Safety requirements for power electronic converter systems and equipment - Part 2: Power electronic converters from 1 000 V AC or 1 500 V DC up to 36 kV AC or 54 kV DC

IEC 62477-2:2018 applies to power electronic converter systems (PECS) and equipment, their components for electronic power conversion and electronic power switching, including the means for their control, protection, monitoring and measurement, such as with the main purpose of converting electric power, with rated system voltages from 1 000 V AC or 1 500 V DC up to 36 kV AC or 54 kV DC. This document can also be used as a reference standard for product committees producing product standards for  adjustable speed electric power drive systems (PDS), standalone uninterruptible power systems (UPS), and stabilized DC power supplies.  For PECS for which no product standard exists, this document provides minimum requirements for safety aspects. This document has the status of a group safety publication in accordance with IEC Guide 104 for power electronic converter systems and equipment for solar, wind, tidal, wave, fuel cell or similar energy sources. According to IEC Guide 104, one of the responsibilities of technical committees is, wherever applicable, to make use of basic safety publications and/or group safety publications in the preparation of their product standards. This document  establishes a common terminology for safety aspects relating to PECS and equipment, establishes minimum requirements for the coordination of safety aspects of interrelated parts within a PECS, establishes a common basis for minimum safety requirements for the PEC portion of products that contain PEC, specifies requirements to reduce risks of fire, electric shock, thermal, energy and mechanical hazards, during use and operation and, where specifically stated, during service and maintenance, specifies minimum requirements to reduce risks with respect to pluggable and permanently connected equipment, whether it consists of a system of interconnected units or independent units, subject to installing, operating and maintaining the equipment in the manner prescribed by the manufacturer, establishes an arc fault rating label requirement with testing instructions for PEC and PECS, and covers power electronic converters and systems in open type design, which are catalog (pre-defined commercially available) power electronic converters and systems or engineered solutions from same.  This document does not cover  telecommunications apparatus other than power supplies to such apparatus, functional safety aspects as covered by, for example, IEC 61508 (all parts), electrical equipment and systems for railways applications and electric vehicles, and power electronic converters and systems in open type design, which are – in their major part – dimensioned, designed and constructed according to the user’s individual requirements and specifications and follow power installation standards, for example IEC 61936-1.

Sicherheitsanforderungen an leistungselektronische Umrichtersysteme und Betriebsmittel - Teil 2: Leistungselektronische Umrichter von 1 000 V a.c. oder 1 500 V d.c. bis 36 kV a.c. oder 54 kV d.c.

Exigences de sécurité applicables aux systèmes et matériels électroniques de conversion de puissance - Partie 2: Convertisseurs électroniques de puissance entre 1 000 V en courant alternatif ou 1 500 V en courant continu et 36 kV en courant alternatif ou 54 kV en courant continu

L'IEC 62477-2:2018 s'applique aux matériels et aux systèmes électroniques de conversion de puissance (SECP), à leurs composants pour la conversion de puissance électronique et la commande (ouverture et fermeture) électronique de puissance, y compris les moyens de commande, de protection, de surveillance et de mesure, ayant pour principale fonction la conversion de puissance électrique, d'une tension système assignée entre 1 000 V en courant alternatif ou 1 500 V en courant continu et 36 kV en courant alternatif ou 54 kV en courant continu. Le présent document peut également être utilisé comme norme de référence par les comités de produits qui élaborent des normes de produits applicables aux  systèmes d'entraînement électrique de puissance à vitesse variable, alimentations sans interruption (ASI) autonomes, et alimentations stabilisées en courant continu.  Pour les SECP pour lesquels il n'existe pas de norme de produit, le présent document spécifie des exigences minimales pour les aspects de sécurité. La présente document a le statut d’une publication groupée de sécurité conformément au Guide 104 de l'IEC applicable aux systèmes électroniques de conversion de puissance et équipements pour énergie solaire, éolienne, des marées, des vagues, des piles à combustible ou sources d’énergie analogues. Conformément au Guide 104 de l'IEC, il incombe aux comités d'études d'utiliser, dans toute la mesure du possible, les publications fondamentales de sécurité et/ou les publications groupées de sécurité pour l'élaboration de leurs normes de produits. Le présent document  établit une terminologie commune applicable aux aspects de sécurité concernant les matériels et les SECP, établit les exigences minimales pour la coordination des aspects de sécurité des parties interconnectées au sein d'un SECP, établit une base commune applicable aux exigences minimales de sécurité de la partie du convertisseur électronique de puissance (CEP) des produits comprenant un CEP, spécifie des exigences permettant de réduire les risques d'incendie et de choc électrique ainsi que les dangers thermiques, mécaniques et dus à l'énergie électrique, en cours d'utilisation et de fonctionnement et, lorsque cela est spécifiquement indiqué, au cours des opérations d'entretien et de maintenance, spécifie les exigences minimales permettant de réduire ces types de risques concernant les matériels enfichables et connectés en permanence, qu'ils soient constitués d'un système d'unités interconnectées ou d'unités indépendantes, faisant l'objet d'opérations d'installation, de fonctionnement et d'entretien du matériel tel que spécifié par le constructeur, établit les exigences en matière de marquage de caractéristiques assignées de défaut d'arc avec des instructions d'essai pour les CEP et SECP, et couvre les convertisseurs et systèmes électroniques de puissance de type ouvert, qui sont des convertisseurs et systèmes électroniques de puissance de catalogue (prédéfinis comme étant disponibles sur le marché) ou des solutions techniques de catalogue.  Le présent document ne couvre pas  les appareils de télécommunications autres que les alimentations pour ce type d'appareil, les aspects

Varnostne zahteve za močnostne polprevodniške pretvorniške sisteme in opremo - 2. del: Močnostni polprevodniški pretvorniki iz 1000 V izmenično ali 1500 V enosmerno v 36 kV izmenično ali 54 kV enosmerno (IEC 62477-2:2018)

Ta del standarda IEC 62477 se nanaša na močnostne električne pretvorniške sisteme (PECS) in opremo, njihove dele za električno močnostno pretvorbo in električno močnostno preklapljanje, vključno s sredstvi za njihov nadzor, zaščito, nadzorovanje in merjenje, kot z glavnim namenom za pretvorbo električne energije z nazivnimi sistemskimi napetostmi od 1000 voltov izmenične napetosti ali 1500 voltov enosmerne napetosti do 36 kV izmenične napetosti ali 54 kV enosmerne napetosti.
Ta dokument lahko kot referenčni standard uporabljajo odbori za proizvode, ki pripravljajo standarde za proizvode za:
• električne pogonske sisteme z nastavljivo hitrostjo (PDS),
• samostojne sisteme za neprekinjeno napajanje (UPS) in
• napajalnike za stabilizirano napajanje z enosmernim tokom.
Ta dokument določa minimalne varnostne zahteve za močnostne električne pretvorniške sisteme, ki nimajo določenega standarda za proizvod.
Ta dokument ima status publikacije skupinske varnosti, ki je v skladu z vodilom IEC 104 za električne močnostne pretvorniške sisteme in opremo za energijske vire na osnovi sonca, vetra, plimovanja, valovanja, gorivnih celic ali podobnih virov.
Glede na vodilo IEC 104 je ena od dolžnosti tehničnih odborov, da pri pripravi standardov za proizvode uporabijo osnovne varnostne publikacije in/ali publikacije skupinske varnosti, če je to mogoče.
Ta dokument:
• vzpostavlja skupno terminologijo za varnostne vidike v zvezi z močnostnimi električnimi pretvorniškimi sistemi in opremo,
• določa minimalne zahteve za usklajevanje varnostnih vidikov medsebojno povezanih delov znotraj močnostnih električnih pretvorniških sistemov,
• vzpostavlja skupno osnovo za minimalne varnostne zahteve za tiste proizvode, ki vsebujejo močnostne električne pretvornike,
• določa zahteve za zmanjšanje tveganja požara, elektrošoka, toplotnih, energijskih in mehaničnih tveganj med uporabo, delovanjem ter, kjer je to navedeno, popravilom in vzdrževanjem,
• določa minimalne zahteve za zmanjšane tveganja pri opremi, ki se priklopi ali je stalno priklopljena, če je sestavljena iz sistema vzajemno povezanih enot ali samostojnih enot, upoštevajoč namestitev, uporabo in vzdrževanje opreme na način, ki ga je predpisal proizvajalec,
• določa zahtevano oznako napake obloka z navodili za preskušanje močnostnih električnih pretvornikov in močnostnih električnih pretvorniških sistemov ter
• zajema elektronske močnostne pretvornike in sisteme odprtega tipa, ki so katalogizirani (vnaprej določeni in komercialno dostopni) kot močnostni električni pretvorniki in sistemi ali njihove inženirske rešitve.
Ta dokument ne zajema:
• telekomunikacijskih naprav, ki niso napajalniki teh naprav,
• funkcionalne varnosti, ki jo zajema na primer standard IEC 61508 (vsi deli),
• električne opreme in sistemov za uporabo pri železnici in za elektronska vozila ter
• elektronskih močnostnih pretvornikov in sistemov odprtega tipa, ki so večinoma dimenzionirani, oblikovani in izdelani v skladu z individualnimi zahtevami in specifikacijami uporabnika ter ustrezajo standardom za namestitev električnih inštalacij, na primer standardu IEC 61936-1.

General Information

Status
Published
Publication Date
27-Sep-2018
Technical Committee
Drafting Committee
Current Stage
6060 - Document made available
Due Date
02-Apr-2018

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SLOVENSKI STANDARD
SIST EN IEC 62477-2:2019
01-februar-2019
9DUQRVWQH]DKWHYH]DPRþQRVWQHSROSUHYRGQLãNHSUHWYRUQLãNHVLVWHPHLQRSUHPR
GHO0RþQRVWQLSROSUHYRGQLãNLSUHWYRUQLNLL]9L]PHQLþQRDOL9
HQRVPHUQRYN9L]PHQLþQRDOLN9HQRVPHUQR ,(&

Safety Requirements for Power Electronic Converter Systems and Equipment - Part 2:

Power Electronic Converters from 1000 V a.c. or 1500 V d.c. up to 36 kV a.c. or 54 kV

d.c. (IEC 62477-2:2018)
Exigences de sécurité applicables aux systèmes et matériels électroniques de

conversion de puissance - Partie 2: Convertisseurs électroniques de puissance entre 1

000 V en courant alternatif ou 1 500 V en courant continu et 36 kV en courant alternatif

ou 54 kV en courant continu (IEC 62477-2:2018)
Exigences de sécurité applicables aux systèmes et matériels électroniques de

conversion de puissance - Partie 2: Convertisseurs électroniques de puissance entre 1

000 V en courant alternatif ou 1 500 V en courant continu et 36 kV en courant alternatif

ou 54 kV en courant continu (IEC 62477-2:2018)
Ta slovenski standard je istoveten z: EN IEC 62477-2:2018
ICS:
29.200 8VPHUQLNL3UHWYRUQLNL Rectifiers. Convertors.
6WDELOL]LUDQRHOHNWULþQR Stabilized power supply
QDSDMDQMH
SIST EN IEC 62477-2:2019 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 62477-2:2019
---------------------- Page: 2 ----------------------
SIST EN IEC 62477-2:2019
EUROPEAN STANDARD EN IEC 62477-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2018
ICS 29.200
English Version
Safety requirements for power electronic converter systems and
equipment - Part 2: Power electronic converters from 1 000 V
AC or 1 500 V DC up to 36 kV AC or 54 kV DC
(IEC 62477-2:2018)

Exigences de sécurité applicables aux systèmes et Sicherheitsanforderungen an Leistungshalbleiter-

matériels électroniques de conversion de puissance - Partie Umrichtersysteme und -Betriebsmittel - Teil 2:

2: Convertisseurs électroniques de puissance entre 1 000 V Leistungselektronik Umrichter von 1 000 V a.c. oder 1 500

en courant alternatif ou 1 500 V en courant continu et 36 kV V d.c. bis 36 kV a.c. oder 54 kV d.c.

en courant alternatif ou 54 kV en courant continu (IEC 62477-2:2018)
(IEC 62477-2:2018)

This European Standard was approved by CENELEC on 2018-07-26. 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 CEN-CENELEC

Management Centre 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 CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,

Switzerland, Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 62477-2:2018 E
---------------------- Page: 3 ----------------------
SIST EN IEC 62477-2:2019
EN IEC 62477-2:2018 (E)
European foreword

The text of document 22/290/FDIS, future edition 1 of IEC 62477-2, prepared by IEC/TC 22 "Power

electronic systems and equipment" was submitted to the IEC-CENELEC parallel vote and approved by

CENELEC as EN IEC 62477-2:2018.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2019-04-26

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2021-07-26

document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice

The text of the International Standard IEC 62477-2:2018 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards

indicated:
IEC 60071-1:2006 NOTE Harmonized as EN 60071-1:2006 (not modified)
IEC 60071-2:1996 NOTE Harmonized as EN 60071-2:1997 (not modified)
IEC 60146-1-1 NOTE Harmonized as EN 60146-1-1
IEC 60243-1:2013 NOTE Harmonized as EN 60243-1:2013 (not modified)
IEC 60529:1989 NOTE Harmonized as EN 60529:1991 (not modified)
IEC 60721-3 series NOTE Harmonized as EN 60721-3 series
IEC 60990:2016 NOTE Harmonized as EN 60990:2016 (not modified)
IEC 61936-1 NOTE Harmonized as EN 61936-1
IEC 62271-200:2011 NOTE Harmonized as EN 62271-200:2012 (not modified)
IEC 62271-201:2014 NOTE Harmonized as EN 62271-201:2014 (not modified)
---------------------- Page: 4 ----------------------
SIST EN IEC 62477-2:2019
EN IEC 62477-2:2018 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments)

applies.

NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60204-11 - Safety of machinery - Electrical equipment - -
of machines - Part 11: Requirements for
equipment for voltages above 1 000 V AC
or 1 500 V DC and not exceeding 36 kV
IEC 60417-DB - Graphical symbols for use on equipment - -
IEC 60617-DB - Graphical symbols for diagrams - -
IEC 60730-1 - Automatic electrical controls - Part 1: EN 60730-1 -
General requirements
IEC 61230 - Live working - Portable equipment for EN 61230 -
earthing or earthing and short-circuiting
IEC 62271-102 - High-voltage switchgear and controlgear - EN IEC 62271-102 -
Part 102: Alternating current disconnectors
and earthing switches
IEC 62477-1 2012 Safety requirements for power electronic EN 62477-1 2012
converter systems and equipment - Part 1:
General
- - + A11 2014
+ A1 2016 + A1 2017
IEC Guide 104 - The preparation of safety publications and - -
the use of basic safety publications and
group safety publications
ISO/IEC Guide 51 2014 Safety aspects - Guidelines for their - -
inclusion in standards
---------------------- Page: 5 ----------------------
SIST EN IEC 62477-2:2019
---------------------- Page: 6 ----------------------
SIST EN IEC 62477-2:2019
IEC 62477-2
Edition 1.0 2018-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ
Safety requirements for power electronic converter systems and equipment –
Part 2: Power electronic converters from 1 000 V AC or 1 500 V DC up to 36 kV
AC or 54 kV DC
Exigences de sécurité applicables aux systèmes et matériels électroniques de
conversion de puissance –
Partie 2: Convertisseurs électroniques de puissance entre 1 000 V en courant
alternatif ou 1 500 V en courant continu et 36 kV en courant alternatif ou 54 kV
en courant continu
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.200 ISBN 978-2-8322-5787-6

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.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN IEC 62477-2:2019
– 2 – IEC 62477-2:2018 © IEC 2018
CONTENTS

FOREWORD ........................................................................................................................... 7

INTRODUCTION ..................................................................................................................... 9

1 Scope ............................................................................................................................ 10

2 Normative references .................................................................................................... 11

3 Terms and definitions .................................................................................................... 11

4 Protection against hazards ............................................................................................ 12

4.1 General ................................................................................................................. 12

4.2 Fault and abnormal conditions .............................................................................. 13

4.3 Short-circuit and overload protection ..................................................................... 14

4.3.1 General ......................................................................................................... 14

4.3.2 Specification of input short-circuit withstand strength and output short-

circuit current ability ...................................................................................... 14

4.3.3 Short-circuit coordination (backup protection) ................................................ 14

4.3.4 Protection by several devices ........................................................................ 14

4.3.5 Input ports short time withstand current, I .................................................. 14

4.4 Protection against electric shock ........................................................................... 14

4.4.1 General ......................................................................................................... 14

4.4.2 Decisive voltage class ................................................................................... 15

4.4.3 Provision for basic protection ......................................................................... 16

4.4.4 Provision for fault protection .......................................................................... 17

4.4.5 Enhanced protection ...................................................................................... 18

4.4.6 Protective measures ...................................................................................... 18

4.4.7 Insulation ....................................................................................................... 19

4.4.8 Compatibility with residual current-operated protective devices (RCD) ........... 24

4.4.9 Capacitor discharge ....................................................................................... 24

4.5 Protection against electrical energy hazards ......................................................... 26

4.5.1 Operator access areas................................................................................... 26

4.5.2 Service access areas ..................................................................................... 28

4.6 Protection against fire and thermal hazards .......................................................... 28

4.6.1 Circuits representing a fire hazard ................................................................. 28

4.6.2 Components representing a fire hazard ......................................................... 28

4.6.3 Fire enclosures .............................................................................................. 28

4.6.4 Temperature limits ......................................................................................... 29

4.6.5 Limited power sources ................................................................................... 29

4.7 Protection against mechanical hazards ................................................................. 29

4.7.1 General ......................................................................................................... 29

4.7.2 Specific requirements for liquid cooled PECS ................................................ 29

4.8 Equipment with multiple sources of supply ............................................................ 30

4.9 Protection against environmental stresses ............................................................ 30

4.10 Protection against sonic pressure hazards ............................................................ 30

4.10.1 General ......................................................................................................... 30

4.10.2 Sonic pressure and sound level ..................................................................... 31

4.11 Wiring and connections ......................................................................................... 31

4.11.1 General ......................................................................................................... 31

4.11.2 Routing .......................................................................................................... 31

4.11.3 Colour coding ................................................................................................ 31

4.11.4 Splices and connections ................................................................................ 31

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SIST EN IEC 62477-2:2019
IEC 62477-2:2018 © IEC 2018 – 3 –

4.11.5 Accessible connections ................................................................................. 31

4.11.6 Interconnections between parts of the PECS ................................................. 31

4.11.7 Supply connections........................................................................................ 31

4.11.8 Terminals ...................................................................................................... 31

4.12 Enclosures ............................................................................................................ 31

4.12.1 General ......................................................................................................... 31

4.12.2 Handles and manual controls ......................................................................... 32

4.12.3 Cast metal ..................................................................................................... 32

4.12.4 Sheet metal ................................................................................................... 32

4.12.5 Stability test for enclosure ............................................................................. 32

5 Test requirements .......................................................................................................... 32

5.1 General ................................................................................................................. 32

5.1.1 Test objectives and classification ................................................................... 32

5.1.2 Selection of test samples ............................................................................... 33

5.1.3 Sequence of tests .......................................................................................... 33

5.1.4 Earthing conditions ........................................................................................ 33

5.1.5 General conditions for tests ........................................................................... 33

5.1.6 Compliance ................................................................................................... 33

5.1.7 Test overview ................................................................................................ 33

5.2 Test specifications ................................................................................................ 33

5.2.1 Visual inspections (type test, sample test and routine test) ............................ 33

5.2.2 Mechanical tests ............................................................................................ 34

5.2.3 Electrical tests ............................................................................................... 35

5.2.4 Abnormal operation and simulated faults tests ............................................... 38

5.2.5 Material tests ................................................................................................. 42

5.2.6 Environmental tests (type tests) ..................................................................... 42

5.2.7 Hydrostatic pressure test (type test and routine test) ..................................... 43

6 Information and marking requirements ........................................................................... 43

6.1 General ................................................................................................................. 43

6.2 Information for selection ....................................................................................... 43

6.3 Information for installation and commissioning ...................................................... 43

6.3.1 General ......................................................................................................... 43

6.3.2 Mechanical considerations ............................................................................. 43

6.3.3 Environment .................................................................................................. 43

6.3.4 Handling and mounting .................................................................................. 43

6.3.5 Enclosure temperature................................................................................... 43

6.3.6 Connections .................................................................................................. 43

6.3.7 Protection requirements ................................................................................. 44

6.3.8 Commissioning .............................................................................................. 45

6.4 Information for use ................................................................................................ 45

6.4.1 General ......................................................................................................... 45

6.4.2 Adjustment .................................................................................................... 45

6.4.3 Labels, signs and signals ............................................................................... 45

6.5 Information for maintenance .................................................................................. 45

6.5.1 General ......................................................................................................... 45

6.5.2 Capacitor discharge ....................................................................................... 45

6.5.3 Auto restart/bypass connection ...................................................................... 45

6.5.4 Other hazards ................................................................................................ 46

6.5.5 Equipment with multiple sources of supply ..................................................... 46

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SIST EN IEC 62477-2:2019
– 4 – IEC 62477-2:2018 © IEC 2018

Annex A (normative) Additional information for protection against electric shock ................. 47

A.1 General ................................................................................................................. 47

A.2 Protection by means of DVC As ............................................................................ 47

A.3 Protection by means of protective impedance ....................................................... 47

A.4 Protection by using limited voltages ...................................................................... 47

A.5 Evaluation of working voltage and selection of DVC for touch voltage, PELV

and SELV circuits ................................................................................................. 47

A.6 Evaluation of the working voltage of circuits .......................................................... 47

A.7 Examples of the use of elements of protective measures ...................................... 47

Annex B (informative) Considerations for the reduction of the pollution degree .................... 49

Annex C (informative) Symbols referred to in IEC 62477-1 .................................................. 50

Annex D (normative) Evaluation of clearance and creepage distances ................................. 51

Annex E (informative) Altitude correction for clearances ...................................................... 52

Annex F (normative) Clearance and creepage distance determination for frequencies

greater than 30 kHz .............................................................................................................. 53

Annex G (informative) Cross-sections of round conductors .................................................. 54

Annex H (informative) Guidelines for RCD compatibility ....................................................... 55

H.1 Selection of RCD type ........................................................................................... 55

Annex I (informative) Examples of overvoltage category reduction ....................................... 56

Annex J (informative) Burn thresholds for touchable surfaces .............................................. 57

Annex K (informative) Table of electrochemical potentials ................................................... 58

Annex L (informative) Measuring instrument for touch current measurements ...................... 59

L.1 Measuring instrument............................................................................................ 59

Annex M (informative) Test probes for determining access .................................................. 60

Annex N (informative) Guidance regarding short-circuit current............................................ 61

Annex AA (normative) Arc fault test and labelling requirements ........................................... 62

AA.1 Overview............................................................................................................... 62

AA.2 References ........................................................................................................... 62

AA.3 Terms and definitions ............................................................................................ 62

AA.4 Ratings ................................................................................................................. 65

AA.4.1 General ......................................................................................................... 65

AA.4.2 Internal arc classification ............................................................................... 65

AA.5 Testing ................................................................................................................. 70

AA.5.1 General ......................................................................................................... 70

AA.5.2 Test preparation ............................................................................................ 71

AA.5.3 Test conditions .............................................................................................. 77

AA.5.4 Assessment ................................................................................................... 86

AA.6 Arc-prohibiting design ........................................................................................... 89

AA.6.1 General ......................................................................................................... 89

AA.6.2 Requirements ................................................................................................ 90

AA.6.3 Testing .......................................................................................................... 91

AA.7 Information and marking requirements .................................................................. 92

AA.7.1 General ......................................................................................................... 92

AA.7.2 IAC rating plate ............................................................................................. 93

AA.7.3 Information in manuals .................................................................................. 94

AA.7.4 Product marking – Internal protection ............................................................ 96

AA.8 Internal arc classification concepts ....................................................................... 96

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SIST EN IEC 62477-2:2019
IEC 62477-2:2018 © IEC 2018 – 5 –

AA.8.1 General ......................................................................................................... 96

AA.8.2 Discription of risk and selection of equipment ................................................ 98

AA.8.3 Causes and preventative measures ............................................................... 98

AA.8.4 Protection ...................................................................................................... 99

AA.8.5 Considerations for selection and installation ................................................ 100

AA.8.6 Requirements for concepts 5 and 6.............................................................. 101

AA.8.7 Installation of PECS with general public access ........................................... 101

Bibliography ........................................................................................................................ 103

Figure AA.1 – Mounting frame for vertical indicators ............................................................. 72

Figure AA.2 – Horizontal indicator ......................................................................................... 73

Figure AA.3 – Arrangement of indicators for different height of equipment ............................ 75

Figure AA.4 – Example for two adjacent accessible sides ..................................................... 75

Figure AA.5 – Examples for an accessible side to a non-accessible side ............................. 76

Figure AA.6 – General setup for testing – Details .................................................................. 78

Figure AA.7 – General setup for calibration ........................................................................... 78

Figure AA.8 – General setup for testing ................................................................................ 78

Figure AA.9 – General setup for user installation .................................................................. 79

Figure AA.10 – Power drive system with 12-pulse diode rectifier supplied by an

external transformer and a motor at the output ...................................................................... 80

Figure AA.11 – Power drive system with integrated transformer and a motor at the

output ................................................................................................................................... 81

Figure AA.12 – Grid interconnection between 50 Hz and 60 Hz grids .................................... 82

Figure AA.13 – Example for test of sub-assemblies of a PECS ............................................. 86

Figure AA.14 – Installation example of mix of accessibility types including 4a or 4b ............ 102

Table 5 – Steady state voltage limits for the decisive voltage classes ................................... 15

Table 6 – Protection requirements for circuit under consideration ......................................... 16

Table 101 – Impulse withstand voltage and temporary overvoltage versus system

voltage from 1 000 V AC or 1 500 V DC up to 36 kV AC or 54 kV DC .................................... 20

Table 102 – Clearance distances for functional, basic or supplementary insulation .............. 22

Table 103 – Creepage distances (in millimetres) ................................................................... 23

Table 104 – Limits for power sources without an overcurrent protective device ..................... 27

Table 105 – Limits for power sources with an overcurrent protective device ......................... 28

Table 22 – Test overview .............................................................................................

...

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