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BS EN IEC 60051-3:2021

BS EN IEC 60051-3:2021

$142.49

Direct acting indicating analogue electrical measuring instruments and their accessories – Special requirements for wattmeters and varmeters

Published By Publication Date Number of Pages
BSI 2021 24
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IEC 60051-3:2018 applies to direct acting indicating wattmeters and varmeters having an analogue display. IEC 60051-3:2018 also applies to: •    non-interchangeable accessories (as defined in 3.1.23 of IEC 60051-1:2016) used with wattmeters and varmeters; •    a combination of the instruments and the accessories provided that the adjustments have been made for the combination; •    direct acting indicating electrical measuring instruments whose scale marks do not correspond directly to their electrical input quantity, provided that the relationship between them is known; •    instruments and accessories having electronic devices in their measuring and/or auxiliary circuits. IEC 60051-3:2018 does not apply to: •    special purpose instruments which are covered by their own IEC standards; •    special purpose devices which are covered by their own IEC standards when they are used as accessories. IEC 60051-3:2018 cancels and replaces the fourth edition published in 1984 and Amendment 1:1994. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a)    updating of 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. IEC 60051-3:2018 is to be used in conjunction with IEC 60051-1:2016.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
7 English
CONTENTS
9 FOREWORD
11 INTRODUCTION
12 1 Scope
2 Normative references
3 Terms and definitions
4 Description, classification and compliance
4.1 Description
13 4.2 Classification
4.3 Compliance with the requirements of this standard
5 Requirements
5.1 Reference conditions
5.2 Limits of intrinsic uncertainty, fiducial value
5.2.1 Limits of intrinsic uncertainty
5.2.2 Correspondence between intrinsic uncertainty and accuracy class
Tables
Table 1 – Reference conditions and tolerances, in addition to those given in Table 2 of IEC 60051-1:2016, for testing purposes relating to the influence quantities
14 5.2.3 Fiducial value
5.3 Nominal range of use and variations
5.3.1 Nominal range of use
15 Table 2 – Limits of the nominal range of use and permissible variations in addition to those given in Table 3 of IEC 60051-1:2016
17 5.3.2 Limits of variations
5.3.3 Conditions for the determination of variations
5.3.4 Determination of variation due to power factor
5.3.5 Special tests for variations
5.4 Operating uncertainty, overall system uncertainty and variations
5.5 Electrical requirements
5.5.1 Electrical safety requirements
5.5.2 Self-heating
5.5.3 Permissible overloads
18 5.5.4 Limiting range of temperature
Table 3 – Overloads of short duration
19 5.5.5 Deviation from zero
5.5.6 Electromagnetic compatibility (EMC)
5.6 Constructional requirements
5.6.1 General constructional requirements
5.6.2 Damping
20 5.6.3 Sealing to prevent access
5.6.4 Scales
5.6.5 Stopper
5.6.6 Preferred values
5.6.7 Adjusters, mechanical and/or electrical
5.6.8 Effects of vibration and shock
5.6.9 Degrees of protection provided by enclosure
5.6.10 Terminals
6 Information, markings and symbols
6.1 Information
6.2 Markings, symbols and their locations
6.3 Markings relating to the reference values and nominal ranges of use of influence quantities
21 6.4 The symbols for marking instruments and accessories
6.5 Markings and symbols for terminals
6.5.1 Requirements for markings
6.5.2 Earthing (grounding) terminals
6.5.3 Measuring circuit terminals
6.5.4 Special markings for terminals
6.6 Instructions for use
7 Package
8 Test rules
22 Annex A (normative)Nonconformity classification of tests
Table A.1 – Nonconformity classification of tests
23 Bibliography

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BS EN IEC 60051-3:2021
$142.49