Environmental Engineering (EE) - Power supply interface at the input to telecommunications and datacom (ICT) equipment - Part 3: Operated by rectified current source, alternating current source or direct current source up to 400 V - Sub-part 1: Direct current source up to 400 V

Definition of DC interface up to DC 400V

Okoljski inženiring (EE) - Napajalni vmesnik na vhodu v telekomunikacijsko in podatkovno-komunikacijsko opremo - 3. del: Napajanje z usmerjenim tokovnim virom, izmenično napetostjo ali enosmerno napetostjo do 400 V - 1. poddel: Enosmerna napetost do 400 V

Ta dokument zajema zahteve za:
zmogljivost izhoda napajalne opreme v vmesniku A3;
vhod telekomunikacijske in podatkovno-komunikacijske opreme, povezane z vmesnikom A3.
Napetost v vmesniku A3, opredeljena v tem dokumentu, je enosmerna napetost med 260 V in 400 V.
Enosmerno napajanje lahko zagotavlja baterijska rezerva enosmernega napajalnega sistema.
Cilj tega dokumenta je zagotavljanje združljivosti med napajalno opremo ter telekomunikacijsko in podatkovno-komunikacijsko opremo in različnimi napajalnimi enotami, povezanimi s takim vmesnikom A3 (npr. enota za nadzor/spremljanje, hladilni sistem itd.).
Namen tega dokumenta je:
opredeliti napajalni sistem z enakimi karakteristikami za vso telekomunikacijsko in podatkovno-komunikacijsko opremo, ki je določena za področje uporabe; področje uporabe je lahko katera koli lokacija, na kateri se uporablja vmesnik A3, tj. telekomunikacijska središča, radijske bazne postaje, podatkovna središča in prostori strank;
omogočiti medsebojno delovanje različnih (vrst) napajalnih enot;
omogočiti standardizacijo napajalnih sistemov za telekomunikacijsko in podatkovno-komunikacijsko opremo;
omogočiti nameščanje, delovanje in vzdrževanje telekomunikacijske in podatkovno-komunikacijske opreme ter sistemov različnih izvorov v istem omrežju.
Splošne zahteve za varnost in elektromagnetno združljivost so zunaj področja uporabe te skupine dokumentov, razen če posebne zahteve niso opredeljene v obstoječih varnostnih standardih ali standardih za elektromagnetno združljivost.

General Information

Status
Published
Publication Date
12-Mar-2012
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
29-Feb-2012
Due Date
05-May-2012
Completion Date
13-Mar-2012

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Environmental Engineering (EE) - Power supply interface at the input to telecommunications and datacom (ICT) equipment - Part 3: Operated by rectified current source, alternating current source or direct current source up to 400 V - Sub-part 1: Direct current source up to 400 V35.200Vmesniška in povezovalna opremaInterface and interconnection equipment19.040Preskušanje v zvezi z okoljemEnvironmental testingICS:Ta slovenski standard je istoveten z:EN 300 132-3-1 Version 2.1.1SIST EN 300 132-3-1 V2.1.1:2012en01-april-2012SIST EN 300 132-3-1 V2.1.1:2012SLOVENSKI

STANDARD
SIST EN 300 132-3-1 V2.1.1:2012

ETSI EN 300 132-3-1 V2.1.1 (2012-02) Environmental Engineering (EE); Power supply interface at the input to telecommunications and datacom (ICT) equipment; Part 3: Operated by rectified current source, alternating current source or direct current source up to 400 V; Sub-part 1: Direct current source up to 400 V

European Standard SIST EN 300 132-3-1 V2.1.1:2012
ETSI ETSI EN 300 132-3-1 V2.1.1 (2012-02)2

Reference REN/EE-02017-1 Keywords environment, interface, power supply ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: +33 4 92 94 42 00
Fax: +33 4 93 65 47 16

Siret N° 348 623 562 00017 - NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N° 7803/88

Important notice Individual copies of the present document can be downloaded from: http://www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at http://portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: http://portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media.

© European Telecommunications Standards Institute 2012. All rights reserved.

DECTTM, PLUGTESTSTM, UMTSTM and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE™ are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association. SIST EN 300 132-3-1 V2.1.1:2012

ETSI ETSI EN 300 132-3-1 V2.1.1 (2012-02)3 Contents Intellectual Property Rights ................................................................................................................................ 5 Foreword ............................................................................................................................................................. 5 1 Scope ........................................................................................................................................................ 6 2 References ................................................................................................................................................ 6 2.1 Normative references ......................................................................................................................................... 6 2.2 Informative references ........................................................................................................................................ 7 3 Definitions, symbols and abbreviations ................................................................................................... 7 3.1 Definitions .......................................................................................................................................................... 7 3.2 Symbols .............................................................................................................................................................. 8 3.3 Abbreviations ..................................................................................................................................................... 8 4 Interface A3 .............................................................................................................................................. 9 5 DC interface requirements ........................................................................................................................ 9 5.1 Nominal voltage ................................................................................................................................................. 9 5.2 Normal service voltage range at interface A3 .................................................................................................. 10 5.3 Normal operating voltage range at interface A3............................................................................................... 10 5.4 Reference test voltage (UT) at interface A3 ...................................................................................................... 10 5.5 Abnormal service voltage ranges at interface A3 ............................................................................................. 10 6 Abnormal conditions: Voltage variations, voltage dips, short interruptions and voltage surges at interface A3 ............................................................................................................................................ 11 6.1 Voltage variations............................................................................................................................................. 11 6.2 Voltages dips .................................................................................................................................................... 12 6.3 Short interruptions ............................................................................................................................................ 12 6.4 Voltage surges .................................................................................................................................................. 12 7 DC Supply protection ............................................................................................................................. 14 8 Maximum steady state current ............................................................................................................... 14 8.1 Maximum steady state current Im, in the normal service voltage range ........................................................... 14 8.2 Maximum steady state current in the abnormal service voltage range ............................................................. 14 9 Inrush current on connection to interface A3 ......................................................................................... 14 9.1 Limits ............................................................................................................................................................... 14 9.2 Measurements ................................................................................................................................................... 16 10 Earthing and Bonding ............................................................................................................................. 16 11 Electrical Safety requirements ................................................................................................................ 16 12 EMC requirements at the input of telecommunications and datacom (ICT) equipment ........................ 17 Annex A (informative): Power supply considerations ......................................................................... 18 Annex B (normative): Identification of interface A3 ........................................................................ 19 Annex C (informative): Calculation of the extreme DC voltage range at interface A3 ................... 20 Annex D (informative): Guide for defining inrush current energy, measuring inrush current and test generator peak inrush current drive capability............................ 21 D.1 Measurement .......................................................................................................................................... 21 D.2 Test generator peak inrush current drive capability ............................................................................... 21 D.3 Example of inrush current waveform ..................................................................................................... 22 Annex E (informative): Dimensioning of over-current protective devices ........................................ 23 SIST EN 300 132-3-1 V2.1.1:2012

ETSI ETSI EN 300 132-3-1 V2.1.1 (2012-02)4 Annex F (informative): Test generator for voltage dips, short interruptions and voltage variations ........................................................................................................ 24 Annex G (informative): Details of the voltage transient measurement in the most common case of distribution and protective devices .................................................. 25 Annex H (informative): Diagram of voltage ranges and values at the interface A3 ......................... 27 History .............................................................................................................................................................. 28

SIST EN 300 132-3-1 V2.1.1:2012

ETSI ETSI EN 300 132-3-1 V2.1.1 (2012-02)5 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http://ipr.etsi.org). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This European Standard (EN) has been produced by ETSI Technical Committee Environmental Engineering (EE). The present document concerns the requirements for the interface between telecommunication or datacommunication equipment (so called telecommunications and datacom (ICT) equipment) and its power supply. It includes requirements relating to its stability and measurement. Various other references and detailed measurement and test arrangements are contained in informative annexes. The introduced interface operated by DC source up to 400 V is considering power consumption increase and equipment power density increase in order to get higher energy efficiency with less material than with low voltage -48 VDC or permanent AC powering solution. The DC interface could also simplify the use of renewable energy with DC output such as photovoltaic generator. The present document is part 3-1 of a multi-part deliverable covering Environmental Engineering (EE); Power supply interface at the input to telecommunication and datacom (ICT) equipment, as identified below: Part 1: "Operated by alternating current (ac) derived from direct current (dc) sources"; Part 2: "Operated by -48 V direct current (dc)"; Part 3-0: "Operated by rectified current source, alternating current source or direct current source up to 400 V, Sub-part 0: Overview"; Part 3-1: "Operated by rectified current source, alternating current source or direct current source up to 400 V; Sub-part 1: Direct current source up to 400 V"; Part 3-2: "Operated by rectified current source, alternating current source or direct current source up to 400 V; Sub-part 2: Alternating up to 400 V solution"; Part 3-3: "Operated by rectified current source, alternating current source or direct current source up to 400 V; Sub-part 3: Rectified current up to 400 V solution". The parts 3-0 to 3-3 are the result of a revision of EN 300 132-3 [3]. This revision was necessary, because the present document was not clear. Sub-parts have been introduced for voltage interfaces A3 up to 400 V.

National transposition dates Date of adoption of this EN: 9 February 2012 Date of latest announcement of this EN (doa): 31 May 2012 Date of latest publication of new National Standard or endorsement of this EN (dop/e):

30 November 2012 Date of withdrawal of any conflicting National Standard (dow): 30 November 2012

SIST EN 300 132-3-1 V2.1.1:2012

ETSI ETSI EN 300 132-3-1 V2.1.1 (2012-02)6 1 Scope The present document contains requirements for: • the output performance of the power equipment at the interface A3; • the input of the telecommunications and datacom (ICT) equipment connected to interface A3. The voltage at interface A3 defined in the present document is DC voltage between 260 V and 400 V. The DC power can be supplied by the battery backup of a DC power system. The present document aims at providing compatibility between the power supply equipment and both the telecommunications and datacom (ICT) equipment, and the different load units connected to the same interface A3 (e.g. control/monitoring, cooling system, etc.). The purpose of the present document is: • to identify a power supply system with the same characteristics for all telecommunications and datacom (ICT) equipment defined in the area of application; the area of application may be any location where the interface A3 is used i.e. telecommunication centers, Radio Base Stations, datacenters and customer premises; • to facilitate interworking of different (types of) loads; • to facilitate the standardization of power supply systems for telecommunications and datacom (ICT) equipment; • to facilitate the installation, operation and maintenance in the same network of telecommunications and datacom (ICT) equipment and systems from different origins. General requirements for safety and EMC are out of the scope of the present document series unless specific requirement not defined in existing safety or EMC standards. 2 References References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the reference document (including any amendments) applies. Referenced documents which are not found to be publicly available in the expected location might be found at http://docbox.etsi.org/Reference. NOTE: While any hyperlinks included in the present clause were valid at the time of publication, ETSI cannot guarantee their long term validity. 2.1 Normative references The following referenced documents are necessary for the application of the present document. [1] IEC/EN 60947-2: "Low-voltage switchgear and controlgear - Part 2: Circuit-breakers". [2] IEC/EN 60269-1: "Low-voltage fuses - Part 1: General requirements". [3] IEC/EN 61000-4-5: "Electromagnetic compatibility (EMC) - Part 4-5: Testing and measurement techniques - Surge immunity test". [4] IEC/EN 61000-4-29: "Electromagnetic compatibility (EMC) - Part 4-29: Testing and measurement techniques - Voltage dips, short interruptions and voltage variations on d.c. input power port immunity tests". SIST EN 300 132-3-1 V2.1.1:2012

ETSI ETSI EN 300 132-3-1 V2.1.1 (2012-02)7 [5] IEC/EN 60898-2: "Circuit-breakers for overcurrent protection for household and similar installations - Part 2: Circuit-breakers for a.c. and d.c. operation". 2.2 Informative references The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area. [i.1] ETSI ETS 300 132-1: "Equipment Engineering (EE); Power supply interface at the input to telecommunications equipment; Part 1: Operated by alternating current (ac) derived from direct current (dc) sources". [i.2] ETSI EN 300 132-2: "Environmental Engineering (EE); Power supply interface at the input to telecommunications and datacom (ICT) equipment; Part 2: Operated by -48 V direct current (DC)". [i.3] IEC 60050-601: "International Electrotechnical Vocabulary. Chapter 601: Generation, transmission and distribution of electricity - General". [i.4] ETSI EN 300 253: "Environmental Engineering (EE); Earthing and bonding of telecommunication equipment in telecommunication centres". [i.5] ETSI EN 300 386: "Electromagnetic compatibility and Radio spectrum Matters (ERM); Telecommunication network equipment; ElectroMagnetic Compatibility (EMC) requirements". [i.6] IEC/EN 60950-1: "Information technology equipment - Safety - Part 1: General requirements". [i.7] CENELEC EN 62368-1 Ed. 1.0: "Audio/Video, Information and Communication Technology Equipment - Part 1: Safety requirements". [i.8] IEC/EN 60445: "Basic and safety principle for man-machine interface, marking and identification-Identification of equipment terminals, conductor terminations, and conductors". 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: abnormal service voltage ranges: steady-state voltage ranges over which the telecommunications and datacom (ICT) equipment will not be expected to maintain normal service but will survive undamaged area of application: any location where the interface A3 is used i.e. telecommunication centers, Radio Base Stations, datacenters andcustomer premises compliance criteria:

Criteria a): The apparatus shall continue to operate as intended during and after the test. No degradation of performance or loss of function is allowed below a performance level specified by the manufacturer, when the apparatus is used as intended. Criteria b): Temporary loss of function or degradation of performance, which ceases after the disturbance ceases, and from which the equipment under test recovers its normal performance, without operator intervention. NOTE: In the present document, the apparatus is the telecommunications and datacom (ICT) equipment. customer premises: any location which is the sole responsibility of the customer interface A3: interface, physical point, at which power supply is connected in order to operate the telecommunications and datacom (ICT) equipment SIST EN 300 132-3-1 V2.1.1:2012

ETSI ETSI EN 300 132-3-1 V2.1.1 (2012-02)8 load unit: power consuming equipment, that is part of a system block nominal voltage: value of the voltage by which the electrical installation or part of the electrical installation is designated and identified normal operating condition: typical environmental and powering conditions for operation of telecommunications and datacom (ICT) equipment, power supply, power distribution and battery normal operating voltage: typical value of the voltage at A3 interface within the normal operating voltage range normal operating voltage range: the voltage range at A3 interface where the system operates most of the time, e.g. in general linked to battery floating voltage normal service: service mode where telecommunications and datacom (ICT) equipment operates within its specification normal service voltage range: range of the steady-state voltage at the A3 interface over which the equipment will maintain normal service operating voltage: value of the voltage under normal conditions, at a given instant and a given point (A3 interface) of the system power supply: power supply to which telecommunications and datacom (ICT) equipment is intended to be connected

reference test voltage: voltage used as a reference to define the test voltage in the present document. The test voltage may be also a percentage of this voltage system block: functional group of telecommunications and datacom (ICT) equipment depending for its operation and performance on its connection to the same power supply telecommunications and datacom (ICT) equipment: in this context, telecommunications and datacom (ICT) equipment means telecommunication or datacommunication equipment that is a part of ICT equipment definition telecommunication centre: any location where telecommunications and datacom (ICT) equipment is installed and is the sole responsibility of the operator 3.2 Symbols For the purposes of the present document, the following symbols apply: Im maximum steady state current drain at 260 VDC at interface A3 Imss maximum steady state current drain in the abnormal service voltage range at interface A3 In current rating of the over-current protective device Ip peak inrush current at interface A3 IUT maximum steady state current drain at UT at interface A3 T50 time duration of the inrush current pulse at 50 % of Ip 3.3 Abbreviations For the purposes of the present document, the following abbreviations apply: AC Alternating Current NOTE: Also when used as a suffix to units of measurement. CB Circuit Breaker DC Direct Current NOTE: Also when used as a suffix to units of measurement. EMC ElectroMagnetic Compatibility EUT Equipment Under Test HOD High-Ohmic Distribution ICT Information and Communication Technology SIST EN 300 132-3-1 V2.1.1:2012

ETSI ETSI EN 300 132-3-1 V2.1.1 (2012-02)9 LOD Low-Ohmic Distribution MTTR Mean Time To Repair N Neutral conductor PE Protective Earth UT Reference Test Voltage VAC Volts Alternating Current VDC Volts Direct Current VRLA Valve Regulated Lead Acid 4 Interface A3 The power supply interface, interface A3 of figure 1, is a physical point to which all the requirements are related. This point is situated between the power supply system(s) and the power consuming telecommunications and datacom (ICT) equipment. An examples of configurations in which interface A3 is identified are given in annex B. Interface A3 is located at the power terminals of the telecommunications and datacom (ICT) equipment or system as defined by the manufacturer in accordance to IEC 60445 [i.8]. NOTE: Subject to the installation preconditions, this point may be located at any other point between the power supply system and the telecommunications and datacom (ICT) equipment by mutual agreement of the relevant parties.

telecom/datacom (ICT) equipment Power
supply
(+)
(-)
system block
(+) Positive DC terminal. (-) Negative DC terminal. PE Protective Earth.

Figure 1: General identification of the interface A3 5 DC interface requirements The definition of the DC interface voltages ranges and typical operating voltage values are illustrated in annex H. 5.1 Nominal voltage The nominal voltage is a normative definition used to enable differentiating power interfaces as defined in IEC 60050-601 [i.3]. The selected battery in general determines this nominal voltage, the operating voltage and the normal service voltage range in the system. SIST EN 300 132-3-1 V2.1.1:2012

ETSI ETSI EN 300 132-3-1 V2.1.1 (2012-02)10 NOTE 1: For example, 336 V is a nominal voltage defined with 168 lead-acid battery cells multiplied by the nominal cell voltage 2 V. This nominal DC voltage is equivalent to 48 V multiplied by 7. It allows the use of existing 48 V battery rack (e.g. Lithium battery racks). There may be other nominal voltage defined with different number of cells e.g. 156 lead-acid battery cells that lead to 312 V nominal voltage. Other battery technologies are possible in the future and will influence nominal voltage as well. For detailed calculation, refer to the annex C. NOTE 2: Sometimes, the nominal voltage is not linked to the nominal battery voltage e.g. in architectures that include a boost converter in the battery string. 5.2 Normal service voltage range at interface A3 The normal service voltage range at powering interface A3 of telecommunications and datacom (ICT) equipment shall be as follows: • minimum voltage: 260 VDC; • maximum voltage: 400 VDC. NOTE 1: The voltage at the output of the power supply must take into account the voltage drop in the cable at maximum steady current Im and/or the maximum battery charge to stay in the normal service voltage range at the interface A3 as explained in annexes A, B and C. NOTE 2: For examples on how to calculate normal service voltage range, refer to annex C. 5.3 Normal operating voltage range at interface A3 The normal operating voltage range at interface A3 is defined by the voltage levels where the system will operate most of the time under normal operating conditions; this range shall be within the normal service voltage range. The normal operating voltage is a typical voltage inside the normal operating voltage range. NOTE 1: Examples of normal operating voltages are 354 V and 380 V.

354 V corresponds to 156 VRLA cells in floating mode (351 V to 359 V with 2.25 V to 2.30 V per cell) and with no voltage drop in the power distribution.

380 V corresponds to 168 VRLA cells in floating mode (378 V to 386 V with 2.25 V to 2.30 V per cell) and with no voltage drop in the power distribution. NOTE 2: For examples on how to calculate normal operating voltage range, refer to annex C. 5.4 Reference test voltage (UT) at interface A3 The reference test voltage ( UT) for telecommunications and datacom (ICT) equipment is defined at:

UT = 365 V +/- 15 V NOTE: The powering solution should work in any site even with very long power cables i.e. UT at the input of telecommunications and datacom (ICT) equipment is lower than power supply output. For constant power telecommunications and datacom (ICT) equipment, the current is increasing as a function of decreasing voltage. 5.5 Abnormal service voltage ranges at interface A3 The telecommunications and datacom (ICT) equipment may be subjected to steady state voltage out of the normal service voltage range. Limits of abnormal service voltage range are defined as follows: • 0 V < U < 260 V • 400 V < U < 410 V SIST EN 300 132-3-1 V2.1.1:2012

ETSI ETSI EN 300 132-3-1 V2.1.1 (2012-02)11 For example, it may be undervoltage and overvoltage at battery end of discharge or end of charge and rectifier regulation failures. NOTE 1: From design point of view, that means that there is an hardware voltage limitation inside the rectifier in case the software fails, and MTTR is long. After the restoration of the supply from the abnormal service voltage range to the normal service voltage range, the telecommunications and datacom (ICT) equipment shall fulfil the following performance criteria: • the telecommunications and datacom (ICT) equipment shall not suffer any damage; • the telecommunications and datacom (ICT) equipment shall be able to automatically resume operation according to its specifications when the voltage comes back into the normal service voltage range. NOTE 2: The second criterion implies that abnormal service voltage should not lead to the disconnection of power supply units e.g. by causing circuit breakers, fuses or other such devices to operate. 6 Abnormal conditions: Voltage variations, voltage dips, short interruptions and voltage surges at interface A3 Under abnormal conditions, voltage values outside the normal service voltage range may occur for short time.

The deviations from the steady-state voltage at the A3 interface may be caused by:

• Voltage variations. • Voltage dips. • Voltage interruptions. • Voltage surges. The tests for voltage dips, short interruption and voltage variations shall be conducted in accordance with standard EN 61000-4-29 [4]. The tests for voltage surges shall be conducted in accordance with standard EN 61000-4-5 [3]. Specific criteria to telecommunications and datacom (ICT) equipment are defined in each test table below. The detailed specification of the generator is in annex F. The tests shall be performed on individual modules/subsystems. 6.1 Voltage variations

Voltage Duration Compliance Criteria on telecommunications and datacom (ICT) equipment Comments From UT to 260 V, back to UT 1 min Criteria a)

Normal performance Test of minimum operating voltage at A3 within the normal service voltage range

From UT to 400 V, back to UT 1 min Criteria a)

Normal performance Test of maximum operating voltage at A3 within the Normal Service Voltage Range From UT to 410 V, back to UT 1 s Criteria b)

Temporary loss of function or degradation of performance, automatic recovery to normal performance after the test Test of voltage rise variation entering abnormal service voltage range From UT to 420 V, back to UT 10 ms Criteria b) Temporary loss of function or degradation of performance, automatic recovery to normal performance after the test

Test of voltage rise variation outside abnormal service voltage range
SIST EN 300 132-3-1 V2.1.1:2012
ETSI ETSI EN 300 132-3-1 V2.1.1 (2012-02)12 6.2 Voltages dips

Voltage Duration Compliance Criteria on telecommunications and datacom (ICT) equipment Comments From UT to 260 V, back to UT 10 ms Criteria a) Normal performance Test of minimum operating voltage at A3 within the Normal Service Voltage Range

6.3 Short interruptions

Voltage Supply Network Duration Compliance Criteria on telecommunications and datacom (ICT) equipment Comments UT to 0 V back to UT Low Impedance (short circuit) 10 ms Criteria a) Normal performance Test of holdup time during fault clearing due to a short-circuit in the system UT to 0 V back to UT High Impedance (open circuit) 1

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