IEC 62586-1:2017

IEC 62586-1 ®
Edition 2.0 2017-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
BASIC EMC PUBLICATION
PUBLICATION FONDAMENTALE EN CEM
Power quality measurement in power supply systems –
Part 1: Power quality instruments (PQI)

Mesure de la qualité de l'alimentation dans les réseaux d'alimentation –
Partie 1: Instruments de qualité de l'alimentation (PQI)

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IEC 62586-1 ®
Edition 2.0 2017-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
BASIC EMC PUBLICATION
PUBLICATION FONDAMENTALE EN CEM

Power quality measurement in power supply systems –

Part 1: Power quality instruments (PQI)

Mesure de la qualité de l'alimentation dans les réseaux d'alimentation –

Partie 1: Instruments de qualité de l'alimentation (PQI)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20 ISBN 978-2-8322-4358-9

– 2 – IEC 62586-1:2017 © IEC 2017
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms, definitions, symbols and abbreviated terms . 10
3.1 General definitions . 10
3.2 Terms and definitions related to environments . 11
3.3 Definitions related to uncertainty . 11
3.4 Notations . 12
3.4.1 Functions . 12
3.4.2 Symbols and abbreviated terms . 12
3.4.3 Indices . 12
4 Environmental conditions . 13
4.1 General . 13
4.2 Environments FI1, FI2, FI1-H, FI2-H, FO and FO-H . 14
4.3 Environments PI, PI-H, PO and PO-H . 15
4.4 Relationship between ambient air temperature and relative humidity . 16
5 Ratings . 17
5.1 Rated input energising voltages . 17
5.2 Rated frequencies . 17
6 Design and construction . 17
6.1 General . 17
6.2 General architecture . 17
6.3 Functions embedded in PQI-A and PQI-S . 18
6.3.1 PQI-A minimum functions definition . 18
6.3.2 PQI-S minimum functions definition . 19
6.3.3 Summary of IEC 61000-4-30 requirements for functions . 20
6.4 Additional requirements complementary to IEC 61000-4-30 . 21
6.4.1 Data to be provided for testing reasons . 21
6.4.2 Resolution of the presented data . 23
6.4.3 Clarification about “data flagging” . 23
6.4.4 Temperature drift requirement within the rated range of operation for
ambient air temperature . 23
6.5 Safety requirements . 25
6.6 EMC requirements . 25
6.6.1 Emissions . 25
6.6.2 Immunity . 25
6.7 Climatic requirements of PQI . 25
6.8 Mechanical requirements . 25
6.8.1 Product mechanical robustness . 25
6.8.2 Enclosure robustness . 25
6.9 Degree of protection by enclosures . 26
6.10 Start-up requirements . 26

7 Marking and operating instructions . 27
7.1 General . 27
7.2 Marking . 27
7.3 Operating instructions . 27
8 Functional, environmental and safety type tests. 27
8.1 General . 27
8.2 Reference conditions for type tests . 28
8.3 Safety tests . 28
8.4 EMC tests . 28
8.4.1 Emissions . 28
8.4.2 Immunity . 28
8.5 Climatic tests . 29
8.6 Mechanical tests . 30
8.6.1 Product mechanical robustness . 30
8.6.2 Degree of protection provide by enclosures for electrical equipment
against external mechanical impacts (IK code) . 31
8.6.3 Degree of protection by enclosure (IP code) . 31
8.7 Functional and uncertainty tests . 31
9 Routine tests . 32
9.1 General . 32
9.2 Protective bonding test . 32
9.3 Dielectric strength test . 32
9.4 Intrinsic uncertainty test . 32
10 Declarations . 32
11 Re-calibration and re-verification . 32
Annex A (informative) Information about environment “EMC environment G” and
environment “EMC environment H” . 33
Bibliography . 34

Figure 1 – Instrument generic measurement chain . 18
Figure 2 – Uncertainty requirement as a function of temperature . 24
Figure A.1 – Example for the situation inside a power station . 33

Table 1 – Products coding table . 13
Table 2 – Definition of class A products . 13
Table 3 – Definition of class S products . 13
Table 4 – Description of FI1, FI2, FI1-H, FI2-H, FO, FO-H environments . 15
Table 5 – Description of PI, PI-H, PO and PO-H environments . 16
Table 6 – PQI-A functions . 19
Table 7 – PQI-S minimum functions . 20
Table 8 – Summary of measurements requested for testing . 22
Table 9 – Uncertainty multipliers for different temperature ranges . 24
Table 10 – Enclosure mechanical requirements . 26
Table 11 – Minimum IP requirements . 26

– 4 – IEC 62586-1:2017 © IEC 2017
Table 12 – Characteristics specification template . 27
Table 13 – Reference conditions for testing . 28
Table 14 – Performance criteria applicable for EMC testing . 29
Table 15 – Climatic requirements . 30
Table 16 – Product mechanical requirements . 31

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
POWER QUALITY MEASUREMENT IN POWER
SUPPLY SYSTEMS –
Part 1: Power quality instruments (PQI)

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,
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agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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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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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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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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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.
International Standard IEC 62586-1 has been prepared by IEC technical committee 85:
Measuring equipment for electrical and electromagnetic quantities.
This second edition cancels and replaces the first edition published in 2013. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) integration of the new measurement functions of IEC 61000-4-30:2015 (e.g. RVC and
current functions);
b) integration of the new requirements of IEC/TS 61000-6-5:2015, update of definitions of
environment G and H, update of applicable EMC performance criteria;
c) correction of minor mistakes, improvement in specification.

– 6 – IEC 62586-1:2017 © IEC 2017
The text of this International Standard is based on the following documents:
FDIS Report on voting
85/586/FDIS 85/590/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.
It has the status of a basic EMC publication in accordance with IEC Guide 107.
A list of all parts of the IEC 62586 series, published under the general title Power quality
measurement in power supply systems, 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.
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 document using a
colour printer.
INTRODUCTION
Electricity as delivered to the customers has several characteristics that are variable and that
affect its usefulness to the customers.
Power quality instruments on the market have different characteristics. This document
provides a common system of references in order to facilitate their selection, comparison and
evaluation. This document specifies a classification based on product performance,
environment and safety.
It is acknowledged that IEC 61000-4-30 is a basic EMC publication. Detailed guidance on
instrument performance, performance verification methods, additional influence quantities and
other similar information should, in general, be found in a product standard.
IEC 62586-1 is a product standard that refers to IEC 61000-4-30, IEC 61000-4-7 and
IEC 61000-4-15 for measuring methods. IEC 62586-2 specifies functional tests and
uncertainty requirements for instruments in the scope of IEC 62586-1.
IEC 62586-1 is therefore complementing basic EMC standards with environmental, safety and
performance requirements.
– 8 – IEC 62586-1:2017 © IEC 2017
POWER QUALITY MEASUREMENT IN POWER
SUPPLY SYSTEMS –
Part 1: Power quality instruments (PQI)

1 Scope
This part of IEC 62586 specifies product and performance requirements for instruments
whose functions include measuring, recording and possibly monitoring power quality
parameters in power supply systems, and whose measuring methods (class A or class S) are
defined in IEC 61000-4-30.
These requirements are applicable in single, dual- (split phase) and 3-phase AC power supply
systems at 50 Hz or 60 Hz.
These instruments can be used:
• in the generation, transmission and distribution of electricity, for example inside a power
station, substation or a distributed generator connection;
• at the interface point between the installation and the network, e.g. in order to check the
compliance of the connection agreement between a network operator and the customer.
NOTE These instruments can also be used for other applications, e.g. inside commercial / industrial installations
especially where comparable measurements are needed (i.e. data centres or petrochemical plants).
These instruments are fixed-installed or portable. They are intended to be used both indoors
and/or outdoors.
Devices such as digital fault recorders, energy/power meters, protection relays or circuit
breakers can include power quality functions of class A or class S defined in IEC 61000-4-30.
If such devices are specified according to this document, then this document fully applies and
applies in addition to the relevant product standard. This document does not replace the
relevant product standard.
This document does not address the user interface or topics unrelated to measurement
performance of device.
This document does not cover post-processing and interpretation of the data with, for example,
dedicated software.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 60068-1, Environmental testing – Part 1: General and guidance
IEC 60068-2-1, Environmental testing – Part 2-1: Tests – Tests A: Cold
IEC 60068-2-2, Environmental testing – Part 2-2: Tests – Tests B: Dry heat

IEC 60068-2-6, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)
IEC 60068-2-14, Environmental testing – Part 2-14 Tests – Test N: Change of temperature
IEC 60068-2-27, Environmental testing – Part 2-27: Tests – Test Ea and guidance: Shock
IEC 60068-2-31, Environmental testing – Part 2-31: Tests – Test Ec: Rough handling shocks,
primarily for equipment-type specimens
IEC 60068-2-52, Environmental testing – Part 2-52: Tests – Test Kb: Salt mist, cyclic (sodium
chloride solution)
IEC 60068-2-57, Environmental testing – Part 2-57: Tests – Test Ff: Vibration – Time-history
and sine-beat method
IEC 60068-2-78, Environmental testing – Part 2-78: Tests – Test Cab: Damp heat, steady
state
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60654-1, Industrial-process measurement and control equipment – Operating conditions –
Part 1: Climatic conditions
IEC 60664-1:2007, Insulation coordination for equipment within low-voltage systems – Part 1:
Principles, requirements and tests
IEC 60721-3-1, Classification of environmental conditions – Part 3: Classification of groups of
environmental parameters and their severities – Section 1: Storage
IEC 60721-3-2, Classification of environmental conditions – Part 3: Classification of groups of
environmental parameters and their severities – Section 2: Transportation
IEC 60721-3-3, Classification of environmental conditions – Part 3: Classification of groups of
environmental parameters and their severities – Section 3: Stationary use at weatherprotected
locations
IEC 61000-4-7:2002, Electromagnetic compatibility (EMC) – Part 4-7: Testing and
measurement techniques – General guide on harmonics and interharmonics measurements
and instrumentation, for power supply systems and equipment connected thereto
Amendment 1:2008
IEC 61000-4-15, Electromagnetic compatibility (EMC) – Part 4-15: Testing and measurement
techniques – Flickermeter – Functional and design specifications
IEC 61000-4-30:2015, Electromagnetic compatibility (EMC) – Part 4-30: Testing and
measurement techniques – Power quality measurement methods
IEC 61000-6-5, Electromagnetic compatibility (EMC) – Part 6-5: Generic standards –
Immunity for power station and substation environments
IEC 61010-1:2010, Safety requirements for electrical equipment for measurement, control,
and laboratory use – Part 1: General requirements
IEC 61010-2-030, Safety requirements for electrical equipment for measurement, control, and
laboratory use – Part 2-030: Particular requirements for testing and measuring circuits

– 10 – IEC 62586-1:2017 © IEC 2017
IEC 62262, Degrees of protection provided by enclosures for electrical equipment against
external mechanical impacts (IK code)
IEC 62586-2, Power quality measurement in power supply systems – Part 2: Functional tests
and uncertainty requirements
CISPR 32, Electromagnetic compatibility of multimedia equipment – Emission requirements
3 Terms, definitions, symbols and abbreviated terms
For the purposes of this document, the terms and definitions given in IEC 61000-4-30 and the
following apply.
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
3.1 General definitions
3.1.1
power quality instrument
PQI
instrument whose main function is to measure, record and possibly monitor power quality
parameters in power supply systems, and whose measuring methods (class A or class S) are
defined in IEC 61000-4-30
3.1.2
power quality instrument class A
PQI-A
PQI whose measuring methods comply with class A of IEC 61000-4-30
3.1.3
power quality instrument class S
PQI-S
PQI whose measuring methods comply with class S of IEC 61000-4-30
3.1.4
portable instrument
portable measuring instrument
measuring instrument designed to be easily carried by hand and to be connected and
disconnected by the user
[SOURCE: IEC 60050-300:2001, 312-02-18]
3.1.5
fixed installed instrument
fixed installed measuring instrument
measuring instrument designed to be permanently mounted and which is intended to be
connected by means of permanently installed connectors
[SOURCE: IEC 60050-300:2001, 312-02-17, modified – “conductors” has been replaced by
“connectors”.]
3.1.6
panel mounted instrument
fixed installed instrument intended to be mounted in a cut out of a panel or a chassis
3.1.7
modular instrument fixed on DIN rail
fixed installed instrument intended to be used in switchgear or control gear, fixed on a DIN rail
3.1.8
housing instrument fixed on DIN rail
fixed installed instrument, intended to be fixed on a DIN rail within a control panel
3.2 Terms and definitions related to environments
3.2.1
EMC environment H
harsh EMC environment
EXAMPLE High voltage stations, arc furnaces, welding, aluminium plants.
Note 1 to entry: This environment is described in IEC 61000-6-5 as environment in substations.
3.2.2
EMC environment G
general EMC environment
EXAMPLE Power stations, MV and LV substations, extended industrial applications.
Note 1 to entry: This environment is described in IEC 61000-6-5 as environment in power stations
3.2.3
limit range of operation
extreme operating conditions that a measuring instrument can withstand without damage and
without degradation of its metrological characteristics when it is subsequently operated within
its rated operating conditions
Note 1 to entry: Measuring instrument should be able to function within the limit range of operation
3.2.4
rated range of operation
range of values of a single influence quantity that forms a part of the rated operating
conditions
Note 1 to entry: Uncertainty requirements should be met within the rated range of operation
3.3 Definitions related to uncertainty
3.3.1
intrinsic uncertainty
uncertainty of a measuring instrument when used under reference conditions
Note 1 to entry: In this document, it is the uncertainty of a measured value defined in its rated range and with all
influence quantities under reference conditions, unless otherwise stated.
[SOURCE: IEC 60359:2001, 3.2.10, modified – Note 1 to entry has been added and
instrumental was removed.]
3.3.2
influence quantity
quantity which is not the subject of the measurement and whose change affects the
relationship between the indication and the result of the measurement

– 12 – IEC 62586-1:2017 © IEC 2017
Note 1 to entry: Influence quantities can originate from the measured system, the measuring equipment or the
environment.
Note 2 to entry: As the calibration diagram depends on the influence quantities, in order to assign the result of a
measurement, it is necessary to know whether the relevant influence quantities lie within the specified range.
[SOURCE: IEC 60359:2001, 3.1.14, modified – Note 3 to entry has been deleted.]
3.3.3
variation
variation due to a single influence quantity
difference between the value measured under reference conditions and any value measured
within the rated operating range (for this specific influence quantity)
Note 1 to entry: The other performance characteristics and the other influence quantities should stay within the
ranges specified for the reference conditions.
3.3.4
rated operating conditions
set of conditions that must be fulfilled during the measurement in order that a calibration
diagram may be valid
Note 1 to entry: Beside the specified measuring range and rated operating ranges for the influence quantities, the
conditions may include specified ranges for other performance characteristics and other indications that cannot be
expressed as ranges of quantities.
[SOURCE: IEC 60359:2001, 3.3.13]
3.3.5
operating uncertainty
uncertainty under the rated operating conditions
Note 1 to entry: The operating instrumental uncertainty, like the intrinsic one, is not evaluated by the user of the
instrument, but is stated by its manufacturer or calibrator. The statement may be expressed by means of an
algebraic relation involving the intrinsic instrumental uncertainty and the values of one or several influence
quantities, but such a relation is just a convenient means of expressing a set of operating instrumental
uncertainties under different operating conditions, not a functional relation to be used for evaluating the
propagation of uncertainty inside the instrument.
[SOURCE: IEC 60359:2001, 3.2.11, modified – the word "instrumental" has been removed
from both the term and the definition.]
3.3.6
overall system uncertainty
uncertainty including the uncertainty of all components related to the measurement system
(sensors, wires, measuring instrument, etc.) under the rated operating conditions
3.4 Notations
3.4.1 Functions
See functions defined in IEC 61000-4-30.
3.4.2 Symbols and abbreviated terms
N.R. not requested
N.A. not applicable
3.4.3 Indices
min minimum value
max maximum value
4 Environmental conditions
4.1 General
This document classifies power quality instruments according to the following criteria:
• instruments that are complying either with class A measurement methods of IEC 61000-4-
30 (PQI-A) or with class S measurement methods of IEC 61000-4-30 (PQI-S);
• instruments that are either fixed installed (F) or portable (P);
• instruments that are intended to be used either indoors (I) or outdoors (O);
• instruments that are intended to be used in generic EMC environment G or in specific
harsh EMC environment H.
NOTE See Annex A for complementary information on definitions of EMC environment G and EMC environment H.
Instruments shall be named according to the coding of Table 1. The list of all allowed
instruments is given in Table 2 and Table 3.
Table 1 – Products coding table
Power quality Functions class Fixed installed (F) Indoor (I) or EMC environment
instrument (PQI) according to or portable (P) outdoor (O) G (blank) or H (-H)
IEC 61000-4-30 (A instrument application
or S)
a a
PQI-A or PQI-S -FI1, -FI2, -FO, -PI or -PO Blank or -H
a
See Table 4 and Table 5.
Table 2 – Definition of class A products
Fixed installed Portable
Indoor application Outdoor Indoor application Outdoor
application application
EMC PQI-A-FI1 PQI-A-FO PQI-A-PI PQI-A-PO
environment G
PQI-A-FI2
EMC PQI-A-FI1-H PQI-A-FO-H PQI-A-PI-H PQI-A-PO-H
environment H
PQI-A-FI2-H
NOTE FI1 is an indoor environment with uncontrolled temperature variations, while FI2 is an indoor
environment with controlled temperature variations

Table 3 – Definition of class S products
Fixed installed Portable
Indoor application Outdoor Indoor application Outdoor
application application
EMC PQI-S-FI1 PQI-S-FO PQI-S-PI PQI-S-PO
environment G
PQI-S-FI2
EMC PQI-S-FI1-H PQI-S-FO-H PQI-S-PI-H PQI-S-PO-H
environment H
PQI-S-FI2-H
NOTE FI1 is an indoor environment with uncontrolled temperature variations, while FI2 is an indoor
environment with controlled temperature variations

– 14 – IEC 62586-1:2017 © IEC 2017
4.2 Environments FI1, FI2, FI1-H, FI2-H, FO and FO-H
Those environments are dedicated to fixed-installed instruments, used:
• in EMC environment G or in EMC environment H;
• for indoor operation or outdoor operation.

Table 4 – Description of FI1, FI2, FI1-H, FI2-H, FO, FO-H environments
Environmental parameters Storage and transport Indoor operation Outdoor operation
Ambient temperature: limit IEC 60721-3-1 / 1K5 FI1: IEC 60721-3-3 / 3K6 Depends on the
a
range of operation −40 °C to +70 °C −25 °C to +55 °C geographic regions or
g
the application
IEC 60721-3-2 / 2K4 FI2: IEC 60721-3-3 / 3K5
−40 °C to +70 °C mod.: 0 °C to +45 °C At least the
requirements for indoor
operation are mandatory
Ambient temperature: rated N.A. FI1:IEC 60721-3-3 / 3K5 IEC 60721-3-3 / 3K6
b
range of operation mod. −10 °C to +45° −25 °C to +55 °C
FI2:IEC 60721-3-3 / 3K5
mod. 0 °C to +45 °C
d d d
Relative humidity: 24 h average from 5 % to 95 % from 5 % to 95 % from 5 % to 95 %
2 i
Solar radiations Negligible Negligible 1 120 W/m
Wind-driven precipitation (rain, Negligible Negligible Significant precipitation
snow, hail, etc.)
Air pollution by dust, salt, No significant air No significant air Significant air pollution

c c
smoke, corrosive/flammable pollution pollution by dust and salt.
gas, vapours
Vibration, earth tremors IEC 60721-3-1 / 1M1 IEC 60721-3-3 / 3M1 IEC 60721-3-3 / 3M1
IEC 60721-3-2 / 2M1
Electromagnetic Environment N.A. IEC 61000-6-5 IEC 61000-6-5
disturbances s FI1, FI2, Power station Power station
immunity FO environment environment
Environment N.A. IEC 61000-6-5 IEC 61000-6-5
s FI1-H, FI2- Substation environment Substation environment
H, FO-H
Altitude N.A. ≤2 000 m in general ≤2 000 m
≤4 000 m in specific ≤4 000 m in specific
h h
cases cases
Pollution degree N.A. 2 according to IEC 61010 2 or 3 according to
IEC 61010
Overvoltage category (related N.A. IEC 61010 overvoltage IEC 61010 overvoltage
e f e f
to the mains supply) category III category III
Measurement category (related N.A. IEC 61010 measurement IEC 61010 measurement

e f e f
to the measurement inputs) category III or IV category III or IV
a
See definition. Temperature may be lower on the front face of panel mounted instruments.
b
See definition.
c
These conditions correspond to maximum values given for classes 3C1 and 3S1 in IEC 60721-3-3.
d
No condensation or ice is considered.
e
If the instrument is supplied by the circuit being measured, then overvoltage category and measurement
category shall be the same category number.
f
For guidance on the selection of the correct measurement category, see IEC 61010-2-030. For guidance on
the overvoltage category, see IEC 61010-1.
g
Limit range of operation shall be specified by the manufacturer.
h
If the equipment is rated to operate at an altitude greater than 2 000 m, all clearances are multiplied by the
applicable factor specified in IEC 61010-1.
i
If provisions for sheltering are clearly specified by the manufacturer, this does not apply

4.3 Environments PI, PI-H, PO and PO-H
These environments are dedicated to portable instruments:

– 16 – IEC 62586-1:2017 © IEC 2017
• used in EMC environment G or in EMC environment H,
• for indoor or outdoor applications.
Table 5 – Description of PI, PI-H, PO and PO-H environments
Environmental parameters Storage Indoor operation Outdoor operation
Ambient temperature: limit IEC 60721-3-1/ 1K5 IEC 60721-3-3 / 3K5 Depends on the
a
range of operation −40 °C to +70 °C −5 °C to +45 °C geographic regions or
g
the application
IEC 60721-3-2 / 2K4
At least the
−40 °C to +70 °C
requirements for indoor
operation are mandatory
Ambient temperature: rated N.A. IEC 60721-3-3 / 3K5 IEC 60721-3-3 / 3K6
b
range of operation mod. 0 °C to +40 °C −5 °C to +45 °C

d d d
Relative humidity: 24 h average from 5 % to 95 % from 5 % to 95 % from 5 % to 95 %
2 i
Solar radiations Negligible Negligible 1 120 W/m
Wind-driven precipitation (rain, Negligible Negligible Significant precipitation
snow, hail, etc.)
Air pollution by dust, salt, No significant air No significant air Significant air pollution

c c
smoke, corrosive/flammable pollution pollution by dust and salt
gas, vapours
Vibration, earth tremors IEC 60721-3-1 / 1M1 IEC 60721-3-3 / 3M2 IEC 60721-3-3 / 3M2
IEC 60721-3-2 / 2M1
Electromagnetic Environ- N.A. IEC 61000-6-5 IEC 61000-6-5
disturbances ments PI or Power station Power station
immunity PO environment environment
Environ- N.A. IEC 61000-6-5 IEC 61000-6-5
ments PI-H Substation environment Substation environment
or PO-H
Altitude N.A. ≤2 000 m in general ≤2 000 m in general
≤4 000 m in specific ≤4 000 m in specific
h h
cases cases
Pollution degree N.A. 2 2 or 3
Overvoltage category (related N.A. IEC 61010 overvoltage IEC 61010 overvoltage
e f e f
to the mains) category III category III
Measurement category (related N.A. IEC 61010 measurement IEC 61010 measurement
e f e f
to the measurement inputs) category III or IV category III or IV
a
See definition.
b
See definition.
c
These conditions correspond to maximum values given for classes 3C1 and 3S1 in IEC 60721-3-3.
d
No condensation or ice is considered.
e
If the instrument is supplied by the circuit being measured, then overvoltage category and measurement
category shall be the same category number.
f
For guidance on the selection of the correct measurement category, see IEC 61010-2-030. For guidance on
the overvoltage category, see IEC 61010-1.
g
Limit range of operation shall be specified by the manufacturer.
h
If the equipment is rated to operate at an altitude greater than 2 000 m, all clearances are multiplied by the
applicable factor specified in IEC 61010-1.
i
If provisions for sheltering are clearly specified by the manufacturer, this does not apply

4.4 Relationship between ambient air temperature and relative humidity
The climatograms for classes C1 and C2 defined in Annex A of IEC 60654-1:2012 apply,
taking into account the values of Table 4 and Table 5.

5 Ratings
5.1 Rated input energising voltages
The preferred rated values
...