1 General
The purpose of this standard is to harmonize as far as practicable all rules and requirements of a general nature applicable to low-voltage switchgear and controlgear in order to obtain uniformity of requirements and tests throughout the corresponding range of equipment and to avoid the need for testing to different standards.
All those parts of the various equipment standards which can be considered as general have therefore been gathered in this standard together with specific subjects of wide interest and application, e.g. temperature-rise, dielectric properties, etc.
For each type of low-voltage switchgear and controlgear, only two main documents are necessary to determine all requirements and tests:
1) This Part, referred to as "GB 14048.1" in the specific standards covering the various types of low-voltage switchgear and controlgear;
2) The relevant equipment standard hereinafter referred to as the "relevant product standard" or "product standard".
For a general rule to apply to a specific product standard, it shall be explicitly referred to by the latter, by quoting the relevant clause or subclause number of this standard followed by "GB 14048.1" e.g. "7.2.3 of “GB 14048.1".
A specific product standard may not require, and hence may omit, a general rule (as being not applicable), or it may add to it (if deemed inadequate in the particular case), but it may not deviate from it, unless there is a substantial technical justification.
Note: The product standards due to be part of the series of IEC standards covering low-voltage switchgear and controlgear are:
Contents
Foreword V
1 General
1.1 Scope and object
1.2 Normative references
2 Definitions
2.1 General terms
2.2 Switching devices
2.3 Parts of switching devices
2.4 Operation of switching devices
2.5 Characteristic quantities
2.6 Tests
3 Classification
4 Characteristics
4.1 General
4.2 Type of equipment
4.3 Rated and limiting values for the main circuit
4.4 Utilization category
4.5 Control circuits
4.6 Auxiliary circuits
4.7 Relays and releases
4.8 Co-ordination with short-circuit protective devices (SCPD)
4.9 Switching overvoltages
5 Product Information
5.1 Nature of information
5.2 Marking
5.3 Instructions for installation, operation and maintenance
6 Normal Service, Mounting and Transport Conditions
6.1 Normal service conditions
6.2 Conditions during transport and storage
6.3 Mounting
7 Constructional and Performance Requirements
7.1 Constructional requirements
7.2.1 Operating conditions
7.3 Electromagnetic compatibility (EMC)
8 Tests
8.1 Kinds of test
8.2 Compliance with constructional requirements
8.3 Performance
8.4 Tests for EMC
Appendix A (Informative) Examples of Utilization Categories for Low-voltage Switchgear and Controlgear
Appendix B (Informative) Suitability of the Equipment When Conditions for Operation in service Differ from the Normal Conditions
Appendix C (Normative) Degrees of Protection of Enclosed Equipment
Appendix D (Informative) Examples of Clamping Units and Relationship between Clamping Unit and Connecting device
Appendix E (Informative) Description of a Method for Adjusting the Load Circuit
Appendix F (Informative) Determination of Short-circuit Power-factor or Time-constant
Appendix G (Informative) Measurement of Creepage Distances and Clearances
Appendix H (Informative) Correlation between the Nominal Voltage of the Supply System and the Rated Impulse Withstand Voltage of Equipment
Appendix I Vacant
Appendix J (Informative) Items Subject to Agreement between Manufacturer and User
Appendix K (Normative) Moisture-proof Performance and Requirements
Appendix L (Normative) Terminal Marking and Distinctive Number
Appendix M (Normative) Flammability Test
Appendix N (Normative) Requirements and Tests for Equipment with Protective Separation
Appendix O (Informative) Environmental Aspects
Appendix P (Informative) Terminal Lugs for Low Voltage Switchgear and Controlgear Connected to Copper Conductors
Appendix Q (Normative) Special Tests — Damp Heat, Salt Mist, Vibration and Shock
Appendix R (informative) Application of the Metal Foil for Dielectric Testing on Accessible Parts during Operation or Adjustment
Appendix S (Normative) Digital Inputs and Outputs
Appendix T (Normative) Extended Functions Within Electronic Overload Relays
Appendix U (Informative) Examples of Control Circuit Configurations
Bibliography
