IEC 62841-1:2014/AMD1:2025

IEC 62841-1 ®
Edition 1.0 2025-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Electric motor-operated hand-held tools, transportable tools and lawn and
garden machinery – Safety –
Part 1: General requirements
Outils électroportatifs à moteur, outils portables et machines pour jardins et
pelouses – Sécurité –
Partie 1: Règles générales
IEC 62841-1:2014-03/AMD1:2025-03(en-fr)

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IEC 62841-1 ®
Edition 1.0 2025-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Electric motor-operated hand-held tools, transportable tools and lawn and

garden machinery – Safety –
Part 1: General requirements
Outils électroportatifs à moteur, outils portables et machines pour jardins et

pelouses – Sécurité –
Partie 1: Règles générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.140.20  ISBN 978-2-8327-0234-5

– 2 – IEC 62841-1:2014/AMD1:2025
© IEC 2025
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRIC MOTOR-OPERATED HAND-HELD TOOLS, TRANSPORTABLE
TOOLS AND LAWN AND GARDEN MACHINERY –
SAFETY –
Part 1: General requirements
AMENDMENT 1
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
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
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expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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.
Amendment 1 to IEC 62841-1:2014 has been prepared by IEC technical committee 116: Safety
of motor-operated electric tools.
The text of this Amendment is based on the following documents:
Draft Report on voting
116/863/FDIS 116/883/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
© IEC 2025
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/.
A list of all parts of the IEC 62841 series, published under the general title Electric motor-
operated handheld tools, transportable tools and lawn and garden machinery – Safety, can be
found on the IEC website.
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.
NOTE The attention of National Committees is drawn to the fact that equipment manufacturers and testing
organizations may need a transitional period following publication of a new, amended or revised IEC publication in
which to make products in accordance with the new requirements and to equip themselves for conducting new or
revised tests.
It is the recommendation of the committee that the content of this publication be adopted for implementation nationally
not earlier than 36 months from the date of publication.
___________
FOREWORD
Add, at the end of the Foreword, the following new Note 4:
NOTE 4 In Europe (EN 62841-1), the following additional paragraph applies:
When a relevant Part 2, 3, or 4 does not exist, this document can be used to support the risk assessment process in
order to establish requirements for the tool.
2 Normative references
Delete the existing normative reference ISO/TR 11690-3 from the list.
3 Terms and definitions
Add, after 3.63, the following new terms and definitions:
3.64
entity
person, device, tool, product or service that interacts with a tool, battery pack or charger
3.65
message
data which is transmitted from a sender (data source) to one or more receivers (data sink)

– 4 – IEC 62841-1:2014/AMD1:2025
© IEC 2025
3.66
public network
network carrying digital data or analogue signals or both where access to the data and signals
is not restricted by the physical space within the use environment of the tool, battery or
charging system
Note 1 to entry: Determination of confinement to the physical space includes consideration of the network's range
of communication, configuration, or construction.
Note 2 to entry: For the purposes of this document, examples of public networks include, but are not limited to:
− PAN (personal area network);
− LAN (local area network) connected devices which can or cannot be connected to a gateway, such as BLE
(Bluetooth Low Energy), Bluetooth or WLAN (wireless local area network);
− PLC (power line communication);
− SRD (short range devices); and
− WAN (wide area network).
Note 3 to entry: For the purposes of this document, examples of networks which are not considered as being public
networks include, but are not limited to:
− NFC (near field communication);
− optical communication with line of sight (infra-red rays or visual rays); and
− hardwired configurations constructed of physical media
without connection to a public network.
3.67
remote communication
transmission of data between the tool, battery pack or charger and an entity that can be
initiated out of sight of the tool, battery pack or charger using communication means such as
radio wave modulation, sound wave modulation or bus systems
Note 1 to entry: Examples of transmission of data include, but are not limited to, remote monitoring, software
downloading or control parameter modifications.
Note 2 to entry: Transmission of data can be one-way (simplex) or two-way (duplex).
3.68
authentication
provision for confirming that the entity sending or receiving a message is what or who it claims
to be
3.69
authorization
means to ensure that the authenticated entity requesting access to information, functions or
services has the required authority
3.70
cryptographic technique
calculation of output data using a mathematical algorithm to encode input data with a key as a
parameter
3.71
data integrity protection
protection that enables the tool to confirm the data has not been altered, lost or destroyed

© IEC 2025
8 Marking and instructions
Replace, in 8.3, the existing text of the sixth dash with the following new text:
– if the mass of the tool is greater than 25 kg: "> 25 kg" or the mass of the tool in kg.
Add, before the last paragraph of 8.3, the following new Note 3:
NOTE 3 In Europe (EN 62841-1), the following additional requirement applies:
Tools shall be additionally marked with the website, e-mail address or other digital contact at which the manufacturer
can be contacted. Where the size or nature of the tool does not allow the marking on the product, the required
information shall be provided on the packaging or in an accompanying document.
For tools where the instruction manual is provided only in a digital format, the tool shall be marked with information
on how to access the digital instructions. Where the size or nature of the tool does not allow the marking on the
product, the required information shall be provided on the packaging or in an accompanying document.
Add, after the first paragraph of 8.14, the following new Note:
NOTE 1 In Europe (EN 62841-1), the above paragraph is replaced by the following:
Except as provided below, an instruction manual and safety instructions shall be provided with the tool and
packaged in such a way that is noticed by the user when the tool is removed from the packaging. An
explanation of the symbols required by this standard and used on the tool shall be provided in either the
instruction manual or the safety instructions.
Instructions may be provided in digital format in accordance with Regulation (EU) 2023/1230.
NOTE If instructions are provided in digital format, the following safety information is regarded as
essential in accordance with Regulation (EU) 2023/1230:
– safety instructions in accordance with 8.14.1, Annex K and Annex L, as applicable and
– additional safety instructions related to assembly, start-up, operation, maintenance and transport of
the tool that is deemed necessary by the manufacturer.
Renumber the existing Note as Note 2.
Add, at end of 8.14.1.1 2), the following new Note 2 and renumber the existing Note as Note 1:
NOTE 2 The warnings in items a), b), d), e) and f) above can be omitted for tools covered by Annex K.
Add, at the end of 8.14.2 a), the following new text:
9) For hand-held tools and transportable tools that produce a considerable amount of
dust in accordance with 21.35, instructions how to properly connect the dust extraction
system to the tool including any associated devices.
Replace the existing text of 8.14.2 b) 7) with the following new text:
7) For tools with electronic speed or load regulators that reduce the output spindle torque
of the tool during a stalled condition and will increase the output spindle torque after the
stalled condition is removed: a warning that the tool will resume normal operation
immediately after the stalled condition is removed;
Add, at the end of 8.14.2 c), the following new text:
8) For hand-held tools and transportable tools that produce a considerable amount of
dust as specified in 21.35:
– information when to empty, change or maintain an integral dust collection/suction
device, if any, in order to keep its effectiveness; and
– information to read the instruction manual of the connected external suction device,
if any, in order to keep its effectiveness.

– 6 – IEC 62841-1:2014/AMD1:2025
© IEC 2025
Replace the existing text of the Note in 8.14.2 with the following new text:
NOTE In Europe (EN 62841-1), the following additional requirements apply:
8.14.2 Za)
Noise emissions:
1) The noise emission, measured in accordance with Clause I.2, as follows:
– A-weighted emission sound pressure level L and its uncertainty K , where L exceeds 70 dB(A).
pA pA pA
Where L does not exceed 70 dB(A), this fact shall be indicated, either by a statement or by listing the
pA
actual measured value;
– A-weighted sound power level L and its uncertainty K , where the A-weighted sound pressure level
WA WA
L exceeds 80 dB(A);
pA
– C-weighted peak emission sound pressure value L , where this exceeds 130 dB in relation to
pC,peak
20 µPa.
2) Recommendation for the operator to wear hearing protection.
Continuous vibration:
3) For hand-held tools and lawn and garden machinery where Clause I.3 is applicable, the following applies:
The vibration total value and its uncertainty measured in accordance with I.3.
Information and warnings on noise and vibration emissions:
4) The following information:
– that the declared vibration total value and declared noise emission values have been measured in
accordance with a standard test method and can be used for comparing one tool with another;
– that the declared vibration total value and declared noise emission values can also be used in a
preliminary assessment of exposure.
5) A warning:
– that the vibration emission and noise emission during actual use of the power tool can differ from the
declared total value depending on the ways in which the tool is used; and
– of the need to identify safety measures to protect the operator that are based on an estimation of
exposure in the actual conditions of use (taking account of all parts of the operating cycle such as the
times when the tool is switched off and when it is running idle in addition to the trigger time).
8.14.2 Zb)
For hand-held tools and lawn and garden machinery where Clause I.3 is applicable, the mean value of the peak
amplitude of the acceleration from repeated shock vibrations and its uncertainty shall be specified in the instructions
based on the vibration raw data determined by the vibration measurement in accordance with Clause I.3.
NOTE 1 A new standard ISO 5349-3 is currently in development that will specify the calculation method to
determine the mean value of the peak amplitude of the acceleration, expressed as p .
F
NOTE 2 Vibration raw data could show significantly higher shocks at the beginning or at the end of the measured
work cycle. These peaks are not correlated to the repeated shock behaviour of a tool. Therefore, these shocks are
disregarded for the calculation in accordance with ISO 5349-3 .
8.14.2 Zc)
Hazardous dust emissions:
1) For tools equipped with dust outlet(s) to connect an external suction device as specified in 21.35, information
indicating the characteristics and at least the recommended filtration efficiency of the external suction device
considering the normal use of the tool.
NOTE 1 An example of filtration efficiency is the dust class in accordance with IEC 60335-2-69.
NOTE 2 Examples for characteristics to connect an external suction device to the tool are the appropriate
connecting dimensions for the suction hose, the minimum required volume flow in m /h and the resulting
underpressure (negative pressure) at the tool interface with the external suction device in hPa necessary
for normal use.
___________
Under preparation. Stage at the time of publication: ISO/DIS 5349-3:2024.

© IEC 2025
2) For tools equipped with a liquid system for suppressing the released dust, information indicating the
required technical characteristics of the liquid system.
Add, at the end of 8.14.3, the following new Note:
NOTE In Europe (EN 62841-1), the first paragraph is replaced by the following text:
8.14.3 Information about the mass of the tool shall be provided in the instructions. An explanatory note shall be
given regarding any attachments or interchangeable parts in accordance with 8.14.2 a) 2) that have been included
to determine the mass.
21 Construction
Replace, at the end of 21.18.1.2, the existing Note with the following new Note:
NOTE In Europe (EN 62841-1), the following additional requirement applies:
Unless hand-held tools are equipped with a momentary power switch without a lock-on device, voltage recovery
following an interruption of the supply shall not give rise to a hazard. The relevant part of IEC 62841-2 specifies if
this subclause applies and gives specific requirements.
Compliance is checked by inspection and by practical test.
21.35 Dust collection
Replace the existing title and text of 21.35 with the following new text:
21.35 Tools as identified in the relevant part of IEC 62841-2 or IEC 62841-3, which produce
a considerable amount of dust and are not equipped with a liquid system for suppressing the
released dust, shall be
– provided with an integral dust collection/suction device; or
– provided with a dust outlet(s) for the connection of external suction device(s) which direct
the discharge away from the operator; or
– designed to be used with a device provided separately by the manufacturer for the collection
of dust or the connection of external suction device(s)
for minimizing the by-products of the working process from entering the air.
These devices, along with any external suction device(s) for evacuating the by-products of the
working process, shall not impede the normal use of the tool.
Compliance is checked by inspection.
Add, after 21.35, the following new subclauses:
21.36 Remote communication through public networks shall not impair the safety of the
tool.
This requirement is only applicable if remote communication includes the download of
software or the exchange of data that:
a) could affect software relied upon to provide a safety critical function or software, the
impairment of which could cause the failure of a lithium-ion charging system; or

– 8 – IEC 62841-1:2014/AMD1:2025
© IEC 2025
b) only affects that part of software that is not covered by the above item a), but where software
as identified in item a) above could be impaired due to inadequate separation or partitioning
from the software in item a) above.
Measures to ensure separation and partitioning are considered adequate if:
• incorrect transmission of remotely communicated parameters, or
• consumption of available processor time by downloaded software, or
• use of processor infrastructure by downloaded software, or
• data corruption due to a failure of downloaded software, such as recursion beyond
available stack memory or incorrect pointer calculation
cannot impair a safety critical function or the safety of a lithium-ion charging system.
NOTE 1 An example for a measure to ensure adequate separation and partitioning is the use of two
independent processors, one for the management of remote communication and one for operation of functions
relied for compliance with this document. Communication between those two processors is based on a protocol
providing limitations to avoid interference with the functions relied on for compliance with this document.
NOTE 2 Another example for measures to ensure adequate separation and partitioning is the use of:
– time fences which will terminate the execution of downloaded software if it overruns the available execution
time, and
– software protection of data, corruption of which can impair compliance with this document.
This requirement is not applicable to tools
– where all measures to comply with this document are independent of software;
– where software is located on a separate microprocessor from the main microprocessor
• which contains the software responsible for the SCF or the safety of a lithium-ion
charging system; and
• where the separate microprocessor is not capable of altering code on the main
microprocessor;
NOTE 3 An example are specialized Bluetooth modules which communicate with the host processor but are
only capable of passing data, not relied upon for correct operation of any SCF or a lithium-ion charging system.
The Bluetooth module can be accessible to the public network, but there is no path to corrupt code on the host.
– using remote communication through public networks for the send-only transmission of
data; or
– that only provide event driven messages or push remote monitoring.
Compliance is checked by inspection of the tool, inspection of the technical documentation of
the software, and by the requirements of Annex M.
21.37 Tools provided with interface(s) other than for remote communication through public
networks, that can be used to modify settings, data or software, the corruption of which could
impair an SCF or the safety of a lithium-ion charging system, shall either require the use of
– a tool for access to the interface(s); or
– specialized equipment in order to modify settings, data or software; or
– a password or similar method before settings, data or software can be altered.
Compliance is checked by inspection.
Annex G – Void
Replace the existing Annex G with the following new annex:

© IEC 2025
Annex G
(informative)
Determination of applicable requirements for tools covered by Annex K
Figure G.1 provides information for the determination of applicable requirements for tools
covered by Annex K.
– 10 – IEC 62841-1:2014/AMD1:2025
© IEC 2025
© IEC 2025
Figure G.1 – Determination of applicable requirements for tools covered by Annex K

– 12 – IEC 62841-1:2014/AMD1:2025
© IEC 2025
Annex I − Measurement of noise and vibration emissions
Replace the existing text of I.2.3.1 with the following new text:
I.2.3.1 Hand-held tools
The A-weighted emission sound pressure level at the workstation, L , shall be determined in
pA
accordance with ISO 11203 as follows:
L = L −Q
pA WA
where Q = 8 dB.
NOTE 1 This value of Q has been determined, during experimental investigations, to be applicable to hand-held
tools. The resulting A-weighted emission sound pressure level at the workstation is equivalent to the value of the
surface sound pressure level at a distance of 0,7 m from the power tool. This distance has been chosen to give
satisfactory reproducibility of results, and to permit comparison of the acoustic performance of different hand-held
tools which do not, in general, have uniquely defined workstations. Under free field conditions, where it can be
required to estimate the emission sound pressure level, L , at a distance r in m from the geometric centre of the
pA,r1 1
power tool, this can be done by applying the formula:
0,7
L = L + 20 lg dB
pA,r1 pA ()
r
NOTE 2 At any given position in relation to a particular power tool, and for given mounting and operating conditions,
the emission sound pressure levels determined by the method of this standard will in general be lower than the
directly measured sound pressure levels for the same power tool in the typical workroom where it is used. This is
due to the influence of sound reflecting surfaces in the workroom compared to the free field conditions of the test
specified here. A method of calculating the sound pressure levels in the vicinity of a power tool operating alone in a
workroom is given in ISO/TR 11690-3. Commonly observed differences are 1 dB to 5 dB, but in extreme cases the
difference can be even greater.
If required, the C-weighted peak emission sound pressure level L shall be measured at
pC,peak
each of the five measurement positions specified in I.2.2. The C-weighted peak emission sound
pressure level at the workstation is the highest C-weighted peak emission sound pressure level
measured at any of the five microphone positions; no corrections are permitted.
I.2.4 Installation and mounting conditions of the power tools during noise tests
Replace the existing text of the third paragraph with the following new text:
A hand-held tool is held by the operator or suspended in such a way as to correspond to
normal use, as specified in the relevant part of IEC 62841-2. If the hand-held tool is used
horizontally, it shall be positioned so that its axis is at 45° between the microphone positions
1 and 4 and 2 and 3 (see Figure I.2); its geometrical centre shall be (1 ± 0,05) m above the
ground (reflecting plane). If these requirements are impracticable or the tool is not used
horizontally, the adopted positions shall be recorded and described in the test report.
I.2.5 Operating conditions
Add, at the end, the following new text:
The temperature requirements in accordance with 5.6 are not applicable.

© IEC 2025
Replace the existing text of I.2.9 with the following new text:
I.2.9 Declaration and verification of noise emission values
The declaration of the noise emission values shall be a dual number in accordance with
ISO 4871:1996. It shall declare the noise emission value L (L and L ) and the respective
pA WA
uncertainty K (K and K ). If required, the C-weighted emission peak sound pressure level
pA WA
L shall be given.
pC,peak
NOTE 1 For a standard deviation of reproducibility of the method σ of 1,5 dB and for a typical standard deviation
R0
of production, the values for the uncertainties, K and K respectively, are expected to be 3 dB, particularly for
pA WA
tools tested at no-load. For tests done under load, the uncertainty can be higher.
The noise declaration shall state that the noise emission values have been obtained according
to this noise test code. If this statement is not true, the noise declaration shall indicate clearly
what the deviations from this document, and from the basic standards, are.
NOTE 2 If the measured value is the average based on a sample of three power tools that has been properly
sampled, then K normally is 3 dB. Further guidance on sampling and uncertainty terms is given in ISO 7574-4 and
ISO 4871:1996.
If undertaken, verification shall be performed according to ISO 4871:1996 by using the same
mounting, installation and operating conditions as those used for the initial determination of
noise emission values.
I.3.6 Measurement procedure and validity
Replace the existing text of the third paragraph of I.3.6.1 with the following new text:
If the coefficient of variation C of the five vibration total values a , recorded for each series,
V hv
is less than 0,15 or the standard deviation s is less than 0,3 m/s , the results are accepted.
N–1
If C is greater than 0,15 or if s is greater than 0,3 m/s , the measurements shall be checked
V N–1
for error before the data are accepted.
NOTE The Note in I.3.1 provides information on possible sources of errors of measurement.
Annex K − Battery tools and battery packs
Add, at the end of Clause K.1, the following new Note 3:
NOTE 3 Annex G gives guidance regarding the application of requirements for a battery-operated tool, including
the application of requirements in a relevant part of IEC 62841-2, IEC 62841-3 and IEC 62841-4.
Replace the existing text of K.18.1, items b) and c), with the following new text:
b) The terminals of each motor are shorted one at a time, except for electronically commutated
motors.
c) The rotor of each motor is locked one at a time, except for electronically commutated motors.

– 14 – IEC 62841-1:2014/AMD1:2025
© IEC 2025
Add, after Annex L, the following new Annexes M and N:
Annex M
(normative)
Remote communication through public networks
M.1 Overview
The measures given in this annex are intended to avoid unauthorized access and the effects of
transmission failures via remote communication through public networks, where unsafe
behaviour could occur as a result.
However, in general, it does not cover aspects concerning confidentiality of data and privacy.
M.2 Marking and instructions
If there is a provision for software download, instructions shall be provided on how or where to
obtain the unique name or code given by the manufacturer, that identifies the current version
of the software running in the tool, battery pack or charger, if the charger contains software
that is relied on for the safety of a lithium-ion charging system. The instructions shall also
include the necessary steps the person responsible for maintaining the safety of the tool,
battery pack or charger shall follow for the software update procedure.
Compliance is checked by inspection.
M.3 Construction
M.3.1 Software enabling communication with a public network shall be partitioned into
modules separate from software which is necessary to comply with the other requirements of
this document.
NOTE Requirements for partitioning into modules are given in 21.36.
Compliance is checked by inspection.
M.3.2 Protection of data against random transmission errors
M.3.2.1 Qualitative analysis
For remote communication through public networks, measures shall be provided to mitigate
the transmission errors specified in Table M.1, if those transmission errors would impair
compliance with this document. Other measures than the examples specified in Table M.1 are
acceptable if they are proven to be effective.
Compliance is checked by inspection.

© IEC 2025
Table M.1 – Transmission errors and examples of acceptable measures
Example of acceptable measures
Sequence Time Time- Error Transfer Cryptographic
Transmission errors to be covered
a b c e f
detection
number stamp out redundancy techniques
d
code
Repetition of a message
1 x x
Due to an error, fault or interference,

messages are repeated.
Deletion of a message
Due to an error, fault or interference,
2 x
a message or acknowledgment is
not received.
Insertion of a message
Due to a fault or interference, a
3 x
message is received that relates to
an unexpected or unknown source
entity.
Re-sequence
Due to an error, fault or interference,
the predefined sequence (for
4 x x
example natural numbers, time
references) associated with
messages from a particular source
is incorrect.
Incorrect transmission of data in a
message
The message is accidentally
5  x x x
changed (e.g. electromagnetic
interference) to another formally
correct message.
Delay in transmission of a
message
6 x x
Due to overload of the transmission
system, a message is received later
than expected.
Interruption of data transfer
Due to failure of the transmission
7  x
system, the communication is
terminated unexpectedly.
Incomplete transmission of a
message
Due to failure of the transmission
8  x
system, the communication is
terminated unexpectedly during
transmission of a message.
– 16 – IEC 62841-1:2014/AMD1:2025
© IEC 2025
NOTE Further examples of acceptable measures can also be found in IEC 62280.
a
Additional data field containing a number that changes in a predefined way from message to message.
b
Information concerning time of transmission attached to a message by the sender.
c
Delay between two messages or two bytes of one message exceeding a predefined allowed maximum time. If
this is the case, an error can be assumed.
d
Additional data included in a message to permit data corruptions to be detected by the transmission function.
Safety code provides data integrity protection with regard to transmission errors, such as
– word protection with multi-bit redundancy; or
– cyclic redundancy check (CRC) – single word; or
– transfer redundancy; or
– protocol test.
e
Form of code safety in which data is transferred at least twice in succession and then compared.
f An example of a cryptographic technique that can be effective against transmission errors is a message
authentication code.
M.3.2.2 Quantitative analysis
Means shall be provided to ensure that the average probability of dangerous failure per hour
PFH
( ) caused by incorrect transmission of data during remote communication through
D
COM
public networks (i.e. erroneous frames being received as formally correct messages) is less
-8
than 10 /h.
NOTE 1 See Annex N for guidance to demonstrate that the average probability of dangerous failure per hour
( PFH ) does not exceed the specified maximum value.
D
COM
For the purpose of the estimation of the failure rate, the following parameters may be assumed:
– a binary symmetric and discrete memoryless channel. In case symbols (i.e. non-binary
codes) are used, the q-nary symmetric channel model can be more suitable;
– the bit error rate does not exceed BER = 0, 001 errors/Bit . A lower bit error rate may be used if
a rationale is provided. In case symbols (i.e. non-binary codes) are used, a symbol error
rate should be estimated;
NOTE 2 A higher bit error rate will, with sufficient probability, prevent a communication link from being
established.
NOTE 3 In accordance with the black channel approach used throughout this annex, interruption of the
communication represents a safe state.
– for the purpose of this calculation, the useful lifespan of a tool may be assumed to not
exceed 10 years.
Compliance is checked by inspection of source code or accompanying documentation. In case
of doubt, the evaluation can be supplemented by simulation of the fault conditions.
NOTE 4 Examples of accompanying documentation include flowcharts, state machine diagrams or timing diagrams.
M.3.3 Measures shall be provided to protect against hazards arising from the reception of
messages from several sources simultaneously or sequentially.
Compliance is checked by inspection of the source code or accompanying documentation.
NOTE Examples of accompanying documentation include flowcharts, state machine diagrams or timing diagrams.

© IEC 2025
M.3.4 Remote communication shall not be enabled prior to authorization. Authorization
shall be based on authentication. The authentication process shall use cryptographic
techniques to ensure the identity of both parties.
For the purposes of this requirement, communication between two entities for preparation of
the authentication and authorization process is not considered remote communication.
Compliance is checked by inspection of source code or accompanying documentation.
NOTE Examples of accompanying documentation include flowcharts, state machine diagrams or timing diagrams.
M.3.5 Cryptographic techniques shall be implemented to prevent unauthorized access once
authorization for remote communication is established.
The cryptographic techniques employed shall be part of the tool including its accessories,
and not rely upon part of the router or similar data transmission device external to the tool,
battery or charger itself, and shall be performed prior to transmission.
NOTE An example for cryptographic techniques is the use of message authentication codes (MACs) in
accordance with ISO/IEC 9797 (all parts) to maintain the integrity of the data during remote communication.
Compliance is checked by inspection and review of technical documentation which proves
adherence to the commonly accepted cryptographic techniques and methods.
M.3.6 Provisions shall be taken to ensure that software updates provided by the manufacturer
and transmitted to the tool, battery pack or charger via remote communication shall be
verified prior to its installation that the software version is compatible with the tool, battery pack
or charger for which the software version was designed.
Compliance is checked by evaluating the software and the manufacturer's version management
documentation.
M.3.7 The method for updating the software shall require permission for each installation of
software in the tool, battery pack or charger.
Activation of a mode that enables automatic software updates is permitted.
Compliance is checked by inspection.
M.3.8 The installation of software shall not impair the safety of the tool, battery pack or
lithium-ion charging system during or after installation.
Compliance is checked by software inspection.
M.3.9 Software functions relied upon for compliance with M.3.2. M.3.3 and M.3.6 shall be
developed in accordance with IEC 60730-1:2010, H.11.12.3.
IEC 60730-1:2010, H.11.12.3.4.1 is only applicable if the safety critical function provided by
the electronic circuit under consideration has PL=c or higher and where sufficient
independence between exchanged data or downloaded software to that safety critical function
cannot be demonstrated.
Compliance is checked by evaluation of the relevant portions of the software in accordance with
IEC 60730-1:2010, H.11.12.3.
– 18 – IEC 62841-1:2014/AMD1:2025
© IEC 2025
Annex N
(informative)
Methods to estimate the average probability of dangerous failure per hour
caused by remote communication through public networks
N.1 Probability of an erroneous frame being received as a formally correct
message
Unless for a specific protocol there are more suitable mathematical models available, one of
the following should be used to calculate the failure rate:
– for a binary symmetric channel (q = 2), a proper check sequence (error detection code) of
length n-k bit is assumed to limit the probability of an undetected error during transmission
of one message (protocol data unit) P :
ue
−
...