is checked by inspection and with the test finger, except where a greater level of protection is declared and the test finger replaced by the appropriate test method in EN 60529 4.3.3 UPS that, in normal use, contain batteries, shall incorporate adequate safeguards against the risk of dangerous gas concentration and dangerous internal or external spillage NOTE See also 4.5 Compliance is checked by inspection BSI 04-2000 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Thu Nov 23 10:19:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 17 EN 50091-1-2:1998 4.3.4 UPS provided with castors to enable easy movement to installed position and intended to have rigid fixed wiring shall have an additional method to ensure they not move when installed Brakes on wheels are not deemed sufficient to meet this requirement Compliance if checked by inspection 4.4 Resistance to fire UPS subject to installation restrictions of 1.8.2 shall meet the minimum requirements of 4.4.2/RD UPS intended for installation in both operator accessible and restricted access locations shall meet the requirements of EN 50091-1-1, 4.4 NOTE Batteries shall have a flammability Class HB (see annex A/RD) or better 4.5 Battery location Batteries for use with UPS require separated or closed locations They may be designed as: Ð separate battery rooms or buildings; Ð separate cabinets or compartments indoor or outdoor; Ð battery bays or compartments within the UPS 4.5.1 General requirements for installation Batteries shall be installed taking into account the following requirements Ð Accessibility and maintainability: Battery poles and battery connectors shall be accessible so that their fixings can be tightened with the correct tools Batteries with liquid electrolyte must be so located that the battery cell caps are accessible for electrolyte tests and readjusting of electrolyte levels Compliance is checked by inspection and application of the tools and measuring equipment supplied or recommended by the battery manufacturer Ð Protection against ingress of dust, solid objects and moisture: Minimum protection degree IP20 shall be provided for cabinets and compartments Compliance is checked with the relevant tests in EN 60529 Ð Temperature range: Under rated operating conditions, the battery shall not exceed its safe operating temperature range The battery temperature shall remain within the range of +10 8C to +40 8C Occasionally these values may be exceeded, but not beyond the following limits, if not otherwise stated by the battery manufacturer Temperature differences between separate blocks of the battery shall be less than 10 K Compliance is checked by measurements under normal ambient temperature and full load conditions Ð Vibrations: Protection against vibration shall be provided according to the battery manufacturer's instructions Compliance is checked by inspection Ð Distance: Battery cells, whose casing is constructed of insulating material or which are enclosed by an insulating cover, may be mounted without any distance to each other provided the stated ventilation and battery temperature requirements are met Compliance is checked by inspection Ð Insulation: NiCd cells in conductive casings require adequate insulation between each other and to cabinets or compartments Such insulation shall meet the requirements of 2.2 Compliance is checked by test Ð Wiring: Contacts, connections and wiring must be protected against effects of ambient temperature, moisture, gas, vapour and mechanical stress according to clause Compliance is checked by inspection and test Ð Electrolyte spillage: Batteries require adequate protection against electrolyte spillage, i.e electrolyte resistive coating of battery trays and cabinets Not applicable to VRLA type batteries Compliance is checked by inspection Ð Ventilation: Proper ventilation shall be provided so that any potential explosive mixtures of hydrogen and oxygen are dispersed safely below hazardous levels For battery compartments (separate or combined) the calculation method of the necessary airflow to ensure adequate dissolution levels is given in annex N In combined apparatus of battery and electrical components, attention shall be given to prevent ignition of local concentrations of hydrogen and oxygen by adjacent operational arcing parts, such as contactors and switches close to battery vents/valves This shall be achieved by the use of fully enclosed components or separation of battery compartments or adequate ventilation dependent upon the technical construction of the UPS and battery The sufficiency of the distance between battery vents/valves and any open arcing component shall be demonstrated by the manufacturer with technical data for the construction of the UPS under test For battery rooms, proper information on the required flow of air shall be provided in the installation instructions where the battery installation is supplied with the UPS Compliance is checked by inspection, calculation and measurement ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ Type of battery Temperature limits: Minimum Maximum Lead/Acid 25 8C +55 8C NiCd 220 8C +50 8C NOTE A continuous temperature exceeding 25 8C will reduce the life of the battery whilst a low temperature will result in a reduced stored energy time BSI 04-2000 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Thu Nov 23 10:19:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 18 EN 50091-1-2:1998 Ð Charging voltages: Batteries shall be automatically protected against excessive voltages under any single fault condition, e.g due to a charger failure by switching off the charger or interrupting the charging current The charging voltage limits shall be as declared by the manufacturer Compliance is checked by circuit evaluation and a performance test Thermal and electrical requirements 5.1 Heating The provisions of 5.1/RD apply 5.2 Earth leakage current The provisions of 5.2.1./RD, 5.2.2/RD, 5.2.3/RD, 5.2.4/RD, 5.2.5/RD apply together with the following 5.2.1 Where the earth leakage current exceeds 3,5 mA the requirements of 5.2.5/RD shall apply Where the circuit configuration is such that in any mode of operation the UPS protective earth conductor will carry the sum of the UPS and connected load earth leakage currents, the UPS shall meet the requirements of 5.2.2/RD Compliance is checked by inspection and by the relevant tests 5.2.2 UPS classified as pluggable Type B shall have a non-detachable power supply cord meeting the requirements of 3.2.5/RD Compliance is checked by inspection 5.3 Electric strength The provisions of 5.3.1/RD, 5.3.2/RD apply 5.4 Abnormal operating and fault conditions The provisions of 5.4.2/RD, 5.4.3/RD, 5.4.4/RD, 5.4.5/RD, 5.4.8/RD, 5.4.9/RD, 5.4.10/RD apply together with the following 5.4.1 UPS shall be so designed that the risk of fire or electric shock due to mechanical or electrical overload or failure, or due to abnormal operation or careless use, is limited as far as practicable After abnormal operation or a fault, the UPS shall remain safe within the meaning of this European Standard, but it is not required that the UPS should still be in full working order It is permitted to use fusible links, thermal cut-outs, overcurrent protection devices and the like to provide adequate protection Compliance is checked by inspection and by the tests of 5.4 If more than one of the tests is applicable to the same UPS, these tests are made consecutively At the start of each test, the UPS is operating normally If a component or sub-assembly is so enclosed that short circuit or disconnection as specified in this clause is not practicable or is difficult to perform without damaging the UPS, it is permitted to make the tests on sample parts provided with special connecting leads If this is not possible or not practical, the component or sub-assembly as a whole shall pass the tests 5.4.2 For components and circuits other than those covered by 5.4.2/RD, 5.4.3/RD and 5.4.5/RD, compliance is checked by simulating the following conditions: Ð faults in any components in primary circuits; Ð faults in any components where failure could adversely affect supplementary or reinforced insulation; Ð additionally, for UPS that not comply with the requirements of 4.4.2/RD and 4.4.3/RD, faults in all components; Ð faults arising from connection of the most unfavourable load impedance to terminals and connectors that deliver power or signal outputs from the UPS, other than mains power outlets Where there are multiple outlets having the same internal circuitry, the test needs to be made only to one sample outlet For components in primary circuits associated with the mains input and output, such as the supply cord, appliance couplers, RFI filtering components, bypass, switches and their interconnecting wiring, no fault is simulated, provided that the component complies with 5.5.4 a)/RD The UPS, circuit diagrams and component specifications shall be examined to determine those fault conditions that might reasonably be expected to occur ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ NOTE Examples are short circuits and open circuits of transistors, diodes and capacitors (particularly the electrolytic capacitors), faults causing continuous dissipation in resistors designed for intermittent dissipation, and internal faults in integrated circuits causing excessive dissipation The tests are applied one at a time with the UPS operating at rated voltage or at the upper limit of the rated voltage range It is permitted to test circuits within the UPS, or to test simulated circuits, separate components or sub-assemblies outside the UPS In addition to the compliance criteria given in 5.4.8/RD temperatures in the transformer supplying the component under test shall not exceed those specified in annex C/RD and account shall be taken of the exception detailed in such annex 5.4.3 UPS shall be tested by applying any condition that may be expected in normal use and foreseeable misuse, with the UPS operating at rated voltage or at the upper limit of the rated voltage range NOTE Examples of normal use or foreseeable misuse conditions are: Ð covering of groups of ventilating openings that are likely to be restricted, for example, by air filter or ventilation clogged with dirt or failure of cooling fans; Ð operation under any output overload conditions, including a short circuit In addition, UPS which is provided with a protective covering shall be tested with the covering in place under normal idling conditions until steady conditions are established BSI 04-2000