`
`IEC 60947-1
`
`Edition 5.0 2014—09
`
`INTERNATIONAL
`
`STANDARD
`
`NORME
`
`INTERNATIONALE §® WI
`Low—voltageswitchgearandco‘
`- Q
`
`AMENDMENT 2
`AMENDEMENT 2
`
`
`
`Part 1: General rules
`
`IEC60947—1:2DO7—DGIAMDZ:2.D14-DQ(en-fr)
`
`Page 1 of 106
`
`VOLTSERVER EXHIBIT 1024 (part 1 of 2)
`
`

`

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`Page 2 of 106
`
`

`

`
`
`IEC 60947-1
`
`4 [5611166310 2014-09
`
`INTERNATIONAL
`
`STANDARD
`
`NORME
`
`INTERNATIONALE
`
`colour
`InSIde
`
`AMENDMENT 2
`AMENDEMENT 2
`
`
`ae Q
`
`Low-voltageswitchgearandco
` Partie 1: Régles g' é e
`
`Part 1: General rules
`
`O
`
`INTERNATIONAL
`ELECTROTE C H NICAL
`COMMISSION
`
`COMMISSION
`ELECTROTECHNIQUE
`
`NTERNATIONALE
`
`ICS 29.13020
`
`PRICE CODE
`CODE PRIX XA
`
`ISBN 973-2—8322—1798—6
`
`
`
`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 106
`
`

`

`— 2 —
`
`IEC 60947-1:20071AMD2:2014
`© [EC 2014
`
`FOREWORD
`
`This amendment has been prepared by subcommittee 17B: Low—voltage switchgear and
`controlgear, of IEC technical committee 17: Switchgear and controlgear.
`
`The text of this amendment is based on the following documents:
`
`121AI15lFDIS
`
`iZiA/ZilRVD
`
`
`Full information on the voting forr the approval of this amendment can br- fou a
`on voting indicated in the above table.
`
`
`in the report
`
`The committee has decided that the contents of this amendment an
`remain unchanged until
`the
`stability date
`indicated 0
`-
`"http:/lwebstore.iec.ch" in the data related to the specif'c u
`
`publication will be
`
`reconfirm ed,
`withdrawn,
`
`replaced by a revised edition, or
`amended.
`
`
`
`
`
`. 6 page of this publication indicates
`-d to be useful
`for
`the correct
`herefore print this document using a
`
`it contains colo
`that
`understanding of its
`
`:
`
`s
`
`‘
`
`-
`
`-
`
`,.
`
`‘
`
`colour printer.
`
`switchgear and con oigear hereinafter referred to as "equipment" or "device" and intended to
`be connected to circuits the rated voltage of which does not exceed 1000Va.c. or
`'1 500 V d.c.
`
`rules and common safety requirements for
`This standard states the general
`switchgear and controlgear, including:
`
`low—voltage
`
`—
`
`e
`
`—
`
`definitions;
`
`characteristics;
`
`information supplied with the equipment;
`
`— normal service, mounting and transport conditions;
`
`e constructional and performance requirements;
`
`— verification of characteristics and performance;
`
`_
`
`environmental aspects.
`
`Page 4 of 106
`
`

`

`lEC 60947-1i2007lAMD2i2014
`© IEC 2014
`
`— 3 —
`
`This standard does not apply to low-voltage switchgear and controigear assemblies which are
`dealt with in IEC 61439 series, as applicable.
`
`1 .2 Normative references
`
`Delete the existing reference to "IEC 60439-1z1999" and its Amendment 1.
`
`Replace the existing references by the following new references:
`
`lEC 60664-12007, insulation coordination for equipment within low-voltage systems — Part 1:
`Principles, requirements and tests
`
`{
`compatibility
`IEC 61000-4-4:2012, Electromagnetic
`measurement techniques e Electrical fast transient/
`rs '
`
`
`Limitation of
`IEC 61000-3-3z2013, Electromagnetic compatibility (EMC) — Pan‘ 3—3:
`voltage changes, voltage fluctuations and flicker in public lawn/cit.
`:
`stems, for
`
`
`(EMC)
`compatibility
`[EC 61000-422008, Electromagnetic
`‘:
`‘
`-sting and
`measurement techniques — Electrostatic discharge immunit
`
`
`-
`
`
`
`lEC 61000—4—6:2013, Electromagneti
`
`fields
`
`IEC 61000-4-8:2009, Eiectromagneti
`measurement techniques
`‘
`-
`
`
`lndu ‘
`CISPR11:2009,
`
`characteristics~ '
`it
`Amendment 1
`(
`
`IEC 60947—5
`
`
`
`harmonic current e '
`Amendment 1 (2008)
`Amendment 2 (2009)
`
`sions (equipment input current _< 16 A per phase)
`
`IEC 61000-4-3:2006, Electromagnetic
`measurement techniques — Radiateo‘,
`Amendment 1 (2007)
`Amendment 2 (2010)
`
`4-3: Testing and
`— Part
`compatibility (EMC)
`radio-frequency, electromagnetic field immunity test
`
`4—13: Testing and
`[EC 61000-4-13:2002, Electromagnetic compatibility (EMC) — Part
`measurement techniques H Harmonics arid interharmonics including mains signalling at 3.0.
`power port, low-frequency immunity tests
`Amendment 1 (2009)
`
`Add the following new normative references as follows:
`
`Page 5 of 106
`
`

`

`— 4 —
`
`IEC 60947-112007/AMD22014
`© IEC 2014
`
`lEC 60092-5042001, Electrical installations in ships 2 Part 504: Special features — Control
`and instrumentation
`
`IEC 60300—3-52001, Dependability management — Part 3-5: Application guide — Reliability
`test conditions and statistical test principles
`
`IEC 61508 (all parts), Functional safety of electrical/electronic/programmable electronic
`safety-related systems
`
`IEC 616492008, Weibull analysis
`
`ted electrical,
`iEC 620612005, Safety of machinery — Functional safety of safet
`
`electronic and programmable electronic control systems
`
`
`
`General principles for design
`
`
`
`
`
`in the alphabetical
`list,
`the " ~
`2 0 these terms, modified by
`
`2 Definitions
`
`Replace,
`
`
`
`Minimum cross~section .
`
`entry:
`
`
`Multiple tip contact syst
`
`Replace, in the. .
`ver—current discrimination" by the following new
`
`
`
` Over-current selec 'vit
`
`......................................................................... 2.5.23
`
`insulation coordin. ‘n o .rrier ............................
`
`Rated control circuit supply voltage .................................................................................. 2.5.67
`Rated control circuit voltage ............................................................................................. 2.5.66
`Rigid conductor ......................................................................................................
`.....2.3.31
`Solid conductor .....
`2.3.29
`
`Solid insulation ................................................................................................................ 2.1.22
`Stranded conductor .......................................................................................................... 2.3.30
`
`2.1 General terms
`
`Add, at the end of the existing subcla use, the following new terms and definitions:
`
`2.1.22
`solid insulation
`
`solid insulating material interposed between two conductive parts
`
`Page 6 of 106
`
`

`

`IEC 60947-1:2007/AMD2:2014
`© IEC 2014
`
`2.1.23
`insulation coordination barrier
`
`H 5 —
`
`solid insulating material that is not an integral part, provided for the purpose of increasing
`either creepage distances or clearance distances or both
`
`2.2 Switching devices
`
`Add, at the end of the existing subclause, the following new term and definition:
`
`2.2.23
`individual enclosure
`
`enclosure designed and dimensioned to contain one equipment only
`
`2.3 Parts of switching devices
`
`Add, after the existing definition 2.3.28 added by Amendment 1,
`definitions and renumber the existing definitions 2.3.2.9 to
`respectively:
`
`2.3.29
`solid conductor
`
`conductor consisting of a single wire
`
`[461-01-06, modified]
`
`2.3.30
`stranded conductor
`conductor consisting 0
`
`
`
`t
`
`
`
`
`
`NOTE 1 The solid conductor may be circular 7
`
`
`NOTE 2 Solid conductor is defined as class 1 c
`C 60344, or equivalent AWlecmiI.
`
`
`
`Ime of which are wound in a helix
`
`
`conductor
`
`NOTE Stranded c®l
`
`AWlecmil.
`
`in EEG 60228. or by EC 80344, or equivalent
`
`
`
`2.3.31
`
`conductor is
`
`
`
`-t suit- le or use in a flexible cable
`
`
`2.3.32
`flexible conductor
`
`stranded conductor having wires of diameters small enough and so assembled that
`conductor is suitable for use in a flexible cable
`
`the
`
`NOTE Flexible conductor is defined as class 5 or class 6 conductor in IEC 60228, or by EC 60344, or equivalent
`AWleomil.
`
`[4651-01-11, modified]
`
`2.5 Characteristic quantities
`2.5.23
`over—current discrimination
`
`Replace the existing term by the new following term:
`
`Page 7 of 106
`
`

`

`over-current selectivity
`
`— 6 —
`
`IEC 60947-1:2007/AMD2:2014
`© IEC 2014
`
`Replace, in the existing note of this definition, the word “discrimination” by "selectivity".
`
`Delete the existing source ”[441-17-151".
`
`Add, after the existing definition 2.5.65, the following new terms and definitions:
`
`2.5.66
`rated control circuit voltage
`UC
`rated voltage which is controlling the input signal of the control device
`
`2.5.67
`rated control circuit supply voltage
`Us
`rated voltage applied to energize the power supply terminals of
`
`\.
`
`irc
`
`4 Characteristics
`
`Add, in the existing table, the following newline:
`A
`
`._ -
`‘r
`
` A
`
`
`
`\ ‘mctensnc
`Rated control c
`o y v- tage
`
`4.3.6.1 Rated short-time withstand current (law)
`
`Replace the existing text of this subclause by the following new text:
`
`The rated short~time withstand current of an equipment is the value of short-time current,
`assigned to the equipment by the manufacturer,
`that
`the equipment can carry without
`damage, under the test conditions specified in the relevant product standard.
`
`4.3.6.4 Rated conditional short-circuit current
`
`Replace the existing title of this subclause by the following new title:
`
`4.3.6.4 Rated conditional short-circuit current (Iq)
`
`Page 8 of 106
`
`

`

`IEC 60947—122007/AMD212014
`© IEC 2014
`
`— 7 —
`
`4.3.7 Pole impedance of the switching device (2)
`
`The pole impedance may be stated by the manufacturer and is determined by measuring the
`voltage drop resulting from the current flowing through the pole.
`
`4.5.1 Electrically or electronically controlled circuits
`
`Replace the existing fourth dashed item, modified by Amendment 1, by the following new
`dash:
`
`—
`
`rated control circuit supply voltage U’S (ac, do), where applicable;
`
`NOTE1 Distinction is made between the rated control circuit voltage U6 and th ra d ‘
`voitage US which may be different from Uc due to the presence of built-in tra- ‘ mer
`electronic circuitry, etc.
`
`Delete the existing Note 2 added by Amendment 1.
`
`Replace the existing Note 1 added by Amendment 1 by the following new n -:
`
`
`
`Replace the existing paragraph after Note 2, added by
`4‘
`e following new
`'
`paragraph:
`
`
`ircuit supply
`resistors,
`
`'
`
`The correct operating conditions are based upo
`not less than 85 % of its rated valu
`w'
`‘
`flowing, nor more than 110 % of its ra
`
`
`
`
`5.1 Nature of information
`
`dash:
`
`—
`
`control circuit sup
`
`control coil;
`
`
`Add,
`
`in the existin
`
`two new dashedi '
`
`Replace the second sentence of the second paragraph by the following new sentence:
`
`For equipment only suitable in environment A (see 7.3.1), the manufacturer shall provide the
`following notice in documentation, availabie as information to potential customers and with the
`product for users:
`
`Add, after the existing Subclause 5.3, the following new subclause:
`
`5.4 Environmental information
`
`Material declarations according to AnnexW shall be provided if required by the relevant
`product standard.
`
`Page 9 of 106
`
`

`

`— 8 —
`
`[EC 60947—12007/AMD212014
`© IEC 2014
`
`6.1.1 Ambient air temperature
`
`Replace, in the existing Note 1 “IEC 60439—1” by ”IEC E51439 series“.
`
`7.1.2.2 Glow wire testing
`
`Replace, in the existing note, ”lEC 60695-2-2" by "EC 60695-11-5".
`
`Add, at the end of existing note, the following new sentence:
`
`The needle flame test is used as an alternative test for addressing flame retardancy requirements for shipboard
`applications.
`
`7.1.4 Clearances and creepage distances
`
`Replace the existing text of this subclause by the following new thre
`
`
`
`
`
`7.1.4.1 General
`
`For equipment tested according to 8.3.3.4 of this stanw .
`Table 13 and Table 15.
`
`
`
`-
`
`‘
`
`.
`
`as are given in
`
`
`Electrical requirements are given in 7.2.3.
`
`
`
`7.1.4.2 Insulation coor'
`
`
`
`
`
`creepage distan
`or the flammabili
`
`7.1.4.3
`
`Insulati
`
`When solid '
`an insulation coordination barrier to comply with required
`clearanc-
`'
`2 not physically support or maintain the relative position of
`
`
`in 7.1 2 .-u s ‘~e[[
`,-
`to the glow-wire test requirements of 8 2.1 1 1 at a temperature
`'
`alues in Table M. 2 Alternatively the material shall comply with the
`
`
`7.2.1.2 Limits of operation of power operated equipment
`
`Replace,
`voltage”.
`
`in the first existing paragraph, "control supply voltage” by “control circuit supply
`
`in the existing paragraph, after the note, "rated control supply voltage” by “rated
`Replace,
`control circuit supply voltage".
`
`Replace, in the first (one occurrence) and second dashed items (two occurrences) of the fifth
`existing paragraph,
`introduced by Amendment 1, "rated control supply voltage” by "rated
`control circuit supply voltage“.
`
`Page 10 of 106
`
`

`

`IEC 60947-1:2007/AMD2:2014
`© lEC 2014
`
`— 9 —
`
`7.2.1.4 Limits of operation of shunt releases
`
`in the existing paragraph, "rated control supply voltage" by "rated control circuit
`Replace,
`supply voltage”.
`
`7.2.2.5 Control circuits
`
`Add, after the existing text, the following new paragraph:
`
`Digital inputs and/or digital outputs contained in switchgear and controlgear, and intended to
`be compatible with programmable logic controllers (PLCs) are covered by Annex 8.
`
`Replace, in the existing text, "plastics and insulating materials" by ”i
`
`7.2.2.8 Other parts
`
`7.2.3.3 Clearances
`
`Replace, in the second sentence of the second paragraph
`or higher than".
`
`
`.. .
`
`
`'are equal to
`
`
`
`7.2.3.5 Solid insulation
`
`Delete the last existing sentence of thi
`
`
`
`
`
`7.2.8 Pole impe an
`
`o ~
`
`Where the pole i
`
`7.3.3.1 Equip
`
`Replace the -
`
`NOTE For equipment not incorporating electronic circuits, eiectromagnetic disturbances can only be generated by
`equipment during occasional switching operations. The duration of the disturbances is less than 200 ms in accordance
`with CISPR 22.
`
`The frequency, the level and the consequences of these emissions are considered as part of
`the normal electromagnetic environment of low«voltage installations.
`
`7.3.3.2.1 Limits for high-frequency emissions
`
`Replace the first three existing paragraphs of this subclause by the following new text and
`new note:
`
`The high—frequency (greater than 9 kHz) continuous emissions from equipment incorporating
`electronic switching circuits shall not exceed the limits specified in the relevant product
`standard, based on CISPR 11 for environment A and for environment B.
`
`NOTE One—time disturbances no longer than 200 ms need no further evaluation.
`
`Page 11 of 106
`
`

`

`— 10 —
`
`[EC 60947—1 :2007/AMD212014
`© IEC 2014
`
`8.2 Compliance with constructional requirements
`
`in the 4m existing dash of the list, "the mechanical properties of terminals” by "the
`Replace,
`mechanical and electrical properties of terminals”.
`
`8.2.4.1 General conditions for tests
`
`Replace, in the second sentence, the reference to ”lEC 60028" by "IEC 60228".
`
`8.2.4.7 Electrical performance of screwless-type clamping units
`
`Replace,
`in the existing Note 1 introduced by Amendment 1,
`the references "(2.3.30)" and
`"(2.3.31)" by "(2.3.24)" and "(2.3.35)" respectively.
`
`product, For the smallest cross—sectional area, the test current is given in
`1:2009.
`
`8.2.4.8 Ageing test for screwless-type clamping un'
`
`-
`
`in the existing Note 1 introduced by Ams
`Replace,
`"(2.8.31)" by "(2.3.34)" and "(2.3.35)" respectivel.
`
`-
`
`-nces "(2.3.30)" and
`
`
`
`
`product. For the smallest cross-sectional area the fit” .
`t
`‘ g‘eh in Table4 and Table 5 of IEC 60947-7—
`
`
`
`1:2009.
`
`8.3.2 General test c.
`
`—
`
`the test: 5 mt ge rally applied is im or [the declared for the
`
`IEC 61439 series".
`
`
`
`8.3.2.2.3 R
`
`8.3.3.2.1 Power - -
`2 ated equipment
`
`
`Replace, in the second existing paragraph, introduced by Amendment 1, ”rated control supply
`voltage" by “rated control circuit supply voltage“.
`
`Replace the fifth existing paragraph added by Amendment 1 by the following new paragraph:
`
`The value of the capacitor shall be
`
`C=30+200000l(f><U)
`
`where
`
`C is expressed in nF;
`
`f
`
`is the minimum rated frequency expressed in Hz;
`
`Page 12 of 106
`
`

`

`[EC 60947-112007lAMD22014
`© JEC 2014
`
`— 11 —
`
`8.3.3.3.1 Ambient air temperature
`
`Replace the second existing paragraph by the following new paragraph:
`
`During the test, the ambient temperature shall be between +10 0C and +40 “C and shall not
`vary by more than ‘10 K. The ambient temperature shall not vary by more than 3 K during the
`last quarter of the test or the last hour of the test, whichever is the shorter. The test shall be
`conducted until this condition is achieved.
`
`Delete the third existing paragraph of this subclause.
`
`8.3.3.4.1 Type tests
`
`Delete Note 2 in the existing item 1).
`
`in the existing item 1), "Note 3” and “Note 4" added by I
`Renumber,
`and "Note 3" respectively.
`
`
`
`
`.
`
`*
`
`ate 2"
`
`in the existing item 3) c).
`Replace,
`text and new note:
`
`
`the text modified by i
`a following new
`
`8.3.3.3.4. The is
`be used in a
`'i
`
`
`
`The impedance per pole is defined as follows:
`
`2 = Ud / l“.1 [Q]
`
`The declared value (see 5.1 modified by this Amendment 2),
`poles, shall be the average value obtained from the tests.
`
`in the case of multiple identical
`
`Care should be taken that voltage drop measurement does not significantly affect
`temperature rise nor affect significantly the impedance.
`
`the
`
`NOTE The method is the same irrespective of the number of poles of the switching device.
`
`8.4 Tests for EMC
`
`Page 13 of 106
`
`

`

`H 12 e
`
`iEC 60947—112007/AMD212014
`© IEC 2014
`
`Emission and immunity tests are type tests and shall be carried out using the manufacturer’s
`instructions for installation in accordance with the reference EMC standards.
`
`The product standard shall specify any particular test condition (e.g. use of an enclosure) and
`additional measures necessary to verify the performance criteria of
`the product
`(e.g.
`application of dwell times).
`
`Add, before the existing Subclause 8.4.2, the following new subclause:
`
`8.4.1.2.9 Harmonics in the supply
`
`Under consideration.
`
`Table 1 — Standard cross-sections of round copper conduc -
`relationship between mm2 and AWlecmil sizes
`
`
`uroximate
`
`
`
`Replace, in the existing title of this table, "Standard” by "No
`table “Rated” by "Nominal”.
`
`
`
`Table 3 — Temperature-rise limits of accessible par
`in order to delete the reference to footnote b, repla e r s
`'
`s which need not be
`
`touched during normal operation b:" by "Parts
`operation".
`
`8.3.2.1)".
`
`
`
`Figure 14 —- Verif" ati
`
`Replace the exiQ '
`
`Page 14 of 106
`
`

`

`IEC 60947—1:20071AMD2:2014
`© IEC 2014
`
`— 13 —
`
`a) Calibration of the circuit
`Prospective peak making
`
`Time
`
`Voltage
`
`current = A2
` U
`
`
`
`c) Oscillogram corresponding to a
`break before the current has
`reached its maximum value
`
`Short—circuit breaking capacity:
`Current l 2 A2 at voltage U : Bz
`Shortrcircuit making capacity:
`Current .' = A2 at voltage U z B
`
`”30
`
`Table 12A — Dielectric test voltage corresponding to the rated insulation voltage
`
`Replace the existing footnote b of this table by the following new footnote:
`
`" Test voltages based on 6.1.3.4.1, fifth paragraph, of EC 60664—12007.
`
`Annex A — Examples of utilization categories for low-voltage switchgear and
`controlgear
`
`Replace the existing title and text of this annex by the following:
`
`Page 15 of 106
`
`

`

`— 14 —
`
`IEC 60947—1:2007/AMD2:2014
`© IEC 2014
`
`Annex A
`
`(informative)
`
`Harmonisation of utilization categories
`for low-voltage switchgear and controlgear
`
`The lEC 60947 series contains different parts specifying requirements for different types of
`[ow-voltage switchgear. Standards for products covered by the IEC 6094? series have been
`developed at different periods of time and by various working groups.
`It resutts in many
`utilization categories for similar applications in the lEC 6094? series.
`
`
`
`to give the harmonisation framew- '
`The objective of this annex is
`switchgear and controlgear as given in Table A. 1. A future objectiv:
`specify a common set of requirements for testing of the products
`lEC 60947 series.
`
`fo
`
`the ow voltage
`.t-ion is to
`
`
`
`The intended benefits are to:
`
`
`
`
`simplify the standards by bringing all similar cateuries
`
`categories;
`
`
`
`—
`
`a
`
`help the user in the selection of equ ment f
`
`Table A1 — Utilizationfi
`
`
`Relevant
`_ategory
`
`
`
`lEC product
`standard
`
`
`
`IEC 609477
`
`
`3:2008, Amd
`
`1 {2012)
`
`
`Squirrel—cage motors
`
`Squirrel—cage motors: plugginga, inchingb
`IEC 50947.
`
`
`.
`442009,
`
`Amd 1
`DIscharge tamp batlasts
`
` Incandescent lamps (2012)
`Transformers
`
`Capacitor banks
`
` Hermetic refrigerant compressor
`
` Slip ring motor stators: B h duty with on-load currents for
`start, acceleration. run
`Slip r‘Ing motor stators: intermittent duty
`
`Squirrel-cage motors: 8 h duty with on-load currents for start,
`
`
`IEC 60947—
`acceleration, run
`
`4-2:2011
`
`
` Squirrel—cage motors: intermittent duty
`
`
`Hermetic refrigerant compressor motors with automatic
`resetting of overload releases: 8 h duty with on-Ioad currents
`
`for start, acceleration, run
`
`
`
`Page 16 of 106
`
`

`

`Hermetic refrigerant compressor motors with automatic
`resetting of overload releases: intermittent duty
`
`—— 15 —
`lEC 60947-1:20071AMD2:2014
`© EC 2014
`Relevant
`
`IEC product
`Typical switched load
`standard
`
`
`
`
`
`
` Non-inductive or slightly inductive loads
`IEC 60947—
`
`
`4-3:1999
` Discharge lamps ballast
`
`
`Amd 1
`
`
`Incandescent lamps
`(2006)
`
`
`
`Transformers
`Amd 2
`
`(2011)
` Capacitor banks
`
`Resistive loads and solid-state loads with isolatio
`
`
`optocouplers
`
`
` Solid—state loads with transformer isolation
`
` Small electromagnetic loads
`3.6. electromagnetic loads
`
`1E05094r
`
`
`
`5-2200?
`
`
`Amd1
`
`
`@013
`
`
`
`IEC 60947-
`671:2005
`
`use 5094?—
`
`
`5-22002
`Amd1
`
`(2007)
`
`Discharge lamp ballasts
`
`incandescent lamps
`
`Slightly inductive loads for household appliances and similar
`.
`.
`lEC 610952
`
`applications
`009
`
`
` Motor-loads for household applications
`Connecting and disconnecting under no-Ioad conditions
`
`
`Resistive loads, including moderate overloads
`[EC 6094?-
`
`
`
`32008, Amd
`Mixed resistive and inductive loads, including moderate
`
`1 (2012)
`
`overloads (eg. shunt motors)
`
`
`Highly inductive loads (6.9. series motors)
`
`
` Non-inductive or slightly inductive loads
`
`IEC 609477
`
`
`
`Shunt-motors
`4712009,
`Series~motors
`Amd 1
`
`
`
`(2012)
`
`
`
`Incandescent lamps
`
`Control of resistive loads and solid~state loads with isolation
`
`571:2003
`by optocouplers
`IEC 60947—
`
`
`Page 17 of 106
`
`

`

`— 16 —
`
`lEC 50947~1i2007lAMD2i2014
`© [EC 2014
`
`Typical switched load
`
`Relevant
`IEC product
`standard
`
`Control of electromagnetic loads having economy resistors in
`circuit
`
`(2009)
`
`Control of resistive loads and solid state loads with optical
`isolation
`
`Control of electromagnets
`Non—inductive or slightly inductive loads
`
`DC—14
`
`[DC-12
`
`DC-13
`
`DC-1
`
`DC-3
`
`DC—S
`
`IEC 60947-
`5-212007
`Amd 1
`(2012)
`
`IEC 80941
`54:2005
`Shunt-motors
`Incandescent lamps
`
`Distribution circuits comprising mixed resisti - -
`loads having a resultant inductive react
`'
`.
`
`Non-inductive or slightly inductive lad
`Shuntsmotors
`.
`
`IEC 50947-
`6-212002
`Amd 1
`(2007)
`
`Series~moto rs Incandesce r
`
`Page 18 of 106
`
`

`

`IEC 60947-1:2007/AMD2:2014
`© IEC 2014
`
`— 17 —
`
`Annex K
`
`(normative)
`
`Procedure to determine reliability data for electromechanical
`devices used in functional safety applications
`
`K.1 General
`
`K.1.1 Overview
`
`K.1.2 Scope and object
`
`Provision of these data is optional. at the discretion of the manufacturer
`
`
`
`This annex specifies procedures for
`the provision of sp .
`
`-rising the
`demand or
`performance of electromechanical devices in functional saf-
`
`continuous mode of operation as defined in [EC 61508.
`
`This method is not applicable to electronic parts.
`
`
`
`
`
`These data are requir
`IEC 62061, ISO 13849 1.
`
`
`andards
`
`
`including IEC 61508 series,
`
`The product st
`considered.
`
`r
`
`
`
`his annex may be further specified by the relevant product standard in
`The requirements 0
`terms of relevant tests, failure modes and their ratios.
`
`The confidence level related to failure rate calculation during the useful life of the device shall
`be at |east60 %.
`
`NOTE The parameters associated with the reliability data are chosen for being consistent with those of other
`products also used in functional safety applications.
`
`The statistical data obtained according to this annex are valid only during the useful life of the
`device.
`
`to keep statistical consistency,
`In this annex,
`operation cycles.
`
`the term "time" can refer to the number of
`
`This annex does not consider replacement of parts of the devices during test and application.
`
`Page 19 of 106
`
`

`

`— ‘18 —
`
`IEC 60947-1:2007/AMD2:2014
`© IEC 2014
`
`K.2 Terms, definitions and symbols
`
`K.2.1 Terms and definitions
`
`K.2.1.1
`reliability (performance)
`ability of an item to perform a required function under given conditions for a given time
`interval
`
`[191—02—06, modified]
`
`K.2.1.2
`useful life
`
`under given conditions, the time interval beginning at a given instant o
`the failure rate becomes unacceptable
`
`
`-. ding when
`
`
`NOTE The useful life may be expressed in number of operations.
`
`K.2.1.3
`
`[19140—09]
`
`
`
`
`constant failure rate period
`
`the failure rate is
`that period,
`if any,
`in the life of a non—repaire-
`
`approximately constant
`
`
`
`K.2.1.4
`overall lifetime
`
`lifetime of the device whi
`
`
`NOTE 1 Overall lifetime c:-
`
`of years, Q
`
`NOTE 2
`
`Itcorrespon
`
`t- ‘
`
`
`
`K.2.1.5
`censoring
`termination c
`
`are still it
`
`
`
`
`
`
`K.2.1.5
`suspension
`situation in which .- item that either has not failed or has not failed in the manner under
`investigation, i.e. failed due to some other cause, is removed from test
`
`K.2.1.7
`no-make-break-current utilization
`
`conditions in which the switching device makes and breaks without load
`
`K.2.1.8
`time to failure
`operating time accumulated from the first use, or from restoration, until failure
`
`NOTE The time to failure may be expressed in number of operations.
`
`K.2.2 Symbols
`
`n
`
`number of samples tested
`
`Page 20 of 106
`
`

`

`lEC 60947—1:2007/AMD2:2014
`© lEC 2014
`
`— 19 —
`
`1‘
`
`:7
`
`,6
`
`11”
`
`,1
`
`AD
`r2
`
`number of operating cycles
`
`Weibull characteristic life or scale parameter
`
`Weibull shape parameter
`
`number of operations per hour
`
`assessed failure rate (upper limit) at confidence level of 60 % expressed in per
`operation
`
`failure rate expressed in per hour
`
`dangerous failure rate expressed in per hour
`coefficient of determination
`
`K.3.1 General method
`
`K.3 Method based on durability test results
`
`In order to address random hardware failure the met
`
`continuous monitoring of the devices under the approp '
`
`
`K.3.2 Test requirements
`
`
`
`The number of s
`according to lEC '
`-'
`
`.
`'
`'
`~-
`of samples should take into account the statistical method (see Clause 4 of
`'
`- uncer-inty of the confidence level of the reliability data to be obtained.
`
`NOTE Thi
`lEC 6164 .
`
`
`
`the
`the manufacturer,
`If not otherwise s-ecified by the relevant product standard or
`occurrence of one or more of the failure modes iisted in Table K.1 shall lead to the conclusion
`
`of the test for that sample. These data shall be recorded.
`
`NOTE The attainment of the specified number of operating cycles given by the manufacturer may also lead to the
`conclusion of the test (censoring or suspension of tests). Nevertheless a sufficient number of failures should be
`recorded in order to enable the statistical analysis.
`
`Table K.1 — Failure modes of devices
`
`
`Failure modes
`
`Characteristics for a switching contact
`
`
`
`Failure to open
`
`current remaining in one or more poles after the time for normal opening
`operation
`
`Failure to close
`no current in one or more poles after the normal time to close
`
`insulation failure between two poles or between any pole and any adjacent
`Insulation failure
`conductive parts that result in the loss of a safety function
`
`The test environment shall be in ace--
`
`the reievant product standard.
`
`
`Mechanical durability shall be deter
`break-current utilization th-
`
`
`Electrical durability s
`..
`.
`category defined by th-- [3 9.:
`
`K.3.3 Number .
`
`
`o be ested
`
`as to be chosen as a matter of engineering judgment
`
`Page 21 of 106
`
`

`

`— 20 —
`
`IEC 60947—1 :20071AMD212014
`© [EC 2014
`
`K.3.5 Weibul] modelling
`
`K.3.5.1 Evaluation of data
`
`For the determination of the Weibull characteristic life or scale parameter, the Weibull shape
`parameter and the failure rates proven statistical software or spreadsheet solutions are
`available. The following describe the necessary steps.
`
`K.3.5.2 Modelling method
`
`The reliability data are obtained by modelling the test result data with the Weibull distribution
`according to IEC 61649.
`
`method can be used to get the point estimates of the distributio
`Kolmogorov—Smirnov goodnessof—fit test (H) with the Fisher dist ib
`be checked with Equation (K1) to validate the result data:
`
`
`
`H 2 F,,(2L(r_1)/2i 2 r _
`
`
`
`(K.1 )
`
`NOTE 1
`
`IEC 61649 provides details and exam
`
`if a test is termi
`
`e
`
`before all
`
`items have failed, then the data are
`
`a suspension. N
`ranking. However
`
`;
`
`.
`
`-
`
`.
`
`'
`‘
`
`as included in the analysis by adjustment of the
`.- method for the estimation of Weibull parameters that
`
`
`said to be time @ .
`'
`‘ n has not failed by the failure mode in question is
`
`
`
`K.3.5.3 Me'an a
`
`-ression
`
`Median Rank Regr— ion (MRR) is the preferred method for estimating the parameters of the
`distribution using linear regression techniques with the variabl