IEC 63404:2024

IEC 63404 ®
Edition 1.0 2024-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Switchgear and controlgear and their assemblies for low voltage – Integration of
radiocommunication device above 380 MHz into an equipment

Appareillages et ensembles d'appareillages à basse tension – Intégration d'un
dispositif de radiocommunication de plus de 380 MHz à un équipement

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IEC 63404 ®
Edition 1.0 2024-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Switchgear and controlgear and their assemblies for low voltage – Integration of

radiocommunication device above 380 MHz into an equipment

Appareillages et ensembles d'appareillages à basse tension – Intégration d'un

dispositif de radiocommunication de plus de 380 MHz à un équipement

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.20  ISBN 978-2-8322-8281-6

– 2 – IEC 63404:2024 © IEC 2024
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Implementation categories . 10
5 Characteristics . 13
5.1 Radiocommunication . 13
5.2 Radiocommunication device interfaces . 13
5.3 Radiofrequency capability profile of the host equipment . 14
6 Product information and marking . 15
6.1 General . 15
6.2 Identification . 15
6.3 Characteristics . 15
6.4 Instruction for the upgrade of the radiocommunication device . 15
7 Normal service, mounting and transport conditions . 16
8 Constructional and performance requirements . 16
8.1 General . 16
8.2 Constructional . 16
8.2.1 Upgrade of the radiocommunication device . 16
8.2.2 Addition of an antenna port . 17
8.2.3 Electromagnetic field . 17
8.3 Radio communication performance . 17
8.4 EMC . 17
8.4.1 Radiocommunication . 17
8.4.2 Radiofrequency capability profile . 18
8.4.3 Addition or withdrawal of antenna port . 18
9 Tests . 18
9.1 Capability profile test procedure . 18
9.2 Evaluation procedure for assemblies . 19
9.3 Constructional . 19
9.3.1 Upgrade of the radiocommunication device . 19
9.3.2 Electromagnetic field . 19
9.4 Performance . 19
9.4.1 EMC immunity performance criteria . 19
9.4.2 Radiocommunication performance . 20
9.5 EMC . 21
9.5.1 Radiated emissions . 21
9.5.2 Conducted emissions . 21
9.5.3 Immunity . 22
Annex A (informative) Radiocommunication device integration use cases . 23
A.1 General . 23
A.2 Use case A – Wireless & battery-less position switch . 23
A.3 Use case B – Proximity switch according to IEC 60947-5-2 with external
voltage supply or integrated battery and integrated universal radio module
and antenna . 25

A.4 Use case C – Circuit-breaker with an embedded radiocommunication device
for wireless interface . 28
A.5 Use case D – Upgrade of a low-voltage assembly to become an intelligent
assembly . 29
Annex B (informative) Example of radiocommunication devices . 31
Annex C (informative) Guidance on additional aspects to be considered in product
standards . 32
C.1 General . 32
C.2 Configuration . 32
C.3 Information to be provided with the equipment . 32
C.4 Integration . 32
C.4.1 General . 32
C.4.2 Constructional . 32
C.4.3 Performance . 33
C.4.4 Electromagnetic compatibility . 33
C.4.5 Coexistence management and electromagnetic environment . 33
C.4.6 Embedded software . 34
C.4.7 Security aspects . 34
C.4.8 Routine and sampling tests . 34
Bibliography . 35

Figure 1 – Example of radiocommunication implementation category 1 . 11
Figure 2 – Example of radiocommunication implementation category 1 with distributed
embedded software . 11
Figure 3 – Example of radiocommunication implementation category 2 . 11
Figure 4 – Example of radiocommunication implementation category 2 on two printed
circuit boards . 12
Figure 5 – Example of radiocommunication implementation category 3 . 12
Figure 6 – Example of radiocommunication implementation category 4 . 12
Figure 7 – Examples of radiofrequency capability profile . 14
Figure 8 – Example of transmit mask . 21
Figure B.1 – Example of integration of a radiocommunication device into a wireless
communication interface . 31

Table 1 – Performance criterion . 20

– 4 – IEC 63404:2024 © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SWITCHGEAR AND CONTROLGEAR AND
THEIR ASSEMBLIES FOR LOW VOLTAGE – INTEGRATION OF
RADIOCOMMUNICATION DEVICE ABOVE 380 MHZ INTO AN EQUIPMENT

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 63404 has been prepared by IEC technical committee 121: Switchgear and controlgear and
their assemblies for low voltage. It is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
121/151/FDIS 121/158/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard 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.
IMPORTANT – The "colour inside" logo on the cover page of this document 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.

– 6 – IEC 63404:2024 © IEC 2024
INTRODUCTION
In the context of the fast evolution of radiocommunication technologies and the long lifetime of
low voltage equipment, this document proposes the evaluation and verification of the initial
integration and update of radiocommunication devices within host equipment, including the
hardware or the software.
The aim of this document is to define the tasks of testing the host equipment when integrating
and updating the radiocommunication device into low voltage equipment (e.g. circuit-breaker,
sensor, electric actuator, etc.). In general, this document gives requirements for components
hosting a radiocommunication device in order to facilitate their integration into an assembly.
This document is intended to be referenced by product standards as common
radiocommunication requirements (see Annex C).
The test program has been elaborated based on the result of actual IEC 61000-4-39 testing by
equipment manufacturers and test laboratories. This test allows the characterisation of
radiofrequency band(s) and amplitude(s) which is called a capability profile. This capability
profile can be used to demonstrate the capability of an equipment to host various
radiocommunication devices when their characteristics are within the limits given by the
capability profile.
The integration of a pre-evaluated radiocommunication device according to its radiotechnology
standard into a host equipment can affect its radio transmitter performances. This document
includes the verification of the radiocommunication functions after integration following the main
guidance from ETSI EG 203 367, FCC KDB 996369 D04, MIIT No.129:2021 and
GRFC N 07-20-03-001:2007.
SWITCHGEAR AND CONTROLGEAR AND
THEIR ASSEMBLIES FOR LOW VOLTAGE – INTEGRATION OF
RADIOCOMMUNICATION DEVICE ABOVE 380 MHZ INTO AN EQUIPMENT

1 Scope
This document defines radiocommunication related requirements for equipment intended to
integrate a radiocommunication device. It includes the initial integration and update of a the
radiocommunication device, having a carrier frequency greater than 380 MHz, into new or
updated host equipment with:
– The classification of integration categories;
– The EMC immunity verification using a capability profile approach;
– The verification of the unwanted emission level of the radio transceiver.
This document also provides typical radiocommunication device integration use cases (see
Annex A).
The object of this document is to define the required evaluation when incorporating a
radiocommunication device into a new or updated host equipment.
This document is intended to be referred by the product standard of the host equipment for
providing additional characteristics, performance, and evaluation regarding the integration and
update of a radiocommunication device (see Annex C). It can also be used by the manufacturer
of the host equipment when no applicable product standard exists.
In addition, this document provides guidance on considerations to be addressed in product
standards including safety and security matter.
This document does not cover:
– The test of the radiocommunication device according to its radiotechnology standard or
specification (e.g. IEEE 802.11, IEEE 802.15.4);
– Allocation of radio frequencies;
– The impact on the application of the equipment;
– The safety related requirements of the host equipment (see the applicable product standard)
– Hazards related to remote control operations (see the applicable product standard);
– Over the air software updates (under consideration for the next revision).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60417, Graphical symbols for use on equipment, available at http://www.graphical-
symbols.info/equipment
IEC 61000-4-39:2017, Electromagnetic compatibility (EMC) – Part 4-39: Testing and
measurement techniques – Radiated fields in close proximity – Immunity test

– 8 – IEC 63404:2024 © IEC 2024
IEC 62479, Assessment of the compliance of low-power electronic and electrical equipment
with the basic restrictions related to human exposure to electromagnetic fields (10 MHz to 300
GHz)
IEC 62657-2, Industrial networks – Coexistence of wireless systems – Part 2: Coexistence
management
ISO 7000, Graphical symbols for use on equipment, available at http://www.graphical-
symbols.info/equipment
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
radiocommunication device
radio transceiver intended to be integrated into an equipment for communication purposes
Note 1 to entry: The form of the device can be a complete single unit (module) or a set of associated elements
(antenna, transmitter, power supply, etc.).
Note 2 to entry: The original evaluation of the transmitter and receiver functions can be associated with specific
integration instructions and operating conditions.
3.2
radio transceiver
transmitter-receiver
combination in a single unit of a radio transmitter and a radio receiver employing common circuit
components and usually the same antenna for both transmitting and receiving
Note 1 to entry: A transceiver is often used as a portable or mobile station. In French, the terms “talkie-walkie” and
“walkie-talkie” are strongly deprecated in the sense of portable transmitter-receiver.
[SOURCE: IEC 60050-713:1998, 713-08-02 modified by adding radio in the term]
3.3
radio link
telecommunication facility of specified characteristics between two points provided by means
of radio waves
[SOURCE: ITU-R V.573-5:2015, A21]

3.4
antenna gain
ratio, generally expressed in decibels, of the radiation intensity produced by an antenna in a
given direction to the radiation intensity that would be obtained if the power accepted by the
antenna were radiated equally in all directions
Note 1 to entry: If no direction is specified, the direction of maximum radiation intensity from the given antenna is
implied.
Note 2 to entry: The gain is frequently expressed in decibels with respect to an isotropic antenna which is expressed
in dBi.
[SOURCE: IEC TR 62630: 2010, 3.1.6, modified with a new Note 2 to entry replacing the original
one]
3.5
antenna port
port that is connected to an antenna, either direct or by a cable. The antenna may be external
or internal to the equipment or the radiocommunication device
Note 1 to entry: Antenna ports connected to antennas internal to the equipment or the radiocommunication device
are covered by signal ports.
[SOURCE: IEC 61000-6-6:2003, 4.1, modified with equipment or the radiocommunication
device]
3.6
equivalent radiated power
ERP
product of the power supplied to the antenna and the maximum antenna gain relative to a half-
wave dipole
[SOURCE: ITU-T K.70:2020]
3.7
equivalent isotropically radiated power
EIRP
product of the power accepted by the antenna and the maximum antenna gain relative to an
isotropic antenna
[SOURCE: ITU-T K.100:2019]
3.8
host equipment
switchgear, controlgear or other equipment or assembly, intended to
host a radiocommunication device
3.9
switchgear
general term covering switching devices and their combination with associated control,
measuring, protective and regulating equipment, also assemblies of such devices and
equipment with associated interconnections, accessories, enclosures and supporting
structures, intended in principle for use in connection with generation, transmission, distribution
and conversion of electric energy
[SOURCE: IEC 60050-441:1984, 441-11-02, modified by deleting the first article]

– 10 – IEC 63404:2024 © IEC 2024
3.10
controlgear
general term covering switching devices and their combination with associated control,
measuring, protective and regulating equipment, also assemblies of such devices and
equipment with associated interconnections, accessories, enclosures and supporting
structures, intended in principle for the control of electric energy consuming equipment
[SOURCE: IEC 60050-441:1984, 441-11-03, modified by deleting the first article]
3.11
low-voltage switchgear and controlgear assembly
assembly
combination of one or more low-voltage switching devices together with associated control,
measuring, signalling, protective, regulating equipment, with all the internal electrical and
mechanical interconnections and structural parts, as defined by the original manufacturer,
which can be assembled in accordance with the original manufacturer’s instructions
[SOURCE: IEC 61439-1:2020, 3.1.1, modified – removal of notes to entry]
3.12
intelligent assembly
assembly which includes facilities for intelligent operation and maintenance for the full life cycle
by using advanced sensor technology, digital technology, network technology, communication
technology and artificial intelligence technology
[SOURCE: IEC TS 63290:—, 3.1, modified – removal of Note 1 to entry]
3.13
original manufacturer
organization that has carried out the original design and the associated verification of an
assembly in accordance with the relevant assembly standard
[SOURCE: IEC 61439-1:2011, 3.10.1]
3.14
capability profile
spectral envelope of electromagnetic radiated nearfield which an
equipment is able to withstand without degradation of its non-radio functions
4 Implementation categories
For the purpose of managing the update of the radiocommunication device of an equipment,
the following implementation categories are defined. These depend on whether the equipment
has electronic circuits and where the embedded software, called also firmware, if any,
supporting the non-radio functions of the equipment, is hosted.
The electronic circuit, including the embedded software, if any, supporting the non-radio
functions of the host equipment, can be either of:
a) Integrated fully or partially into the radiocommunication device or
b) Hosted only on the equipment, separately from the radiocommunication device or electronic
circuits without embedded software.
NOTE For the purpose of this document, the term “electronic circuit” excludes circuits in which all components are
passive (including diodes, resistors, varistors, capacitors, surge suppressors, inductors).

Five implementation categories are defined as follows:
1) Category 0: Equipment composed of a host part without electronic circuits and a
radiocommunication device intended to monitor and transmit the contact position, actuator
position or similar signal.
2) Category 1: The radiocommunication device is hosting the embedded software of the
equipment (a)) including the radiocommunication functions as illustrated in Figure 1, fully
integrated and Figure 2, partially integrated.

Figure 1 – Example of radiocommunication implementation category 1
Within the equipment, the embedded software can be distributed in several microcontroller units
(MCU) as shown in Figure 2. If one of them is also hosting the radiocommunication capabilities,
then the equipment falls in category 1.

Figure 2 – Example of radiocommunication implementation category 1
with distributed embedded software
3) Category 2: The electronic circuit of the equipment including embedded software, if any, of
the equipment is not hosted by the radiocommunication device (b)). The
radiocommunication device area is located inside the equipment, non-user removable and
placed on an identified separate location either on the same printed circuit board as illustrate
in Figure 3 or on a different printed circuit board as illustrated in Figure 4 and is only
managing the radiocommunication functions. The connection to the radiocommunication
device is grouped in an identified path (PCB traces, board to board connection, ribbon cable,
etc.) and follows the implementation requirements given by the manufacturer of the
radiocommunication device.
Figure 3 – Example of radiocommunication implementation category 2

– 12 – IEC 63404:2024 © IEC 2024

Figure 4 – Example of radiocommunication implementation category 2
on two printed circuit boards
NOTE In the case of two separate printed circuit boards, the connection between them can be realised by various
connecting means: e.g. flat cable, connectors, wires, direct soldering, etc.
4) Category 3: The radiocommunication device is integrated into a removable part of the
equipment which is hosting the radiocommunication functions (b)). This part as illustrated
on the right end side of Figure 5 can be added or removed on site.

Figure 5 – Example of radiocommunication implementation category 3
NOTE Figure 5 shows a USB connection as an example. This connection can be realised also with other
standardised or manufacturer specific connection.
5) Category 4: The radiocommunication device is a separate device used as an interface to
several equipment as illustrated in Figure 6 where equipment a and b are connected through
field bus to a common radiocommunication interface named Radio device and equipment c
is a non-communicating equipment.

Figure 6 – Example of radiocommunication implementation category 4
Examples for radiocommunication devices are shown in Annex B.

5 Characteristics
5.1 Radiocommunication
The characteristics of the radio transmitter integrated in the equipment are:
a) Centre frequency(s) and frequency bandwidth(s) in Hz;
b) Bit rate of the physical link in bit/s;
c) Duty cycle (ratio of the transmitter sequence to a given observation time for the used
frequency channel) in %, if applicable;
d) Equivalent radiated power (ERP) or Equivalent isotropic radiated power (EIRP) depending
on the associated antenna, in W;
e) Intended use: industrial and commercial (occupational) or public and domestic (general
public).
For coexistence management of multiple radiocommunication devices:
f) Coexistence parameters according to IEC 62657-2 (where applicable, the adjacent channel
selectivity, communication availability, communication reliability, communication load,
distance between the radiocommunication devices, dwell time, cut off frequencies per radio
channel, inter-visibility).
For host equipment intended to be incorporated within an assembly
g) Maximum number of units of the equipment with radiocommunication in a group, the relative
minimum distance between them and the group ERP or EIRP, if applicable;
h) Minimum distance from the equipment with radiocommunication to other equipment if lower
than the distance defined in 8.4.1.
NOTE 1 Nearfield phenomena can be effective at the distance lower than 200 mm from the electronic circuits of the
equipment. At greater distances, the existing EMC requirements given by the product standard are valid.
NOTE 2 These distances are given in the worst-case condition of electromagnetic reflection phenomena, typically
in metallic enclosure.
5.2 Radiocommunication device interfaces
User replaceable device:
a) Designation of the radiocommunication device;
b) Maximum power supply consumption;
c) Interface type;
d) Security parameters if any.
Antenna port:
e) Type of connector for external antenna on the equipment;
f) Antenna type (omni-directional, directional, arrays, smart antennas);
g) Antenna gain in dBi;
h) Antenna radiation pattern (directional (angular) dependence of the strength of the radio
waves).
– 14 – IEC 63404:2024 © IEC 2024
Embedded software update:
i) Embedded software configuration of the radiocommunication device and of the equipment
including their version, their associated hardware version compatibility and with the
identification of the permitted antennas;
j) Interface description (local port, internet protocol port, over-the-air programming);
k) Security protection description.
5.3 Radiofrequency capability profile of the host equipment
The radiofrequency capability profile characterises the withstand immunity limit of the host
equipment at close proximity for integrating a radiocommunication device. It allows the update
(see Clause 4) of the equipment with a different radiocommunication device, possibly with a
different radiotechnology, without retesting the host equipment. Three examples of
radiofrequency capability profiles for three different equipment are illustrated in Figure 7.
The first example illustrates a capability profile covering the 2,4 GHz ISM band with an electric
field level of 100 V/m. The second example illustrates a capability profile covering the 2,4 GHz
ISM band with an electric field level of 100V/m and the frequency band from 5 GHz to 6 GHz
with an electric field level of 30 V/m. The third example illustrates a capability profile covering
the wider band which can be considered as described in the scope of this standard with an
electric field level of 300 V/m for the entire considered frequency band.

Figure 7 – Examples of radiofrequency capability profile

The limit is described as follows:
Capability profile:
a) The frequency bandwidth(s) according to the radiofrequency capability profile, see 8.4.2,
b) For each capability bandwidth, the equivalent radiated power in W corresponding to the
tested immunity level according to IEC 61000-4-39.
6 Product information and marking
6.1 General
The following information shall be provided with the equipment unless different requirements
are given in the product standard:
6.2 Identification
– When a marking is used for indicating the existence of the radio transceiver in the
equipment, the following symbol ISO 7000-3600:2014-12 or an equivalent representation of
a radio wave including a group of at least two curves shall be used.

– Type designation or serial number for replaceable radiocommunication device if any
according to items a) and c) of 5.2.
6.3 Characteristics
a) Items a) to d) of 5.1 in the operating conditions of the equipment, including any limit of use
for which the equipment and its radiocommunication device has been evaluated.
NOTE The value of duty cycle is given as resulting of the actual use of the radio transmitter by the host
equipment.
b) In addition to item e) of 5.1, when the equivalent radiated power of the radiocommunication
device is exceeding the low-power exclusion level determined according to IEC 62479 for
industrial use of the equipment, specific instructions shall be provided with the equipment
for proper operation of the equipment such that exposures will be compliant with the basic
restrictions. When appropriate, the equipment can be marked with the symbol
IEC 60417-5109:2002.10.
c) Items f) of 5.1 when several radio transmitters are integrated within the equipment.
d) Items g) and h) of 5.1 for equipment intended to be incorporated in an assembly.
e) Items e) to h) of 5.2 when an external antenna can be connected to the equipment by the
user. In addition, the symbol IEC 60417-5039:2006-08 shall be marked near the antenna
terminal.
6.4 Instruction for the upgrade of the radiocommunication device
– Items a) to d) of 5.2 when the radiocommunication device is intended to be replaceable by
an alternative radiocommunication device as designated in item a).
– Items i) and k) of 5.2 when the radiocommunication embedded software is updatable.

– 16 – IEC 63404:2024 © IEC 2024
– Items a) and b) of 5.3 when the radiocommunication device is intended to be replaceable,
by the user, with a radio transceiver of other radiotechnology, other frequency band(s) or
with a different radiated power.
– For categories 0, 1 and 2, the contact information to the manufacturer should be provided
for changing the equipment to a new version equipped with a new updated
radiocommunication device.
– For categories 3 and 4, the following instructions about the upgrade procedure shall be
provided:
• the management of the hardware and embedded software configuration identified in 5.2,
• the safety and cybersecurity related aspects, and
• the contact information for obtaining a new version of the radiocommunication device.
Guidance for the preparation of product standards is given in Clause C.3.
7 Normal service, mounting and transport conditions
Normal service and mounting conditions of the radiocommunication devices among all
categories 0 to 4 are defined by the instruction manual associated with the device.
8 Constructional and performance requirements
8.1 General
According to the classification described in Clause 4, only categories 2, 3 and 4 can be
considered for the assessment of the capability profile because there is a separation between
the embedded software supporting the non-radio functions of the equipment and the
radiocommunication device (wireless part). In these cases, the requirements of this document
are sufficient and no re-evaluation of the non-radio functions of the equipment is necessary.
The assessment of an equipment of category 1 cannot be performed using the capability profile
in case the modification of the radiocommunication device directly impacts the embedded
software or the PCB supporting the non-radio functions of the equipment. This case should be
managed by re-evaluating the potentially impacted functions according to the EMC
requirements of the relevant product standard and in addition the requirement of 8.2.2, 8.2.3,
8.3, 8.4.1, 8.4.3 and the associated tests. There is no assessment and capability profile needed
for equipment of category 0.
In the product standard referring to this document, there shall be no lower voltage limit with
respect to hazards.
NOTE In Europe, the low voltage limit (50 V AC or 75 V DC) does not apply for radiocommunication equipment.
8.2 Constructional
8.2.1 Upgrade of the radiocommunication device
Depending on its classification as given in Clause 4, the upgrade of the equipment with a new
radiocommunication device may be provided within the equipment either:
– For category 2, the upgrade shall be managed by the redesign of the radiocommunication
device and its interface within the equipment.
When the radiocommunication device is integrated into the printed circuit board of the host
equipment, the update of the layout shall be limited to the radiocommunication device area.
– For categories 3 and 4, the update method shall be described in the manual instruction
provided either with the equipment or with the new radiocommunication device.

NOTE The impact of any constructional change on the equipment side, such as its mechanical structure
...