IEC 60364-4-44:2007/AMD1:2015

IEC 60364-4-44 ®
Edition 2.0 2015-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
A MENDMENT 1
AM ENDEMENT 1
Low-voltage electrical installations –
Part 4-44: Protection for safety – Protection against voltage disturbances and
electromagnetic disturbances
Installations électriques à basse tension –
Partie 4-44: Protection pour assurer la sécurité – Protection contre les
perturbations de tension et les perturbations électromagnétiques

IEC 60364-4-44:2007-08/AMD1:2015-09(en-fr)

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IEC 60364-4-44 ®
Edition 2.0 2015-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
A MENDMENT 1
AM ENDEMENT 1
Low-voltage electrical installations –

Part 4-44: Protection for safety – Protection against voltage disturbances and

electromagnetic disturbances
Installations électriques à basse tension –

Partie 4-44: Protection pour assurer la sécurité – Protection contre les

perturbations de tension et les perturbations électromagnétiques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.100.10; 33.100.20; 91.140.50 ISBN 978-2-8322-2882-1

– 2 – IEC 60364-4-44:2007/AMD1:2015
© IEC 2015
FOREWORD
This amendment 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:
FDIS Report on voting
64/2032/FDIS 64/2073/RVD
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the stability date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
_____________
FOREWORD
Add the following new text:
The reader's attention is drawn to the fact that Annex C lists all of the “in-some-country”
clauses on differing practices of a less permanent nature relating to the subject of this
standard.
440.2 Normative references
Replace the date of IEC 60038 from "1983" to "2009".
Add the following new references:
IEC 60364-5-53:2001, Electrical installations of buildings - Part 5-53: Selection and erection
of electrical equipment - Isolation, switching and control
IEC 60364-5-53:2001/AMD1:2002
IEC 60364-5-53:2001/AMD2:2015
© IEC 2015
IEC 61643-11:2011, Low-voltage surge protective devices – Part 11: Surge protective devices
connected to low-voltage power systems – Requirements and test methods
IEC 61643-22, Low-voltage surge protective devices – Part 22: Surge protective devices
connected to telecommunications and signalling networks – Selection and application
principles
IEC 62305 (all parts), Protection against lightning
443 Protection against overvoltages of atmospheric origin or due to switching
Replace the existing Clause 443, including its title, by the following new title and text:
443 Protection against transient overvoltages of atmospheric origin or due to
switching
443.1 General
Clause 443 specifies requirements for protection of electrical installations against transient
overvoltages of atmospheric origin transmitted by the supply distribution system including
direct strikes to the supply system and against switching overvoltages. Clause 443 does not
specify requirements for protection against transient overvoltage due to direct or nearby
lightning strokes on the structure.
NOTE 1 For risk management for protection against transient overvoltage due to direct or nearby lightning strokes
on the structure, see IEC 62305-2.
In general, switching overvoltages have lower amplitude than transient overvoltages of
atmospheric origin and therefore the requirements regarding protection against transient
overvoltages of atmospheric origin normally cover protection against switching overvoltages.
If no transient overvoltage protection against disturbances of atmospheric origin is installed,
protection against switching overvoltages may need to be provided.
NOTE 2 Overvoltages due to switching can be longer in duration and can contain more energy than the transient
overvoltages of atmospheric origin. See 443.4.
The characteristics of transient overvoltages of atmospheric origin depend on factors such as:
– the nature of the supply distribution system (underground or overhead);
– the possible existence of at least one surge protective device (SPD) upstream of the origin
of the installation;
– the voltage level of the supply system.
NOTE 3 As regards transient overvoltages of atmospheric origin, no distinction is made between earthed and
unearthed systems.
Protection against transient overvoltages is provided by the installation of surge protective
devices (SPDs).
Selection and installation of SPDs shall be in compliance with Clause 534 of
IEC 60364-5-53:2001, IEC 60364-5-53:2001/AMD1:2002 and IEC 60364-5-53/AMD2:2015.
If there is a need for SPDs on the power supply lines, additional SPDs on other Iines such as
telecom lines are also recommended.
Requirements for protection against transient overvoltages transmitted by data transmission
systems are not covered by Clause 443. See IEC 61643-22.

– 4 – IEC 60364-4-44:2007/AMD1:2015
© IEC 2015
Clause 443 does not apply to installations where the consequences caused by overvoltages
affect:
a) structures with risk of explosion;
b) structures where the damage may also involve the environment (e.g. chemical or
radioactive emissions).
443.2 Void
443.3 Terms and definitions
443.3.1
urban environment
area with a high density of buildings or densely populated communities with tall buildings
Note 1 to entry: A town centre is an example of an urban environment.
443.3.2
suburban environment
area with a medium density of buildings
Note 1 to entry: Town outskirts are an example of a suburban environment.
443.3.3
rural environment
area with a low density of buildings
Note 1 to entry: The countryside is an example of a rural environment.
443.3.4
surge protective device
SPD
device that contains at least one non-linear component that is intended to limit surge voltages
and divert surge currents
Note 1 to entry: An SPD is a complete assembly, having appropriate connecting means.
Note 2 to entry: This note applies to the French language only.
[SOURCE: IEC 61643-11:2011, 3.1.1]
443.3.5
calculated risk level
CRL
calculated value of risk used to evaluate the need for transient overvoltage protection
Note 1 to entry: This note applies to the French language only.
443.3.6
rated impulse voltage
U
W
impulse withstand voltage value assigned by the manufacturer to the equipment or to a part of
it, characterizing the specified withstand capability of its insulation against transient
overvoltages.
[SOURCE: IEC 60664-1:2007, 3.9.2, Modified — symbol added]
443.4 Overvoltage control
Protection against transient overvoltage shall be provided where the consequence caused by
overvoltage affects:
© IEC 2015
a) human life, e.g. safety services, medical care facilities;
b) public services and cultural heritage, e.g. loss of public services, IT centres, museums;
c) commercial or industrial activity, e.g. hotels, banks, industries, commercial markets,
farms.
For all other cases, a risk assessment according to 443.5 shall be performed in order to
determine if protection against transient overvoltage is required. If the risk assessment is not
performed, the electrical installation shall be provided with protection against transient
overvoltage.
However the transient overvoltage protection is not required for single dwelling units where
the total economic value of the electrical installation to be protected is less than 5 times the
economic value of the SPD located at the origin of the installation.
NOTE 1 National Committees can modify the exception criteria related to single dwelling units or to not apply it.
Protection against switching overvoltages should be considered in the case of equipment
likely to produce switching overvoltages or disturbances exceeding the values according to
the overvoltage category of the installation e.g. where a LV generator supply the installation
or where inductive or capacitive loads (e.
...