Direct acting indicating analogue electrical measuring instruments and their accessories - Part 8: Special requirements for accessories

IEC 60051-8:2017 applies to accessories as defined in 3.1.20 of IEC 60051-1:2016.
This fifth edition cancels and replaces the fourth edition published in 1984. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) updating content in line with new editions of IEC 60051-1 and IEC 60051-9;
b) addition of Annex A to specify the nonconformity classification of test items.

Appareils mesureurs électriques indicateurs analogiques à action directe et leurs accessoires - Partie 8: Exigences particulières pour les accessoires

L'IEC 60051-8:2017 s'applique aux accessoires tels que définis au 3.1.20 de l'IEC 60051-1:2016.
Cette cinquième édition annule et remplace la quatrième édition parue en 1984. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) mise à jour du contenu en fonction des nouvelles éditions de l'IEC 60051-1 et de l'IEC 60051-9;
b) ajout de l'Annexe A pour spécifier la classification des non-conformités des éléments d'essai.

General Information

Status
Published
Publication Date
14-Dec-2017
Current Stage
PPUB - Publication issued
Completion Date
15-Dec-2017
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IEC 60051-8
Edition 5.0 2017-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Direct acting indicating analogue electrical measuring instruments and their
accessories –
Part 8: Special requirements for accessories
Appareils mesureurs électriques indicateurs analogiques à action directe et
leurs accessoires –
Partie 8: Exigences particulières pour les accessoires
IEC 60051-8:2017-12(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60051-8
Edition 5.0 2017-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Direct acting indicating analogue electrical measuring instruments and their
accessories –
Part 8: Special requirements for accessories
Appareils mesureurs électriques indicateurs analogiques à action directe et
leurs accessoires –
Partie 8: Exigences particulières pour les accessoires
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20 ISBN 978-2-8322-5192-8

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60051-8:2017 © IEC 2017
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 7

4 Description, classification and compliance ....................................................................... 7

4.1 Description ............................................................................................................. 7

4.2 Classification .......................................................................................................... 7

4.3 Compliance with the requirements of this standard ................................................. 7

4.3.1 General ........................................................................................................... 7

4.3.2 Interchangeable accessories of limited interchangeability ................................ 7

4.3.3 Non interchangeable accessories .................................................................... 8

5 Requirements .................................................................................................................. 8

5.1 Reference conditions .............................................................................................. 8

5.2 Limits of intrinsic uncertainty, fiducial value ............................................................ 8

5.2.1 Limits of intrinsic uncertainty ........................................................................... 8

5.2.2 Correspondence between intrinsic uncertainty and accuracy class .................. 8

5.2.3 Fiducial value .................................................................................................. 8

5.3 Nominal range of use and variations ....................................................................... 8

5.3.1 Nominal range of use ....................................................................................... 8

5.3.2 Limits of variations........................................................................................... 9

5.3.3 Conditions for the determination of variations .................................................. 9

5.4 Operating uncertainty, overall system uncertainty and variations ............................ 9

5.5 Electrical requirements ........................................................................................... 9

5.5.1 Electrical safety requirements .......................................................................... 9

5.5.2 Self-heating ..................................................................................................... 9

5.5.3 Permissible overloads .................................................................................... 10

5.5.4 Limiting range of temperature ........................................................................ 11

5.5.5 Deviation from zero ....................................................................................... 11

5.5.6 Electromagnetic compatibility (EMC) ............................................................. 11

5.6 Constructional requirements ................................................................................. 11

5.6.1 General constructional requirements ............................................................. 11

5.6.2 Damping ........................................................................................................ 11

5.6.3 Sealing to prevent access .............................................................................. 11

5.6.4 Scales ........................................................................................................... 11

5.6.5 Stopper.......................................................................................................... 11

5.6.6 Preferred values ............................................................................................ 11

5.6.7 Adjusters, mechanical and/or electrical .......................................................... 11

5.6.8 Effects of vibration and shock ........................................................................ 11

5.6.9 Degrees of protection provided by enclosure ................................................. 12

5.6.10 Terminals ...................................................................................................... 12

6 Information, markings and symbols ................................................................................ 12

6.1 Information ........................................................................................................... 12

6.2 Markings, symbols and their locations ................................................................... 12

6.3 Markings relating to the reference values and nominal ranges of use of

influence quantities ............................................................................................... 12

---------------------- Page: 4 ----------------------
IEC 60051-8:2017 © IEC 2017 – 3 –

6.4 The symbols for marking instruments and accessories .......................................... 12

6.5 Markings and symbols for terminals ...................................................................... 12

6.6 Instructions for use ............................................................................................... 12

7 Package ........................................................................................................................ 12

8 Test rules ...................................................................................................................... 12

Annex A (normative) Nonconformity classification of tests ................................................... 13

Bibliography .......................................................................................................................... 14

Table 1 – Limits of the nominal range of use and permissible variations ................................. 9

Table 2 – Overloads of short duration ................................................................................... 10

Table A.1 – Nonconformity classification of tests .................................................................. 13

---------------------- Page: 5 ----------------------
– 4 – IEC 60051-8:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIRECT ACTING INDICATING ANALOGUE ELECTRICAL
MEASURING INSTRUMENTS AND THEIR ACCESSORIES –
Part 8: Special requirements for accessories
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

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Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

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.

International Standard IEC 60051-8 has been prepared by IEC technical committee 85:

Measuring equipment for electrical and electromagnetic quantities.

This fifth edition cancels and replaces the fourth edition published in 1984. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) updating content in line with new editions of IEC 60051-1 and IEC 60051-9;

b) addition of Annex A to specify the nonconformity classification of test items.

---------------------- Page: 6 ----------------------
IEC 60051-8:2017 © IEC 2017 – 5 –
The text of this International Standard is based on the following documents:
CDV Report on voting
85/561/CDV 85/584A/RVC

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 International Standard is to be used in conjunction with IEC 60051-1:2016.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 60051 series, published under the general title Direct acting

indicating analogue electrical measuring instruments and their accessories, 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.
---------------------- Page: 7 ----------------------
– 6 – IEC 60051-8:2017 © IEC 2017
INTRODUCTION

IEC 60051 is published in separate parts according to the following structure and under the

general title Direct acting indicating analogue electrical measuring instruments and their

accessories.
Part 1: Definitions and general requirements common to all parts
Part 2: Special requirements for ammeters and voltmeters
Part 3: Special requirements for wattmeters and varmeters
Part 4: Special requirements for frequency meters

Part 5: Special requirements for phase meters, power factor meters and synchroscopes

Part 6: Special requirements for ohmmeters (impedance meters) and conductance meters

Part 7: Special requirements for multi-function instruments
Part 8: Special requirements for accessories
Part 9: Recommended test methods

IEC 60051-8 is not complete in itself and is read in conjunction with IEC 60051-1.

All of these parts are arranged in the same format and a standard relationship between

subject and clause number is maintained throughout these parts. This arrangement will assist

the reader of IEC 60051 to distinguish information relating to the different types of instruments.

---------------------- Page: 8 ----------------------
IEC 60051-8:2017 © IEC 2017 – 7 –
DIRECT ACTING INDICATING ANALOGUE ELECTRICAL
MEASURING INSTRUMENTS AND THEIR ACCESSORIES –
Part 8: Special requirements for accessories
1 Scope

This part of IEC 60051 applies to accessories as defined in 3.1.20 of IEC 60051-1:2016.

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 60051-1:2016, Direct acting indicating analogue electrical measuring instruments and

their accessories – Part 1: Definitions and general requirements common to all parts

3 Terms and definitions
See IEC 60051-1:2016.
4 Description, classification and compliance
4.1 Description
See IEC 60051-1:2016.
4.2 Classification

Interchangeable accessories and accessories of limited interchangeability shall be classified

in one of the accuracy classes denoted by the following class indices:
* * *
, 5 , 10
0,02, 0,05, 0,1, 0,2, 0,3, 0,5, 1, 2

NOTE The class indices marked with a star (*) are only for use with high voltage series resistors and impedances.

4.3 Compliance with the requirements of this standard
4.3.1 General
See IEC 60051-1:2016.
4.3.2 Interchangeable accessories of limited interchangeability
4.3.2.1 General

The uncertainty shall not exceed the amount specified in IEC 60051-1:2016 at all values of

the measured quantity up to and including the rated value.

Shunts and series resistors shall be tested using direct current unless a frequency is stated.

---------------------- Page: 9 ----------------------
– 8 – IEC 60051-8:2017 © IEC 2017
4.3.2.2 Interchangeable shunts

When the current taken by the associated measuring instrument is smaller than the rated

current multiplied by the class index of the shunt and divided by 300, the current taken by the

associated measuring instrument may be neglected.
4.3.3 Non interchangeable accessories

The accessory is tested in combination with its own instrument. There are no requirements

relating to limits of uncertainty for either component alone and the class index relates to the

combination.
5 Requirements
5.1 Reference conditions
See IEC 60051-1:2016.
5.2 Limits of intrinsic uncertainty, fiducial value
See IEC 60051-1:2016.
5.2.1 Limits of intrinsic uncertainty
See IEC 60051-1:2016.
5.2.2 Correspondence between intrinsic uncertainty and accuracy class
See IEC 60051-1:2016.
5.2.3 Fiducial value
The fiducial value for an interchangeable accessory or an accessory of limited

interchangeability corresponds to the rated value. The class index is marked using symbol E-1

given in Table 6 of IEC 60051-1:2016 (see Clause 6 of IEC 60051-1:2016).
5.3 Nominal range of use and variations
5.3.1 Nominal range of use
See IEC 60051-1:2016.
See Table 3 of IEC 60051-1:2016 and Table 1.
---------------------- Page: 10 ----------------------
IEC 60051-8:2017 © IEC 2017 – 9 –
Table 1 – Limits of the nominal range of use
and permissible variations

Influence quantity Limits of the nominal range of use Permissible variation expressed

unless otherwise marked as a percentage of the class index
Ripple of DC measured quantity 20 % 50 %
Distortion of AC measured quantity 20 % (with a peak factor less than 3) 100 %
Frequency of AC measured quantity Reference frequency ±10 % 100 %
Magnetic field of external origin 400 A/m 100 %
5.3.2 Limits of variations
5.3.2.1 General
See IEC 60051-1:2016.
5.3.2.2 Variation due to a magnetic field of external origin
See IEC 60051-1:2016.
Subclause 5.3.2.2 applies when relevant (e.g. to reactor boxes).

5.3.2.3 Variation due to an electric field of external origin (electrostatic instruments

only)
See IEC 60051-1:2016.
Subclause 5.3.2.3 applies when relevant (e.g. to reactor boxes).
5.3.2.4 Variation due to ferromagnetic supports
Subclause 5.3.2.4 of IEC 60051-1:2016 does not apply to accessories.
5.3.2.5 Variation due to conductive supports

See IEC 60051-1:2016. However, 5.3.2.5 does not apply to an accessory that is intended to

be supported by its associated wiring or supported by a bus bar.
5.3.3 Conditions for the determination of variations
See IEC 60051-1:2016.
5.4 Operating uncertainty, overall system uncertainty and variations
See IEC 60051-1:2016.
5.5 Electrical requirements
5.5.1 Electrical safety requirements
See IEC 60051-1:2016.
5.5.2 Self-heating
See IEC 60051-1:2016.
---------------------- Page: 11 ----------------------
– 10 – IEC 60051-8:2017 © IEC 2017
5.5.3 Permissible overloads
5.5.3.1 Continuous overload
For the recommended test, see IEC 60051-9.

Accessories, except those provided with a non-locking switch, shall be subjected to a

continuous overload of 120 % of the rated value for a period of 2 h.

After having cooled to the reference temperature, the accessory shall comply with the

requirements relating to its accuracy class.
This test shall be carried out under reference conditions.
5.5.3.2 Overloads of short duration
For the recommended tests, see IEC 60051-9.

Accessories, except those provided with a non-locking switch, shall be subjected to overloads

of short duration.

The currents and voltages for the overloads of short duration shall be the product of the

relevant factor given in Table 2 and the rated value of the shunt or the series resistor

(impedance), unless other values are stated by the manufacturer.
Table 2 – Overloads of short duration
Rated value Current factor Voltage factor Number of Duration of Interval
overloads each overload between any
(s) two overloads
(s)
Shunts of class indices 0,3 and smaller
I < 10 kA 2 – 1 0,5 –
I > 10 kA Subject to special agreement
Shunts of class indices 0,5 and greater
I < 250 A
10 – 1 5 –
250 A < I < 2 kA 5 – 1 5 –
2 kA < I < 10 kA 2 – 1 5 –
I > 10 kA Subject to special agreement
Series resistors (impedances) of class indices 0,3 and smaller
U < 2 kV – 2 5 0,5 15
U > 2 kV Subject to special agreement
Series resistors (impedances) of class indices 0,5 and 1
U < 2 kV – 2 9 0,5 60
– 2 1 5 –
U > 2 kV Subject to special agreement
Series resistors (impedances) of class indices 2 and greater
U < 2 kV – 2 9 0,5 60
– 2 1 5 –
U > 2 kV
Subject to special agreement

When two series of tests are specified, they should be both carried out in the order given.

---------------------- Page: 12 ----------------------
IEC 60051-8:2017 © IEC 2017 – 11 –

The full duration of each overload shall be applied except when an automatic cut-out (fuse)

fitted to the accessory has interrupted the circuit in less than the time specified in Table 2.

The automatic cut-out shall be reset (or the fuse replaced) before the application of the next

overload.

After having been subjected to the overloads of short duration and after having cooled to the

reference temperature, an accessory shall comply with the requirements relating to its class

index; however, the overloads shall not be repeated.
5.5.4 Limiting range of temperature
See IEC 60051-1:2016.
5.5.5 Deviation from zero
There are no requirements relating to deviation from zero for accessories.
5.5.6 Electromagnetic compatibility (EMC)
See IEC 60051-1:2016.
5.6 Constructional requirements
5.6.1 General constructional requirements
See IEC 60051-1:2016.
5.6.2 Damping
The requirements of IEC 60051-1:2016 do not apply to accessories.
5.6.3 Sealing to prevent access
See IEC 60051-1:2016.
5.6.4 Scales
There are no requirements relating to scales for accessories.
5.6.5 Stopper
See IEC 60051-1:2016.
5.6.6 Preferred values

The value of the resistance of a shunt should be such as to develop one of the voltage drops

given below:
50 mV, 60 mV, 75 mV, 100 mV, 300 mV.
5.6.7 Adjusters, mechanical and/or electrical
There are no requirements relating to adjusters for accessories.
5.6.8 Effects of vibration and shock
See IEC 60051-1:2016.
---------------------- Page: 13 ----------------------
– 12 – IEC 60051-8:2017 © IEC 2017
5.6.9 Degrees of protection provided by enclosure
See IEC 60051-1:2016.
5.6.10 Terminals
See IEC 60051-1:2016.
6 Information, markings and symbols
6.1 Information
See IEC 60051-1:2016.

A series resistor (impedance) shall be marked with its resistance (or impedance at a marked

frequency) expressed in ohms and/or with its nominal current.

These values are treated as rated values and shall be stated as required in IEC 60051-1:2016.

6.2 Markings, symbols and their locations
See IEC 60051-1:2016.

6.3 Markings relating to the reference values and nominal ranges of use of influence

quantities
See IEC 60051-1:2016.
6.4 The symbols for marking instruments and accessories
See IEC 60051-1:2016.
6.5 Markings and symbols for terminals
See IEC 60051-1:2016.
6.6 Instructions for use
See IEC 60051-1:2016.
7 Package
See IEC 60051-1:2016.
8 Test rules
See IEC 60051-1:2016.
The recommended nonconformity classification of tests is given in Annex A.

The method of acceptance inspection may be agreed between the manufacturer and the

customer.
---------------------- Page: 14 ----------------------
IEC 60051-8:2017 © IEC 2017 – 13 –
Annex A
(normative)
Nonconformity classification of tests
The recommended nonconformity classification of tests is listed in Table A.1.
Table A.1 – Nonconformity classification of tests
Test Nonconformity class
Limits of intrinsic uncertainty (5.2.1) A
Limits of variations (5.3.2) B
Electrical safety requirements (5.5.1) A
Self-heating (5.5.2) B
Permissible overloads (5.5.3) B
Limiting range of temperature (5.5.4) B
Electromagnetic compatibility (EMC) (5.5.6) B
Effects of vibration and shock (5.6.8) B
Degrees of protection provided by encl
...

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