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

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• withdrawn,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 411.3.2.2, or 411.3.2.3. When a residual current protective
device (RCD) is used this current is the residual operating current providing disconnection
in the time specified in 411.3.2.2, or 411.3.2.3;
Replace the existing "NOTE" with the following new "NOTE":
NOTE In TN systems the residual fault currents are significantly higher than 5 I . Therefore, the disconnection
Δn
times in accordance with Table 41.1 are fulfilled where residual current protective devices (RCDs) according to
IEC 61008-1, IEC 61009-1 or IEC 62423, including selective and time delayed types, are installed. Circuit-breakers
providing residual current protection (CBR) and MRCDs according to IEC 60947-2 can be used, provided the time
delay is adjusted to afford compliance with Table 41.1.
411.4.5
Delete, before the existing "NOTE 2", the existing paragraph "Where an RCD is used in a
TN-C-S system, a PEN conductor shall not be used on the load side. The connection of the
protective conductor to the PEN conductor shall be made on the source side of the RCD".
411.5.2
Add, in the first paragraph, second sentence after Z , "(see 411.5.4)", as follows:
s
…. low value of Z (see 411.5.4) is permanently and reliably assured.
s
411.5.4
Replace, in the first paragraph, the existing word "over-current" by "overcurrent".
411.6.2
Replace the existing second paragraph with the following new text:
In a.c. systems the following condition shall be fulfilled to limit the touch voltage to:
R × I ≤ 50 V
A d
– 6 – IEC 60364-4-41:2005/AMD1:2017
 IEC 2017
where
R is the sum of the resistance in Ω of the earth electrode and protective conductor for the
A
exposed-conductive-parts;
I is the fault current in A of the first fault of negligible impedance between a line
d
conductor and an exposed-conductive-part. The value of I takes account of leakage
d
currents and the total earthing impedance of the electrical installation.
Add, at the end of the subclause, the following new "NOTE":
NOTE No touch voltage limitation is considered in d.c. systems as the value of I can be considered to be
d
negligibly low.
411.6.3
Add, “(IFLS)” at the end of the third indent, so that the indent reads:
– insulation fault location systems (IFLS);
Replace the existing "NOTE" by a new "NOTE 1" and add a new "NOTE 2" as follows:
NOTE 1 Where a residual current protective device (RCD) is used, tripping of the RCD in the event of a first fault
cannot be excluded due to capacitive leakage currents.
NOTE 2 In case of faults in two different items of class I current-using equipment supplied by different line
conductors, the operation of a residual current protective device (RCD) is only likely to be achieved if every single
item of current using equipment is protected by an individual residual protective device (RCD). The use of
overcurrent protective devices to provide fault protection is also suitable.
411.6.3.1
Replace the existing text with the following new text:
Where an IT system is designed not to disconnect in the event of first fault, the occurrence of
the first fault shall be indicated by either:
– an insulation monitoring device (IMD), which may be combined with an insulation fault
location system (IFLS), or
– a residual current monitor (RCM), provided the residual current is sufficiently high to be
detected.
NOTE RCMs are not able to detect symmetrical insulation faults.
The device shall initiate an audible and/or visual signal which shall continue as long as the
fault persists. The signal can be initiated via a relay contact output, an electronic switching
output or a communication protocol.
A visual and/or an audible alarm system shall be arranged at a suitable place, so that it is
perceived by responsible persons.
If there are both audible and visible signals, it is permissible for the audible signal to be
cancelled.
It is recommended that a first fault be eliminated with the shortest practicable delay.
In addition, an insulation fault location system (IFLS) according to IEC 61557-9 may be
provided to indicate the location of a first fault from a live part to exposed-conductive-parts or
earth or another reference point.

 IEC 2017
411.6.3.2
Delete the entire text and subclause number of 411.6.3.2.
412.1.1
Add the following new paragraph after the “NOTE”:
The protective measure by double or reinforced insulation is applicable in all situations,
unless some limitations are given in the corresponding Part 7 of IEC 60364.
412.1.2
Replace the existing text with the following new text:
Where this protective measure is to be used as the sole protective measure (i.e. where a
whole installation or circuit is intended to consist entirely of equipment with double insulation
or reinforced insulation), it shall be verified that effective measures, for example by adequate
supervision, are in place so that no change can be made that would impair the effectiveness
of the protective measure.
Therefore this protective measure shall not be applied to any circuit that includes, for
example, a socket-outlet with an earthing contact.
412.1.3
Delete the entire text and subclause number of 412.1.3.
412.2.1.1
Replace, in the second indent, "(see IEC 60439-1)" by "(see the IEC 61439 series)".
Replace the existing "NOTE" with the following new "NOTE":
NOTE This equipment is identified by the symbol IEC 60417-5172:2003-02.
412.2.1.2
Replace the existing “NOTE” with the following new paragraph.
The symbol should be fixed in a visible position on the exterior and interior of the
enclosure. See IEC 60417-5019:2006-08 and IEC 80416-3:2002, Clause 7.
412.2.1.3
Replace the existing “NOTE” with the following new paragraph.
The symbol should be fixed in a visible position on the exterior and interior of the
enclosure. See IEC 60417-5019:2006-08 and IEC 80416-3:2002, Clause 7.
412.2.3.2
Replace, in the first paragraph, the existing reference to "412.1.3" by "412.1.2".

– 8 – IEC 60364-4-41:2005/AMD1:2017
 IEC 2017
412.2.4.1
Replace the existing text with the following new text:
Wiring systems installed in accordance with IEC 60364-5-52 are considered to meet the
requirements of 412.2 if they consist of:
a) conductors having insulation with a rated voltage not less than the nominal voltage of the
system and at least 300 V to 500 V, enclosed in trunking or ducting with electrical
insulating characteristics complying with the IEC 61084 series, or conduit with electrical
insulating characteristics complying with the IEC 61386 series, or
b) cable adequate to withstand electric, thermal, mechanical and environmental stresses with
the same reliability of protection as provided by double insulation.
NOTE 1 Such wiring systems are not identified by the symbol IEC 60417-5172:2003-02, or by the symbol
IEC 60417-5019:2006-08 and IEC 80416-3:2002, Clause 7.
NOTE 2 In Italy, wiring systems installed in accordance with IEC 60364-5-52 in electrical systems with nominal
voltages not higher than 690 V, are considered to meet the requirements of 412.2 if the following cables or
insulated conductors are used:
• cables, provided with a non-metallic sheath, having a rated voltage one step higher than the nominal voltage of
the system; or
• insulated conductors installed in insulating conduits or insulating trunkings complying with the relevant
standards; or
• cables, provided with a metallic sheath, having between the conductors and the metallic sheath and between
such metallic sheath and the external surface, an insulation adequate for the nominal voltage of the electrical
system.
415.2.2
Replace the existing first paragraph with the following new text:
The resistance R between simultaneously accessible exposed-conductive-parts and
extraneous-conductive-parts shall fulfil the following condition:
C.3.8
Replace, in the existing text "100 000 V/m" by "100 000".
Annex D – Correspondence between IEC 60364-4-41:2001 and the present
standard
Replace the existing Annex D, including its title, with the following new Annex D and new title:

 IEC 2017
Annex D
(normative)
Provisions where automatic disconnection
according to 411.3.2 is not feasible
D.1 Where automatic disconnection is not feasible in circumstances where
• electronic equipment with limited short-circuit current is installed, or
• the required disconnection times cannot be achieved by a protective device,
the following provisions are applicable.
D.2 For installations with power electronic converters with nominal voltage U greater than
o
50 V a.c. or 120 V d.c. and where automatic disconnection is not feasible, the output voltage
of the source shall be reduced to 50 V a.c. or 120 V d.c. or less in the event of a fault
between a live conductor and the protective conductor or earth in a time as given in 411.3.2.2,
411.3.2.3 or 411.3.2.4, as appropriate (see IEC 62477-1).
The power electronic converter shall be one for which the manufacturer gives adequate
methods for the initial and periodic verification of the installation.
D.3 Except where D.1 applies, if automatic disconnection cannot be achieved in the time
required by 411.3.2.2, 411.3.2.3, or 411.3.2.4 as appropriate, supplementary protective
equipotential bonding shall be provided in accordance with 415.2 and the voltage between
simultaneously accessible conductive parts shall not exceed 50 V a.c. or 120 V d.c.

– 10 – IEC 60364-4-41:2005/AMD1:2017
 IEC 2017
Annex E
(informative)
List of notes concerning certain countries

Country Clause Nature Rationale Wording
N° (permanent or (detailed
less permanent justification
according to for the requested
IEC Directives) country note)
IE 410.3  In Ireland, the protective measure “Protection
by Reduced Low Voltage”(i.e. 120V a.c. with
centre-point earthing) is a statutory requirement
in certain places of work
BE 411.3.2.2  In Belgium, the maximum discontinuation time is
not applicable; the Belgian safety curve as
given in the Belgian Wiring Rules needs to be
followed.
NL 411.3.2.2  In the Netherlands the maximum disconnection
time stated in Table 41.1 is applied to all
circuits not exceeding 32 A and all circuits
supplying socket-outlets.
GB 411.3.3  In the United Kingdom additional protection by
means of an RCD is required to be provided for:
(i) socket-outlets with a rated current not
exceeding 20 A, and
(ii) mobile equipment with a current rating not
exceeding 32 A for use outdoors.
IE 411.3.3  In Ireland additional protection is provided for
socket-outlets with a rated current up to 32 A
intended for use by ordinary persons.
BE 411.3.3  In Belgium, every electrical installation under
the supervision of ordinary persons must be
protected by a RCD with a rated operating
residual current not exceeding 300 mA. For
circuits supplying bathrooms, washing
machines, dishwashers, etc, an additional
protection by means of a RCD with a rated
residual operating current not exceeding 30 mA
is mandatory. The above is valid for electrical
installations whose earthing resistance is lower
than 30 Ω. In case of earthing resistance higher
than 30 Ω and lower than 100 Ω, additional
RCDs with a rated operating residual current not
exceeding 100 mA should be provided. An
earthing resistance higher than 100 Ω is not
permitted.
NO 411.3.3  In Norway all commercial and industrial
companies are covered by regulations requiring
procedures for qualifications and training of
employees. Except for areas open for the
public, socket-outlets in such locations are
normally not considered to be for general use of
ordinary people. Socket-outlets in dwellings and
BA2 locations are intended for general use by
ordinary people.
BE 411.3.4  In Belgium, this requirement is not applicable.
DE 411.4.1  In Germany, it is mandatory for DSOs to fulfil
the conditions of the formula given in the Note.
DE  In Germany, every new building shall have a
foundation earth electrode, erected in
accordance with DIN 18014.
AT  In Austria, in a TN system every installation
shall have an earth electrode. In Austria a

 IEC 2017
Country Clause Nature Rationale Wording
N° (permanent or (detailed
less permanent justification
according to for the requested
IEC Directives) country note)
foundation earth electrode shall be erected
according OVE/ÖNORM E 8014
CH  In Switzerland a foundation earth electrode shall
be erected according to SNR 464113.
IT 411.5.2  In Italy, in case of TT systems, only RCDs shall
be used for fault protection.
AT 411.3.2.2 permanent long practical In Austria TT-systems for nominal voltages to
experiences and earth U exceeding 230 V are not permitted.
o
research results Therefore the values of column 6 to 10 in line 4
are not applicable.
AT 411.3.3 permanent long practical In Austria 411.3.3 and 411.3.4 are not valid.
and experiences and
411.3.4 results of field
investigations in
several countries in
Europe and USA.
IT 412.2.4.1  In Italy, wiring systems installed in accordance
with IEC 60364-5-52 in electrical systems with
nominal voltages not higher than 690 V, are
considered to meet the requirements of 412.2 if
the following cables or insulated conductors are
used:
• cables, provided with a non-metallic sheath,
having a rated voltage one step higher than
the nominal voltage of the system; or
• insulated conductors installed in insulating
conduits or insulating trunkings complying
with the relevant standards; or
• cables, provided with a metallic sheath,
having between the conductors and the
metallic sheath and between such metallic
sheath and the external surface, an
insulation adequate for the nominal voltage
of the electrical system.
AT, DE 413.1.3  In Austria, Germany and Switzerland the
and CH following applies as an alternative measure.
The connection of more than one item of current
using equipment supplied from one unearthed
source is also permitted, if the requirements of
413.2 and 413.3 are met and in addition the
following conditions are fulfilled.
a) The requirements of C.3.3, C.3.6 and C.3.8
shall be met.
b) The source shall be either a single
generator or an isolating transformer in
accordance with IEC 61558-2-4. For motor-
generators an equivalent degree of safety
shall be met.
c) The exposed-conductive-parts of the
separated circuit(s) shall be connected
together by insulated equipotential
conductors which need not to be earthed.
For that purpose, the green-yellow marked
conductor of used cables and the protective
contact of the socket-outlets may be used.
d) An insulation monitoring device (IMD) shall
be installed. If the insulation resistance
between active parts and the insulated
equipotential bonding conductor falls below
100 Ω /V of the nominal voltage, the
circuit(s) of the current-using equipment
shall be disconnected automatically within

– 12 – IEC 60364-4-41:2005/AMD1:2017
 IEC 2017
Country Clause Nature Rationale Wording
N° (permanent or (detailed
less permanent justification
according to for the requested
IEC Directives) country note)
the shortest practicable time by a switching
element suitable for isolation according to
IEC 60364-5-53:2001, 536. The insulation
monitoring device (IMD) shall fulfil the
requirements of IEC 61557-8 and the
response time shall be verified in
accordance with IEC 61557-8.
The shortest practicable time depends on
the measurement principle of the insulation
monitoring device (IMD) together with the
system leakage capacitance.
e) In cases of conductive environment and
touchable extraneous conductive parts at
the location of use the equipment, a local
interconnection with the exposed-
conductive-parts of current-using equipment
is recommended.
CH 413.1.3  In Switzerland the following applies as an
alternative measure.
The connection of more than one item of current
using equipment supplied from one unearthed
source is also permitted, if the requirements of
413.2 and 413.3 are met and in addition the
following conditions are fulfilled.
a) The requirements of C.3.3, C.3.6 and C.3.8
shall be met.
b) The source shall be either a single
generator or an isolating transformer in
accordance with IEC 61558-2-4. For motor-
generators an equivalent degree of safety
shall be met.
c) The exposed-conductive-parts of the
separated circuit(s) shall be connected
together by insulated equipotential
conductors which need not to be earthed.
For that purpose, the green-yellow marked
conductor of used cables and the protective
contact of the socket-outlets may be used.
d) An insulation monitoring device (IMD) shall
be installed. If the insulation resistance
between active parts and the insulated
equipotential bonding conductor falls below
100 Ω/V of the nominal voltage, the
circuit(s) of the current-using equipment
shall be disconnected automatically within
the shortest practicable time by a switching
element suitable for isolation according to
IEC 60364-5-53:2001, Clause 536. The
insulation monitoring device (IMD) shall
fulfil the requirements of IEC 61557-8 and
the response time shall be verified in
accordance with IEC 61557-8.
The shortest practicable time depends on
the measurement principle of the insulation
monitoring device (IMD) together with the
system leakage capacitance.
e) In cases of conductive environment and
touchable extraneous conductive parts at
the location of use of the equipment, a local
interconnection with the exposed-
conductive-parts of current-using
equipment is recommended.
AT 415, permanent long practical In Austria the text is replaced by:
415.1 experiences and
 IEC 2017
Country Clause Nature Rationale Wording
N° (permanent or (detailed
less permanent justification
according to for the requested
IEC Directives) country note)
and results of field 415 Additional protection
415.1.1 investigations in
Additional protection may be required
several countries in
together with the protective measure
Europe and USA.
under certain conditions of external
influence and for certain locations
(see Part 7 of IEC 60364).
415.1 Additional protection: residual current
protective devices (RCD) in a.c.
systems.
415.1.1 In TT- and TN-Systems systems
residual current protective devices
(RCD) with a residual operating
current not exceeding 30 mA shall be
provided for:
– final circuits with socket outlets with a rated
current not exceeding 20 A;
– final circuits for mobile equipment for use
outdoors with a rated current not exceeding
32 A.
An exemption may be made for:
– final circuits with a sole socket outlet
provided for connection of particular fixed
equipment not intended and not accessible
for general use. These socket outlets shall
be marked clearly and durable;
– final circuits in industrial or commercial
installations provided with socket outlets for
connection of particular fixed equipment, to
facilitate maintenance and repair, not
intended and not accessible for general
use. These socket outlets shall be marked
clearly and durable.
NOTE The use of RCDs with a rated residual
operating current not exceeding 30 mA, is
recognized in a.c. systems as additional
protection in the event of failure of the provision
for basic protection (protection against direct
contact) and/or the provision for fault protection
(protection against indirect contact) or
carelessness by users.
– 14 – IEC 60364-4-41:2005/AMD1:2017
 IEC 2017
Bibliography
Replace the existing reference to IEC 60417-DB-12M by the following new reference:
IEC 60417, Graphical symbols for use on equipment (available at http://www.graphical-
symbols.info/equipment)
Add the following new references:
IEC 60947-2, Low-voltage switchgear and controlgear – Part 2: Circuit-breakers
IEC 61558-2-4, Safety of transformers, reactors, power supply units and similar products for
supply voltages up to 1 100 V – Part 2-4: Particular requirements and tests for isolating
transformers and power supply units incorporating isolating transformers
IEC 62423, Type F and type B residual current operated circuit-breakers with and without
integral overcurrent protection for household and similar uses
IEC 80416-3, Basic principles for graphical symbols for use on equipment – Part 3:
Guidelines for the application of graphical symbols

___________
– 16 – IEC 60364-4-41:2005/AMD1:2017
 IEC 2017
AVANT-PROPOS
Le présent amendement a été établi par le comité d'études 64 de l'IEC: Installations
électriques et protection contre les chocs électriques.
Le texte de cet amendement est issu des documents suivants:
FDIS Rapport de vote
64/2147/FDIS 64/2151/RVD
Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant
abouti à l'approbation de cet amendement.
Le comité a décidé que le contenu de cet amendement et de la publication de base ne sera
pas modifié avant la date de stabilité indiquée sur le site web de l'IEC sous
"http://webstore.iec.ch" dans les données relatives à la publication recherchée. À cette date,
la publication sera
• reconduite,
• supprimée,
• remplacée par une édition révisée, ou
• amendée.
_____________
410.2 Référence normative
Remplacer la référence "IEC 60364-5-52" et sa note de bas de page par la référence
suivante:
IEC 60364-5-52, Installations électriques à basse tension – Partie 5-52: Choix et mise en
œuvre des matériels électriques – Canalisations
Remplacer la référence "IEC 60439-1" existante par la nouvelle référence suivante:
IEC 61439 (toutes les parties), Ensembles d'appareillage à basse tension
Ajouter après la référence "IEC 61558-2-6" la nouvelle référence suivante:
IEC 62477-1, Exigences de sécurité applicables aux systèmes et matériels électroniques de
conversion de puissance – Partie 1: Généralités
411.3.1.2 Liaison équipotentielle de protection
Remplacer le texte existant par le nouveau texte suivant:
Dans chaque bâtiment, les parties métalliques entrantes susceptibles d’introduire une
différence de potentiel dangereuse et ne faisant pas partie de l’installation électrique doivent
être connectées à la borne principale de terre par des conducteurs de liaison de protection;
les parties métalliques peuvent être par exemple:

 IEC 2017
• les canalisations d'alimentation à l'intérieur du bâtiment, par exemple gaz, eau,
installations de chauffage central;
• les éléments conducteurs étrangers de la structure;
• le renfort accessible de la construction en béton armé.
Lorsque de tels éléments conducteurs proviennent de l'extérieur du bâtiment, ils doivent être
reliés aussi près que possible de leur point d'entrée dans le bâtiment.
Il n’est pas nécessaire de connecter à la liaison équipotentielle de protection les canalisations
d'alimentation métalliques entrant dans le bâtiment présentant une section isolante à l’entrée.
NOTE Le paragraphe 542.4.1 de l'IEC 60364-5-54:2011 énumère d'autres connexions qui doivent être réalisées à
la borne principale de terre.
411.3.2.1
Remplacer le texte et les "NOTES" existants par les nouveaux texte et "NOTE" suivants:
411.3.2.1 Un dispositif de protection doit couper automatiquement l’alimentation au
conducteur de phase d’un circuit ou d’un matériel en cas de défaut d’impédance négligeable
entre le conducteur de phase et une masse ou un conducteur de protection dans le circuit ou
le matériel dans le temps de coupure exigé en 411.3.2.2, 411.3.2.3 ou 411.3.2.4.
Le dispositif doit être adapté au sectionnement au moins du ou des conducteurs de phase.
NOTE En schéma IT, la coupure automatique n'est pas nécessairement exigée lors d'un premier défaut (voir
411.6.1). Pour les exigences concernant la coupure dans l’éventualité d’un deuxième défaut, dans un autre
conducteur actif, voir 411.6.3.2 en suivant les règles de ce paragraphe.
411.3.2.2
Remplacer le texte et le Tableau 41.1 existants par les nouveaux texte et Tableau 41.1
suivants:
411.3.2.2 Les temps de coupure maximaux indiqués dans le Tableau 41.1 doivent être
appliqués aux circuits terminaux avec une valeur maximale de courant assigné de
• 63 A avec un ou plusieurs socles de prise de courant, et
• 32 A alimentant uniquement un matériel d’utilisation connecté fixe.
Tableau 41.1 – Temps de coupure maximaux
Schéma
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
Courant Courant Courant Courant Courant Courant Courant Courant
alternatif continu alternatif continu alternatif continu alternatif continu
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
Si en schéma TT, la coupure est effectuée par un dispositif de protection contre les surintensités et la liaison
équipotentielle de protection est connectée à tous les éléments conducteurs étrangers dans l’installation, les
temps de coupure maximaux des schémas TN peuvent être applicables.
U est la tension nominale phase-terre, en courant alternatif ou en courant continu.
o
NOTE Si la coupure est réalisée par DDR, voir la Note de 411.4.4, la Note 4 de 411.5.3 et la Note 4 de
411.6.4 b).
a
Une coupure peut être exigée pour des raisons autres que la protection contre les chocs électriques.

– 18 – IEC 60364-4-41:2005/AMD1:2017
 IEC 2017
411.3.2.5
Remplacer le texte existant par le nouveau texte suivant:
Si un dispositif de protection contre les surintensités n’est pas en mesure de couper
l’alimentation selon 411.3.2 ou si l’utilisation d’un DDR à ces fins n’est pas adaptée, voir
l’Annexe D.
Néanmoins, une coupure peut être exigée pour des raisons autres que la protection contre les
chocs électriques.
411.3.3 Protection complémentaire
Remplacer le Paragraphe 411.3.3 existant, y compris son titre, par le nouveau titre et le
nouveau texte suivants:
411.3.3 Autres exigences pour les socles de prise de courant et pour l’alimentation
des appareils portatifs destinés à être utilisés à l’extérieur
Une protection complémentaire au moyen d'un dispositif de protection à courant différentiel
résiduel (DDR) assigné au plus égal à 30 mA doit être prévue pour:
– les socles de prise de courant en courant alternatif de courant assigné au plus égal à
32 A, susceptibles d'être utilisés par des personnes ordinaires pour un usage général, et
– les appareils portatifs en courant alternatif destinés à être utilisés à l’extérieur de courant
assigné au plus égal à 32 A.
Cet article ne s'applique pas aux schémas IT dans lesquels le courant de défaut, en cas de
premier défaut, ne dépasse pas 15 mA.
NOTE Une protection complémentaire dans les réseaux à courant continu est à l’étude.
Ajouter, à la fin de 411.3.3, le nouveau Paragraphe 411.3.4 suivant:
411.3.4 Exigences supplémentaires pour les circuits avec des luminaires en schémas
TN et TT
Dans les locaux conçus pour loger un seul foyer, une protection complémentaire au moyen
d'un dispositif de protection à courant différentiel résiduel (DDR) assigné au plus égal à
30 mA doit être prévue pour les circuits terminaux en courant alternatif alimentant des
luminaires.
411.4.1
Remplacer la “NOTE 1” et la “NOTE 2” existantes par la “NOTE” suivante:
NOTE Des exemples de ces conditions sont les suivants:
• le conducteur PEN est relié à la terre en de multiples points et est mis en œuvre de manière à minimiser le
risque que représente une rupture de ce conducteur;
• R /R ≤ 50/(U – 50)
B E o
où
R est la résistance de toutes les prises de terre en parallèle, en ohms;
B
R est la résistance minimale de contact des éléments conducteurs étrangers non connectés à un conducteur
E
de protection, à travers lesquels un courant de défaut phase-terre peut s’écouler, en ohms;
U est la tension nominale du courant alternatif (valeur efficace) à la terre, en volts.
o
 IEC 2017
411.4.2
Supprimer la "NOTE 1" existante et la remplacer par l'alinéa suivant:
S'il existe d’autres possibilités efficaces de mise à la terre, il est recommandé de relier le
conducteur de protection en autant de points que possible. Une mise à la terre multiple, en
des points régulièrement répartis, peut être nécessaire pour s'assurer que le potentiel du
conducteur de protection demeure, en cas de défaut, aussi proche que possible de celui de la
terre.
Supprimer la "NOTE 2" existante et la remplacer par l'alinéa suivant:
Il est recommandé de relier les conducteurs de protection (PE et PEN) à la terre à leur point
d'entrée d'un bâtiment ou établissement, en tenant compte de tout courant de point neutre
dévié de conducteurs PEN mis à la terre en des points multiples.
411.4.4
La modification s'applique à la version anglaise seulement.
Remplacer la "NOTE" existante par la nouvelle "NOTE" suivante:
NOTE En schéma TN, les courants de défaut différentiels résiduels sont significativement plus élevés que 5 I .
Δn
Les temps de coupure selon le Tableau 41.1 sont donc respectés avec des dispositifs de protection à coura
...