IEC 60364-5-53:2019/AMD2:2024

IEC 60364-5-53 ®
Edition 4.0 2024-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 2
AMENDEMENT 2
Low-voltage electrical installations –
Part 5-53: Selection and erection of electrical equipment – Devices for protection
for safety, isolation, switching, control and monitoring

Installations électriques à basse tension –
Partie 5-53: Choix et mise en œuvre des matériels électriques – Dispositifs de
protection pour assurer la sécurité, le sectionnement, la coupure, la commande
et la surveillance
IEC 60364-5-53:2019-02/AMD2:2024-12(en-fr)

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IEC 60364-5-53 ®
Edition 4.0 2024-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 2
AMENDEMENT 2
Low-voltage electrical installations –

Part 5-53: Selection and erection of electrical equipment – Devices for protection

for safety, isolation, switching, control and monitoring

Installations électriques à basse tension –

Partie 5-53: Choix et mise en œuvre des matériels électriques – Dispositifs de

protection pour assurer la sécurité, le sectionnement, la coupure, la commande

et la surveillance
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.01, 91.140.50 ISBN 978-2-8327-0097-6

– 2 – IEC 60364-5-53:2019/AMD2:2024
© IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE ELECTRICAL INSTALLATIONS –

Part 5-53: Selection and erection of electrical equipment – Devices
for protection for safety, isolation, switching, control and monitoring

AMENDMENT 2
FOREWORD
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Amendment 2 to IEC 60364-5-53:2019 has been prepared by IEC technical committee 64:
Electrical installations and protection against electric shock.
The text of this Amendment is based on the following documents:
Draft Report on voting
64/2648/FDIS 64/2738/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
© IEC 2024
The language used for the development of this Amendment is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications/.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
___________
534 Devices for protection against transient overvoltages
534.1 General
Replace the last paragraph with the following new paragraph:
Annex H provides additional information for the application of DC SPDs.
534.4.1 SPD location and SPD test class
Replace, in the sixth paragraph, "Table 1" with "IEC 60364-4-44:2024, Table 3"
534.4.4.1 General
Replace the last paragraph with the following paragraph:
SPDs for use in AC circuits shall comply with the requirements of IEC 61643-11.
Add the following new NOTE 2, and renumber the existing NOTE as NOTE 1:
NOTE 2 IEC 61643-41 Low-voltage surge protective devices – Part 41: Surge protective devices connected to DC
low-voltage power systems – Requirements and test methods, is under development.

– 4 – IEC 60364-5-53:2019/AMD2:2024
© IEC 2024
534.4.4.2 Selection of voltage protection level (U ) as a function of equipment rated
p
impulse voltage (U )
W
Replace the first paragraph, including NOTE 1, with the following paragraph:
The voltage protection level U of SPDs between live conductors and protective earthing
p
conductors shall be selected in accordance with the required rated impulse voltage of the
equipment and not exceed the value specified for overvoltage category II in accordance with
IEC 60364-4-44:2024, Table 4.
Replace the fourth paragraph with the following paragraph:
The voltage protection level provided by SPDs should not exceed 80 % of the required rated
impulse voltage of the equipment and the value specified for overvoltage category II in
accordance with IEC 60364-4-44:2024, Table 4.
Renumber the existing NOTE 2 as NOTE and delete the existing Table 1.

© IEC 2024
Insert, after Annex G, the following new Annex H:
Annex H
(informative)
Additional information for the application of DC SPDs
H.1 General
As there is a diversity of voltages used in DC systems, other system parameters may vary over
a wide range depending on the application, equipment and component used.
Owing to the varying parameters of such DC systems, only SPDs especially dedicated to DC
systems should be used. The manufacturer of SPDs should give the relevant information.
IEC 60364-4-44:2024, Clause 442 is applicable only for AC systems. For DC systems, which
are galvanically coupled to an AC system, it is necessary to consider how the potential
temporary overvoltages (TOVs) from the AC system and as specified in IEC 60364-4-44:2024,
Clause 442 are transferred
...