IEC 60335-2-92:2002

INTERNATIONAL IEC
STANDARD
60335-2-92
Second edition
2002-07
Household and similar electrical appliances –
Safety –
Part 2-92:
Particular requirements for pedestrian-controlled
mains-operated lawn scarifiers and aerators
Appareils électrodomestiques et analogues –
Sécurité –
Partie 2-92:
Règles particulières pour les scarificateurs de gazon
et les aérateurs fonctionnant sur le réseau et pour
conducteur à pied
Reference number
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INTERNATIONAL IEC
STANDARD
60335-2-92
Second edition
2002-07
Household and similar electrical appliances –
Safety –
Part 2-92:
Particular requirements for pedestrian-controlled
mains-operated lawn scarifiers and aerators
Appareils électrodomestiques et analogues –
Sécurité –
Partie 2-92:
Règles particulières pour les scarificateurs de gazon
et les aérateurs fonctionnant sur le réseau et pour
conducteur à pied
© IEC 2002 ⎯ Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch  Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
X
International Electrotechnical Commission
Ɇɟɠɞɭɧɚɪɨɞɧɚɹ ɗɥɟɤɬɪɨɬɟɯɧɢɱɟɫɤɚɹ Ʉɨɦɢɫɫɢɹ
For price, see current catalogue

– 2 – 60335-2-92 © IEC:2002(E)
CONTENTS
FOREWORD . 4
INTRODUCTION .6
1 Scope . 7
2 Normative references. 7
3 Definitions . 8
4 General requirement .10
5 General conditions for the tests .10
6 Classification .10
7 Marking and instructions .11
8 Protection against access to live parts .13
9 Starting a motor-operated appliance .13
10 Power input and current.14
11 Heating.14
12 Void .14
13 Leakage current and electric strength at operating temperature .14
14 Transient overvoltages.14
15 Moisture resistance.14
16 Leakage current and electric strength .14
17 Overload protection of transformers and associated circuits.14
18 Endurance .15
19 Abnormal operation.15
20 Stability and mechanical hazards.15
21 Mechanical strength.21
22 Construction .21
23 Internal wiring.23
24 Components .23
25 Supply connection and external flexible cords.23
26 Terminals for external conductors .24
27 Provision for earthing.25
28 Screws and connections .25
29 Clearances, creepage distances and solid insulation .25
30 Resistance to heat and fire .25
31 Resistance to rusting .25
32 Radiation, toxicity and similar hazards .25
Annexes.34
Annex AA (normative) Test enclosure construction.34
Annex BB (normative) Base for thrown object test enclosure.39
Annex CC (normative) Target panel elevation zones and recommended test report for
thrown object test.42

60335-2-92 © IEC:2002(E) – 3 –
Bibliography.44
Figure 101 – Safety distances – Rotary appliances .26
Figure 102 – Safety distances – Other lawn scarifiers and aerators.27
Figure 103 – Foot probe.28
Figure 104 – Foot probe test .29
Figure 105 – Strength of cutting means.30
Figure 106 – Operator zone .31
Figure 107 – Use of test rod to check guarding of cylinders.32
Figure 108 – Side coverage of cylinders.32
Figure 109 –Guarding of rear discharge cylinders .32
Figure 110 – Guarding of front discharge cylinders .32
Figure 111 – Impact test fixture for handle insulation .33
Figure AA.1 – Thrown object test fixture.35
Figure AA.2 – Single spindle rotary appliances – Test enclosure.36
Figure AA.3 – Test enclosure walls and base .37
Figure AA.4 – Test fixture for corrugated fibreboard penetration test.38
Figure BB.1 – Thrown object test fixture base detail.40
Figure BB.2 – Nail plan of test fixture base .41
Table CC.1 – Recommended test data sheet.43

– 4 – 60335-2-92 © IEC:2002(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-92: Particular requirements for pedestrian-controlled
mains-operated lawn scarifiers and aerators
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
This part of International Standard IEC 60335 has been prepared by IEC subcommittee 61F:
Safety of hand-held motor-operated electric tools, of IEC technical committee 61: Safety of
household and similar electrical appliances.
This second edition cancels and replaces the first edition published in 2000. It constitutes a
technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
61F/453/FDIS 61F/474/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This part 2 is to be used in conjunction with the latest edition of IEC 60335-1 and its
amendments. It was established on the basis of the fourth edition (2001) of that standard.
NOTE 1 When “Part 1” is mentioned in this standard, it refers to IEC 60335-1.
This part 2 supplements or modifies the corresponding clauses in IEC 60335-1, so as to
convert that publication into the IEC standard: Safety requirements for pedestrian-controlled
mains-operated electric lawn scarifiers and aerators.

60335-2-92 © IEC:2002(E) – 5 –
When a particular subclause of Part 1 is not mentioned in this part 2, that subclause applies
as far as is reasonable. When this standard states “addition”, “modification” or “replacement”,
the relevant text in Part 1 is to be adapted accordingly.
NOTE 2 The following numbering system is used:
– subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1;
– unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including
those in a replaced clause or subclause;
– additional annexes are lettered AA, BB, etc.
NOTE 3 The following print types are used:
– requirements proper: in roman type;
– test specifications: in italic type;
– notes: in small roman type;
Words in bold in the text are defined in Clause 3. When a definition concerns an adjective, the adjective and the
associated noun are also in bold.
The committee has decided that the contents of this publication will remain unchanged until
2004. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
The contents of the corrigendum of May 2003 have been included in this copy.

– 6 – 60335-2-92 © IEC:2002(E)
INTRODUCTION
It has been assumed in the drafting of this international standard that the execution of its
provisions is entrusted to appropriately qualified and experienced persons.
This standard recognizes the internationally accepted level of protection against hazards such
as electrical, mechanical, thermal, fire and radiation of appliances when operated as in
normal use taking into account the manufacturer's instructions. It also covers abnormal
situations that can be expected in practice.
This standard takes into account the requirements of IEC 60364 as far as possible so that
there is compatibility with the wiring rules when the appliance is connected to the supply
mains. However, national wiring rules may differ.
If an appliance within the scope of this standard also incorporates functions that are covered
by another part 2 of IEC 60335, the relevant part 2 is applied to each function separately, as
far as is reasonable. If applicable, the influence of one function on the other is taken into
account.
This standard is a product family standard dealing with the safety of appliances and takes
precedence over horizontal and generic standards covering the same subject.
An appliance that complies with the text of this standard will not necessarily be considered to
comply with the safety principles of the standard if, when examined and tested, it is found to
have other features that impair the level of safety covered by these requirements.
An appliance employing materials or having forms of construction differing from those detailed
in the requirements of this standard may be examined and tested according to the intent of
the requirements and, if found to be substantially equivalent, may be considered to comply
with the standard.
60335-2-92 © IEC:2002(E) – 7 –
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-92: Particular requirements for pedestrian-controlled
mains-operated lawn scarifiers and aerators
1 Scope
This clause of Part 1 is replaced by the following.
This International Standard deals with the safety of pedestrian-controlled mains-operated
electrical lawn scarifiers and aerators with rotating cutters for regenerating lawns by, for
instance, combing out grass thatch and moss, or by cutting vertically into the lawn face.
These scarifiers are designed primarily for use at and around the home or for similar
purposes, their rated voltage being not more than 250 V single phase.
This standard does not, in general, take into account:
– the use of appliances by young children or infirm persons without supervision;
– playing with the appliance by young children.
NOTE 101 Attention is drawn to the fact that
– in many countries additional requirements are specified by the national authorities responsible for the protection
of labour.
NOTE 102 This standard does not apply to
– lawnmowers (IEC 60335-2-77);
– lawn trimmers and lawn edge trimmers (IEC 60335-2-91);
– lawn edgers, flail mowers, sickle-bar mowers or agricultural mowers.
2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
ISO 2758:2001, Paper – Determination of bursting strength
ISO 3411:1995, Earth-moving machinery – Human physical dimensions of operators and
minimum operator space envelope
ISO 3767-1:1998, Tractors, machinery for agriculture and forestry, powered lawn and garden
equipment – Symbols for operator controls and other displays – Part 1: Common symbols
ISO 3767-3:1995, Tractors, machinery for agriculture and forestry, powered lawn and garden
equipment – Symbols for operator controls and other displays – Part 3: Symbols for powered
lawn and garden equipment
ISO 3864, Safety colours and safety signs
ISO 13852:1996, Safety of machinery – Safety distances to prevent danger zones being
reached by the upper limbs
– 8 – 60335-2-92 © IEC:2002(E)
3 Definitions
This clause of Part 1 is applicable except as follows.
3.1.9 Replacement:
normal operation
operation of the appliance under the following conditions: the appliance is operated at rated
voltage with the load necessary to attain rated power input
3.101
braking system
a combination of one or more brakes and related means of operation and control
3.102
catcher
a part or combination of parts which provides a means for collecting grass, thatch, moss or
other debris
3.103
control
means or device which will control the operation of the appliance or any specific operating
function thereof
3.104
cutting means
for the purposes of this standard, the mechanism used to provide the cutting action of a
scarifier or aerator
3.105
cutting means enclosure (housing)
the part of the assembly which provides the protective means around the cutting means
3.106
cutting means tip circle
the path described by the outermost point of the cutting means as it rotates about its shaft
axis.
3.107
cutting position
any setting of the cutting means designated by the manufacturer
3.108
cutting width
the width of cut measured across the cutting means at right angles to the direction of travel
and calculated from the dimensions of the cutting means or the diameter(s) of the cutting
means tip circle(s)
3.109
discharge chute
an extension of the cutting means enclosure from the discharge opening, generally used to
control the discharge of material from the cutting means
3.110
discharge opening
a gap or opening in the cutting means enclosure through which grass, thatch and moss may
be discharged
60335-2-92 © IEC:2002(E) – 9 –
3.111
guard
a part of the appliance or component incorporated to provide protection for the operator
and/or bystander
3.112
handle
any part likely to be hand-held for guiding the appliance in normal use
3.113
hit
the test projectile passing completely through all layers of the target material
3.114
intended use
any use of the appliance which is reasonably foreseeable, as described in the user
instructions, and which is consistent with such activities as operating, starting, stopping or
connecting to (or disconnecting from) a power source
3.115
lawn aerator
a powered appliance designed for slitting the lawn surface. The appliance uses the ground to
determine the height of cut
3.116
lawn scarifier
lawn rake
an appliance where the cutting means cuts vertically into the lawn or earthface, or scratches
the surface, thereby also combing the lawn. The appliance uses the ground to determine the
height of cut
3.117
maximum operating motor speed
the highest motor speed obtainable when the motor is adjusted in accordance with the
manufacturer's specifications and/or instructions, with the cutting means engaged
3.118
operator control
any control requiring the operator’s actuation to perform specific functions
3.119
operator presence control
a control designed so that it will automatically interrupt power to a drive when the operator's
actuating force is removed
3.120
operator zone
the operator zone for persons operating a lawn scarifier or lawn aerator
3.121
parking brake
a device incorporated into the appliance which, when operated, prevents the appliance from
moving from a stationary position and remains applied without the operator present
3.122
pedestrian-controlled
ground-supported, controlled by an operator walking behind

– 10 – 60335-2-92 © IEC:2002(E)
3.123
power source
a motor which provides mechanical energy for linear or rotational movement
3.124
rotary appliance
a scarifier/ aerator in which the cutting means rotates about an axis or axes normal to the
ground
3.125
service brake
the designated primary means for decelerating and stopping a machine from its ground travel
speed
3.126
thrown object hazard
the potential for injury caused by object(s) propelled by the moving cutting means
3.127
tine(s)
for the purposes of this standard, a term used in warnings and instructions to denote "cutting
means" (see 3.104)
3.128
traction drive
the means (system) used to transmit power from the power source to the ground drive means
4 General requirement
This clause of Part 1 is applicable.
5 General conditions for the tests
This clause of Part 1 is applicable except as follows.
5.5 Addition:
During the tests the cutting means are adjusted and lubricated in accordance with the
manufacturer's instructions specific to the test.
5.6 Addition:
Electronic speed control devices are set for the highest speed.
6 Classification
This clause of Part 1 is applicable except as follows.
6.1 Replacement:
Appliances shall be either class II or class III with respect to protection against electric
shock.
Compliance is checked by inspection and by the relevant tests.

60335-2-92 © IEC:2002(E) – 11 –
6.2 Addition:
Appliances shall be at least IPX4.
7 Marking and instructions
This clause of Part 1 is applicable except as follows.
7.1 Addition:
Appliances shall be marked with their rated power input.
The substance of the following warning shall be placed in a prominent position on the
appliance. The letters, which may be in upper or lower case, shall be a minimum of 3 mm
high, in black on a yellow background. Where appropriate IEC/ISO symbols or pictograms are
available, they may be used. Markings or symbols giving cautionary information shall be
located close to the hazard.
WARNING: Switch off and remove plug from mains before adjusting, cleaning or if the
cord is entangled or damaged.
Read the instructions sheet.
Keep the supply flexible cord away from the cutting blades.
Blades continue to rotate after machine is switched off.
For rotary lawn scarifiers/lawn aerators, if applicable, an instruction that the appliance shall
not be operated without either the entire catcher or guard in place shall be fixed near the
discharge opening and the catcher adaptor, if one is used.
7.6 Addition:
NOTE 101 Information on operator symbols may be found in ISO 3767-1 and ISO 3767-3, and in ISO 3864 for
colours.
7.9 Modification:
Replace the first paragraph by the following:
Operator controls as described in 20.101.1, other than those whose purpose is obvious,
shall have the function, direction and/or method of operation clearly identified by a durable
label or mark.
7.12 Replacement:
An instruction sheet shall be supplied with the appliance.
The instructions shall include
a) those warnings required to be marked on the appliance together with further explanation,
where appropriate;
b) instructions for the proper assembly of the appliance for use, if the appliance is not
supplied in a completely assembled form;
c) for rear delivery appliances with exposed rear rollers when used without a catcher, full
eye protection shall be worn;
– 12 – 60335-2-92 © IEC:2002(E)
d) instructions for proper adjustment of the appliance, including a warning of the danger of
rotating parts, for example,
CAUTION – Do not touch rotating parts;
e) instructions for the safe operation of the appliance, including a recommendation that the
appliance should be supplied via a residual current device (RCD) with a rated tripping
current of not more than 30 mA;
f) instructions on the operation of all controls;
g) advice on the use and type of extension cords to be used (not lighter than required in
25.7);
h) Instructions for fitting and use of attachments, if any;
i) the following information:
1) the continuous A-weighted equivalent sound pressure level at the operator's ear if over
70 dB(A), or a statement to the effect that it does not exceed 70 dB(A);
2) the peak C-weighted instantaneous sound pressure level if over 63 Pa (130 dB in
relation to 20 μPa);
3) the sound power level emitted by the tool where the equivalent continuous sound
pressure level exceeds 85 dB(A);
4) the weighted root mean square acceleration value if it exceeds 2,5 m/s ;
5) a statement to the effect if the weighted r.m.s acceleration value does not exceed
2,5 m/s ;
j) the substance of the following, where appropriate:
1) Training
– Read the instructions carefully. Be familiar with the controls and the proper use of
the appliance.
– Never allow children to use the appliance.
– Never allow people unfamiliar with these instructions to use the appliance. Local
regulations may restrict the age of the operator.
– Never operate the appliance while people, especially children, or pets are nearby.
– The operator or user is responsible for accidents or hazards occurring to other
people or their property.
2) Preparation
– While operating the appliance, always wear substantial footwear and long trousers.
– Do not operate the appliance when barefoot or wearing open sandals.
– Thoroughly inspect the area where the appliance is to be used and remove all
stones, sticks, wires, bones, and other foreign objects.
– Before using, always visually inspect to see that the rotating parts and cutter
assembly are not worn or damaged. Replace worn or damaged parts in sets to
preserve balance.
3) Operation
– Operate the appliance only in daylight or in good artificial light.
– Avoid operating the appliance in wet grass, where feasible.
– Always be sure of your footing on slopes.
– Walk, never run.
– Always work across the face of slopes, never up and down.
– Exercise extreme caution when changing direction on slopes.
– Do not operate the appliance on excessively steep slopes.

60335-2-92 © IEC:2002(E) – 13 –
– Use extreme caution when reversing or pulling the appliance towards you.
–Stop the rotating parts if the appliance has to be tilted for transportation. Do not
operate the cutting means when crossing surfaces other than grass, and when
transporting the appliance to and from the working area.
– Never operate the appliance with defective guards or shields, or without safety
devices, for example deflectors and/or catchers in place.
– Switch on the motor according to instructions and with feet well away from rotating
parts.
– Do not tilt appliance when switching on the motor, except if the appliance has to be
tilted for starting. In this case, do not tilt it more than absolutely necessary and lift
only the part which is away from the operator. Always ensure that both hands are in
the operating position before returning the appliance to the ground.
– Do not put hands or feet near or under rotating parts.
–For rotary appliances keep clear of the discharge opening at all times.
– Never pick up or carry an appliance while the motor is running.
– Pull the plug from the socket:
• whenever you leave the machine;
• before clearing a blockage;
• before checking, cleaning or working on the appliance;
• after striking a foreign object. Inspect the appliance for damage and make
repairs as necessary;
• if the appliance starts to vibrate abnormally, check immediately.
4) Maintenance and storage
– Keep all nuts, bolts and screws tight to be sure the appliance is in safe working
condition.
–Check the catcher frequently for wear or deterioration.
– Replace worn or damaged parts for safety.
8 Protection against access to live parts
This clause of Part 1 is applicable except as follows.
8.2 Addition:
For class II rotary appliances access to the surface of basic insulation or metal parts
separated from live parts by basic insulation shall be permitted when the cutting means is
removed if a tool is required for its removal.
9 Starting a motor-operated appliance
This clause of Part 1 is replaced by the following.
Motors shall start under all normal voltage conditions which may occur in use.
Centrifugal and other automatic starting switches shall operate reliably and without contact
chattering.
Compliance is checked by starting the appliance three times, at no-load, at a voltage equal to
0,85 times rated voltage or the lower limit of the rated voltage range, with any control
device set at maximum speed.
– 14 – 60335-2-92 © IEC:2002(E)
For the test the cutting means are adjusted according to the manufacturer’s instructions
related to this test.
The appliance shall operate in such a way that safety is not affected.
10 Power input and current
This clause of Part 1 is applicable.
10.1 Not applicable.
11 Heating
This clause of Part 1 is applicable.
12 Void
13 Leakage current and electric strength at operating temperature
This clause of Part 1 is applicable.
14 Transient overvoltages
This clause of Part 1 is applicable.
15 Moisture resistance
This clause of Part 1 is applicable except as follows.
15.1.2 Addition:
Appliances fitted with an appliance inlet or cable coupler shall be tested with the appropriate
mating connector in place.
Air filters are not removed.
16 Leakage current and electric strength
This clause of Part 1 is applicable except as follows.
16.3 Addition:
Insulation equivalent to supplementary insulation provided to comply with 22.35 shall be
tested in accordance with the requirements for supplementary insulation.
17 Overload protection of transformers and associated circuits
This clause of Part 1 is applicable.

60335-2-92 © IEC:2002(E) – 15 –
18 Endurance
This clause of Part 1 is applicable except as follows.
18.101 Appliances shall be so constructed that, in normal use, there will be no electrical or
mechanical failure that might impair compliance with this standard. The insulation shall not be
damaged, and contacts and connections shall not have worked loose as a result of heating,
vibration, etc.
Moreover, overload devices shall not operate under normal running conditions.
Compliance is checked by the tests of 18.102.
18.102 The appliance is operated at no load, series motors being supplied at a voltage such
that the rotating speed is the same as that obtained at rated voltage and under normal
operation. The appliance is operated for 48 h, reduced by the running time necessary for the
tests of Clauses 11 and 13.
Appliances are operated continuously, or for a corresponding number of periods, each period
being not less than 8 h.
During the test, replacement of carbon brushes is allowed and the appliance is lubricated as
in normal use.
18.103 During the tests of 18.102, overload protective devices shall not operate.
After the tests of 18.102, the appliance shall withstand the tests of Clause 16. Connections,
handles, guards, brush-caps and other fittings or components shall not have worked loose,
and there shall be no deterioration impairing safety in intended use.
19 Abnormal operation
This clause of Part 1 is applicable except as follows.
19.7 Addition:
This test is not made on appliances with flexible or freely pivoting cutting means mounted on
a generally circular drive unit.
19.9 Not applicable.
20 Stability and mechanical hazards
This clause of Part 1 is applicable except as follows.
20.2 Replacement:
To prevent unexpected operation which may result in a hazard, only manually reset cut-outs
and those which require the operating control to be released are allowed.
All power-driven components except the cutting means and the ground-contacting parts of
power-propelled appliances shall be guarded to prevent contact with these parts during
normal operation.
All apertures and safety distances shall conform to the relevant clauses of ISO 13852.

– 16 – 60335-2-92 © IEC:2002(E)
Rotating covers or discs shall have a continuous unbroken or smooth surface.
Where a guard is designed to be opened or removed, thereby exposing a hazard, a safety
sign warning of the hazard shall be located on the guard or adjacent to the guard.
All guards shall be permanently attached to the appliance and shall not be detachable
without the use of tools. The opening of guards shall require the use of a tool. Exceptions to
this are the opening or removing of interlocked guards which disable the protected moving
parts, or the opening of automatically closing hinged guards for discharge chutes.
Compliance is checked by inspection and measurement.
20.101 Controls
20.101.1 General
The operator controls shall accommodate the 5th to 95th percentile adult operator as
specified in ISO 3411.
The following are not operator controls:
– height/depth of cut setting;
– catcher discharge arrangements;
– cable restraint/guides.
The location and range of movement of operator controls shall be convenient to the operator
and shall remain within the anthropometric dimensions given in Figure 106. The operating
range of less frequently used operator controls may be extended by allowing the operator's
trunk, when the operator is standing with both feet on the ground, to articulate within the
confines of the operator zone (e.g. lean forward until contacting the handle in any of the
operating positions).
20.101.2 Operator presence control
Appliances shall be fitted with a device on the control handle which will automatically stop
the rotation of the cutting means when the operators hands are removed from the handle.
This may be accomplished either by stopping the drive motor or by an intermediate cutting
means clutch/brake mechanism. For starting the rotation of the cutting means the control
must require two separate and dissimilar actions. If these actions are to be carried out by
using the same hand, then the actions must be totally distinct in order to prevent accidental
"switch on".
20.101.3 Traction drive
For appliances with traction drive
– the control for traction drive shall automatically stop or disengage the traction drive
when the operator leaves the normal operating position;
– the reverse function of the traction drive control shall require continuous activation in
the direction of travel to drive;
– it shall be possible to engage or disengage the traction drive when the cutting means is
operating.
20.102 Braking requirements
20.102.1 General
Appliances shall not require an excessive force to hold the appliance stationary on a slope.

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Appliances requiring additional means, i.e., service brake or parking brake system, shall
meet the requirements of 20.102.2 and 20.102.3.
The appliance shall be equipped with the tyres supplied by the manufacturer having the least
tread area in contact with the test surface.
If steering assisted brakes are also used for service brakes it shall be possible to connect
them in such a way that they apply both brakes with equal force.
For appliances without braking means, compliance is checked as follows.
Tests are carried out with the appliance facing directly up and directly down a 30 % (16,7°)
slope. A force of not more than 220 N, applied at or below the centre of gravity and directly up
and down the slope, shall be required to hold the appliance stationary.
20.102.2 Service brake
Test stops are conducted on a substantially level (not to exceed 1 % gradient) dry, smooth,
hard surface roadway of concrete (or equivalent test surface). When testing an appliance with
separate clutch and brake control means, the clutch shall be simultaneously disengaged with
brake engagement. Tests are carried out with the appliance in both forward and reverse
directions at the maximum ground speed attainable.
Using the braking system provided, the appliance shall stop within a distance of 0,19 m for
each 1 km/h.
20.102.3 Parking brake
A parking brake shall be provided on appliances requiring a service brake.
The parking brake may be in combination with the service brake.
An automatic parking brake, when provided, shall be activated when the operator presence
control is released.
Tests are conducted on a 30 % slope with a coefficient of friction such that the appliance does
not slide down the slope. The appliance is positioned on the slope with its parking brake
engaged and locked, transmission in neutral and the motor switched off. The appliance is
tested both with its front downhill and its rear downhill.
The appliance shall not move down the slope, and the force required to engage and unlock
the parking brake shall not exceed 220 N.
20.102.4 Handle construction
The scarifier handles shall be fastened to the machine so as to prevent loss of control by
unintentional uncoupling while in operation.
A positive means (latch or upper stop) shall be provided which cannot be unintentionally
disengaged during normal operation of the scarifier, and shall not allow the end of the
handle adjacent to the operator to come nearer than 450 mm horizontally behind the nearest
path of the cutting means during normal operation (see Figure 101) on scarifiers with more
than one axle. On single-axle scarifiers this distance shall be 600 mm when the grip of the
handle is at a height of 900 mm above the ground (see Figure 102).
For easier storage, handles may be unlatched or folded up.

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The width of the handle grip shall be at least three quarters of the cutting width of the scarifier
or 500 mm, whichever is the greater. When this width of the handle grip is not achieved, the
horizontal distance between the nearest path of the cutting means and the handle grip shall be
900 mm (see Figure 102).
The handle shall have a gripping length of at least 100 mm.
Compliance is checked by inspection and measurement.
20.103 Requirements for rotary appliances
20.103.1 Cutting means enclosure
20.103.1.1 General
Scarifiers with rear discharge openings shall have a movable deflector, the closing torque of
which shall not be less than 0,30 Nm for machines with a cutting width of 300 mm or less, and
not less than 0,40 Nm for machines with a cutting width of 300 mm to 600 mm.
20.103.1.2 Discharge openings (chutes)
When open discharge chutes are provided, no tangential line from the cutting means tip
circle in or above the plane of the cutting means tip circle and in the direction of rotation of
the cutting means shall intersect the operator target area without first contacting the cutting
means enclosure or guard.
20.103.1.3 Access to cutting means
Inadvertent access to the cutting means by the feet during operation shall be prevented so
far as is reasonably practicable.
On the operator side, the distance between the blade tip circle and the rear housing or a
deflector shall be at least 120 mm (see Figure 101).
Scarifiers with discharge openings shall have deflectors (e.g. catchers, baffle plates) which
catch thrown objects and prevent inadvertent access by the operator’s feet.
Movable deflectors shall return to the closed position automatically.
Instructions shall be affixed to the scarifier near the discharge opening and to the catcher
adapter, if one is used, stating that the scarifier shall not be operated without either the entire
catcher or the guard in place.
Compliance is checked by inspection.
For the guards at the sides of the machine, compliance is checked by the following test using
the foot probe (Figure 103) as illustrated in Figure 104.
The scarifier is placed on a hard flat surface, the guards or deflectors or both being in the
normal operating position on the cutting means housing and the support members (wheels)
in contact with the supporting surface. The test is conducted under static conditions.
Single axle scarifiers are to be positioned as instructed by the manufacturer or so that the
handle grip is 900 mm above the supporting surface.
The tests are made with the cutting means in the highest and lowest cutting position. The
base of the test probe is held horizontally at any height and then inclined up to 15° forward or
backward from the horizontal. The probe is applied at any point of the housing side.

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The test probe shall not enter the path of the cutting means assembly. The test probe shall
not lift the scarifier or any of its parts from the supporting surface.
20.103.2 Thrown object hazard
Appliances shall be so constructed as to provide, in intended use, adequate protection
against risk of injury to persons from foreign objects that may be thrown out by the rotating
cutting means.
Compliance is checked by the following test.
The appliance is placed in the test enclosure described in Annex AA with the base of the
enclosure being as described in Annex BB. The target panel construction used shall be
checked by the tests contained in AA.2 immediately before and after this test. The target
panels shall be divided into elevation zones by horizontal lines as indicated in Figure AA.1
and described in Annex CC.
The projectiles used in the test are 6,35 mm diameter balls of hardened steel 45 HRC
minimum, (e.g. balls used as ball bearings).
Injection points for the projectiles shall be provided at the 12 o'clock position, as shown in
Figures AA.2 and AA.3 and located on the cutting means tip circle for injection of
projectiles. An injection point shall be provided for each cutting means of a multispindle
appliance.
The injection tube outlets s
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