IEC 62841-3-7:2020

IEC 62841-3-7 ®
Edition 1.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electric motor-operated hand-held tools, transportable tools and lawn and
garden machinery – Safety –
Part 3-7: Particular requirements for transportable wall saws

Outils électroportatifs à moteur, outils portables et machines pour jardins et
pelouses – Sécurité –
Partie 3-7: Exigences particulières pour les scies murales portables

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IEC 62841-3-7 ®
Edition 1.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electric motor-operated hand-held tools, transportable tools and lawn and

garden machinery – Safety –
Part 3-7: Particular requirements for transportable wall saws

Outils électroportatifs à moteur, outils portables et machines pour jardins et

pelouses – Sécurité –
Partie 3-7: Exigences particulières pour les scies murales portables

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.140.20 ISBN 978-2-8322-8443-8

– 2 – IEC 62841-3-7:2020 © IEC 2020
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 General requirements . 9
5 General conditions for the tests . 9
6 Radiation, toxicity and similar hazards . 9
7 Classification . 9
8 Marking and instructions . 10
9 Protection against access to live parts . 12
10 Starting . 12
11 Input and current . 12
12 Heating . 12
13 Resistance to heat and fire . 12
14 Moisture resistance . 12
15 Resistance to rusting . 15
16 Overload protection of transformers and associated circuits . 15
17 Endurance . 15
18 Abnormal operation . 15
19 Mechanical hazards . 16
20 Mechanical strength . 18
21 Construction . 19
22 Internal wiring . 20
23 Components . 20
24 Supply connection and external flexible cords . 21
25 Terminals for external conductors . 22
26 Provision for earthing . 22
27 Screws and connections . 22
28 Creepage distances, clearances and distances through insulation . 22
Annexes . 23
Annex C (normative) Leakage current . 23
Annex I (informative) Measurement of noise and vibration emissions . 24
Annex K (normative) Battery tools and battery packs . 28
Bibliography . 29

Figure 101 – Wall saw . 8
Figure 102 – Wall saw with wheel guard removed . 9
Figure 103 – Safety sign illustrating – "WARNING – Always wear eye protection" . 10
Figure I.101 – Wall saw setup for noise measurement (wheel guard not shown) . 25

Table 4 – Required performance levels . 16
Table 101 – Material properties and minimum thickness of the wheel guard . 18
Table 8 – Minimum cross-sectional area and AWG sizes of supply cords . 21
Table I.101 – Expected uncertainty values . 27

– 4 – IEC 62841-3-7:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRIC MOTOR-OPERATED HAND-HELD TOOLS, TRANSPORTABLE
TOOLS AND LAWN AND GARDEN MACHINERY –
SAFETY –
Part 3-7: Particular requirements for transportable wall saws

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,
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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
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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
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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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
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) 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.
International Standard IEC 62841-3-7 has been prepared by IEC technical committee 116:
Safety of motor-operated electric tools.
The text of this International Standard is based on the following documents:
FDIS Report on voting
116/455/FDIS 116/461/RVD
Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
This Part 3-7 is to be used in conjunction with IEC 62841-1:2014.

This Part 3-7 supplements or modifies the corresponding clauses in IEC 62841-1, so as to
convert it into the IEC Standard: Particular requirements for transportable wall saws.
Where a particular subclause of Part 1 is not mentioned in this Part 3-7, 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 this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document 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.

– 6 – IEC 62841-3-7:2020 © IEC 2020
ELECTRIC MOTOR-OPERATED HAND-HELD TOOLS, TRANSPORTABLE
TOOLS AND LAWN AND GARDEN MACHINERY –
SAFETY –
Part 3-7: Particular requirements for transportable wall saws

1 Scope
This clause of Part 1 is applicable, except as follows:
Replacement of the third paragraph:
The rated voltage is not more than 250 V for single-phase a.c. or d.c. tools, and 480 V for
three-phase a.c. tools.
Addition:
This document applies to transportable wall saws guided by a track guiding system intended
for dry cutting or to be connected to a liquid system for cutting concrete, stone or similar
material by means of a diamond wheel. The rated speed of the diamond wheel does not
exceed a peripheral speed of 100 m/s at rated capacity.
This document does not apply to transportable wall saws that are intended to be left unattended
while performing an operation.
This document does not apply to transportable wall saws that employ hydraulic systems.
This document does not apply to hand-held cut-off machines.
NOTE 101 Hand-held cut-off machines will be covered by a future part of IEC 62841-2.
2 Normative references
This clause of Part 1 is applicable, except as follows:
Replacement of normative reference ISO 3744:
ISO 3744:2010, Acoustics – Determination of sound power levels and sound energy levels of
noise sources using sound pressure – Engineering methods for an essentially free field over a
reflecting plane
Replacement of normative reference ISO 11201:
ISO 11201:2010, Acoustics – Noise emitted by machinery and equipment – Determination of
emission sound pressure levels at a work station and at other specified positions in an
essentially free field over a reflecting plane with negligible environmental corrections

Addition:
IEC 61008-1:2010, Residual current operated circuit-breakers without integral overcurrent
protection for household and similar uses (RCCBs) – Part 1: General rules
IEC 61008-1:2010/AMD1:2012
IEC 61008-1:2010/AMD2:2013
IEC 62841-1:2014, Electric motor-operated hand-held tools, transportable tools and lawn and
garden machinery – Safety – Part 1: General requirements
ISO 6603-1, Plastics – Determination of puncture impact behaviour of rigid plastics – Part 1:
Non-instrumented impact testing
3 Terms and definitions
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
This clause of Part 1 is applicable, except as follows:
3.36 Addition:
NOTE 101 to entry: The primary function of a wall saw is the operation of the diamond wheel.
3.58 Modification:
Item g) is not applicable.
3.101
diamond wheel
metal wheel with a continuous or segmented abrasive rim
3.102
flange
collar, disc, or plate between or against which diamond wheels are mounted
3.103
rated capacity
maximum intended diameter of the diamond wheel to be fitted on the tool as recommended by
the manufacturer's instructions
3.104
remote connection
active communication between the tool and remote control, either wired or wireless
3.105
remote control
unit with an enclosure separate from the wall saw with user controls consisting of at least a
power switch for attended operation of the wall saw
Note 1 to entry: Controlling a wall saw with a remote control provides improved ergonomics for the operator.
3.106
saw unit
unit on which the diamond wheel, the wheel guard and the interface to connect it to the track
guiding system are mounted
– 8 – IEC 62841-3-7:2020 © IEC 2020
3.107
track guiding system
device for guiding the saw unit during the cutting operation and which is mounted to the
workpiece
3.108
wall saw
tool designed to saw or groove concrete, stone or similar material, consisting of a saw unit and
a track guiding system, which are combined for normal operation by a suitable interface and
operated with or without a remote control
Note 101 to entry: See Figure 101 and Figure 102.
3.109
wheel guard
device which partly encloses the diamond wheel and gives protection to the operator

Figure 101 – Wall saw
Figure 102 – Wall saw with wheel guard removed
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 does not include the track guiding system, but does include the wheel
guard and the auxiliary handle, if provided.
6 Radiation, toxicity and similar hazards
This clause of Part 1 is applicable.
7 Classification
This clause of Part 1 is applicable.

– 10 – IEC 62841-3-7:2020 © IEC 2020
8 Marking and instructions
This clause of Part 1 is applicable, except as follows:
8.1 Addition:
– recommended speed for each diamond wheel diameter specified in 8.14.2 a) 101);
– rated capacity.
8.2 Addition:
Wall saws shall also be marked with:
– " WARNING Always wear eye protection" or the symbol ISO 7010-M004-2019-07 or the
safety sign in Figure 103:
Figure 103 – Safety sign illustrating – "WARNING – Always wear eye protection"
The safety sign in Figure 103 may be modified by adding other personal protective equipment,
such as ear protection or a dust mask.
8.3 Replacement of the sixth dash:
– ">25 kg" on each separable enclosure with a mass above 25 kg.
NOTE 101 Examples of separable enclosures include the saw unit, diamond wheel, wheel guard and power
converting or control unit(s), if any.
Addition:
The direction of rotation of the spindle shall be indicated on the tool by an arrow, raised or
recessed or by any other means no less visible and indelible.
8.14.1 Addition:
The additional safety instructions as specified in 8.14.1.101 shall be given. This information
may be printed separately from the "General Power Tool Safety Warnings".
8.14.1.101 Safety instructions for wall saws
a) Operate the power tool by insulated grasping surfaces when performing an operation
where the cutting accessory can contact hidden wiring or its own cord. A cutting
accessory contacting a "live" wire can make exposed metal parts of the power tool "live"
and could give the operator an electric shock.
b) Wear ear protectors when diamond sawing. Exposure to noise can cause hearing loss.
c) If the diamond wheel becomes jammed, stop applying feed force and turn off the tool.
Investigate and take corrective actions to eliminate the cause of the diamond wheel
jamming. Continued operation with a jammed diamond wheel could cause loss of control
or damage to the wall saw.
d) When sawing through the workpiece, ensure to protect persons and the work area on
the other side. The diamond wheel may protrude through the workpiece.

e) Ensure that the method of securing the track guiding system to the workpiece is
capable of holding and restraining the machine during use. If the workpiece is weak or
porous, the anchor(s) can pull out, causing the track guiding system to release from the
workpiece.
8.14.2 a) Addition:
101) Information about which diamond wheels (type, arbor size, diameter and thickness)
can be used with the tool, including the recommended tool speed for each diamond
wheel diameter;
102) Information on the types of material that may be cut;
103) Instructions on how to mount the track guiding system to the workpiece;
104) Instructions on how to assemble the guarding system, dust extraction system or liquid
system, and the saw unit to the track guiding system;
8.14.2 b) Addition:
101) Instructions on how to use wheel guards, such as removing portions of the wheel guard
for special cutting operations (e.g. flush cutting);
102) Instructions on how to connect a remote control;
103) Information about the specific flanges to be used with all diamond wheels in
accordance with 8.14.2 a) 101). Instruction on the mounting of diamond wheels and
the use of the correct flanges;
104) Instructions on how to perform an initial guide cut.
8.14.2 c) Addition:
101) Instruction on storage and handling of diamond wheels.
Replacement of the NOTE:
NOTE In Europe (EN 62841-3-7), the following additional requirements apply:
Emissions
1) The noise emission, measured in accordance with I.2, as follows:
– A-weighted 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;
pA
– 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
– peak C-weighted instantaneous sound pressure value L , where this exceeds 63 Pa (130 dB in
pCpeak
relation to 20 µPa).
2) Recommendation for the operator to wear hearing protection.
3) The following information:
– that the declared noise emission value(s) have been measured in accordance with a standard test
method and may be used for comparing one tool with another;
– that the declared noise emission value(s) may also be used in a preliminary assessment of exposure.
4) A warning:
– that the noise emissions during actual use of the power tool can differ by up to 10 dB compared to the
declared values, depending on the diamond wheel and working conditions, which should be taken into
account when selecting hearing protection; 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).

– 12 – IEC 62841-3-7:2020 © IEC 2020
8.14.3 Replacement:
If information about the mass or weight of the tool is provided, it shall either be the mass
specified in 5.17, or it shall be clear which part of the tool the mass refers to.
Compliance is checked by inspection.
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.
13 Resistance to heat and fire
This clause of Part 1 is applicable.
14 Moisture resistance
This clause of Part 1 is applicable, except as follows:
14.2.1 Replacement:
The tool is not connected to the supply.
Tools are turned continuously at approximately 1 r/min through the most unfavourable positions
during the test.
The test is performed with any remote control connected in accordance with 8.14.2 b) 102).
Electrical components, covers and other parts, except for cover(s) or cap(s)as specified below,
that can be removed without the aid of a tool are removed and subjected, if necessary, to the
relevant treatment with the main part.
If cover(s) or cap(s) are used that
– are detachable without the aid of a tool; and
– provide protection for a connection to a remote control;
the test is repeated with the cover(s) or cap(s) installed as intended to cover the connection(s),
provided that the cap(s) or cover(s) remain attached to the wall saw when they are removed.

14.3 Replacement:
Liquid systems or spillage of liquid shall not subject the user to an increased risk of electrical
shock.
If the tool is rated at least IPX4 in accordance with 14.2, this requirement is deemed to be
fulfilled.
Compliance is checked by the following test:
The residual current device, if any, shall be disabled during the test. Electrical components,
covers and other parts which can be removed without the aid of a tool are removed, except
those fulfilling the test of 21.22.
The tool is prepared with approximately 1,0 % NaCl solution in the following modes if applicable:
– as described in 8.14.2;
– the liquid container of the tool is completely filled, and a further quantity, equal to 15 % of
the capacity of the container, or 0,25 l, whichever is the greater, is poured in steadily over
+0
a period of 60 s, while the tool is resting in its filling position in accordance with 8.14.2 d);
−10
– a detachable liquid container is filled completely and mounted and dismounted 10 times on
the tool.
In each applicable preparation, the tool is operated at rated voltage in each position consistent
with the instructions in accordance with 8.14.2 b) for 1 min while monitoring the leakage current
as in Clause C.3.
For 3-phase wall saws with a rated input exceeding 3 700 W, during the test the leakage
current shall not exceed:
– 5 mA for a, b and c in Figure C.2 in the closed position;
– 10 mA for the test repeated with each of the switches a, b, c in Figure C.2 open in turn, the
other two switches being closed.
For all other wall saws, during the test the leakage current shall not exceed:
– 2 mA for a class II tool;
– 5 mA for a class I tool.
Following this test, the tool shall meet the electric strength test of D.2 between live parts and
accessible parts after being allowed to dry for 24 h at ambient temperature.
14.4 Replacement:
Liquid systems shall not subject the user to an increased risk of electrical shock by
components not capable of withstanding the pressure during operation.
Compliance is checked by the following test.
The residual current device, if any, shall be disabled during the test.
The liquid system is closed and an approximately 1,0 % NaCl solution at a hydrostatic pressure
equal to twice the pressure stated in 8.14.2 d) 1) is applied for 1 h.
The tool is then placed for 1 min, in all positions consistent with the instructions in accordance
with 8.14.2 b) while monitoring the leakage current as in Clause C.2.

– 14 – IEC 62841-3-7:2020 © IEC 2020
For 3-phase wall saws with a rated input exceeding 3 700 W, during the test the leakage
current shall not exceed:
– 5 mA for a, b and c in Figure C.2 in the closed position;
– 10 mA for the test repeated with each of the switches a, b, c in Figure C.2 open in turn, the
other two switches being closed.
For all other wall saws, during the test the leakage current shall not exceed:
– 2 mA for a class II tool;
– 5 mA for a class I tool.
Following this test, the tool shall meet the electric strength test of Clause D.2 between live
parts and accessible parts after being allowed to dry for 24 h at ambient temperature.
14.5 Replacement:
Residual current devices used to provide protection from shock in the case of failure of the
liquid system shall comply with
– IEC 61540:1999; or
– alternatively for 3-phase tools, IEC 61008-1:2010
and shall meet the following requirements a) to c):
a) The RCD shall disconnect all mains conductors, but not the earth conductor if provided,
when the leakage exceeds
– 10 mA and with a maximum response of 300 ms; or
– alternatively for 3-phase tools, 30 mA with a maximum response time of 300 ms.
NOTE 1 For 3-phase tools, the values are based on specified levels in IEC 61008-1.
Compliance is checked by inspection and by the test of
– 9.9.2 of IEC 61540:1999 for single phase tools; or
– alternatively 9.9.2 in IEC 61008-1:2010 for 3-phase tools.
In addition, during the test, the earthing conductor shall not become disconnected.
b) The RCD shall be reliable for its intended use.
Compliance is checked at rated voltage by operating the residual current device under
conditions of simulated leakage as in a) above during conditions of locked rotor of the tool
for 50 cycles. The residual current device shall operate correctly for all cycles.
c) The RCD shall be installed such that it is unlikely to be removed during use or normal
maintenance.
This requirement is considered fulfilled if the residual current device is fixed to the tool or
the power supply cord connected to the tool.
Where fitted in the supply cord, the residual current device shall be provided with type
Y attachment or type Z attachment for connection with the supply cord and
interconnection cord.
Compliance is checked by inspection.
NOTE 2 In Canada, the following conditions apply:
Replacement of the first paragraph:

Residual current devices used to provide protection from shock in the case of failure of the liquid system shall
comply with
– IEC 61540:1999; or
– alternatively for 3-phase tools, IEC 61008-1:2010 up to 440 V; or
– alternatively for 3-phase tools, CSA C22.2 No. 144 above 440 V;
and shall meet the following requirements a) to c).
NOTE 3 In the United States of America, the following conditions apply:
Replacement of the first paragraph:
Residual current devices used to provide protection from shock in the case of failure of the liquid system shall
comply with
– IEC 61540:1999; or
– alternatively for 3-phase tools, IEC 61008-1:2010 up to 440 V; or
– alternatively for 3-phase tools, UL 1053 above 440 V;
and shall meet the following requirements a) to c).
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 of the fourth paragraph:
Wall saws are operated for 12 h at a voltage equal to 1,1 times rated voltage or the upper limit
of the rated voltage range, and then for 12 h at a voltage equal to 0,9 times rated voltage or
the lower limit of the rated voltage range. It is not required that the 12 h of operation be
continuous. During the test, the tool is placed in three different positions, the operating time, at
each test 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 cutting horizontally, vertically up and vertically down on a vertical wall.
18 Abnormal operation
This clause of Part 1 is applicable, except as follows:
18.8 Replacement of Table 4 by the following:

– 16 – IEC 62841-3-7:2020 © IEC 2020
Table 4 – Required performance levels
Type and purpose of SCF Minimum performance level
(PL)
Power switch – prevent unwanted switch-on (including power switches Shall be evaluated using the
located on a remote control) fault conditions of 18.6.1
without the loss of this SCF
Power switch – provide desired switch-off (including power switches located c
on a remote control)
Provide desired direction of rotation when the diamond wheel is prevented Not an SCF
from loosening under reverse rotation
Provide desired direction of rotation when the diamond wheel is not prevented c
from loosening under reverse rotation
Any electronic control to pass the test of 18.3 a
Prevent exceeding thermal limits as in Clause 18 a
Any electronic control to pass the test of 19.103 Not an SCF
Any electronic control to limit the force as in 19.104 b
Restart prevention according to 21.18.2.1 c
Prevent starting of any motor drive without a remote connection to a remote c
control and stop operation of any motor drive after loss of a remote
connection to a remote control during operation,as in 21.102
Prevent self-resetting as required in 23.3, except for circuits that switch off the a
tool owing to a loss of a remote connection on a remote control
Prevent self-resetting after re-establishing a remote connection on a remote c
control, as required in 23.3
19 Mechanical hazards
This clause of Part 1 is applicable, except as follows:
19.1 Replacement of the first paragraph:
Moving and dangerous parts other than the rotating diamond wheel shall be so arranged or
enclosed that adequate protection against injury is provided. The guarding of the rotating
diamond wheel is covered in 19.101.
19.6 This subclause of Part 1 is not applicable.
19.8 This subclause is applicable for wall saws, if provided with:
– wheels; or
– a cart with wheels.
19.101 Diamond wheel guards
Tools shall be provided with a wheel guard to protect the user during normal use against:
– accidental contact with the cutting section of the diamond wheel;
– ejection of debris of the material cut;
– broken segments of the diamond wheel;
– liquid used for the cutting operation (if applicable).
The wheel guard may be removable without the aid of a tool to facilitate changing the diamond
wheel or transportation, provided that the locking means for the wheel guard remains attached

on the wheel guard or the saw unit.

NOTE 101 In normal use, the wheel guards of a wall saw are always disassembled for transport, during change
of working position and for changing the diamond wheel. The wheel guard is then reassembled for operation each
time. In addition, it is typical that the wheel guard needs to be disassembled and reassembled several times in order
to perform a deep cut.
The wheel guard, except as specified below for special cutting operations, shall cover at least
175° of
– the periphery and the motor side;
– the side where the nut and locking flange are located for at least the outer 30 mm of the
radius of the smallest diamond wheel which may be used with the wheel guard in
accordance with 8.14.2a) 101) to cover the cutting section of the diamond wheel.
In order to perform special cutting operations (e.g. flush cutting) in accordance with 8.14.2 b)
101),
– a section of the wheel guard may be removable or adjustable without the aid of a tool,
provided the remaining wheel guard coverage is not less than 90°, or a separate wheel
guard complying with this requirement may be supplied with the tool;
– a side of the wheel guard may be removable without the aid of a tool to allow a flush cut
close to an adjacent surface, provided the wheel guard coverage on the motor side is not
impaired, or a separate wheel guard complying with this requirement may be supplied with
the tool.
Compliance is checked by inspection and by measurement.
19.102 The tool shall be designed to prevent the diamond wheel coming loose under normal
use.
The spindle and flanges shall be designed so that they secure and locate the diamond wheel
to the wall saw. At least one of the flanges shall be keyed, screwed, shrunk on or otherwise
secured to prevent rotation relative to the tool spindle.
Either the direction of the spindle threads shall be such that any clamping device or diamond
wheel with a threaded hole tends to tighten during cutting, or the flange shall have positive
locking to the spindle.
Flanges shall have flat clamping surfaces and no sharp edges.
Compliance is checked by inspection.
19.103 Flanges shall be designed in such a manner as to achieve an equivalent level of
clamping strength to ensure that the diamond wheel will not slip during operation.
Compliance is checked by inspection and, if applicable, by the following test.
If applicable, the tool is adjusted to its setting that results in the maximum stalling torque. The
tool is fitted with any diameter diamond wheel in accordance with 8.14.2 a) 101), which is
compatible with the setting that results in the maximum stalling torque. The diamond wheel
and flanges are mounted in accordance with 8.14.2 b) 103). The tool is then operated at no
load. The tool shall come to full speed and then stopped by a stalling device that stops the
diamond wheel rotation within 1 s. During the test, the diamond wheel shall not slip in the
flange by more than 10°.
NOTE 101 An example of a method for monitoring diamond wheel slippage is the use of a high-speed camera.
19.104 The track guiding system shall be provided with end stops to prevent travel of the
saw unit beyond the intended travel when subjected to the maximum feeding force.
Compliance is checked by the following test.

– 18 – IEC 62841-3-7:2020 © IEC 2020
For manually fed saw units, the handle of the crank or feed mechanism is subjected to a force
of (200 ± 10) N for 1 min.
For motor-fed saw units, the end stops are subjected to twice the maximum force for 1 min that
would be generated from the motor. The force is applied to the end stops as in normal use.
During this test, limit switches or other means of limiting the travel of the saw unit are bypassed.
However, electronic circuits that limit the applied force are acceptable if they are assessed
as providing an SCF.
The saw unit shall not move beyond the end stops.
20 Mechanical strength
This clause of Part 1 is applicable, except as follows:
20.5 Replacement:
Wall saw handles and grasping surfaces, as specified in the instruction manual in accordance
with 8.14.2 b) 6), but excluding handles used only for transportation purposes in accordance
with 8.14.2 b) 8), shall have adequate mechanical strength in order to provide insulation
between the grasping area and the output shaft.
Compliance is checked by the following test.
A separate sample, at the discretion of the manufacturer, is to be subjected to a single impact
on each handle and grasping surface in accordance with 20.3.2, followed by an electric strength
test in accordance with Clause D.2 using 1 250 V a.c. between the handles and grasping
surfaces in contact with foil and the output shaft of the tool.
20.101 The wheel guard, as required by 19.101, shall have sufficient mechanical strength to
withstand the impact of broken diamond segments.
Except for plastic material other than polycarbonate, the material properties and the minimum
thickness of the peripheral part and side part of the wheel guard shall be as specified in
Table 101.
Table 101 – Material properties and minimum thickness of the wheel guard
Material of wheel Ultimate tensile Minimum Minimum thickness
guard strength fracture
elongation mm
N/mm
Peripheral part Side part (relevant
outer 30 mm per
19.101)
Metal ≥ 380 - 1,25 0,75
Metal ≥ 350 and < 380 - 1,50 1,00
Metal - 2,00 1,50
≥ 200 and < 350
Metal ≥ 160 and < 200 - 2,50 1,75
Polycarbonate 60 80 % 3,00 2,00

For materials as specified in Table 101, compliance is checked by inspection, by measurement
and by either receipt of confirmation of material properties from the material manufacturer or
through measureme
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