IEC 61010-2-012:2019

IEC 61010-2-012 ®
Edition 2.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ
Safety requirements for electrical equipment for measurement, control, and
laboratory use –
Part 2-012: Particular requirements for climatic and environmental testing and
other temperature conditioning equipment

Règles de sécurité pour appareils électriques de mesurage, de régulation et de
laboratoire –
Partie 2-012: Exigences particulières pour les appareils d'essais climatiques et
d'environnement, et autres appareils de conditionnement de température

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IEC 61010-2-012 ®
Edition 2.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ

Safety requirements for electrical equipment for measurement, control, and

laboratory use –
Part 2-012: Particular requirements for climatic and environmental testing and

other temperature conditioning equipment

Règles de sécurité pour appareils électriques de mesurage, de régulation et de

laboratoire –
Partie 2-012: Exigences particulières pour les appareils d'essais climatiques et

d'environnement, et autres appareils de conditionnement de température

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 19.080 ISBN 978-2-8322-6713-4

– 2 – IEC 61010-2-012:2019 © IEC 2019
CONTENTS
FOREWORD . 4
INTRODUCTION . 7
1 Scope and object . 10
2 Normative references . 11
3 Terms and definitions . 11
4 Tests . 17
5 Marking and documentation . 23
6 Protection against electric shock . 32
7 Protection against mechanical HAZARDS . 34
8 Resistance to mechanical stresses . 36
9 Protection against the spread of fire . 37
10 Equipment temperature limits and resistance to heat . 38
11 Protection against HAZARDS from fluids and solid foreign objects . 42
12 Protection against radiation, including laser sources, and against sonic and
ultrasonic pressure . 57
13 Protection against liberated gases and substances, explosion and implosion . 58
14 Components and subassemblies . 60
15 Protection by interlocks . 62
16 HAZARDS resulting from application . 64
17 RISK assessment . 65
Annexes . 66
Annex K (normative) Insulation requirements not covered by 6.7 . 67
Annex L (informative) Index of defined terms . 68
Annex AA (informative) Useful symbols . 70
Annex BB (informative) Protection of people who are inside WALK-IN EQUIPMENT . 73
Annex CC (informative) Safety requirements for components and piping . 75
Annex DD (informative) Equipment containing FLAMMABLE REFRIGERANTS – Information
and marking requirements. 80
Annex EE (normative) Non-sparking "n" electrical device . 83
Bibliography . 84

Figure 101 – Schema of a REFRIGERATING SYSTEM incorporating a CONDENSER . 8
Figure 102 – Flow chart illustrating the selection process . 9
Figure 103 – Details of scratching TOOL tip . 52

Table 1 – Symbols . 24
Table 101 – Time-temperature conditions . 30
Table 102 – Maximum temperatures for MOTOR-COMPRESSORS . 40
Table 103 – Minimum temperature for the determination of SATURATED-VAPOUR
PRESSURE of the REFRIGERANT . 47
Table 104 – REFRIGERANT flammability parameters . 56
Table AA.1 – Useful symbols . 70

Table CC.1 – Parameters of pressure vessels according to EN 14276-1 . 76
Table CC.2 – Parameters of piping according to EN 14276-2 . 77
Table CC.3 – Components and piping requirements . 78
Table CC.4 – Minimum wall thickness for copper and steel tubing . 79

– 4 – IEC 61010-2-012:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAFETY REQUIREMENTS FOR ELECTRICAL EQUIPMENT
FOR MEASUREMENT, CONTROL, AND LABORATORY USE –

Part 2-012: Particular requirements for climatic and environmental
testing and other temperature conditioning equipment

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
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6) All users should ensure that they have the latest edition of this publication.
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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 61010-2-012 has been prepared by IEC technical committee 66:
Safety of measuring, control and laboratory equipment.
It has the status of a group safety publication in accordance with IEC Guide 104.
This second edition cancels and replaces the first edition published in 2016. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) alignment with changes introduced by Amendment 1 of IEC 61010-1:2010;
b) changes related to the use of small capitals for defined terms only;
c) clarifications for cooling tests in 4.4.2.10;

d) requirements for overtemperature protection in 10.101, including deletion of the second
part of the sentence in item b), and the deletion of item c);
e) changes pertaining to the accurate employment of terms "temperature", "operating
temperature", "working temperature", "application temperature", "room temperature" and
"ambient temperature" in 3.5.104, 3.5.105, 4.3.1, 4.3.2, 5.4.2, 8.2.1, 8.2.2, 11.7.2.101.2,
11.7.2.101.3, 13.2.102, 14.102, 15.101, 15.102, 15.103, Introduction and many other
locations. For the purpose of clarification, the definition of 3.5.114, CONTROLLED
TEMPERATURE, is added.
The text of this International Standard is based on the following documents:
FDIS Report on voting
66/687/FDIS 66/688/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.
A list of all parts of the IEC 61010 series, published under the general title, Safety
requirements for electrical equipment for measurement, control, and laboratory use, can be
found on the IEC website.
IEC 61010-2-012 is to be used in conjunction with the latest edition of IEC 61010-1. It was
established on the basis of the third edition (2010) and its Amendment 1 (2016), hereinafter
referred to as Part 1.
This Part 2-012 supplements or modifies the corresponding clauses in IEC 61010-1 so as to
convert that publication into the IEC standard: Particular requirements for climatic and
environmental testing and other temperature conditioning equipment.
Where a particular subclause of Part 1 is not mentioned in this Part 2-012, that subclause
applies as far as is reasonable. Where this Part 2-012 states "addition", "modification",
"replacement", or "deletion", the relevant requirement, test specification, or note in Part 1
should be adapted accordingly.
In this standard:
1) the following print types are used:
– requirements and definitions: in roman type;
– NOTES: in smaller roman type;
– conformity and tests: in italic type;
– terms used throughout this standard which have been defined in Clause 3: SMALL
ROMAN CAPITALS.
2) subclauses, figures, tables and notes which are additional to those in Part 1 are numbered
starting from 101. Additional annexes are lettered starting from AA.

– 6 – IEC 61010-2-012:2019 © IEC 2019
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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this standard using a
colour printer.
INTRODUCTION
This Part 2-012, along with Part 2-010 and Part 2-011, taken together, address the specific
HAZARDS associated with the heating and cooling of materials by equipment and are organized
as follows:
Specifically addresses the HAZARDS associated with equipment incorporating heating
IEC 61010-2-010
systems.
Specifically addresses the HAZARDS associated with equipment incorporating REFRIGERATING
IEC 61010-2-011
SYSTEMS.
Specifically addresses the HAZARDS associated with equipment incorporating both heating
and REFRIGERATING SYSTEMS that interact with each other such that the combined heating
and REFRIGERATING SYSTEM yield additional or more severe HAZARDS for the two systems
IEC 61010-2-012
than if treated separately. It also addresses the HAZARDS associated with the treatment of
materials by other factors like irradiation, excessive humidity, CO and MECHANICAL
MOVEMENT, etc.
Guidance for the application of the appropriate Part 2 standard(s)
When the equipment includes only a material heating system, and no REFRIGERATING SYSTEM
or other environmental factors apply, then Part 2-010 applies without needing Part 2-011 or
REFRIGERATING SYSTEM, and no
Part 2-012. Similarly, when the equipment includes only a
material heating system or other environmental factors apply, then Part 2-011 applies without
needing Part 2-010 or Part 2-012. However, when the equipment incorporates both a material
heating system, and a REFRIGERATING SYSTEM or the materials being treated in the intended
application introduce significant heat into the REFRIGERATING SYSTEM, a determination should
be made as to whether the interaction between the two systems will generate additional or
HAZARDS than if the systems were evaluated separately (CONTROLLED
more severe
TEMPERATURE, see flow chart for selection process). If the interaction of the heating and
cooling functions yields no additional or more severe HAZARDS, then both Part 2-010 and
Part 2-011 apply for their respective functions. Conversely, if additional or more severe
HAZARDS result from the combining of the heating and cooling functions, or if the equipment
incorporates additional material treatment factors, then Part 2-012 applies, but not Part 2-010
or Part 2-011.
What HAZARDS are applicable for a REFRIGERATING SYSTEM?
The typical HAZARDS for a REFRIGERATING SYSTEM (see Figure 101) consisting of a MOTOR-
COMPRESSOR, a CONDENSER, an expansion device and an EVAPORATOR include but are not
limited to:
– The maximum temperature of LOW-PRESSURE SIDE (return temperature) to the MOTOR-
COMPRESSOR. A MOTOR-COMPRESSOR incorporates a REFRIGERANT cooled motor and it
should be established that the maximum temperatures of the LOW-PRESSURE SIDE under
RATINGS within the motor.
least favourable condition do not exceed the insulation
– The maximum pressure of LOW-PRESSURE SIDE at the inlet to the MOTOR-COMPRESSOR. The
housing of the MOTOR-COMPRESSOR is exposed to this pressure and so the design RATING
of the MOTOR-COMPRESSOR housing should accommodate the worst-case pressures whilst
providing the correct safety margin for a pressure vessel.
– The maximum temperature of HIGH-PRESSURE SIDE to the CONDENSER. The temperatures of
the HIGH-PRESSURE SIDE under most unfavourable conditions may present a temperature
HAZARD if the OPERATOR is exposed to them or if the electrical insulation is degraded.
– The maximum pressure of HIGH-PRESSURE SIDE at the outlet to the MOTOR-COMPRESSOR.
The REFRIGERANT components downstream of the MOTOR-COMPRESSOR up to the expansion
device are exposed to this pressure and so the design RATING of these components should
accommodate the worst-case pressures whilst providing the appropriate safety margin for
a pressure vessel.
– 8 – IEC 61010-2-012:2019 © IEC 2019
– The maximum CONTROLLED TEMPERATURES, namely, the SOAKED TEMPERATURE CONDITIONS,
from which the heat is being extracted, may impact the maximum temperature of LOW-
PRESSURE SIDE to the MOTOR-COMPRESSOR as well as present a temperature HAZARD if the
OPERATOR is exposed to them or if the electrical insulation is degraded. Whether this
CONTROLLED TEMPERATURE is derived from an integral heating function of the device or
from the heat dissipated from the material being cooled, the impact under worst case
conditions should be evaluated.
– The current draw of the equipment should be established when including the worst-case
running conditions of the REFRIGERATING SYSTEM including any defrost cycles that may
apply.
The worst-case conditions should be determined for the equipment and will include both the
NORMAL USE conditions as well as the most unfavourable testing results under
least favourable
SINGLE FAULT CONDITIONS.
Figure 101 – Schema of a REFRIGERATING SYSTEM incorporating a CONDENSER

The selection process is illustrated in the following flow chart (see Figure 102).

Figure 102 – Flow chart illustrating the selection process

– 10 – IEC 61010-2-012:2019 © IEC 2019
SAFETY REQUIREMENTS FOR ELECTRICAL EQUIPMENT
FOR MEASUREMENT, CONTROL AND LABORATORY USE –

Part 2-012: Particular requirements for climatic and environmental
testing and other temperature conditioning equipment

1 Scope and object
This clause of Part 1 is applicable except as follows:
1.1.1 Equipment included in scope
Replacement:
Replace the second paragraph by the following:
This part of IEC 61010 specifies safety requirements for electrical equipment and its
accessories within the categories a) through c), wherever it is intended to be used, whenever
that equipment incorporates one or more of the following characteristics:
– A REFRIGERATING SYSTEM that is acted on or impacted by an integral heating function such
that the combined heating and REFRIGERATING SYSTEM generates additional and/or more
severe HAZARDS than those for the two systems if treated separately.
– The materials being treated in the intended application introduce significant heat into the
REFRIGERATING SYSTEM, so that the REFRIGERATING SYSTEM in the application yields
additional and/or more severe HAZARDS than those for the REFRIGERATING SYSTEM if
operated at the maximum RATED ambient temperature alone.
– An irradiation function for the materials being treated presenting additional HAZARDS.
– A function to expose the materials being treated to excessive humidity, carbon dioxide,
salt mist, or other substances which can result in additional HAZARDS.
– A function of MECHANICAL MOVEMENT presenting additional HAZARDS.
– Provision for an OPERATOR to walk in to the operating area to load or unload the materials
being treated.
Addition:
Add the following text after the last paragraph:
NOTE 101 Examples of such equipment include environmental testing and plant growth TEST CHAMBERS,
refrigerating CIRCULATORS which incorporate heating, and recirculating coolers for extracting heat.
It is possible that all or part of the equipment falls within the scope of one or more other
Part 2 standards of IEC 61010 as well as within the scope of this standard. In that case, the
requirements of those other Part 2 standards also apply. This document is intended for
application when one or more of the additional HAZARDS described in the above dashed listed
items are introduced. However, when the equipment incorporates only a REFRIGERATING
SYSTEM or only a heating function or a combination of the two without introducing the
additional HAZARDS described in the above list, then IEC 61010-2-011 or IEC 61010-2-010 or
both, as appropriate, apply instead of this Part 2-012.
See further information in the flow chart (Figure 102) for selection process and guidance in
the Introduction.
NOTE 102 Subclause 3.1.107 and Annex BB provide the definition and requirements for the protection of people
who are inside WALK-IN EQUIPMENT.
1.1.2 Equipment excluded from scope
Addition:
Add the following items after item j):
aa) equipment for the heating, cooling, and ventilation of laboratories;
bb) sterilizing equipment.
1.2 Object
1.2.1 Aspects included in scope
Addition:
Add the following items after item g):
aa) biohazards (see 13.101);
bb) hazardous chemical substances (see 13.102).
2 Normative references
This clause of Part 1 is applicable, except as follows:
Addition:
IEC 60079-15:2010, Explosive atmospheres – Part 15: Equipment protection by type of
protection "n"
IEC 60079-20-1, Explosive atmospheres – Part 20-1: Material characteristics for gas and
vapour classification – Test methods and data
IEC 60335-2-34:2012, Household and similar electrical appliances – Safety – Part 2-34:
Particular requirements for motor-compressors
IEC 60335-2-34:2012/AMD1:2015
IEC 60335-2-34:2012/AMD2:2016
IEC 60950-1:2005, Information technology equipment – Safety – Part 1: General requirements
ISO 7010, Graphical symbols – Safety colours and safety signs – Registered safety signs
(available at https://www.iso.org/obp)
3 Terms and definitions
This clause of Part 1 is applicable except as follows:
3.1 Equipment and states of equipment
Addition:
Add the following new terms and definitions:

– 12 – IEC 61010-2-012:2019 © IEC 2019
3.1.101
BATH
complete device intended for application of CONTROLLED TEMPERATURES to SPECIMENS by
immersion in a temperature-controlled liquid HEAT TRANSFER MEDIUM
3.1.102
CIRCULATOR
equipment intended for application of CONTROLLED TEMPERATURES to an APPLICATION SYSTEM
by external circulating of a temperature-controlled liquid HEAT TRANSFER MEDIUM
3.1.103
TEST CHAMBER
ENCLOSURE or space in some part of which specified conditions can be achieved, in particular,
temperature, humidity, irradiation, low air pressure, mould growth and salt spray
3.1.104
COMBINED TEST CHAMBER
special TEST CHAMBER combined with the function of MECHANICAL MOVEMENT, for example, for
vibration, shock, impact, and similar dynamic tests
3.1.105
INCUBATOR
special TEST CHAMBER, primarily for incubation of microorganisms and tissue culture
3.1.106
SHAKER
equipment to disperse or dissolve one substance in another by MECHANICAL MOVEMENT without
the use of blades or stirrers that might destroy the structure of the substance, in particular,
BATH and shaking INCUBATOR
shaking
3.1.107
WALK-IN EQUIPMENT
TEST CHAMBER or INCUBATOR, the door of which allows the OPERATOR to enter and remain
inside the equipment even with the door closed
3.1.108
DRYING-OUT
period to wait or procedure to be carried out before operation to return the equipment to
NORMAL CONDITION if it has been transported or stored in humid conditions, or moved from a
cold environment to a much warmer one where condensation could occur, and could cause
the equipment to then fail to meet all the safety requirements of this document
3.1.109
STANDSTILL
period to wait or procedure to be carried out before operation to return the equipment to
NORMAL CONDITION if it has been transported, moved, shaken, tilted or inverted and which
could cause the equipment to then fail to meet all the safety requirements of this document
3.2 Parts and accessories
Addition:
Add the following new terms and definitions:

3.2.101
RESISTANCE-HEATING DEVICE
part of resistance-heating equipment, comprising one or more heating resistors, typically
composed of metallic conductors or an electrically conductive compound suitably insulated
and protected
[SOURCE: IEC 60050-426:2008, 426-08-08, modified – "resistance-heating unit" has been
replaced with "resistance-heating equipment".]
3.2.102
REFRIGERATING SYSTEM
combination of interconnected REFRIGERANT-containing parts constituting one closed
REFRIGERANT circuit in which the REFRIGERANT is circulated for the purpose of extracting and
rejecting heat
[SOURCE: ISO 5149-1:2014, 3.1.9, modified – the term "(heat pump)" has been deleted from
the term and the words "(i.e. cooling and heating)" have been deleted from the definition and
the note.]
3.2.103
CASCADE SYSTEM
REFRIGERATING SYSTEM consisting of two or more independent refrigeration circuits where the
CONDENSER of one system rejects heat directly to the EVAPORATOR of another
[SOURCE: EN 378-1:2008, 3.1.12, modified – "REFRIGERATING SYSTEM consisting of" has been
included.]
3.2.104
MOTOR-COMPRESSOR
refrigerating subassembly consisting of the mechanical mechanism of the compressor and the
motor, both of which are enclosed in the same sealed housing, with no external shaft seals,
and with the motor operating in a REFRIGERANT atmosphere with or without oil
Note 1 to entry: The housing may be permanently sealed, such as by welding or brazing (hermetic MOTOR-
COMPRESSOR), or may be sealed by gasketted joints (semi-hermetic MOTOR-COMPRESSOR). A TERMINAL box, a
TERMINAL boxcover, and other electrical components or an electronic control system may be included.
[SOURCE: IEC 60335-2-34:2012, 3.101, modified – "appliance" has been replaced by
"refrigerating subassembly".]
3.2.105
CONDENSER
heat exchanger in which vaporized REFRIGERANT is liquified by removal of heat
[SOURCE: ISO 5149-1:2014, 3.4.4, modified – "refrigerant vapour" has been replaced by
REFRIGERANT".]
"vaporized
3.2.106
CONDENSING UNIT
specific refrigerating subassembly combination for a given REFRIGERANT, consisting of one or
more MOTOR-COMPRESSORS, CONDENSERS, liquid receivers (when required) and the regularly
furnished accessories
3.2.107
EVAPORATOR
heat exchanger in which liquid REFRIGERANT is vaporized by absorption of heat
[SOURCE: IEC 60335-2-40:2018, 3.110, modified – "refrigerant liquid" has been replaced by
"liquid refrigerant".]
– 14 – IEC 61010-2-012:2019 © IEC 2019
3.2.108
HIGH-PRESSURE SIDE
part of a REFRIGERATING SYSTEM operating approximately at the CONDENSER pressure
[SOURCE: ISO 5149-1:2014, 3.1.7]
3.2.109
LOW-PRESSURE SIDE
part of a REFRIGERATING SYSTEM operating approximately at the EVAPORATOR pressure
[SOURCE: ISO 5149-1:2014, 3.1.8]
3.2.110
CIRCULATING PUMP
pressure and/or suction pump transporting the liquid HEAT TRANSFER MEDIUM in a BATH or
CIRCULATOR
3.2.111
CIRCULATING FAN
propeller fan or centrifugal impeller designed to circulate the air in a TEST CHAMBER or an
INCUBATOR with or without any air duct
3.2.112
HUMIDIFIER
electric device that generates a water mist or steam and releases it into a room, greenhouse
or other ENCLOSURE
3.2.113
BATH TANK
open or enclosed vessel containing the HEAT TRANSFER MEDIUM, in a BATH or CIRCULATOR
3.2.114
LIQUID CONNECTION
pipe fitting through which liquid is expelled from or discharged into a vessel or a heat
exchanger
3.2.115
VENTILATOR
TEST CHAMBER or an INCUBATOR with outside air
device for replacing air inside a
3.2.116
TEMPERATURE-LIMITING DEVICE
temperature-actuated device that is designed to prevent unsafe temperatures
[SOURCE: EN 378-1:2008, 3.6.5]
3.2.117
LIQUID LEVEL CUT OUT
liquid level-actuated device designed to prevent unsafe liquid levels
[SOURCE: EN 378-1:2008, 3.6.12]
3.2.118
PRESSURE-LIMITING DEVICE
pressure-actuated device (for example, a high-pressure switch) which is designed to stop the
operation of the pressure-imposing element and may also operate an alarm

3.2.119
PRESSURE-RELIEF DEVICE
valve or disc designed to relieve excessive pressure automatically
[SOURCE: ISO 5149-1:2014, 3.6.7, modified – "pressure relief valve or bursting disc device"
has been replaced with "valve or disc" in the definition.]
3.2.120
FLAMMABLE LIQUID
liquid capable of producing a flammable gas or vapour which, when mixed with air in certain
proportions, will form an EXPLOSIVE GAS ATMOSPHERE under any foreseeable operating
conditions
3.2.121
HEAT TRANSFER MEDIUM
medium used to transfer heat to the material being processed
3.2.122
REFRIGERANT
fluid used for heat transfer in a REFRIGERATING SYSTEM, which absorbs heat at a low
temperature and a low pressure of the fluid and rejects heat at a higher temperature and a
higher pressure of the fluid, usually involving changes of state of the fluid
[SOURCE: ISO 817:2014, 3.1.35, modified – the term "phase" has been replaced with "state"
in the definition.]
3.2.123
FLAMMABLE REFRIGERANT
REFRIGERANT with a flammability classification of A2L, A2 or A3 in accordance with ISO 817
[SOURCE: IEC 60335-2-24:2010 and IEC 60335-2-24:2010/AMD2:2017, 3.109]
3.2.124
SPECIMEN
any material, substance, or product designated to be processed, for example, in a BATH, TEST
CHAMBER or an INCUBATOR
3.2.125
APPLICATION SYSTEM
system or device intended to work with a CIRCULATOR to carry out a functional purpose
3.5 Safety terms
Addition:
Add the following new terms and definitions:
3.5.101
SATURATED-VAPOUR PRESSURE
vapour pressure at which the liquid and vapour can exist in equilibrium at a
given temperature
3.5.102
MAXIMUM ALLOWABLE PRESSURE
PS
maximum pressure for which the equipment is designed, as specified by the manufacturer
Note 1 to entry: This note applies to the French language only.

– 16 – IEC 61010-2-012:2019 © IEC 2019
[SOURCE: EN 378-1:2008, 3.3.2]
3.5.103
RATED PRESSURE
MAXIMUM ALLOWABLE PRESSURE for pressure components of equipment with regard to their
ability to withstand pressures as specified by the manufacturer
3.5.104
ACTIVE COOLING CONTROL RANGE
ACC RANGE
CONTROLLED TEMPERATURE range that is achieved by an active REFRIGERATING SYSTEM
Note 1 to entry: This note applies to the French language only.
3.5.105
FLASH POINT
lowest liquid temperature at which, under certain standardized conditions, a liquid gives off
vapours in quantity such as to be capable of forming an ignitable vapour/air mixture
Note 1 to entry: At the FLASH POINT, the vapour may cease to burn when the ignition source is removed.
[SOURCE: IEC 60050-426:2008, 426-02-14]
3.5.106
FIRE POINT
lowest temperature at which a substance ignites and continues to burn for at least 5 s after a
small flame has been applied to its surface under standardized conditions
3.5.107
AUTO IGNITION TEMPERATURE
lowest temperature at which a substance will spontaneously ignite in a normal atmosphere
without an external ignition source, such as a flame or spark
Note 1 to entry: Once ignited, the substance will continue to burn until it is either completely consumed or the
temperature of the remainder of the substance is reduced to or below its FIRE POINT.
3.5.108
LOWER EXPLOSIVE LIMIT
LEL
concentration of flammable gas or vapour in air, below which an EXPLOSIVE GAS ATMOSPHERE
will not be formed
Note 1 to entry: This note applies to the French language only.
[SOURCE: IEC 60050-426:2008, 426-02-09]
3.5.109
EXPLOSIVE GAS ATMOSPHERE
mixture with air, under atmospheric conditions, of flammable substances in the form of gas or
vapour which, after ignition, permits self sustaining flame propagation
[SOURCE: IEC 60050-426:2008, 426-01-07]
3.5.110
SOAKED TEMPERATURE CONDITION
temperature conditions when the ambient temperature of the equipment under test (EUT)
equals to ±2,0 °C of maximum ambient of 1.4.1 for NORMAL USE, storage or transport, and the
CONTROLLED TEMPERATURE of the EUT equals to ±2,0 °C of the maximum ACC RANGE with the
MOTOR-COMPRESSOR running or, the maximum RATED CONTROLLED TEMPERATURE with the
MOTOR-COMPRESSOR off
Note 1 to entry: This note applies to the French language only.
3.5.111
MECHANICAL MOVEMENT
motion of materials being processed, for example in a SHAKER or COMBINED TEST CHAMBER
3.5.112
MOVEMENT FREQUENCY
number of complete cycles of MECHANICAL MOVEMENT
3.5.113
MOVEMENT AMPLITUDE
maximum radius, distance, or angle of the MECHANICAL MOVEMENT
3.5.114
CONTROLLED TEMPERATURE
temperature where the EVAPORATOR is located and to which the LOW-PRESSURE SIDE of the
equipment is exposed, as a result of heat transfer either by active heating or from the
APPLICATION SYSTEM or SPECIMEN
Note 1 to entry: For a heat pump system, where a four-way valve is used to shift between heat and cool, the
function of CONDENSER and EVAPORATOR is exchanged.
4 Tests
This clause of Part 1 is applicable except as follows:
4.3 Reference test conditions
4.3.1 Environmental conditions
Addition:
Add the following text after item d):
Since the temperatures, pressures and current draw for a REFRIGERATING SYSTEM are
significantly impacted by ambient temperatures in a non-linear way, linear extrapolation of
test data is not possible. Therefore, tests to establish the temperatures, pressures, and
current draw for a REFRIGERATING SYSTEM shall be conducted under the following
environmental conditions:
1) an ambient temperature of 40 °C, or the maximum RATED ambient temperature, if higher;
2) the temperature of water supply is the maximum as specified by the manufacturer (see
5.4.3);
3) a relative humidity not exceeding the limits of 1.4.1 d), or the maximum RATED relative
RATED ambient temperature, if higher.
humidity at the maximum
If, as permitted by Note 2 of 1.4.1, a REFRIGERATING SYSTEM has an ambient temperature
RATING below 40 °C, the NORMAL CONDITION tests shall be performed in an environment that
matches the maximum RATED ambient temperature, and then repeated at an ambient
temperature of 40 °C. See 4.3.2.114.
4.3.2 State of equipment
4.3.2.1 General
Replacement:
Replace the first paragraph and note by the following:

– 18 – IEC 61010-2-012:2019 © IEC 2019
Unless otherwise specified, each test shall be carried out on the equipment assembled for
NORMAL USE, and under the least favourable combination of the conditions given in 4.3.2.2 to
4.3.2.13 and 4.3.2.101 to 4.3.2.114 if applicable.
When measuring temperatures, pressures, and current draws of equipment incorporating a
REFRIGERATING SYSTEM, the tests shall be started from a SOAKED TEMPERATURE CONDITION when
all pressures have fully equalized. Tests at the extremes of the input voltage (±10 %) shall
start under these voltage conditions and achieve a stable state but need not start from a
SOAKED TEMPERATURE CONDITION.
In case of doubt, a test may have to be made with more than one combination of conditions,
for example, when the equipment is operated at or cycled in between its maximum and
minimum CONTROLLED TEMPERATURES or operated in combination with excessive humidity, low
air pressure, radiation, or conditions of precipitation.
Addition:
Add the following new subclauses:
4.3.2.101 Heat load
Where the equipment or materials being processed require either the provision or extraction
of heat, the equipment under test (EUT) shall be loaded with a heat source/sink within the
manufacturer's specified conditions of use (including maximum RATED and none).
NOTE DIN 12876 (all parts) provides procedures for determining cooling capacity and efficient heating capacity of
the equipment.
4.3.2.102 Humidity and steam
Where equipment generates humidity or is intended for connection to a steam supply, it shall
be set to generate or be supplied with them within the manufacturer's specified conditions of
use (including maximum RATED and none).
4.3.2.103 Lamp and lamp systems
Illumination that provides part of the primary function (whether it be integral or an accessory),
shall be installed and operated within the manufacturer's specified conditions of use (including
maximum, off and cycled).
NOTE An example is a Xenon arc lamp used in a weather durability TEST CHAMBER.
4.3.2.104 MECHANICAL MOVEMENT
Equipment with a function of MECHANICAL MOVEMENT (for materials or HEAT TRANSFER MEDIUM)
shall be set to expose the equipment and any materials being processed to the worst
conditions (including maximum, off and cycled).
4.3.2.105 Spray generating systems
Spray generating systems of equipment shall be operated within the manufacturer's specified
conditions of use (including maximum, off and cycled).
4.3.2.106 VENTILATORS
ENTILATORS shall be operated within the manufacturer's specified conditions of use (including
V
maximum, off and cycled).
4.3.2.107 Pressures other than those of REFRIGERANT
Where equipment generates or uses pressures other than local atmospheric it shall be set to
generate, or be supplied with pressure(s) within the manufacturer's specified conditions of use
(including maximum RATED and none).
4.3.2.108
...