IEC 62841-2-3:2020/AMD1:2024

IEC 62841-2-3 ®
Edition 1.0 2024-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Electric motor-operated hand-held tools, transportable tools and lawn and
garden machinery – Safety –
Part 2-3: Particular requirements for hand-held grinders, disc-type polishers and
disc-type sanders
Outils électroportatifs à moteur, outils portables et machines pour jardins et
pelouses – Sécurité –
Partie 2-3: Exigences particulières pour les meuleuses portatives et pour les
lustreuses et ponceuses portatives du type à disque
IEC 62841-2-3:2020-04/AMD1:2024-10(en-fr)

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IEC 62841-2-3 ®
Edition 1.0 2024-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Electric motor-operated hand-held tools, transportable tools and lawn and

garden machinery – Safety –
Part 2-3: Particular requirements for hand-held grinders, disc-type polishers and

disc-type sanders
Outils électroportatifs à moteur, outils portables et machines pour jardins et

pelouses – Sécurité –
Partie 2-3: Exigences particulières pour les meuleuses portatives et pour les

lustreuses et ponceuses portatives du type à disque

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.140.20  ISBN 978-2-8322-9736-0

– 2 – IEC 62841-2-3:2020/AMD1:2024
© IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRIC MOTOR-OPERATED HAND-HELD TOOLS, TRANSPORTABLE
TOOLS AND LAWN AND GARDEN MACHINERY – SAFETY –

Part 2-3: Particular requirements for hand-held grinders,
disc-type polishers and disc-type sanders

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.
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) 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 62841-2-3:2020 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
116/813/FDIS 116/832/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
© IEC 2024
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/.
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.
___________
1 Scope
Replace the existing text of Clause 1 with the following new text:
This clause of Part 1 is applicable, except as follows:
Addition:
This document applies to hand-held grinders, disc-type polishers and disc-type sanders,
including angle, straight and vertical tools, intended for use on various materials except
magnesium, with a rated capacity not exceeding 230 mm. For grinders, the rated no-load
speed does not exceed a peripheral speed of the accessory of 80 m/s at rated capacity.
This document also applies to concrete surface grinders for use on various masonry materials
with a rated capacity not exceeding 230 mm.
This document does not apply to grinders intended to be fitted with an accessory other than
a bonded abrasive product or a diamond wheel.
This document does not apply to grinders intended to be fitted with diamond wheels with
– peripheral gaps exceeding 10 mm; or
– a positive rake angle.
This document does not apply to dedicated cut-off machines.
NOTE 101 It is planned that a document on cut-off machines will be published.
This document does not apply to orbital polishers and orbital sanders.
NOTE 102 Orbital polishers and orbital sanders are covered by IEC 62841-2-4.
This document does not apply to die grinders.
NOTE 103 It is planned that a document on die grinders will be published.

– 4 – IEC 62841-2-3:2020/AMD1:2024
© IEC 2024
2 Normative references
Replace the existing text of Clause 2 with the following new text:
This clause of Part 1 is applicable, except as follows:
Addition:
ISO 525:2020, Bonded abrasive products – Shape types, designation and marking
3 Terms and definitions
Add the following new entry:
3.106.4
concrete surface grinder
grinder intended for facial grinding with a diamond grinding wheel and not intended for other
grinding or cut-off operations
Note 101 to entry: See Figure 116.

Figure 116 – Example of a concrete surface grinder
8 Marking and instructions
Add the following new subclause before 8.6:
8.4 Modification:
The marking specified in 8.2.101 may be located on a Type B wheel guard that is a detachable
part.
© IEC 2024
Replace the existing text of 8.6 with the following new text:
8.6 Addition:
linear dimension . mm
always operate with two hands
do not use this type of guard for cut-off operations

Add the following new subclause before 8.14.1.101:
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".
In these safety instructions, terms such as grinding or grinder, sanding or sander, concrete
surface grinder or concrete surface grinding, wire brushing or wire brush, polishing or polisher,
or cutting-off or cut-off tool are selected as specified by the manufacturer. These terms in the
warnings and headings shall be consistently used or deleted based on the selected operations.
The "and"/"or" conjunctions may be used as appropriate.
If the power tool is intended only for one of the listed operations, the heading of that section is
to be used for all warnings. Grinding and cutting off shall be included for angle grinders with
a rated capacity exceeding 55 mm.
Replace the existing text of 8.14.1.101 with the following new text:
8.14.1.101 Safety warnings for grinders, disc-type polishers and disc-type sanders
1) Safety instructions for all operations
Safety warnings common for grinding, sanding, concrete surface grinding, wire
brushing, polishing or cutting-off operations:
NOTE 101 In the above heading, those operations not applicable are omitted.
a) This power tool is intended to function as a grinder, sander, wire brush, polisher,
hole cutter or cut-off tool. Read all safety warnings, instructions, illustrations and
specifications provided with this power tool. Failure to follow all instructions listed
below may result in electric shock, fire and/or serious injury.
NOTE 102 Only the applicable operations are listed in item 1) a) above.
b) Operations such as grinding, sanding, wire brushing, polishing, hole cutting or
cutting-off are not to be performed with this power tool. Operations for which the
power tool was not designed may create a hazard and cause personal injury.
NOTE 103 Only those operations that were not included in item 1) a) above are listed in item 1) b) above.
If all listed operations are intended, then the warning in item 1) b) above is omitted, but all subsequent
warnings are given without exclusion.

– 6 – IEC 62841-2-3:2020/AMD1:2024
© IEC 2024
c) Do not convert this power tool to operate in a way which is not specifically
designed and specified by the tool manufacturer. Such a conversion may result in a
loss of control and cause serious personal injury.
d) Do not use accessories which are not specifically designed and specified by the
tool manufacturer. Just because the accessory can be attached to your power tool, it
does not assure safe operation.
e) The rated speed of the accessory must be at least equal to the maximum speed
marked on the power tool. Accessories running faster than their rated speed can break
and fly apart.
f) The outside diameter and the thickness of your accessory must be within the
capacity rating of your power tool. Incorrectly sized accessories cannot be adequately
guarded or controlled.
g) The dimensions of the accessory mounting must fit the dimensions of the
mounting hardware of the power tool. Accessories that do not match the mounting
hardware of the power tool will run out of balance, vibrate excessively and may cause
loss of control.
h) Do not use a damaged accessory. Before each use inspect the accessory such as
abrasive wheels for chips and cracks, backing pad for cracks, tear or excess wear,
wire brush for loose or cracked wires. If power tool or accessory is dropped,
inspect for damage or install an undamaged accessory. After inspecting and
installing an accessory, position yourself and bystanders away from the plane of
the rotating accessory and run the power tool at maximum no-load speed. If
unusual vibration is detected, turn the power tool off immediately and replace the
cut-off wheel. If unusual vibration is not detected, continue to run the power tool
for one minute. Damaged accessories will normally break apart during this test time.
i) Wear personal protective equipment. Use safety glasses, and, depending on the
application, a face shield. As appropriate, wear breathing protection, such as a
dust mask or respirator, hearing protection, gloves and workshop apron capable
of stopping small abrasive or workpiece fragments. The eye protection must be
capable of stopping flying debris generated by various applications. The dust mask or
respirator must be capable of filtering particles generated by the particular application.
Prolonged exposure to high intensity noise may cause hearing loss.
j) Keep bystanders a safe distance away from work area. Anyone entering the work
area must wear personal protective equipment. Fragments of workpiece or of a
broken accessory may fly away and cause injury beyond immediate area of operation.
k) Hold the power tool by insulated gripping surfaces only, 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 104 The warning in item 1) k) above is omitted if polishing or sanding are the only intended
operations.
l) Position the cord clear of the spinning accessory. If you lose control, the cord may
be cut or snagged and your hand or arm may be pulled into the spinning accessory.
m) Never lay the power tool down until the accessory has come to a complete stop.
The spinning accessory may grab the surface and pull the power tool out of your control.
n) Do not run the power tool while carrying it at your side. Accidental contact with the
spinning accessory could snag your clothing, pulling the accessory into your body.
o) Regularly clean the power tool’s air vents. The motor’s fan will draw the dust inside
the housing and excessive accumulation of powdered metal may cause electrical
hazards.
p) Do not operate the power tool near flammable materials. Sparks could ignite these
materials.
© IEC 2024
q) Do not use accessories that require liquid coolants. Using water or other liquid
coolants may result in electrocution or shock.
NOTE 105 The warning in item 1) q) above does not apply for power tools specifically designed for use
with a liquid system.
2) Further safety instructions for all operations
Kickback and related warnings
Kickback is a sudden reaction to a pinched or snagged rotating wheel, backing pad, brush
or any other accessory. Pinching or snagging causes rapid stalling of the rotating accessory
which in turn causes the uncontrolled power tool to be forced in the direction opposite of the
accessory’s rotation at the point of the binding.
For example, if an abrasive wheel is snagged or pinched by the workpiece, the edge of the
wheel that is entering into the pinch point can dig into the surface of the material causing
the wheel to climb out or kick out. The wheel may either jump toward or away from the
operator, depending on direction of the wheel’s movement at the point of pinching. Abrasive
wheels may also break under these conditions.
Kickback is the result of power tool misuse and/or incorrect operating procedures or
conditions and can be avoided by taking proper precautions as given below.
a) Maintain a firm grip with both hands on the power tool and position your body and
arms to allow you to resist kickback forces. Always use auxiliary handle, if
provided, for maximum control over kickback or torque reaction during start-up.
The operator can control torque reactions or kickback forces, if proper precautions are
taken.
b) Never place your hand near the rotating accessory. Accessory may kickback over
your hand.
c) Do not position your body in the area where power tool will move if kickback
occurs. Kickback will propel the tool in direction opposite to the wheel’s movement at
the point of snagging.
d) Use special care when working corners, sharp edges, etc. Avoid bouncing and
snagging the accessory. Corners, sharp edges or bouncing have a tendency to snag
the rotating accessory and cause loss of control or kickback.
e) Do not attach a saw chain woodcarving blade, segmented diamond wheel with a
peripheral gap greater than 10 mm or toothed saw blade. Such blades create
frequent kickback and loss of control.
3) Additional safety instructions for grinding and cutting-off operations
NOTE 106 If grinding and cutting-off operations are not Intended by the manufacturer, all of the verbatim text
in item 3) below is omitted.
Safety warnings specific for grinding and cutting-off operations
a) Use only wheel types that are specified for your power tool and the specific guard
designed for the selected wheel. Wheels for which the power tool was not designed
cannot be adequately guarded and are unsafe.
b) The grinding surface of centre depressed wheels must be mounted below the plane
of the guard lip. An improperly mounted wheel that projects through the plane of the
guard lip cannot be adequately protected.
c) The guard must be securely attached to the power tool and positioned for
maximum safety, so the least amount of wheel is exposed towards the operator.
The guard helps to protect the operator from broken wheel fragments, accidental contact
with wheel and sparks that could ignite clothing.
NOTE 107 The warning in item 3) c) above is omitted for grinders with a rated capacity of less than
55 mm.
d) Wheels must be used only for specified applications. For example: do not grind
with the side of cut-off wheel. Abrasive cut-off wheels are intended for peripheral
grinding, side forces applied to these wheels may cause them to shatter.

– 8 – IEC 62841-2-3:2020/AMD1:2024
© IEC 2024
e) Always use undamaged wheel flanges that are of correct size and shape for your
selected wheel. Proper wheel flanges support the wheel thus reducing the possibility of
wheel breakage. Flanges for cut-off wheels may be different from grinding wheel flanges.
f) Do not use worn down wheels from larger power tools. A wheel intended for larger
power tool is not suitable for the higher speed of a smaller tool and may burst.
NOTE 108 The warning in item 3) f) above does not apply for tools only designated to be used with
diamond wheels.
g) When using dual purpose wheels always use the correct guard for the application
being performed. Failure to use the correct guard may not provide the desired level of
guarding, which could lead to serious injury.
4) Additional safety instructions for cutting-off operations
NOTE 109 If cutting-off operation is not intended by the manufacturer, all of the verbatim text in item 4) below
is omitted.
Additional safety warnings specific for cutting-off operations:
a) Do not "jam" the cut-off wheel or apply excessive pressure. Do not attempt to make
an excessive depth of cut. Overstressing the wheel increases the loading and
susceptibility to twisting or binding of the wheel in the cut and the possibility of kickback
or wheel breakage.
b) Do not position your body in line with and behind the rotating wheel. When the
wheel, at the point of operation, is moving away from your body, the possible kickback
may propel the spinning wheel and the power tool directly at you.
c) When the wheel is binding or when interrupting a cut for any reason, switch off
the power tool and hold it motionless until the wheel comes to a complete stop.
Never attempt to remove the cut-off wheel from the cut while the wheel is in motion
otherwise kickback may occur. Investigate and take corrective action to eliminate the
cause of wheel binding.
d) Do not restart the cutting operation in the workpiece. Let the wheel reach full speed
and carefully re-enter the cut. The wheel may bind, walk up or kickback if the power
tool is restarted in the workpiece.
e) Support panels or any oversized workpiece to minimize the risk of wheel pinching
and kickback. Large workpieces tend to sag under their own weight. Supports must be
placed under the workpiece near the line of cut and near the edge of the workpiece on
both sides of the wheel.
f) Use extra caution when making a "pocket cut" into existing walls or other blind
areas. The protruding wheel may cut hidden objects that can cause kickback.
g) Do not attempt to do curved cutting. Overstressing the wheel increases the loading
and susceptibility to twisting or binding of the wheel in the cut and the possibility of
kickback or wheel breakage, which can lead to serious injury.
5) Additional safety instructions for sanding operations
NOTE 110 If sanding operation is not intended by the manufacturer, all of the verbatim text in item 5) below is
omitted.
Safety warnings specific for sanding operations:
a) Use proper sized sanding disc paper. Follow the manufacturer's recommendations
when selecting sanding paper. Larger sanding paper extending too far beyond the
sanding pad presents a laceration hazard and may cause snagging, tearing of the disc
or kickback.
© IEC 2024
6) Additional safety instructions for polishing operations
NOTE 111 If polishing operation is not intended by the manufacturer, all of the verbatim text in item 6) below
is omitted.
Safety warnings specific for polishing operations:
a) Do not allow any loose portion of the polishing bonnet or its attachment strings to
spin freely. Tuck away or trim any loose attachment strings. Loose and spinning
attachment strings can entangle your fingers or snag on the workpiece.
7) Additional safety instructions for wire brushing operations
NOTE 112 If wire brushing operation is not intended by the manufacturer, all of the verbatim text in item 7)
below is omitted.
Safety warnings specific for wire brushing operations:
a) Be aware that wire bristles are thrown by the brush even during ordinary operation.
Do not overstress the wires by applying excessive load to the brush. The wire
bristles can easily penetrate light clothing and/or skin.
b) If the use of a guard is specified for wire brushing, do not allow any interference
of the wire wheel or brush with the guard. Wire wheel or brush may expand in
diameter due to work load and centrifugal forces.
Delete existing subclauses 8.14.1.101.1 to 8.14.1.101.8.
Replace the existing text of 8.14.2 a) 105) with the following new text:
105) Information about the maximum diameter of wheel-type wire brushes;
Replace the existing text of 8.14.2 a) 106) with the following new text:
106) Information about the permitted construction of cutting-off wheels (diamond cutting
wheel or bonded reinforced wheel), including the permitted wheel diameter and
thickness. If a diamond cutting wheel is segmented, instruction that the maximum
peripheral gap between segments is 10 mm with no positive rake angle.
NOTE 101 An example of a segmented diamond cutting wheel construction is shown in Figure 104.

– 10 – IEC 62841-2-3:2020/AMD1:2024
© IEC 2024
Replace the existing Figure 104 with the following new Figure 104:
Dimensions in millimetres
Key
1 direction of rotation 5 positive rake angle
2 gap 6 line tangent to the periphery of the diamond cutting wheel and
perpendicular to the centreline of the diamond cutting wheel and
gap
3 leading tip of segment 7 centreline of the diamond cutting wheel and gap
4 negative rake angle
Figure 104 – Examples of segmented diamond cutting wheel constructions

© IEC 2024
18 Abnormal operation
Replace the existing text of the eleventh row of Table 4 with the following new text:
Prevent exceeding thermal limits as in 18.4 and 18.5.3 a

19 Mechanical hazards
Replace the existing text of 19.1 with the following new text:
19.1 Replacement of the first and second paragraph:
Moving and other dangerous parts other than the spindle, the accessory and the flanges shall
be so positioned or enclosed to provide adequate protection against personal injury. The
guarding of the accessory is covered by 19.101.
Protective enclosures, covers, guards and the like shall have adequate mechanical strength
for their intended purpose. Except for the wheel guard as required by 19.101.2, they shall not
be removable without the aid of a tool.
Replace the existing text of the second dash of 19.101.2 with the following new text:
– a wheel guard of Type B (grinding) and additional elements that can be fixed to the wheel
guard Type B (grinding) in order to convert it into a wheel guard of Type A (cut-off); or
Add the following new paragraph before the last paragraph of 19.101.2:
Concrete surface grinders shall be supplied with a Type E wheel guard.
Replace the existing text of the second row of Table 101 with the following new text:
Wheel type 1, 4 Type G
(straight grinder wheel guard)
Peripheral grinding
Cones, plugs None
Replace the existing text of the third paragraph of 19.103 with the following new text:
Flanges are not required to be provided if the tool is designed to only accept wheels with
– a non-reusable plate mount or other non-threaded mounting affixed to the wheel, provided
the requirements of 19.106 are fulfilled; or
– threaded inserts or projecting studs.
Replace the existing text of 19.104.1 with the following new text:
19.104.1 Flanges required by 19.103 shall be designed so that they secure and locate the
abrasive products to the grinder. At least one of the flanges shall be keyed, screwed, shrunk-
on or otherwise secured to prevent rotation relative to the tool spindle.
The flanges shall be flat and have no sharp edges.
The flanges shall have the dimensions specified in 19.104.2 and 19.104.3 as illustrated in
Figure 105 or the dimensions specified in 19.104.4 as illustrated in Figure 106, where D is the
outside diameter of the abrasive wheel, G and W are the dimensions of the recess and D is the
f
outside diameter of the flange clamping surface.

– 12 – IEC 62841-2-3:2020/AMD1:2024
© IEC 2024
Flanges for wheels under 55 mm diameter may be unrecessed.
The inner flange and the outer flange shall have the same diameter D or the overlap of the
f
inner flange and outer flange bearing surfaces shall be at least equal to dimension C.
In order to prevent interference, the outer flange and/or nut shall not extend beyond the plane
defined by the lip of the wheel guard when mounted with the thickest Type 27, 28 or 29 wheel
as specified in accordance with 8.14.2 a) 104).
Compliance is checked by inspection and by measurement.
Add the following new paragraph after the fourth paragraph of 19.104.2:
Compliance is checked by measurement.
Replace the existing text of the second paragraph of NOTE 101 of 19.104.2 with the following
new text:
For wheel types 27, 28 and 42: The outer dimensions of the outer flange shall be limited so that there is no
interference with the depressed centre of wheels in accordance with ISO 603-14:2022 and ISO 603-16:2022 as
illustrated in Figure Z101 with the dimensions ØK, R and F as specified in Table Z101.
Add the following new paragraph after the second paragraph of 19.104.3:
Compliance is checked by inspection and by measurement.
Replace the existing text of the second paragraph of 19.104.4 (below Table 102) with the
following new text:
Compliance is checked by measurement.
Replace the existing text of the third paragraph of 19.105 with the following new text:
The grinder is fitted with a steel disc having any one of the thicknesses between the flange
clamping surfaces of the abrasive product specified in accordance with 8.14.2 a) 104) or
8.14.2 a) 106), as applicable.
Add the following new subclause:
19.106 A non-reusable plate mount or other non-threaded mounting affixed to the wheel in
accordance with 19.103, if any, shall be designed in such a manner as to ensure that there is
no damage to the mounting means under a stalled condition.
Compliance is checked by inspection and by the following test.
The tool is fitted with a steel test disc with
– a thickness of at least 2 mm, except as needed to be compatible with the tool mounting
means; and
– the largest diameter in accordance with 8.14.2 a) 101); and
– an attachment point which may be a hole or other means located at a radial distance of
(20 ± 1) mm from the outer periphery of the steel test disc for applying the test forces.

© IEC 2024
The tool spindle is locked during the application of the test forces. A force in N equal to 1,1 times
the diameter of the steel disc in mm is applied to the attachment point in a direction
– tangential to the periphery of the steel disc for 1 min; and
– perpendicular to the plane of the steel disc for 1 min.
The tool is then operated at no-load for 30 s. During the test, the steel test disc shall not
disengage from the tool mounting. After the test, the tool mounting shall not be damaged.
20 Mechanical strength
Replace the existing text of the second paragraph of 20.101.1 with the following new text:
Compliance is checked by subjecting three samples of each wheel guard type to the test
specified in 20.101.2 to 20.101.5. At the manufacturer’s discretion, the test may be conducted
with less than three separate grinders for each wheel guard type.
Replace the existing text of the first paragraph of 20.101.5 with the following new text:
20.101.5 While monitoring the wheel speed with a tachometer, the speed of the tool is
gradually increased until 90 % of the rated no-load speed of the grinder is achieved.
Replace the existing text of the last paragraph of 20.101.6 with the following new text:
If the wheel guard has failed any of the requirements in b) to d) above at a wheel burst speed
that is above the speed specified in 20.101.5, the test shall be repeated using the method of
increasing the length of the pre-cut segments.
Replace the existing text of the first paragraph of 20.102.3 with the following new text:
20.102.3 The wheel as specified in 20.102.2 is notched into four equal segments (quadrants).
The cut is directed from the outer edge radially towards the centre (see Figure 108). The width
of each notch shall not exceed 2,5 mm. The extent of the notches shall allow for the centrifugal
forces to cause the wheel to disintegrate at 90 % of the rated no-load speed of the grinder.
Replace the existing text of the first paragraph of 20.102.5 with the following new text:
20.102.5 While monitoring the wheel speed with a tachometer, the speed of the tool is
gradually increased until 90 % of the rated no-load speed of the grinder is achieved.
Replace the existing text of 20.103.4 with the following new text:
20.103.4 While monitoring the wheel speed with a tachometer, the speed of the tool is
of the grinder is achieved. If the
gradually increased until 90 % of the rated no-load speed
wheel does not disintegrate at this specified speed, stop the grinder, increase the length of the
pre-cuts and repeat the test above until the wheel disintegrates. At the manufacturer’s option,
in place of stopping the grinder and increasing the length of the pre-cut segments, the wheel
speed can be increased beyond the specified speed in order to cause the wheel to disintegrate.
NOTE 101 Typically, the wheel will burst within 5 min.
Replace the existing text of item a) of 20.103.5 with the following new text:
a) the speed of the wheel just prior to the wheel bursting is at least 90 % of the rated no-load
speed;
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© IEC 2024
21 Construction
Replace the existing text of the first paragraph of 21.18.1.1 with the following new text:
For tools that are required to be fitted with a momentary power switch in accordance with
21.18.1, a lock-on device is allowed provided that two dissimilar actions are necessary to lock
the power switch in the “on” position. In addition, only a single motion to the switch shall be
required to automatically return to the “off” position.
Replace the existing text of the first line of the third paragraph of 21.18.1.1 (below the NOTE)
with the following new text:
For mains-operated grinders, either
Replace the existing text of the fourth paragraph of 21.18.1.1 with the following new text:
Compliance is checked by inspection, by manual test and for mains-operated grinders
incorporating a lock-on device, by the following test.
Replace the existing text of 21.18.1.2 with the following new text:
21.18.1.2 Replacement:
For grinders and disc-type sanders with a rated capacity greater than 55 mm, power
switches shall be so located or designed that inadvertent operation is unlikely to occur during
lifting, carrying or when the tool is resting on a flat surface.
For all tools,
– it shall not be possible to start the tool when a sphere with a diameter of (100 ± 1) mm is
applied to the power switch perpendicularly to the tool’s surface where the switch is
mounted with a lock off device engaged, if any; and
either
– the gripping length L of the grasping surface identified in accordance with 8.14.2 b) 6)
immediately in front of or behind the power switch actuating member shall be a minimum
of 70 mm. This length L includes
• the straight line distance of any portion of the grasping surface that is straight or curved
at a radius of greater than 100 mm; plus
• the straight line distance of the length(s) A where the radius of the grasping surface is
10 mm to 100 mm, but each length A shall not exceed 10 mm. See Figures 113 and 114.
If there are finger grips or similar superimposed profiles, the radius of the grasping surface
shall not be measured along the surface, but only the arc(s) or straight line distance of the
grasping surface, as applicable, shall be taken into account. See Figure 115;
or
– if the tool has a gripping length L less than 70 mm, it shall be provided with a lock-off device,
where
• two separate and dissimilar actions shall be necessary before the motor is switched on
(e.g. a power switch which needs to be pushed in before it can be moved laterally to
close the contacts to start the motor); and
• it shall not be possible to achieve these two actions with a single grasping motion or a
straight line motion; and
© IEC 2024
• the lock-off device shall not be activated when the tool is in a stable resting position on
a flat surface such that the power switch actuator is facing upwards.
Compliance is checked by inspection and by manual test.
24 Supply connection and external flexible cords
Replace the existing text of 24.4 with the following new text:
24.4 Addition:
For angle grinders and vertical grinders with a rated capacity greater than 155 mm and for
straight grinders with a rated capacity greater than 130 mm, the supply cords shall be not
lighter than heavy polychloroprene-sheathed flexible cable (code designation 60245 IEC 66) or
equivalent.
NOTE 101 In Europe (EN 62841-2-3), the following conditions apply:
For tools with a rated capacity greater than 155 mm, the supply cord shall be not lighter than heavy polychloroprene
or PUR sheathed flexible cord (code designation 60245 IEC 66, H07RN-F or H07BQ-F) or equivalent.
NOTE 102 In the United States of America, the following conditions apply:
For tools with a rated capacity greater than 155 mm, the supply cords shall be oil, weather and water resistant
hard service cord in accordance with the National Electrical Code, NFPA 70, such as SOOW or STOOW,
Attachment plugs and supply cords shall be equal to or greater than the rating of the tool.
NOTE 103 In Canada, the following conditions apply:
For tools with a rated capacity greater than 155 mm, the supply cords shall be oil, weather and water resistant
extra hard usage cord in accordance with the Canadian Electrical Code, Part 1, such as SOOW or STOOW.
Attachment plugs and supply cords shall be equal to or greater than the rating of the tool.
Annex I – Measurement of noise and vibration emissions
Replace the existing text of I.2.4 with the following new text:
I.2.4 Installation and mounting conditions of the power tools during noise tests
Addition:
Angle grinders that are used for grinding and cut-off operations are suspended and fitted with
an artificial wheel equivalent to the rated capacity as specified in Figure I.104 and Table I.102
for the application “grinding”. Straight grinders are suspended and fitted with an artificial wheel
equivalent to the rated capacity as specified in Figure I.106 and Table I.105. Disc-type
polishers are suspended and fitted with a lambswool polishing pad of rated capacity. Disc-
type sanders are suspended and fitted with a sanding disc of rated capacity. For angle and
vertical tools, the wheel or pad shall be horizontal. For straight tools, the wheel or pad shall be
vertical. Tools for other applications are fitted with the most unfavourable accessory in
accordance with 8.14.2 a) 101).
Replace the existing text of I.2.5 with the following new text:
I.2.5 Operating conditions
Addition:
The temperature requirements of 5.6 are not applicable.

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© IEC 2024
Grinders are tested at no-load. Disc-type polishers are tested under load as specified in
Table I.106. Disc-type sanders are tested under load as specified in Table I.107.
Add the following new subclause before I.3.5.3:
I.3.5.1 General
Addition:
For battery operated tools, the tests are conducted with the lightest battery in accordance with
IEC 62841-1:2014, K.8.14.2 e) 2) that has sufficient capacity to operate the tool at no load, with
the artificial wheel mounted, for at least 25 min.
Replace the existing Table I.101 with the following new Table I.101:
Table I.101 – Test conditions for angle grinding and concrete grinding
Orientation Tool to be held as in normal use for grinding a horizo
...