CSA C22.2 No. 253:20

Medium-voltage AC contactors, controllers, and control centres

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  CSA C22.2 No. 253:20

  November 2020

  
  

  Title: Medium-voltage AC contactors, controllers, and control centres

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  Association of Standardization and Certification NMX-J-564/106-ANCE

  Third Edition

  
  

  CSA Group

  CSA C22.2 No. 253:20

  Third Edition

  
  

  Underwriters Laboratories Inc. UL 347

  Seventh Edition

  
  

  Medium-Voltage AC Contactors, Controllers, and Control Centers

  
  

  November 23, 2020

  
  

  ANSI/UL 347-2020

  Commitment for Amendments

  
  

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  CONTENTS

  Preface 7

  1. General 9

     1. Scope and object 9

     2. Normative references, component standards, and general requirements 9

  2. Normal and Special Service Conditions 10

     1. Normal service conditions 10

     2. Special service conditions 10

  3. Definitions 11

     1. General terms 11

     2. Assemblies of controlgear 13

     3. Parts of assemblies 13

     4. Switching devices 13

     5. Parts of a controller 15

     6. Operation 16

     7. Characteristic quantities 17

3.101 Fuses 20

1. Medium-voltage fuse 21

2. Index of definitions 21

1. Controller and Control Center Ratings and Characteristics 25

   1. Rated maximum voltage (Ur) 25

   2. Rated insulation level (Ud), (Up) 25

   3. Rated frequency (fr) 26

   4. Rated continuous current and temperature rise 26

   5. Rated short-time withstand current (Ik) 26

   6. Rated peak and momentary withstand current 27

   7. Rated duration of short-circuit (tk) 27

   8. Rated supply voltage of operating devices and of auxiliary and control circuits (Ua) 28

   9. Rated supply frequency of closing and opening devices and of control circuits 28

   10. Rated pressure of compressed gas supply for installation and/or operation 28

1. Rated operational current or rated operational power (Ie) 28

2. Rated duties 28

3. Rated making and breaking capacities 28

4. Utilization category. 28

5. Mechanical endurance (standard and optional) 29

6. Electrical endurance 29

7. Coordination with medium-voltage fuses 29

8. Types and characteristics of automatic change-over devices and automatic acceleration control devices 29

9. Types and characteristics of autotransformers or reactors 29

10. Types and characteristics of the starting resistors for rheostatic motor starters 30

11. Characteristics dependent on starter type 30

12. Rated capacitive switching currents 30

1. Characteristics of Class E2 controllers 31

2. Fault-interrupting rating 31

3. Control center short-circuit rating 31

4. Starting duty of reduced-voltage starters 32

5. Duty rating for solid state resistive load controllers 33

1. Design and Construction 33

   1. Requirements for liquids. 33

   2. Requirements for gases 33

   3. Provisions for protective grounding 33

   4. Auxiliary and control equipment 35

   5. Dependent power operation 35

   6. Stored energy operation 35

   7. Independent manual operation 35

   8. Operation of releases 35

   9. Low- and high-pressure interlocking and monitoring devices 35

   10. Markings 35

   11. Interlocks 41

   12. Position indication 42

   13. Degrees of protection (optional) 43

   14. Spacings 43

   15. Gas and vacuum tightness 44

   16. Liquid tightness 44

   17. Flammability 44

   18. Electromagnetic compatibility 44

   19. X-ray emission 45

1. Types of relay or release 45

2. Enclosures 45

1. Latched controllers. 48

2. Power circuit isolating means 48

3. Equipment protection 50

4. Service equipment 51

5. Internal wiring 55

6. Terminals and connections 57

7. Bus bar connections 58

8. Connector and grounding kits 58

9. Insulating material 58

10. Wire-bending space for field-installed conductors 58

11. Field-installed accessories (kits) 59

12. Blank spaces, provision for future controllers, and spare controllers 59

13. Insulated bus (optional) 60

14. Controllers – general requirements. 60

1. Type Tests 60

   1. General 60

   2. Dielectric tests 61

   3. Radio interference voltage (RIV) test 64

   4. Resistance measurement 65

   5. Temperature-rise tests 66

   6. Short-time, momentary, and peak withstand current bus tests 71

1. Mechanical tests 73

2. Make and break capacity 74

3. Overload test 76

4. Fault interruption test 78

5. Verification of operating limits and characteristics of overload relays 82

6. Verification of coordination with SCPDs 83

7. Electrical endurance tests 83

8. Motor switching tests 83

9. Capacitive current switching tests 83

1. Switching capacity test – isolating means 85

2. Short-time capability 86

3. Driven rain test 88

4. Mechanical tests of viewing panes 89

5. Enclosure ground integrity test 89

6. Shutter integrity test 89

7. Rod entry test 89

8. Operation tests for all solid state controllers 90

1. Routine Tests 91

   1. Power-frequency voltage withstand test on the main circuit 91

   2. Power-frequency voltage withstand test on auxiliary and control circuits 92

   3. Measurement of the resistance of the main circuit 92

   4. Tightness test (vacuum integrity test) 92

   5. Design and visual checks 92

1. Operating tests 92

2. Tests dependent on controller type 93

7.201 Routine tests – general 93

TABLES 94

FIGURES 103

Annex A (Normative) – References

Annex B – (Reserved)

Annex C (Informative) – Markings required to be translated and suggested French and Spanish translations

Annex D (Informative) – Standards for components

Annex E (Normative) – Voltage Dividers Used in Medium Voltage Controllers

E1 Scope 119

E2 Definitions 119

E3 Construction 119

E4 Performance 120

E4.2 Dielectric withstand test 120

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Preface

This is the harmonized ANCE, CSA Group, and UL standard for medium-voltage ac contactors, controllers, and control centres. It is the third edition of NMX-J-564/106-ANCE, the third edition of CSA C22.2 No. 253:20, and the seventh edition of UL 347. This edition of NMX-J-564/106-ANCE supersedes the previous edition published on January 2016. This edition of CSA C22.2 No. 253 supersedes the previous edition published on January 2016. This edition of UL 347 supersedes the previous edition published on January 29, 2016.

This harmonized Standard was prepared by the Association of Standardization and Certification, CSA Group and Underwriters Laboratories Inc. The efforts and support of the medium-voltage control manufacturing industry and the CANENA Technical Harmonization Subcommittee THSC TC17 WG1 – Medium Voltage Controllers, which includes representatives of UL, CSA Group, ANCE, and North American medium voltage control manufacturers, are gratefully acknowledged.

This standard is considered suitable for use for conformity assessment within the stated scope of the standard.

The present Mexican Standard was developed by the CT GTD – Generación, Transmisión y Distribución from the Comité de Normalización de la Asociación de Normalización y Certificación, A. C., CONANCE, with the collaboration of the medium-voltage controller manufacturers and users.

This Standard was reviewed by the CSA Integrated Committee on Industrial Control, under the jurisdiction of the CSA Technical Committee on Industrial Products and the CSA Strategic Steering Committee on Requirements for Electrical Safety, and has been formally approved by the CSA Technical Committee.

Application of Standard

Where reference is made to a specific number of samples to be tested, the specified number is to be considered a minimum quantity.

Note: Although the intended primary application of this standard is stated in its scope, it is important to note that it remains the responsibility of the users of the standard to judge its suitability for their particular purpose.

Level of harmonization

This Standard was prepared by comparing UL 347, existing CSA Group standards, and ANCE and IEC 60470-2000 requirements. These requirements were reviewed, compared, and, where possible, harmonized. Where harmonization was not possible due to local installation codes, the differing requirements are noted in the text of the document. When conflicts between existing North American and IEC practices existed, the practice in North America is retained.

This Standard is published as an equivalent standard for ANCE, CSA Group, and UL.

An equivalent standard is a standard that is substantially the same in technical content, except as follows: Technical national differences are allowed for codes and governmental regulations as well as those recognized as being in accordance with NAFTA Article 905, for example, because of fundamental climatic, geographical, technological, or infrastructural factors, scientific justification, or the level of protection that the country considers appropriate. Presentation is word for word except for editorial changes.

Formatting

This Standard is formatted to facilitate comparison to IEC 60470 requirements, and to IEC 60694, which is the common clauses document to which IEC 60470 is subservient. Requirements are categorized and

arranged in the clause numbering structure currently used for IEC 60470. Where the requirements in this Standard are equivalent to those in IEC 60470, the subclause is assigned the equivalent IEC subclause number. Where this Standard does not include a subclause equivalent to those in IEC 60470, the entry "[Vacant]" is shown for the IEC 60470 subclause number. Where this Standard includes a requirement not shown in IEC 60470, the subclause is assigned a number of a higher numerical value than those used in the IEC document.

In order to simplify the cross-referencing of corresponding requirements, the following clause numbering system is used:

• The clauses follow the IEC 60470 (and IEC 60694) format for clauses 1 through 7.

  
  

• Subclauses numbered .1 through .99 (but not subdivisions, e.g., those numbered .1.1, .1.2, .1.3, etc.) correspond to subclauses in IEC 60470 (and IEC 60694).

  
  

• Subclauses numbered .101 through .199 correspond to subclauses in IEC 60470.

  
  

• Subclauses numbered .201 through .299 are CANENA requirements not found or numbered in IEC 60470.

The purpose of this Standard is to harmonize as far as practicable all rules and requirements of a general nature 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.

Interpretations

The interpretation by the standards development organization of an identical or equivalent standard is based on the literal text to determine compliance with the standard in accordance with the procedural rules of the standards development organization. If more than one interpretation of the literal text has been identified, a revision is to be proposed as soon as possible to each of the standards development organizations to more accurately reflect the intent.

MEDIUM-VOLTAGE AC CONTACTORS, CONTROLLERS, AND CONTROL CENTERS

1 General

1.1 Scope and object

This standard is applicable to ac contactors applied at voltages in the range of 1 501V to 15kV, and metal- enclosed contactor-based controllers, control centers, and other control assemblies and associated equipment applied at voltages in the range of 751V to 15kV, designed for operation at frequencies of 50 or 60 Hz on three-phase systems. These requirements cover equipment intended for use in ordinary (non- hazardous) locations and installed in accordance with the applicable local installation codes and standards (see Annex A, Item 1). These requirements, as modified by the applicable national standards for fire pump controllers, also cover fire pump controllers (see Annex A, Item 2).

This standard also includes requirements for controllers intended for service entrance applications. (See

1. and Annex A, Item 3.)

   
   

   This standard also includes requirements for equipment incorporating solid state switching elements intended for starting, stopping, regulating, controlling, or protecting heating and other resistive loads, having ac voltage ratings in the range of 1 501V to 15kV.

   
   

   This standard does not cover:

   
   

   1. equipment for use in classified (hazardous) locations as defined in the applicable installation codes or standards;

      
      

   2. components contained in contactors and contactor-based controllers for which individual component standards exist; and

      
      

   3. auxiliary low voltage control assemblies (see Annex A, Item 4).

This standard also includes requirements for reduced-voltage solid state controllers. It does not, however, cover equipment consisting solely of electronic or solid state devices, circuits, or systems, nor does it cover electronic variable speed motor controllers (power conversion equipment). This standard does not cover controllers using only solid state devices in the main circuit.

1.2 Normative references, component standards, and general requirements

1.2.1 General

Products covered by this standard shall comply with the reference installation codes and standards noted in Annex A.

For undated references to standards, such reference shall be considered to refer to the latest edition and all revisions to that edition up to the time when this standard was approved. For dated references to standards, such reference shall be considered to refer to the dated edition and all revisions published to that edition up to the time the standard was approved.