SIST IEC 60364-4-43:2009

Low-voltage electrical installations - Part 4-43: Protection for safety - Protection against overcurrent

IEC 60364-4-43:2008 provides requirements for the protection of live conductors from the effects of overcurrents. IEC 60364-4-43:2008 describes how live conductors are protected by one or more devices for the automatic disconnection of the supply in the event of overload (Clause 433) and short-circuit (Clause 434) except in cases where the overcurrent is limited in accordance with Clause 436 or where the conditions described in 433.3 (omission of devices for protection against overload) or 434.3 (omission of devices for protection against short-circuit) are met. Coordination of overload protection and short-circuit protection is also covered (Clause 435). This third edition cancels and replaces the second edition, published in 2001, and constitutes a technical revision. The main changes with respect to the previous edition are:
- Introduction of new informative Annexes B, C and D.
- Information concerning flexible cables added to Scope.
  - Requirements added for overload detection for the neutral conductor for harmonic currents.
- Requirement that devices for protection against short-circuit current be capable of making as well as breaking short-circuit current added.
- Information added to clarify protection against overload current.
- Requirements where devices for protection against overload need not be provided expanded.
- Requirements where devices for protection against short-circuit need not be provided expanded.
- Requirements for short-circuit current ratings of busbar trunking systems added.[
]The contents of the corrigendum of October 2008 have been included in this copy.

Installations électriques à basse tension - Partie 4-43: Protection pour assurer la sécurité - Protection contre les surintensités

La CEI 60364-4-43:2008 donne les exigences pour les protections des conducteurs contre les effets des surintensités. Cette norme décrit comment protéger les conducteurs par un appareil ou plus de déconnexion automatique de l'alimentation en cas de surcharge (Article 433) et court-circuit (Article 434), à l'exception où les surintensités sont limitées conformément à l'Article 436 ou si les conditions décrites en 433.3 (omission d'appareils de protection contre les surcharges) ou 434.3 (omission d'appareils de protection contre les courts-circuits) sont remplies. La coordination entre les protections contre les surintensités et les courts-circuits est aussi incluse (Article 435). Cette troisième édition annule et remplace la seconde édition, publiée en 2001, et constitue une révision technique. Les principales modifications par rapport à l'édition précédente sont les suivantes:
- Introduction des nouvelles Annexes B, C et D informatives.
- Ajout d'information dans le domaine d'application concernant les câbles souples.
- Ajout d'exigence pour la détection de surcharge dans le conducteur neutre en cas de courants harmoniques.
- Ajout d'exigence pour que les dispositifs de protection contre les court-circuits soient capables d'opérer aussi bien à l'ouverture qu'à la fermeture sur un courant de court-circuit.
- Développement des exigences où des dispositifs de protection contre les surcharges ne sont pas nécessaire.
- Développement des exigences où des dispositifs de protection contre les courts-circuits ne sont pas nécessaires.
- Ajout d'exigences pour les courants de court-circuit assignés des systèmes de canalisations préfabriquées.[
]Le contenu du corrigendum d'octobre 2008 a été pris en considération dans cet exemplaire.

Nizkonapetostne električne inštalacije - 4-43. del: Zaščitni ukrepi - Zaščita pred nadtoki

General Information

• Status: Withdrawn
• Public Enquiry End Date: 29-Apr-2009
• Publication Date: 07-May-2009
• Withdrawal Date: 30-Nov-2023
• ICS: 29.120.50 - Fuses and other overcurrent protection devices
• ICS: 91.140.50 - Electricity supply systems
• Technical Committee: ELI - Electrical and communication installations
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 01-Dec-2023
• Due Date: 24-Dec-2023
• Completion Date: 01-Dec-2023
• Directive: TRRTP131 - Tehnična smernica TSG-N-002:2009 - Nizkonapetostne električne inštalacije
• Ref Project: IEC 60364-4-43 - Low-voltage electrical installations - Part 4-43: Protection for safety - Protection against overcurrent

Relations

• Replaces: SIST IEC 60364-4-43:2006 - Low-voltage electrical installations - Part 4-43: Protection for safety - Protection against overcurrent
• Effective Date: 01-Jun-2009

Standards Content (Sample)

SLOVENSKI STANDARD
SIST IEC 60364-4-43:2009
01-junij-2009
1DGRPHãþD
SIST IEC 60364-4-43:2006
1L]NRQDSHWRVWQHHOHNWULþQHLQãWDODFLMHGHO=DãþLWQLXNUHSL=DãþLWDSUHG
QDGWRNL
Low-voltage electrical installations - Part 4-43: Protection for safety - Protection against
overcurrent
Installations électriques à basse tension - Partie 4-43: Protection pour assurer la sécurité
- Protection contre les surintensités
Ta slovenski standard je istoveten z: IEC 60364-4-43
ICS:
29.120.50 9DURYDONHLQGUXJD Fuses and other overcurrent
PHGWRNRYQD]DãþLWD protection devices
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
SIST IEC 60364-4-43:2009 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST IEC 60364-4-43:2009

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SIST IEC 60364-4-43:2009
IEC 60364-4-43
Edition 3.0 2008-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ
Low-voltage electrical installations –
Part 4-43: Protection for safety – Protection against overcurrent

Installations électriques à basse tension –
Partie 4-43: Protection pour assurer la sécurité – Protection contre les
surintensités

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
V
CODE PRIX
ICS 29.120.50; 91.140.50 ISBN 2-8318-9922-2
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

---------------------- Page: 3 ----------------------

SIST IEC 60364-4-43:2009
– 2 – 60364-4-43 © IEC:2008
CONTENTS
FOREWORD.4

43 Protection against overcurrent.6
430.1 Scope.6
430.2 Normative references.6
430.3 General requirements.7
431 Requirements according to the nature of the circuits.7
431.1 Protection of line conductors .7
431.2 Protection of the neutral conductor .7
431.3 Disconnection and reconnection of the neutral conductor in multi-phase
systems .8
432 Nature of protective devices .8
432.1 Devices providing protection against both overload current and short-circuit
current.8
432.2 Devices ensuring protection against overload current only.9
432.3 Devices ensuring protection against short-circuit current only.9
432.4 Characteristics of protective devices.9
433 Protection against overload current .9
433.1 Coordination between conductors and overload protective devices.9
433.2 Position of devices for overload protection.10
433.3 Omission of devices for protection against overload .10
433.4 Overload protection of conductors in parallel .11
434 Protection against short-circuit currents .12
434.1 Determination of prospective short-circuit currents .12
434.2 Position of devices for short-circuit protection.12
434.3 Omission of devices for protection against short-circuit .12
434.4 Short-circuit protection of conductors in parallel .13
434.5 Characteristics of short-circuit protective devices .13
435 Coordination of overload and short-circuit protection .15
435.1 Protection afforded by one device.
...

SLOVENSKI SIST IEC 60364-4-43


STANDARD junij 2009













Nizkonapetostne električne inštalacije – 4-43. del: Zaščitni ukrepi –
Zaščita pred nadtoki

Low-voltage electrical installations – Part 4-43: Protection for safety –
Protection against overcurrent

Installations électriques à basse tension – Partie 4-43: Protection pour assurer la
sécurité – Protection contre les surintensités

















Referenčna oznaka
ICS 29.120.50; 91.140.50 SIST IEC 60364-4-43:2009 (sl)


 Nadaljevanje na straneh od 2 do 30


© 2009–09: Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov standarda ni dovoljeno.

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SIST IEC 60364-4-43 : 2009
NACIONALNI UVOD
Standard SIST IEC 60364-4-43 (sl), Nizkonapetostne električne inštalacije – 4-43. del: Zaščitni ukrepi
– Zaščita pred nadtoki, 2009, ima status slovenskega standarda in je istoveten mednarodnemu
standardu IEC 60364-4-43 (en), Low-voltage electrical installations – Part 4-43: Protection for safety –
Protection against overcurrent, 2008.
NACIONALNI PREDGOVOR
Mednarodni standard IEC 60364-4-43:2008 je pripravil tehnični odbor Mednarodne elektrotehniške
komisije IEC/TC 64 Električne inštalacije in zaščita pred električnim udarom.
Slovenski standard SIST IEC 60364-4-43:2009 je prevod mednarodnega standarda IEC 60364-4-
43:2008. V primeru spora glede besedila slovenskega prevoda v tem standardu je odločilen izvirni
evropski standard v angleškem jeziku. Slovensko izdajo standarda je pripravil tehnični odbor SIST/TC
ELI Nizkonapetostne in komunikacijske električne inštalacije.
Odločitev za privzem tega standarda po metodi ponatisa je dne 18. marca 2009 sprejel tehnični odbor
SIST/TC ELI. Hkrati je odbor tudi sklenil, da se pripravi prevod standarda.
OSNOVA ZA IZDAJO STANDARDA
Privzem standarda IEC 60364-4-43:2008.
ZVEZE S STANDARDI
S privzemom tega evropskega standarda veljajo za omenjeni namen referenčnih standardov vsi
standardi, navedeni v izvirniku, razen tistih, ki so že sprejeti v nacionalno standardizacijo:
SIST EN 60269-1:2007 Nizkonapetostne varovalke – 1. del: Splošne zahteve (IEC 60269-
1:2006)
SIST EN 60269-4:2007 Nizkonapetostne varovalke – 4. del: Dodatne zahteve za taljive
vložke za zaščito polprevodniških naprav (IEC 60269-4:2006)
SIST HD 60269-2:2008 Nizkonapetostne varovalke – 2. del: Dodatne zahteve za varovalke, ki
jih uporabljajo strokovne osebe (uporaba varovalk zlasti v industriji) –
Primeri tipov standardiziranih varovalk od A do I (IEC 60269-2:2006)
SIST HD 60269-3:2008 Nizkonapetostne varovalke – 3. del: Dodatne zahteve za varovalke, ki
jih uporabljajo nestrokovne osebe (uporaba varovalk zlasti v
gospodinjstvu in podobnih okoljih) – Razdelki od A do F: Primeri tipov
standardiziranih varovalk (IEC 60269-3:2006)
SIST IEC 60364-4-41:2006 Nizkonapetostne električne inštalacije – 4-41. del: Zaščitni ukrepi –
Zaščita pred električnim udarom
SIST IEC 60364-5-52:2006 Električne inštalacije zgradb – 5-52. del: Izbira in namestitev
električne opreme – Inštalacijski sistemi
SIST EN 60439-2:2000 Sestavi nizkonapetostnih stikalnih in krmilnih naprav – 2. del:
Posebne zahteve za zbiralčne razdelilne sisteme (zbiralčna vodila)
(IEC 60439-2:2000)
SIST EN 60898 (vsi deli) Električni pribor – Odklopniki za nadtokovno zaščito za gospodinjstvo
in podobne inštalacije
SIST EN 60947-2:2006 Nizkonapetostne stikalne naprave – 2. del: Odklopniki (IEC 60947-
2:2006)
SIST EN 60947-3:2000 Nizkonapetostne stikalne in krmilne naprave – 3. del: Stikala, ločilniki,
ločilna stikala in stikalni aparati z varovalkami
2

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SIST IEC 60364-4-43 : 2009
SIST EN 60947-6-2:2003 Nizkonapetostne stikalne naprave – 6. del: Večfunkcijska oprema –
2. oddelek: Krmilne in zaščitne stikalne naprave (ali oprema) (CPS)
(IEC 60947-6-2:2002)
SIST EN 61009 (vsi deli) Odklopniki na preostali (residualni) tok z vgrajeno nadtokovno zaščito
za gospodinjsko in podobno rabo (RCBO's)
SIST EN 61534 (vsi deli) Sistemi zbiralčnih vodnikov

OPOMBI
– Nacionalni uvod in nacionalni predgovor nista sestavni del standarda.
– Povsod, kjer se v besedilu standarda uporablja izraz “mednarodni standard”, v
SIST IEC 60364-4-43:2009 to pomeni “slovenski standard”.

3

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SIST IEC 60364-4-43 : 2009
VSEBINA Stran

Predgovor .5
43 Nadtokovna zaščita .7
430.1 Področje uporabe .7
430.2 Zveza s standardi .
...

SLOVENSKI STANDARD
oSIST IEC 60364-4-43:2009
01-april-2009
1L]NRQDSHWRVWQHHOHNWULþQHLQãWDODFLMHGHO=DãþLWQLXNUHSL=DãþLWDSUHG
QDGWRNL
Low-voltage electrical installations - Part 4-43: Protection for safety - Protection against
overcurrent
Installations électriques à basse tension - Partie 4-43: Protection pour assurer la sécurité
- Protection contre les surintensités
Ta slovenski standard je istoveten z: IEC 60364-4-43
ICS:
29.120.50 9DURYDONHLQGUXJD Fuses and other overcurrent
PHGWRNRYQD]DãþLWD protection devices
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
oSIST IEC 60364-4-43:2009 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST IEC 60364-4-43:2009

---------------------- Page: 2 ----------------------
SIST IEC 60364-4-43:2009
IEC 60364-4-43
Edition 3.0 2008-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ
Low-voltage electrical installations –
Part 4-43: Protection for safety – Protection against overcurrent

Installations électriques à basse tension –
Partie 4-43: Protection pour assurer la sécurité – Protection contre les
surintensités

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
V
CODE PRIX
ICS 29.120.50; 91.140.50 ISBN 2-8318-9922-2
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

---------------------- Page: 3 ----------------------
SIST IEC 60364-4-43:2009
– 2 – 60364-4-43 © IEC:2008
CONTENTS
FOREWORD.4

43 Protection against overcurrent.6
430.1 Scope.6
430.2 Normative references.6
430.3 General requirements.7
431 Requirements according to the nature of the circuits.7
431.1 Protection of line conductors .7
431.2 Protection of the neutral conductor .7
431.3 Disconnection and reconnection of the neutral conductor in multi-phase
systems .8
432 Nature of protective devices .8
432.1 Devices providing protection against both overload current and short-circuit
current.8
432.2 Devices ensuring protection against overload current only.9
432.3 Devices ensuring protection against short-circuit current only.9
432.4 Characteristics of protective devices.9
433 Protection against overload current .9
433.1 Coordination between conductors and overload protective devices.9
433.2 Position of devices for overload protection.10
433.3 Omission of devices for protection against overload .10
433.4 Overload protection of conductors in parallel .11
434 Protection against short-circuit currents .12
434.1 Determination of prospective short-circuit currents .12
434.2 Position of devices for short-circuit protection.12
434.3 Omission of devices for protection against short-circuit .12
434.4 Short-circuit protection of conductors in parallel .13
434.5 Characteristics of short-circuit protective devices .13
435 Coordination of overload and short-circuit protection .15
435.1 Protection afforded by one device.15
435.2 Protec
...