I EC
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`IEC 60950-1
`
`Edition 2.2 2013-05
`
`INTERNATIONAL
`
`STANDARD
`
`NORME
`
`_ INTERNATIONALE
`
`colour
`InSIde
`
`
`
`Information technology equipment - Safety —
`Part 1: General requlrements
`
`Matériels de traitement de l'information — Sécurité —-
`
`Partie 1: Exigences générales
`
`IEC50950-1:2005+A1:2012+A2:2013
`
`Page 1 of 648
`
`VOLTSERVER EXHIBIT 1023 (part 1 of 11)
`
`

`

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`Page 2 of 648
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`

`

`
`
`IEC 60950-1
`
`Edition i2 20i3—o5
`
`INTERNATIONAL
`
`STANDARD
`
`NORME
`
`INTERNATIONALE
`
`Information technology equipment —- Safety -
`Part 1: General requirements
`
`Matériels de traitement de l'information — Sécurité —
`
`Partie 1: Exigences générales
`
`colour
`ll’lSICIe
`
`INTERNATIONAL
`ELECTROTECHNICAL
`COMMISSION
`
`COMMISSION
`ELECTROTECHNIQUE
`INTERNATIONALE
`
`
`ICS 35.020; 35250
`ISBN 978-2—8322—0820—5
`
`Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
`
`Page 3 of 648
`
`

`

`— 2 —
`
`50950—1 © |EC22005+A122009
`+A2:2013
`
`CONTENTS
`
`FOREWORD .......................................................................................................... 8
`
`lNTRODUCTlON ................................................................................................................... 10
`
`0
`
`Principles of safety ......................................................................................................... 10
`0.1 General principles of safety ......................................................
`
`0.2 Hazards ................................................................................................................ 11
`
`0.3 Materials and components ..................................................................................... 14
`1 General .......................................................................................................................... 15
`
`Scope .................................................................................................................... 15
`1.1
`1.2 Definitions ............................................................................................................. 17
`
`1.3 General requirements ............................................................................................ 32
`1.4 General conditions for tests ................................................................................... 33
`
`1.5 Components .......................................................................................................... 38
`1.6
`Power interface ..................................................................................................... 46
`
`1.7 Markings and instructions ...................................................................................... 46
`Protection from hazards ................................................................................................. 55
`
`2
`
`2.1
`2.2
`
`2.3
`
`2.4
`
`2.5
`
`2.6
`
`Protection from electric shock and energy hazards ................................................ 55
`SELV circuits ..................... .
`
`TNV circuits ........................................................................................................... 67
`
`Limited current circuits .......................................................................................... 72
`
`Limited power sources ........................................................................................... 73
`
`Provisions for earthing and bonding ...................................................................... 74
`
`2.7 Overcurrent and earth fault protection in primary circuits ....................................... 82
`2.8
`Safety interlocks .................................................................................................... 87
`2.9
`Electrical insulation ............................................................................................... 88
`
`2.10 Clearances. creepage distances and distances through insulation ......................... 94
`3 Wiring, connections and supply .................................................................................... 123
`3.1 General ............................................................................................................... 123
`
`3.2 Connection to a mains supply .............................................................................. 126
`
`3.3 Wiring terminals for connection of external conductors ........................................ 133
`
`3.4 Disconnection from the mains supply .................................................................. 136
`
`interconnection of equipment .............................................................................. 139
`3.5
`Physical requirements .................................................................................................. 140
`
`4
`
`Stability ...........................................
`4.1
`
`4.2 Mechanical strength ............................................................................................ 141
`
`4.3 Design and construction ...................................................................................... 145
`4.4
`Protection against hazardous moving parts ......................................................... 154
`4.5 Thermal requirements ......................................................................................... 156
`
`4.6 Openings in enclosures ....................................................................................... 160
`4.7 Resistance to fire ................................................................................................ 166
`
`5
`
`Electrical requirements and simulated abnormal conditions .......................................... 173
`
`5.1
`
`Touch current and protective conductor current ................................................... 173
`
`5.2 Electric strength .................................................................................................. 181
`
`Page 4 of 648
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`

`

`60950—1 © |EC:2005+A132009
`+A2:2013
`
`— 3 —
`
`6
`
`Connection to telecommunication networks .................................................................. 189
`
`6.1
`
`Protection of telecommunication network service persons, and users of other
`equipment connected to the network, from hazards in the equipment .................. 189
`62 Protection of equipment users from overvoltages on telecommunication
`networks ............................................................................................................. 191
`
`7
`
`Protection of the telecommunication wiring system from overheating ................... 194
`6.3
`Connection to cable distribution systems ...................................................................... 194
`7.1 General ............................................................................................................... 194
`
`7.2
`
`Protection of cable distribution system service persons. and users of other
`equipment connected to the system, from hazardous voltages in the
`equipment ........................................................................................................... 195
`
`7.3
`
`Protection of equipment users from overvoltages on the cable distribution
`system ................................................................................................................ 195
`
`7.4
`
`insulation between primary circuits and cable distribution systems ...................... 195
`
`Annex A (normative) Tests for resistance to heat and fire .................................................. 198
`Annex B (normative) Motor tests under abnormal conditions .............................................. 201
`Annex C (normative) Transformers .................................................................................... 207
`
`Annex D (normative) Measuring instruments for touch current tests ................................... 210
`
`Annex E (normative) Temperature rise of a winding ........................................................... 212
`
`Annex F (normative) Measurement of clearances and creepage distances ......................... 213
`Annex G (normative) Alternative method for determining minimum clearances ................... 221
`Annex H (normative)
`Ionizing radiation .............................................................................. 229
`
`Annex J (normative) Table of electrochemical potentials (see 2.6.5.6) ............................... 230
`Annex K (normative) Thermal controls ............................................................................... 232
`
`Annex L (normative) Normal load conditions for some types of electrical business
`equipment ........................................................................................................................... 234
`
`Annex M (normative) Criteria for telephone ringing signals ................................................ 236
`Annex N (normative)
`Impulse test generators .................................................................... 241
`Annex P (normative) Normative references ........................................................................ 243
`
`Annex Q (normative) Voltage dependent resistors (VDRs) ................................................. 248
`
`Annex R (informative) Examples of requirements for quality control programmes ............... 25D
`Annex 8 (informative) Procedure for impulse testing .......................................................... 253
`
`Annex T (informative) Guidance on protection against ingress of water ............................. 255
`Annex U (normative) Insulated winding wires for use without interleaved insutation ............ 257
`
`Annex V (normative) AC power distribution systems ........................................................... 263
`Annex W (informative) Summation of touch currents ........................................................... 270
`Annex X (informative) Maximum heating effect in transformer tests ................................... 273
`
`Annex Y (normative) Ultraviolet light conditioning test ........................................................ 275
`
`Annex Z (informative) Overvoltage categories (see 2.10.3.2 and Clause G2) ........................ 276
`
`Annex AA (normative) Mandrel test (see 2.10.5.8) ............................................................... 277
`Annex BB (informative) Changes in the second edition ...................................................... 280
`
`Annex CC (normative) Evaluation of integrated circuit (IC) current limiters ........................ 283
`Annex DD (normative) Requirements for the mounting means of rack-mounted
`equipment ........................................................................................................................... 286
`
`Annex EE (normative) Household and home/office documentlmedia shredders .................. 288
`
`Page 5 of 648
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`

`

`—4—
`
`60950-1©|EC:2005+A1:2009
`+A2:2013
`
`Bibliography ........................................................................................................................ 292
`Index ................................................................................................................................ 294
`
`Figure 2A — Test finger .............................................................................................. 58
`
`Figure 2B — Test pin ............................................................................................................. 59
`
`Figure 20 — Test probe ......................................................................................................... 59
`
`Figure ZD - Accessibility of internal conductive parts ............................................................ 60
`
`Figure 2E — Voltages in SELV circuits under singie fault conditions ...................................... 66
`
`Figure 2E.1 — Voltages in SELV circuits under single fault conditions for a single pulse
`above V1 .............................................................................................................................. 65
`
`Figure 2E.2 — Voltages in SELV circuits under single fault conditions for multiple
`pulses above V1 ................................................................................................................... 66
`
`Figure 2F — Maximum voltages permitted after a single fault ................................................. 68
`
`Figure 2G — Test generator ................................................................
`
`
`Figure 2H — Examples of application of insulation ................................................................. 93
`
`Figure 2J — Thermal ageing time ......................................................................................... 120
`
`Figure 2K ~ Abrasion resistance test for coating layers ....................................................... 121
`
`Figure 4A h Impact test using a steel ball ............................................................................ 143
`
`Figure 4B — Examples of cross-sections of designs of openings preventing vertical
`access ................................................................................................................................ 160
`
`Figure 4C — Examples of louvre design .......................................................
`
`Figure 4D — Enclosure openings ......................................................................................... 162
`
`Figure 4E — Typical bottom of a fire enclosure for partially enclosed component or
`assembly ............................................................................................................................ 163
`
`Figure 4F — Baffle plate construction ................................................................................... 163
`
`Figure 5A — Test circuit for touch current of single—phase equipment on a star TN or TT
`power supply system .......................................................................................................... 175
`
`Figure SB — Test circuit for touch current of three-phase equipment on a star TN or TT
`power supply system .......................................................................................................... 175
`
`Figure 6A — Test for separation between a telecommunication network and earth ............... 191
`
`Figure SB — Application points of test voltage ..................................................................... 192
`
`Figure 31 — Determination of arithmetic average temperature ............................................ 202
`
`Figure 0.1 — Determination of arithmetic average temperature ...................................
`
`...208
`
`Figure 13.1 — Measuring instrument ..................................................................................... 210
`
`Figure D.2 —~ Alternative measuring instrument .................................................................... 211
`
`Figure F.1 — Narrow groove ................................................................................................ 213
`
`Figure F2 — Wide groove .................................................................................................... 213
`
`Figure F.3 — V~shaped groove ............................................................................................. 214
`
`Figure F.4 — Rib .................................................................................................................. 214
`
`Figure F.5 — Uncemented joint with narrow groove .............................................................. 214
`
`Figure F.6 — Uncemented joint with wide groove ................................................................. 215
`
`Figure F7 — Uncemented joint with narrow and wide grooves ............................................. 215
`Figure F.8 — Narrow recess ................................................................................................. 216
`
`Figure F9 — Wide recess .................................................................................................... 217
`
`Page 6 of 648
`
`

`

`60950-1 © iEC:2005+A1:2009
`+A2:2013
`
`— 5 —
`
`Figure F.11 — Coating over printed wiring ........................................................................... 218
`
`Figure F.12 2 Measurements through openings in enclosures ............................................. 216
`
`Figure F.13 — intervening. unconnected conductive part ..................................................... 219
`
`Figure F.14 — Solid insulating material ................................................................................ 219
`
`Figure F.15 — Thin sheet insulating material ........................................................................ 219
`
`Figure F.16 — Cemented joints in muiti-layer printed board ................................................. 220
`
`Figure F.17 — Component filled with insulating compound ................................................... 220
`
`Figure F.18 — Partitioned bobbin ......................................................................................... 220
`
`Figure M1 w Definition of ringing period and cadence cycle ................................................ 237
`
`Figure M.2 — ITS1 limit curve for cadenced ringing signal ................................................... 238
`
`Figure M.3 — Peak and peak-to-peak currents ..................................................................... 239
`
`Figure M.4 — Ringing voltage trip criteria ............................................................................. 240
`
`Figure N.1 — lTU-T impulse test generator circuit ................................................................ 241
`
`Figure N.2 — IEC 60065 impulse test generator circuit ........................................................ 242
`
`Figure 8.1 — Waveform on insulation without surge suppressors and no breakdown ........... 253
`
`Figure 8.2 — Waveforms on insulation during breakdown without surge suppressors ........... 254
`
`Figure 8.3 — Waveforms on insulation with surge suppressors in operation ......................... 254
`
`Figure 8.4 - Waveform on short-circuited surge suppressor and insulation ......................... 254
`
`Figure V.1 — Examples of TN-S power distribution systems ................................................. 265
`
`Figure v.2 - Example of TN-C-S power distribution system ................................................ 266
`
`Figure v.3 — Example of TN-C power distribution system .................................................... 266
`
`Figure v.4 — Example of single—phase, three~wire TN~C power distribution system .............. 267
`
`Figure V.5 — Example of three fine and neutral TT power distribution system ...................... 267
`
`Figure V.6 — Example of three line TT power distribution system ........................................ 268
`
`Figure v.7 — Example of three line (and neutral) IT power distribution system ..................... 268
`
`Figure v.8 — Example of three line lT power distribution system ......................................... 269
`
`Figure W.1 — Touch current from a floating circuit ............................................................... 270
`
`Figure W.2 a Touch current from an earthed circuit ............................................................. 271
`
`Figure WAS — Summation of touch currents in a PABX _________________________________________________________ 271
`
`Figure AA.1 — Mandrel ........................................................................................................ 277
`
`Figure AA.2 — initial position of mandrel .............................................................................. 278
`
`Figure AA.3 — Final position of mandrel .............................................................................. 278
`
`Figure AAA — Position of metal foil on insulating material ................................................... 278
`
`Figure EE.1 — Wedge probe (overall view) .......................................................................... 290
`
`Figure EE.2 — Wedge probe (tip detail) ............................................................................... 291
`
`Table 1A — Voltage ranges of SELV and TNV circuits ........................................................... 25
`
`Table 18 — Equivalence of flammability classes .................................................................... 26
`
`Table 10 — Capacitor ratings according to lEC 60384-14 ........................................
`
`
`Table 1D — Informative examples of application of capacitors ............................................... 41
`
`Table 2A — Distance through insulation of internal wiring ...................................................... 61
`
`Table 2B — Limits for power sources without an overcurrent protective device ..................... 74
`
`Page 7 of 648
`
`

`

`— 6 —
`
`60950-1 ©1EC:2005+A1:2009
`+A2:2013
`
`Table 2D — Minimum size of protective bonding conductors .................................................. 77
`
`Table 2E — Test duration, a.c. mains supplies ....................................................................... 79
`
`Table 2F — Informative examples of protective devices in single-phase equipment or
`subassemblies ...................................................................................................................... 84
`
`Table ZG — Informative examples of protective devices in three—phase equipment ................ 84
`
`Table 2H — Examples of application of insulation .................................................................. 90
`
`Table 2J — AC mains transient voitages ................................................................................ 98
`
`Table 2K — Minimum clearances for insulation in primary circuits and between primary
`and secondary circuits ........................................................................................................ 100
`
`Table 2L — Additional clearances in primary circuits ........................................................... 100
`
`Table 2M - Minirnum clearances in secondary circuits ........................................................ 102
`
`Table 2N — Minimum creepage distances ............................................................................ 107
`
`Table 2P — Tests for insulation in non-separable layers ...................................................... 112
`
`Table 20 — Minimum separation distances for coated printed boards .................................. 116
`
`Table 2R — Insulation in printed boards ............................................................................... 118
`
`Table 3A — Sizes of cables and conduits for equipment having a rated current not
`exceeding 16 A ................................................................................................................... 128
`Table 3B — Sizes of conductors ........................................................................................... 130
`
`Table SC — Physical tests on power supply cords ................................................................ 131
`
`Table 3D — Range of conductor sizes to be accepted by terminals ...................................... 134
`
`Table 3E — Sizes of terminals for mains supply conductors and protective earthing
`conductors ......................................................................................................................... 134
`
`Table 4A — Minimum property retention limits after UV exposure ......................................... 151
`
`Table 4B — Temperature limits, materials and components ................................................. 157
`
`Table 40 — Touch temperature limits .................................................................................. 159
`
`Table 4D — Size and spacing of openings in metal bottoms of fire enclosures .................... 163
`
`Table 4E — Summary of material flammability requirements ............................................... 172
`Table 5A u Maximum current .............................................................................................. 177
`
`Table SB — Test voltages for electric strength tests based on peak working voltages Part 1 .. 183
`
`Table SB — Test voltages for electric strength tests based on peak working voltages Part 2 .. 184
`
`Table SC — Test voltages for electric strength tests based on required withstand voltages .185
`Table 5D — Temperature limits for overload conditions ........................................................ 188
`
`Table 8.1 — Temperature limits for motor windings (except for running overload test) ......... 202
`
`Table B2 — Permitted temperature limits for running overload tests .................................... 203
`
`Table 01 — Temperature limits for transformer windings .................................................... 208
`Table F.1~ Value of X ........................................................................................................ 213
`
`Table G.1 — AC mains transient voltages ............................................................................ 222
`
`Table 6.2 — Minimum clearances up to 2 000 m above sea level ........................................ 227
`
`Table J.1 — Electrochemical potentials (V) .......................................................................... 230
`
`Table N.1 w Component values for Figures N1 and N2 ...................................................... 242
`
`Table R1 — Rules for sampling and inspection — coated printed boards .............................. 251
`
`Table R.2 — Rules for sampling and inspection — reduced clearances ................................. 252
`Table T.1 — Extract from lEC 60529 .................................................................................... 256
`
`Page 8 of 648
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`

`

`60950—1 © |ECiZOO5+A112009
`+A2:20‘[3
`
`— 7 —
`
`Table U.2 — Oven temperature ............................................................................................ 261
`
`Table X.1 — Test steps ........................................................................................................ 273
`
`Table 2.1 — Overvoltage categories .................................................................................... 276
`
`Page 9 of 648
`
`

`

`— 8 —
`
`60950-1 © |EC:2005+A1:2009
`+A2i2013
`
`INTERNATIONAL ELECTROTECHNICAL COMMISSION
`
`INFORMATION TECHNOLOGY EQUIPMENT —
`SAFETY —
`
`Part1: General requirements
`
`FOREWORD
`
`1i
`
`2)
`
`3)
`
`5)
`7)
`
`I3i
`
`9)
`
`The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
`all national electrotechnical committees
`(IEC National Committees). The object of
`IEC is
`to promote
`international co-operation on all questions concerning standardization in the electrical and electronic fields. To
`this end and in addition to other activities,
`IEC publishes International Standards, Technical Specifications,
`Technical Reports, Publicly Available Specifications
`(PAS) and Guides
`(hereafter
`referred to as “IEC
`Publicationtsl“). Their preparation is entrusted to technical committees; any IEC National Committee interested
`in the subject dealt with may participate in this preparatory work.
`International, governmental and non-
`governmental organizations liaising with the IEC also participate in this preparation.
`IEC collaborates closely
`with the International Organization for Standardization (ISO)
`in accordance with conditions determined by
`agreement between the two organizations,
`The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
`consensus of opinion on the relevant subjects since each technical committee has representation from all
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`IEC Publications have the form of recommendations for international use and are accepted by IEC National
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`lEC National Committees undertake to apply lEC Publications
`In order to promote international uniformity,
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`IEC Itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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`All