IEC 60364-4-41:2005/AMD1:2017

Amendment 1 - Low voltage electrical installations - Part 4-41: Protection for safety - Protection against electric shock

Amendement 1 - Installations électriques à basse tension - Partie 4-41: Protection pour assurer la sécurité - Protection contre les chocs électriques

General Information

• Status: Published
• Publication Date: 16-Mar-2017
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 13.260 - Protection against electric shock. Live working
• ICS: 31.140 - Piezoelectric devices
• ICS: 91.140.50 - Electricity supply systems
• Technical Committee: TC 64 - Electrical installations and protection against electric shock
• Drafting Committee: MT 9 - TC 64/MT 9
• Current Stage: PPUB - Publication issued
• Start Date: 18-Jan-2017
• Completion Date: 17-Mar-2017

Relations

• Amends: IEC 60364-4-41:2005 - Low-voltage electrical installations - Part 4-41: Protection for safety - Protection against electric shock
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60364-4-41 ®
Edition 5.0 2017-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
G ROUP SAFETY PUBLICATION
PU BLICATION GROUPÉE DE SÉCURITÉ

AMENDMENT 1
AMENDEMENT 1
Low-voltage electrical installations –
Part 4-41: Protection for safety – Protection against electric shock

Installations électriques à basse tension –
Partie 4-41: Protection pour assurer la sécurité – Protection contre les chocs
électriques
IEC 60364-4-41:2005-12/AMD1:2017-03(en-fr)

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IEC 60364-4-41 ®
Edition 5.0 2017-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
G ROUP SAFETY PUBLICATION
PU BLICATION GROUPÉE DE SÉCURITÉ

AMENDMENT 1
AMENDEMENT 1
Low-voltage electrical installations –

Part 4-41: Protection for safety – Protection against electric shock

Installations électriques à basse tension –

Partie 4-41: Protection pour assurer la sécurité – Protection contre les chocs

électriques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.260; 91.140.50 ISBN 978-2-8322-3813-4

– 2 – IEC 60364-4-41:2005/AMD1:2017
 IEC 2017
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
64/2147/FDIS 64/2151/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 website 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.
_____________
410.2 Normative references
Replace the existing reference IEC 60364-5-52 and its footnote by the following entry:
IEC 60364-5-52, Low-voltage electrical installations – Part 5-52: Selection and erection of
electrical equipment – Wiring systems
Replace the existing reference "IEC 60439-1" by the following new entry:
IEC 61439 (all parts), Low-voltage switchgear and controlgear assemblies
Add, after the entry "IEC 61558-2-6" the following new entry:
IEC 62477-1, Safety requirements for power electronic converter systems and equipment –
Part 1: General
411.3.1.2 Protective equipotential bonding
Replace the existing text with the following new text:
In each building, incoming metallic parts which are liable to introduce a dangerous potential
difference and do not form part of the electrical installation shall be connected to the main
earthing terminal by protective bonding conductors; examples of such metallic parts may
include:
 IEC 2017
• pipes supplying services into the building, for example gas, water, district heating
systems;
• structural extraneous-conductive-parts;
• accessible reinforcement of constructional reinforced concrete.
Where such conductive parts originate outside the building, they shall be bonded as close as
practicable to their point of entry within the building.
Metallic pipes entering the building having an insulating section installed at their entrance
need not be connected to the protective equipotential bonding.
NOTE Subclause 542.4.1 of IEC 60364-5-54:2011 lists other connections which are to be made to the main
earthing terminal.
411.3.2.1
Replace the existing text and "NOTES" with the following new text and "NOTE":
411.3.2.1 A protective device shall automatically switch off the supply to the line conductor
of a circuit or equipment in the event of a fault of negligible impedance between the line
conductor and an exposed-conductive-part or a protective conductor in the circuit or
equipment within the disconnection time required in 411.3.2.2, 411.3.2.3 or 411.3.2.4.
The device shall be suitable for isolation of at least the line conductor(s).
NOTE For IT systems, automatic disconnection is not necessarily required on the occurrence of a first fault (see
411.6.1). For the requirements for disconnection in the event of a second fault, occurring on a different live
conductor, see 411.6.3.2 following the rules of this subclause.
411.3.2.2
Replace the existing text and Table 41.1 with the following new text and new Table 41.1:
411.3.2.2 The maximum disconnection times stated in Table 41.1 shall be applied to final
circuits with a rated current not exceeding
• 63 A with one or more socket-outlets, and
• 32 A supplying only fixed connected current-using equipment.
Table 41.1 – Maximum disconnection times
System 50 V < U ≤ 120 V 120 V < U ≤ 230 V 230 V < U ≤ 400 V U > 400 V
o o o o
s s s s
a.c. d.c. a.c. d.c. a.c. d.c. a.c. d.c.
a
TN 0,8 0,4 1 0,2 0,4 0,1 0,1
a
TT 0,3 0,2 0,4 0,07 0,2 0,04 0,1
Where in TT systems the disconnection is achieved by an overcurrent protective device and the protective
equipotential bonding is connected with all extraneous-conductive-parts within the installation, the maximum
disconnection times applicable to TN systems may be used.
U is the nominal a.c. or d.c. line to earth voltage.
o
NOTE Where disconnection is provided by an RCD, see Note to 411.4.4, Note 4 to 411.5.3 and Note 4 to
411.6.4 b).
a
Disconnection may be required for reasons other than protection against electric shock.

– 4 – IEC 60364-4-41:2005/AMD1:2017
 IEC 2017
411.3.2.5
Replace the existing text with the following new text:
Where it is not feasible for an overcurrent protective device to interrupt the supply in
accordance with 411.3.2 or the use of an RCD for this purpose is not appropriate, see
Annex D.
However, disconnection may be required for reasons other than protection against electric
shock.
411.3.3 Additional protection
Replace the existing Subclause 411.3.3, including its title, with the following new title and new
text:
411.3.3 Further requirements for socket-outlets and for the supply of mobile
equipment for use outdoors
Additional protection by means of a residual current protective device (RCD) with a rated
residual operating current not exceeding 30 mA shall be provided for
– a.c. socket-outlets with a rated current not exceeding 32 A that are liable to be used by
ordinary persons and are intended for general use, and
– a.c. mobile equipment for use outdoors with a rated current not exceeding 32A.
This subclause does not apply for IT systems in which the fault current, in the event of a first
fault, does not exceed 15 mA.
NOTE Additional protection in d.c. systems is under consideration.
Add, after the end of 411.3.3, the following new Subclause 411.3.4:
411.3.4 Additional requirements for circuits with luminaires in TN- and TT-systems
In premises designed to accommodate a single household, additional protection by a residual
current protective device (RCD) with a rated residual operating current not exceeding 30 mA
shall be provided for a.c. final circuits supplying luminaires.
411.4.1
Replace the existing “NOTE 1” and “NOTE 2” with the following “NOTE”:
NOTE Examples of conditions include:
• the PEN is connected to earth at a number of points and is installed in such a way as to minimize the risk
arising from a break in the PEN conductor;
• R /R ≤ 50/(U – 50)
B E o
where
R is the earth electrode resistance, in ohms, of all earth electrodes in parallel;
B
R is the minimum contact resistance with earth, in ohms, of extraneous-conductive-parts not connected to a
E
protective conductor, through which a fault between line and earth may occur;
U is the nominal a.c. r.m.s. voltage to earth, in volts.
o
 IEC 2017
411.4.2
Delete the existing "NOTE 1" and replace it with the following paragraph of normal text:
If other effective earth connections exist, it is recommended that the protective conductors
also be connected to such points wherever possible. Earthing at additional points, distributed
as evenly as possible, may be necessary to ensure that the potentials of protective
conductors remain, in case of a fault, as near as possible to that of earth.
Delete the existing "NOTE 2" and replace it with the following paragraph of normal text:
It is recommended that protective conductors (PE and PEN) should be earthed where they
enter any buildings or premises taking account of any diverted neutral currents of multiple
earthed PEN conductors.
411.4.4
Add, in the second item after "where", spaces before "or" (two occurrences) and a semi-colon
instead of a colon at the end as follows:
I is the current in amperes (A) causing the automatic operation of the disconnecting device
a
within the time specified in 4
...