SIST IEC/TR2 62056-41:2001

IEC 62841-2-1 ®
Edition 1.1 2021-11
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electric motor-operated hand-held tools, transportable tools and lawn and
garden machinery –
Part 2-1: Particular requirements for hand-held drills and impact drills

Outils électroportatifs à moteur, outils portables et machines pour jardins et
pelouses –
Partie 2-1: Exigences particulières pour les perceuses portatives et les
perceuses à percussion
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IEC 62841-2-1 ®
Edition 1.1 2021-11
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electric motor-operated hand-held tools, transportable tools and lawn and
garden machinery –
Part 2-1: Particular requirements for hand-held drills and impact drills
Outils électroportatifs à moteur, outils portables et machines pour jardins et
pelouses –
Partie 2-1: Exigences particulières pour les perceuses portatives et les
perceuses à percussion
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.140.20 ISBN 978-2-8322-5393-9

IEC 62841-2-1 ®
Edition 1.1 2021-11
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
Electric motor-operated hand-held tools, transportable tools and lawn and
garden machinery –
Part 2-1: Particular requirements for hand-held drills and impact drills

Outils électroportatifs à moteur, outils portables et machines pour jardins et
pelouses –
Partie 2-1: Exigences particulières pour les perceuses portatives et les
perceuses à percussion
– 2 – IEC 62841-2-1:2017+AMD1:2021 CSV
© IEC 2021
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 General requirements . 7
5 General conditions for the tests . 7
6 Radiation, toxicity and similar hazards . 7
7 Classification . 7
8 Marking and instructions . 7
9 Protection against access to live parts . 8
10 Starting . 8
11 Input and current . 8
12 Heating . 8
13 Resistance to heat and fire . 9
14 Moisture resistance . 9
15 Resistance to rusting . 9
16 Overload protection of transformers and associated circuits . 9
17 Endurance . 9
18 Abnormal operation . 10
19 Mechanical hazards . 11
20 Mechanical strength . 13
21 Construction . 14
22 Internal wiring . 14
23 Components . 14
24 Supply connection and external flexible cords . 15
25 Terminals for external conductors . 15
26 Provision for earthing . 15
27 Screws and connections . 15
28 Creepage distances, clearances and distances through insulation . 15
Annexes . 26
Annex I (informative) Measurement of noise and vibration emissions . 26
Annex K (normative) Battery tools and battery packs . 34
Annex L (normative) Battery tools and battery packs provided with mains connection
or non-isolated sources . 39
Bibliography . 41

Figure 101 – Example of a testing apparatus . 16
Figure 102 – Locating point “S” on different power switch and handle designs . 17
Figure 103 – Locating point “F” on different flange designs . 18
Figure 104 – Reaction torque measurement of single handle tools (1) . 19
Figure 105 – Reaction torque measurement of single handle tools (2) . 21

© IEC 2021
Figure 106 – Reaction torque measurement of multi handle tools (1) . 22
Figure 107 – Reaction torque measurement of multi handle tools (2) . 23
Figure 108 – Example torque of a tool with a stable signal region . 24
Figure 109 – Example torque of a tool without a stable signal region . 24
Figure 110 – Example torque of a tool with an overload clutch . 25
Figure I.101 – Application of load . 32
Figure I.102 – Positions of transducers for drills and impact drills . 33
Figure I.103 – Positions of transducers for diamond core drills . 33

Table 4 – Required performance levels . 10
Table I.101 – Concrete formulation for impact drills (per cubic metre) . 27
Table I.102 – Noise test conditions for impact drills . 27
Table I.103 – Noise test conditions for diamond core drills . 28
Table I.103104 – Vibration test conditions for drills . 29
Table I.104105 – Drill bit diameter and feed force for drills . 29
Table I.105106 – Vibration test conditions for impact drills . 30
Table I.106107 – Vibration test conditions for diamond core drills . 30
Table I.108 – Concrete specifications . 31
Table I.107109 – Concrete formulation for diamond core drills (per cubic metre)
Detailed example of a concrete formulation that fulfils the requirements of Table I.108 . 31
Table 4 – Required performance levels . 35

– 4 – IEC 62841-2-1:2017+AMD1:2021 CSV
© IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRIC MOTOR-OPERATED HAND-HELD TOOLS, TRANSPORTABLE
TOOLS AND LAWN AND GARDEN MACHINERY – SAFETY –

Part 2-1: Particular requirements for hand-held drills and impact drills

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.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
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) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
This consolidated version of the official IEC Standard and its amendment has been
prepared for user convenience.
IEC 62841-2-1 edition 1.1 contains the first edition (2017-06) [documents 116/321/FDIS
and 116/330/RVD] and its amendment 1 (2021-11) [documents 116/519/FDIS and
116/525/RVD].
In this Redline version, a vertical line in the margin shows where the technical content
is modified by amendment 1. Additions are in green text, deletions are in strikethrough
red text. A separate Final version with all changes accepted is available in this
publication.
© IEC 2021
International Standard IEC 62841-2-1 has been prepared by IEC technical committee 116:
Safety of motor-operated electric tools.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
This Part 2-1 is to be used in conjunction with the first edition of IEC 62841-1 (2014).
This Part 2-1 supplements or modifies the corresponding clauses in IEC 62841-1, so as to
convert it into the IEC Standard: Particular requirements for hand-held drills and impact drills.
Where a particular subclause of Part 1 is not mentioned in this Part 2-1, that subclause
applies as far as relevant. Where this standard states “addition”, “modification” or
“replacement”, the relevant text in Part 1 is to be adapted accordingly.
The following print types are used:
– requirements: in roman type;
– test specifications: in italic type;
– notes: in small roman type.
The terms defined in Clause 3 are printed in bold typeface.
Subclauses, notes and figures which are additional to those in Part 1 are numbered starting
from 101.
A list of all parts of the IEC 62841 series, under the general title: Electric motor-operated
hand-held tools, transportable tools and lawn and garden machinery – Safety, can be found
on the IEC website.
The committee has decided that the contents of the base publication and its amendment will
remain unchanged until the stability date indicated on the IEC web site under 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.
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.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
– 6 – IEC 62841-2-1:2017+AMD1:2021 CSV
© IEC 2021
ELECTRIC MOTOR-OPERATED HAND-HELD TOOLS, TRANSPORTABLE
TOOLS AND LAWN AND GARDEN MACHINERY – SAFETY –

Part 2-1: Particular requirements for hand-held drills and impact drills

1 Scope
This clause of Part 1 is applicable, except as follows:
Addition:
This part of IEC 62841 applies to hand-held drills and impact drills, including diamond core
drills. This standard document also applies to drills that can be used for driving screws by
attaching screwdriver bits.
This standard document does not apply to rotary hammers, screwdrivers, impact wrenches
and ratchet drivers even if they can be used as a drill.
NOTE 101 Rotary hammers are covered by IEC 62841-2-6.
NOTE 102 Screwdrivers, impact wrenches and ratchet drivers are covered by IEC 62841-2-2.
2 Normative references
This clause of Part 1 is applicable, except as follows:
Addition:
ISO 185:2005, Grey cast irons – Classification
ISO 630-2:2011, Structural steels – Part 2: Technical delivery conditions for structural steels
for general purposes
3 Terms and definitions
This clause of Part 1 is applicable, except as follows:
Additional definitions:
3.101
drill
tool equipped with either a typical three jaw chuck or a machine taper, specifically designed to
bore holes in various materials such as metal, plastics, wood, etc.
Note 1 to entry: Besides drill bits, it is possible that other accessories such as bits for deburring and
screwdriving are used with drills.
3.102
impact drill
tool equipped with a chuck specifically designed to bore holes in concrete, stone and other
materials, being similar in appearance and construction, to a drill, but which has a built-in
percussion system which gives an axial percussion movement to rotating output spindle

© IEC 2021
Note 1 to entry: Some impact drills have a device for rendering the percussion system inoperative, so that they
can be used as a conventional drill.
Note 2 to entry: Besides drill bits, it is possible that other accessories such as bits for deburring and
screwdriving are used with impact drills.
3.103
diamond core drill
drill or impact drill designed to be equipped with a diamond core drill bit with or without a
liquid system to drill into materials such as concrete or brick, see Figure I.103
4 General requirements
This clause of Part 1 is applicable.
5 General conditions for the tests
This clause of Part 1 is applicable, except as follows:
5.17 Addition:
The mass of the tool includes the drill chuck and the auxiliary handle, if any.
6 Radiation, toxicity and similar hazards
This clause of Part 1 is applicable.
7 Classification
This clause of Part 1 is applicable.
8 Marking and instructions
This clause of Part 1 is applicable, except as follows:
8.1 Addition:
Drills and impact drills shall be marked with the following:
– rated no-load speed.
8.3 Addition:
Chucks of drills and impact drills shall be marked with the maximum capacity of the chuck.
8.14.1 Addition:
The additional safety instructions as specified in 8.14.1.101 shall be given. This part may be
printed separately from the “General Power Tool Safety Warnings”.
8.14.1.101 Drill safety warnings
1) Safety instructions for all operations
a) Wear ear protectors when impact drilling. Exposure to noise can cause hearing
loss.
– 8 – IEC 62841-2-1:2017+AMD1:2021 CSV
© IEC 2021
NOTE 1 The above warning applies only to impact drills and is omitted for drills.
b) Use the auxiliary handle(s). Loss of control can cause personal injury.
NOTE 2 The above warning applies only to tools that are provided with auxiliary handle(s).
c) Brace the tool properly before use. This tool produces a high output torque and
without properly bracing the tool during operation, loss of control may occur resulting
in personal injury.
NOTE 3 The above warning applies only for tools with a maximum output torque greater than 100 Nm
measured in accordance with 19.102.
d) Hold the power tool by insulated gripping surfaces, when performing an
operation where the cutting accessory may contact hidden wiring or its own
cord. Cutting accessory contacting a "live" wire may make exposed metal parts of the
power tool "live" and could give the operator an electric shock.
NOTE 4 For drills that can also be used as screwdrivers, the words “or fasteners” are added after
“cutting accessory”.
2) Safety instructions when using long drill bits
a) Never operate at higher speed than the maximum speed rating of the drill bit. At
higher speeds, the bit is likely to bend if allowed to rotate freely without contacting the
workpiece, resulting in personal injury.
b) Always start drilling at low speed and with the bit tip in contact with the
workpiece. At higher speeds, the bit is likely to bend if allowed to rotate freely without
contacting the workpiece, resulting in personal injury.
c) Apply pressure only in direct line with the bit and do not apply excessive
pressure. Bits can bend causing breakage or loss of control, resulting in personal
injury.
8.14.2 a) Additional items:
101) For diamond core drills: maximum diamond core bit diameter;
102) For tools with a maximum output torque greater than 100 Nm measured in accordance
with 19.102: instructions on how to brace the tool;
103) For applications which produce a considerable amount of dust, such as impact and
diamond core drilling: instruction on how to collect the dust.
9 Protection against access to live parts
This clause of Part 1 is applicable.
10 Starting
This clause of Part 1 is applicable.
11 Input and current
This clause of Part 1 is applicable.
12 Heating
This clause of Part 1 is applicable, except as follows:
12.2.1 Replacement:
© IEC 2021
Drills and impact drills are operated continuously until thermal equilibrium is reached with
the impact mechanism, if any, disengaged, while the torque applied to the spindle is 80 % of
the torque necessary to attain rated input or rated current.
12.5 Addition:
For impact drills, the temperature-rise limit specified for the external enclosure does not
apply to the enclosure of the impact mechanism.
13 Resistance to heat and fire
This clause of Part 1 is applicable.
14 Moisture resistance
This clause of Part 1 is applicable.
15 Resistance to rusting
This clause of Part 1 is applicable.
16 Overload protection of transformers and associated circuits
This clause of Part 1 is applicable.
17 Endurance
This clause of Part 1 is applicable, except as follows:
17.2 Replacement for impact drills:
An impact drill is operated intermittently with no-load and, if the impact mechanism can be
engaged and disengaged at will, the impact mechanism shall remain disengaged for 12 h at a
voltage equal to 1,1 times the highest rated voltage or 1,1 times the upper limit of the rated
voltage range and then for 12 h at a supply voltage equal to 0,9 times the lowest rated
voltage or 0,9 times the lower limit of the rated voltage range. The 12 h of operation need
not be continuous. The speed is adjusted to the highest value of the highest range.
Each cycle of operation comprises an “on” period of 100 s and an “off” period of 20 s, the “off”
periods being included in the specified operating time.
During the test, the tool is placed in three different positions, the operating time, at each
voltage, being approximately 4 h for each position.
NOTE 101 The change of position is made to prevent abnormal accumulation of carbon dust in any particular
place. Examples of the three positions are horizontal, vertically up and vertically down.
The same tool is then mounted vertically in a test apparatus. The apparatus is designed to
apply sufficient axial force to the tool, through a resilient medium that absorbs impacts and
vibration, to ensure steady operation of the impact mechanism. An example of a test
apparatus is shown in Figure 101. The tool is then operated at rated voltage for four periods
of 6 h each, the interval between these periods being at least 30 min; if the impact mechanism
can be engaged and disengaged at will, the impact mechanism shall remain engaged.

– 10 – IEC 62841-2-1:2017+AMD1:2021 CSV
© IEC 2021
During these tests, the tool is operated intermittently, each cycle comprising a period of
operation of 30 s and a rest period of 90 s during which the tool remains switched off.
The tool may be switched on and off by means of a switch other than that incorporated in the
tool.
During these tests, replacement of the carbon brushes is allowed, and the tool is oiled and
greased as in normal use. If mechanical failure occurs and does not impair compliance with
this standard, the part that failed may be replaced.
If the temperature rise of any part of the tool exceeds the temperature rise determined during
the test of 12.1, forced cooling or rest periods may be applied, the rest periods being
excluded from the specified operating time. If forced cooling is applied, it shall not alter the air
flow of the tool or redistribute carbon deposits.
During these tests, overload protection devices incorporated in the tool shall not activate.
NOTE 102 Monitoring of external temperatures will help avoid mechanical failures.
18 Abnormal operation
This clause of Part 1 is applicable, except as follows:
18.8 Replacement of Table 4:
Table 4 – Required performance levels
Type and purpose of SCF Minimum performance level
(PL)
Power switch – prevent unwanted switch-on for tools with M ≤ 25 Nm a
R,max
measured in accordance with 19.102
Power switch – prevent unwanted switch-on for tools with M > 25 Nm b
R,max
measured in accordance with 19.102
Power switch – provide desired switch-off for tools with M ≤ 25 Nm b
R,max
measured in accordance with 19.102
Power switch – provide desired switch-off for tools with M > 25 Nm c
R,max
measured in accordance with 19.102
Power switch – provide desired switch-off for tools that require bracing in Shall be evaluated using the
accordance with 8.14.1.101. fault conditions of 18.6.1 without
the loss of this SCF
Provide desired direction of rotation for tools that do not require bracing in Not an SCF
accordance with 8.14.1.101
Provide desired direction of rotation for tools that require bracing in
c
accordance with 8.14.1.101
Any electronic control to pass the test of 18.3 a
Prevent output speed from exceeding 130 % of rated no-load speed without a
accessories mounted
-1
For tools with a rated no-load speed of less than 3 500 min , prevent a
output speed from exceeding 150 % of rated no-load speed as measured in
19.6
-1
For tools with a rated no-load speed of 3 500 min or greater, prevent a
output speed from exceeding 130 % of rated no-load speed as measured in
19.6
Prevent exceeding thermal limits as in 18.4 a
Prevent self-resetting as required in 23.3 for tools with M ≤ 25 Nm a
R,max
measured in accordance with 19.102

© IEC 2021
Prevent self-resetting as required in 23.3 for tools with M > 25 Nm b
R,max
measured in accordance with 19.102
Limit the torque to comply with 19.102 c
Prevent unwanted lock-on of the power switch function for tools with b
M ≤ 25 Nm measured in accordance with 19.102
R,max
Prevent unwanted lock-on of the power switch function for tools with c
M > 25 Nm measured in accordance with 19.102
R,max
19 Mechanical hazards
This clause of Part 1 is applicable, except as follows:
19.1 Addition:
The test with probe B of IEC 61032:1997 does not apply to the chuck and any accessory that
may be inserted.
19.6 Replacement:
The no-load speed of the spindle at rated voltage shall not exceed 120 % of the rated no-
load speed.
Compliance is checked by measuring the speed of the spindle after the tool has been
operating for 5 min at no-load. During the test, separable accessories are not mounted.
19.101 Chuck keys shall be so designed that they drop out of position when released. This
requirement does not exclude the provision of clips for holding the key in place when not in
use; metal clips fixed to the flexible cable or cord are not allowed.
Compliance is checked by inspection and manual test.
The key is inserted in the chuck and, without tightening, the tool is turned such that the key is
facing down. The key shall fall out within 2 s.
19.102 Handles
19.102.1 General
The design of the handle(s) shall be such that the operator can control the static stalling
torque during the operation of the tool. Depending on the handle design, the stalling torque
shall not exceed the relevant maximum values as indicated in Figures 104 to 107.
Figure 102 illustrates, for various handle designs, the location “S” where the operator
naturally grasps the power switch. For power switch designs without a natural grasping
location, “S” shall indicate the least favourable position on the power switch for the
reactionary torque measurement. This location “S” is used in Figures 104 to 107 to determine
the moment arm for the torque calculation.
Figure 103 illustrates, for various auxiliary handle with flange designs, the location “F” where
the operator naturally grasps the handle at the flange. This location “F” is used in Figures 106
and 107 to determine the moment arm for the torque calculation.
Compliance is checked by the tests specified in 19.102.2 and 19.102.34 and by the
calculations in Figures 104 to 107.

– 12 – IEC 62841-2-1:2017+AMD1:2021 CSV
© IEC 2021
19.102.2 Test equipment
The test equipment used for the test of 19.102.34 shall meet the following requirements a) to
g):
a) The torque transducer and the rotational angle sensor shall continuously monitor the
torque and the rotation produced by the output spindle of the tool during the test of
19.102.34.
b) The output of the torque transducer shall be connected to an oscilloscope or other data
acquisition equipment capable of displaying the torque vs. time graph of the tool’s output
during the test of 19.102.34.
c) The torque transducer shall be rated to measure a torque of at least 150 % of the static
stalling torque of the tool or slip torque of an overload clutch (M ) with a measurement
R
accuracy of ±1 %.
d) The rotational angle shall be measured with an accuracy of ±2°.
e) The data acquisition equipment used for measuring the torque signal during the test shall
have a sampling rate of at least 15 kHz, but the bandwidth shall be limited by a first order
low pass filter with a cut-off frequency of (1 ± 0,1) kHz to minimise the effect of transients.
f) The joint that is connected to the tool during the test shall be capable of stalling the tool
over a rotational angle of 30° to 60°. The joint that fulfils this requirement shall be a
torsional element or other such device that remains in equilibrium during the test.
g) A regulated power supply that is connected to the tool during the test shall be capable of
providing the rated voltage and rated frequency provided on the tool’s nameplate (e.g.
120 V AC, 60 Hz). It shall also be suitably sized such that the voltage drop during the test
shall not deviate from the rated voltage or the upper limit of the rated voltage range by
more than 7 %.
Compliance is checked by inspection and by measurement.
19.102.3 Assessment to determine tool configuration
This assessment is only applicable for tools that employ an electronic circuit(s) that affects
the output torque in the test of 19.102.4.
Prior to each measurement, the sample is operated for at least 5 min at no-load. After each
5 min operation period, the measurement shall be conducted within 20 min.
All measurements are made with the tool sample running in the forward position.
The sample is connected to the measurement fixture and is fixed during the test.
For tools with a soft start function, the test of 19.102.4 through steps 1) and 2) is conducted
on the sample with the soft start function enabled and then repeated with the soft start
function disabled. If analysis shows that the tool will not operate with the soft start function
disabled, then the test with the soft start function disabled is not conducted. For tools
employing electronically commutated motors, the configuration that results in the greatest
output torque shall be used for the test of 19.102.4. For tools other than those employing
electronically commutated motors, the configuration that results in the greatest output torque
shall be used for the following test.
For tools other than those employing electronically commutated motors, when all functions
affecting the test value of the output torque, except for any soft start function, are not
evaluated as SCFs according to 18.8 (e.g. current limit and stall detection), the tool
configuration for the test of 19.102.4 shall be the configuration that results in the greatest
output torque for one trial of the test of 19.102.4 through steps 1) and 2) as specified below:
– all functions affecting the output torque enabled; or

© IEC 2021
– each function not evaluated as an SCF affecting the output torque disabled one at a time.
19.102.34 Test procedure
If applicable, the sample is configured as specified in 19.102.3.
Prior to the test, the sample is operated for at least 5 min at no-load. After the 5 min operation
period, the test shall be conducted within 20 min.
All measurements are made with the tool sample running in the forward position.
The sample is connected to the measurement fixture and is fixed during the test. The
measurement is conducted by using seven trial measurements of the same sample, each trial
conducted as follows:
1) Energize the tool to the full "on" position as quickly as possible and allow the joint to be
tightened until it comes to a complete stop.
2) Record the measured output torque.
a) For tools without a mechanical overload clutch, the output torque is determined by
either i) or ii):
i) For signals that are stable for a minimum of 2 ms after the initial peak (if present),
the output torque value is determined by measuring over the stable region for an
interval T not exceeding 100 ms. If there is variation during this interval, the
average value shall be used. See Figure 108.
ii) For signals that are not stable for a minimum of 2 ms after the initial peak, the
output torque value shall be the r.m.s. RMS value of the signal over the rotation
from off until peak torque is achieved. See Figure 109.
If the tool employs an electronic circuit(s) that affects the output torque in the above
test, the output torque shall be either:
– when all functions affecting the output torque are considered SCFs and are
evaluated according to 18.8, the applicable value of i) or ii) above with all functions
affecting the output torque enabled; or
– when all functions affecting the output torque are not evaluated as SCFs according
to 18.8, the greatest applicable value of i) or ii) above with
• all functions affecting the output torque enabled;
• each function affecting the output torque disabled, tested for one trial. If the
output torque is greater than the value with all functions enabled, the test
resulting in the greatest output torque value is conducted for an additional two
trials, where each trial may use a new sample.
NOTE 1 101 Torque signals can exhibit a transient peak with a relatively stable signal following the peak.
The stable signal can exhibit relatively slow change due to, for example, heating of the windings. The
stable signal can also exhibit periodic signal variation due to torque ripple. Averaging over this stable
period provides a meaningful torque value. The transient peak and the stable region are not always
present.
b) For tools with a mechanical overload clutch:
The output torque is determined by the peak value of the first peak that occurs after
starting the trial. Later peaks, even if they appear to have greater values, are not taken
into account. See Figure 110.
3) Before the next trial, disconnect the spindle from the test fixture and operate the tool
under no-load for a minimum of 3 s. Allow the tool to cool for a minimum of 2 min before
the next trial.
M is computed as the average of five of the measurements from each of the seven trials,
R
with the highest and lowest measurement eliminated. The standard deviation of the five
measurements shall also be computed and shall be less than 5 %. If it is not, then the fixture
shall be adjusted to achieve the required repeatability. In cases where an electronic circuit

– 14 – IEC 62841-2-1:2017+AMD1:2021 CSV
© IEC 2021
that affects the torque is disabled, M is computed as an average of the three trials in
R
19.102.3, item 2) a), last bullet.
NOTE 2 102 It is recognized that disabling functions that affect the torque can result in a test where the tool is
permanently impaired after the test.

20 Mechanical strength
This clause of Part 1 is applicable.
21 Construction
This clause of Part 1 is applicable, except as follows:
21.18.1.1 Addition:
Tools with a maximum output torque greater than 100 Nm shall not be provided with a lock-on
device.
Compliance is checked by measurement in accordance with 19.102 and inspection.
For tools with a maximum output torque of 100 Nm or less, a power switch lock-on device, if
any, shall be located outside the grasping area, or so designed that it is not likely to be
unintentionally locked on by the user’s hand during intended left- or right-handed operation.
This grasping area is considered to be the contact area between either hand and the tool
while the index finger of that hand is resting on the power switch actuator of the tool.
Compliance is checked by inspection or, for a power switch with a lock-on device within the
grasping area, by the following test.
With the power switch in the “on” position, the lock-on device shall not be actuated by a
straight edge 25 mm long when the straight edge is pushed down on the lock-on device. The
straight edge shall be oriented in any direction and shall be applied to bridge the surface of
the lock-on device and any surface adjacent to the lock-on device.
21.18.1.2 This subclause of Part 1 is not applicable.
21.35 This subclause is not applicable.
NOTE 101 Dust collection is covered in 8.14.2 a) 103).
22 Internal wiring
This clause of Part 1 is applicable.
23 Components
This clause of Part 1 is applicable, except as follows:
23.3 Replacement of the first paragraph:
Protection devices or circuits shall be of the non-self-resetting type unless the tool is
equipped with a momentary power switch with no provision for being locked in the “on”
position.
© IEC 2021
24 Supply connection and external flexible cords
This clause of Part 1 is applicable.
25 Terminals for external conductors
This clause of Part 1 is applicable.
26 Provision for earthing
This clause of Part 1 is applicable.
27 Screws and connections
This clause of Part 1 is applicable.
28 Creepage distances, clearances and distances through insulation
This clause of Part 1 is applicable.

– 16 – I
...

SLOVENSKI STANDARD
01-februar-2001
Electricity metering - Data exchange for meter reading, tariff and load control - Part
41: Data exchange using wide area networks: Public switched telephone network
(PSTN) with LINK+ protocol
Electricity metering - Data exchange for meter reading, tariff and load control - Part 41:
Data exchange using wide area networks: Public switched telephone network (PSTN)
with LINK+ protocol
Comptage de l'électricité - Echange de données pour la lecture des compteurs, le
contrôle des tarifs et de la charge - Partie 41: Echange de données sur réseaux larges:
Réseau téléphonique public commuté (RTPC) avec protocole LIAISON+
Ta slovenski standard je istoveten z: IEC/TS 62056-41
ICS:
17.220.20 0HUMHQMHHOHNWULþQLKLQ Measurement of electrical
PDJQHWQLKYHOLþLQ and magnetic quantities
33.040.40 Podatkovna komunikacijska Data communication
omrežja networks
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

SIST IEC/TR2 62056-41:200
...