IEC 60335-2-70:2002+AMD1:2007 CSV

IEC 60335-2-70
Edition 2.1 2007-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –
Part 2-70: Particular requirements for milking machines

Appareils électrodomestiques et analogues – Sécurité –
Partie 2-70: Règles particulières pour les machines à traire
IEC 60335-2-70:2002+A1:2007

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IEC 60335-2-70
Edition 2.1 2007-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –
Part 2-70: Particular requirements for milking machines

Appareils électrodomestiques et analogues – Sécurité –
Partie 2-70: Règles particulières pour les machines à traire

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CF
CODE PRIX
ICS 65.060.99 ISBN 2-8318-9086-1

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CONTENTS
FOREWORD.3
INTRODUCTION.5

1 Scope.6
2 Normative references.6
3 Definitions.6
4 General requirement.7
5 General conditions for the tests .7
6 Classification.8
7 Marking and instructions.8
8 Protection against access to live parts.10
9 Starting of motor-operated appliances .10
10 Power input and current .10
11 Heating.10
12 Void.10
13 Leakage current and electric strength at operating temperature.10
14 Transient overvoltages .10
15 Moisture resistance.11
16 Leakage current and electric strength.11
17 Overload protection of transformers and associated circuits .11
18 Endurance.11
19 Abnormal operation.11
20 Stability and mechanical hazards .12
21 Mechanical strength.12
22 Construction.12
23 Internal wiring.12
24 Components.12
25 Supply connection and external flexible cords .12
26 Terminals for external conductors.12
27 Provision for earthing .13
28 Screws and connections .13
29 Clearances, creepage distances and solid insulation .13
30 Resistance to heat and fire.13
31 Resistance to rusting.13
32 Radiation, toxicity and similar hazards.13

Annexes .14
Annex AA (informative) Examples of milking machines .14

Bibliography.18

Figure AA.1 – Example of a bucket or direct-to-can milking machine .14
Figure AA.2 – Example of a pipeline milking machine .15
Figure AA.3 – Example of a recorder milking machine .16
Figure AA.4 – Example of an independent air and milk transport milking machine.17

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60335-2-70 © IEC:2002+A1:2007 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________

HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –

Part 2-70: Particular requirements for milking machines


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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
This part of International Standard IEC 60335 has been prepared by sub-committee 61H:
Safety of electrically-operated farm appliances, of IEC technical committee 61: Safety of
household and similar electrical appliances.
This consolidated version of IEC 60335-2-70 consists of the second edition (2002)
[documents 61H/164/FDIS and 61H/169/RVD] and its amendment 1 (2007) [documents
61H/234/CDV and 61H/239/RVC].
The technical content is therefore identical to the base edition and its amendment(s) and has
been prepared for user convenience.
It bears the edition number 2.1.
A vertical line in the margin shows where the base publication has been modified by
amendment 1.

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The French version of this standard has not been voted upon.
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 milking machines.
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: 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 associated noun are also in bold.
The following differences exist in the countries indicated below:
– 25.7: Ordinary PVC sheathed supply cords are permitted (Australia, New Zealand).
The committee has decided that the contents of the base publication and its amendments will
remain unchanged until the maintenance result date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date,
the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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60335-2-70 © IEC:2002+A1:2007 – 5 –
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 and takes into account the way in which
electromagnetic phenomena can affect the safe operation of appliances.
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.
When a part 2 standard does not include additional requirements to cover hazards dealt with
in Part 1, Part 1 applies.
NOTE 1 This means that the technical committees responsible for the part 2 standards have determined that it is
not necessary to specify particular requirements for the appliance in question over and above the general
requirements.
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.
NOTE 2 Horizontal and generic standards covering a hazard are not applicable since they have been taken into
consideration when developing the general and particular requirements for the IEC 60335 series of standards. For
example, in the case of temperature requirements for surfaces on many appliances, generic standards, such as
ISO 13732-1 for hot surfaces, are not applicable in addition to Part 1 or part 2 standards.
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 which 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.

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HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –

Part 2-70: Particular requirements for milking machines



1 Scope
This clause of Part 1 is replaced by the following.
This International Standard deals with the safety of milking machines, to be used in stalls
and in the open, that are designed for milking farm animals, such as cows, the rated voltage
of the milking machine being not more than 250 V for single-phase operation and 480 V for
other operations.
NOTE 101 Examples of such machines are:
– bucket milking machines;
– direct-to-can milking machines;
– milking pipeline machines;
– recorder milking machines;
– independent air and milk transport milking machines.
NOTE 102 A detailed description of the types of milking machines covered by this standard is given in ISO 3918
and is indicated in Annex AA.
NOTE 103 The upper limit for the rated voltage of 250 V single-phase may be exceeded in cases where 480 V
split-phase motors are required.
NOTE 104 This standard applies to milking sub-assemblies supplied by one manufacturer to form a complete
milking machine. It can be used as guidance for the safety of milking machines formed from sub-assemblies
supplied by different manufacturers.
NOTE 105 Attention is drawn to the fact that:
– for milking machines intended to be used in vehicles or on board ships, additional requirements may be
necessary;
– in many countries, additional requirements are specified by the national health authorities, the national
authorities responsible for the protection of labour, the national water supply authorities and similar authorities.
2 Normative references
This clause of Part 1 is applicable.
ISO 3864-1, Graphical symbols – Safety colours and safety signs – Part 1: Design principles
for safety signs in workplaces and public areas
3 Definitions
This clause of Part 1 is applicable except as follows.

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60335-2-70 © IEC:2002+A1:2007 – 7 –
3.1.9 Replacement:
normal operation
– vacuum pumps and those of a pulsation system are operated at rated vacuum during
continuous operation;
– releaser milk pumps are operated with the vacuum system being operated at rated
vacuum of the vacuum pump;
– during milking the vacuum pump, the pulsation system and the releaser milk pump are
operated continuously according to the manufacturer's instructions,
– during cleaning the vacuum pump, the pulsation system and the releaser milk pump
and cleaning system are operated continuously according to the manufacturer's
instructions
3.101
sub-assembly
part that in association with other parts, forms a complete milking machine
3.102
milking machine
complete machine installation for milking, usually comprising vacuum and pulsation systems,
one or more clusters and other components
3.103
milking unit
assembly of milking machine components that is replicated in an installation so that more
than one animal may be milked at one time
3.104
vacuum pump
air pump that produces a vacuum in the system
3.105
pulsation system
system in which cyclic pressure changes, initiated either pneumatically or electrically, are
produced in the chambers of the milking units
3.106
releaser milk pump
device for pumping milk out of the vacuum system
3.107
rated vacuum
vacuum assigned to the vacuum pump or pulsation system by the manufacturer
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.

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5.2 Addition:
The manufacturer shall provide a suitable test-assembly and installation instructions to enable
the milking machine or its sub-assemblies to be tested.
5.101 Where tests are specified in this standard that require the milking machine to be
operated under normal operation, the tests are to be carried out for each of the normal
operation conditions given for milking and cleaning operations.
6 Classification
This clause of Part 1 is applicable except as follows.
6.1 Replacement
Milking machines or sub-assemblies shall be of class I, class II or class III. with respect to
protection against electric shock.
Class III milking machines or sub-assemblies shall have a rated voltage not exceeding
24 V.
Compliance is checked by inspection and by the relevant tests.
6.2 Addition:
Parts of a milking machine or sub-assembly that contain electrical components and that
may be cleaned with a water jet according to the instructions, shall be at least IPX6. Other
electrical parts shall be at least IPX4.
7 Marking and instructions
This clause of Part 1 is applicable except as follows.
7.1 Addition:
Milking machines or sub-assemblies that are not marked IPX6 and that are installed
according to the manufacturer's instructions, in areas where water jet cleaning is likely, shall
be marked with the substance of “DO NOT HOSE” or with symbol ISO 7000-0073 combined
with the prohibition sign of ISO 3864-1, except for colours.
Vacuum pumps and pulsation systems shall be marked with the rated vacuum in kPa.

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60335-2-70 © IEC:2002+A1:2007 – 9 –
7.6 Addition:


Do not hose


NOTE This symbol incorporates symbol ISO 7000-0073 combined with the
prohibition sign of ISO 3864-1, except for colours.

7.12 Addition:
The milking machine shall be furnished with instructions that contain all details necessary for
maintaining and operating the machine and for replacing spare parts. In particular, details
shall be given of:
– on how to clean the milking machine assembly on completion of installation;
– the frequency of maintenance procedures and details of all parts requiring replacement or
adjustment;
– the reference numbers of all parts and, where applicable, sub-assemblies used in the
installation.
The manufacturers of sub-assemblies shall provide appropriate instructions for user
maintenance of their sub-assemblies.
If the “Do not hose” symbol is marked on the appliance, its meaning shall be explained in the
instructions.
Modification:
The instructions concerning persons (including children) with reduced physical, sensory or
mental capabilities, or lack of experience and knowledge and children playing with the
appliance are not required.
7.12.1 Addition:
The manufacturer of the milking machine shall provide instructions that shall include the
substance of the following:
– a wiring diagram;
– that the installation shall be integrate into an effective equipotential bonding system;
– that parts which are not marked IPX6 shall be installed in a location where they are not
likely to be cleaned with the aid of a high pressure water jet;
– that the installation is to be installed according to the relevant section of the wiring rules.
NOTE 101 Attention is drawn to IEC 60364-7-705.
The manufacturers of sub-assemblies shall provide appropriate instructions for installation of
their sub-assemblies.

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7.14 Addition:
Markings required by the addition to 7.1 shall have a height not less than:
– 5 mm for headlines;
– 3 mm for other lettering.
The height of the “Do not hose” symbol shall be at least 25 mm.
7.15 Addition:
Each separate sub-assembly shall be marked with the relevant markings.
The “Do not hose” symbol shall be visible after the appliance has been installed.
8 Protection against access to live parts
This clause of Part 1 is applicable.
9 Starting of motor-operated appliances
This clause of Part 1 is not applicable.
10 Power input and current
This clause of Part 1 is applicable.
11 Heating
This clause of Part 1 is applicable except as follows.
11.7 Replacement:
Appliances are operated as follows
– during milking, until steady conditions are established;
– during cleaning, for the maximum time specified in the instructions.
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.

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60335-2-70 © IEC:2002+A1:2007 – 11 –
15 Moisture resistance
This clause of Part 1 is applicable.
16 Leakage current and electric strength
This clause of Part 1 is applicable.
17 Overload protection of transformers and associated circuits
This clause of Part 1 is applicable.
18 Endurance
This clause of Part 1 is not applicable.
19 Abnormal operation
This clause of Part 1 is applicable except as follows.
19.1 Addition:
The tests of 19.2 and 19.3 are replaced by the test of 19.101.
19.7 Addition:
Moving parts of vacuum pumps are locked as long as is necessary to obtain steady
conditions.
19.101 The milking machine is operated under normal operation and supplied at rated
voltage.
Any operation, or any defect that may be expected in normal use is applied. Only one fault
condition is reproduced at a time, the tests being made consecutively. During the tests, the
temperature of windings shall not exceed the values shown in Table 8.
NOTE 1 Examples of fault conditions are:
– a programme controller stopping in any position;
– disconnection and reconnection of one or more phases of the supply during any part of the programme;
– open-circuiting or short-circuiting of electrical components such as resistors, capacitors, inductors and the like;
– failure of magnetic valves;
– disconnection of the water supply;
– disconnection of the cleaning-water supply.
NOTE 2 In general, tests are limited to those cases that may be expected to give the most unfavourable results.
NOTE 3 For the purpose of these tests, thermal controls are not short-circuited.

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20 Stability and mechanical hazards
This clause of Part 1 is applicable.
21 Mechanical strength
This clause of Part 1 is applicable except as follows.
21.1 Modification:
The impact energy is increased to 1 J.
22 Construction
This clause of Part 1 is applicable except as follows.
22.1 Addition:
Enclosures of motors that are intended for installation in non-milking areas where a dusty
environment e
...