C22.2 No. 145-11

(reaffirmed 2020)

Electric motors and generators for use in hazardous (classified) locations

REVISED NOVEMBER 2018

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  Revision History

  C22.2 No. 145-11, Electric motors and generators for use in hazardous (classified) locations — originally published May 2011

  
  

  Note: For information about the Standards Update Service or if you are missing any updates go to store.csagroup.org or techsupport@csagroup.org.

  
  

  Revisions issued:

  Update No. 1 — May 2017; and Update No. 2 — November 2018

  
  

  Update No. 3 — December 2020	Revision symbol (in margin)
  Cover, Copyright page, Preface, and Annexes A and B Note: Only the revised pages have been provided.	|

  MAY 31, 2011 NMX-J-652-ANCE  CSA C22.2 NO. 145-11  UL 674 3

  CONTENTS

  Preface 6

  1. Scope 8

  2. Conditions for Use 8

  3. Normative References 9

  4. Dated and Undated References 9

  5. Defi nitions 9

  6. Components 10

  7. Units of Measurement 10

  8. Terminology 10

  9. Zone and Group Equivalency 10

     1. Class I, Zone 1, Group IIA 10

     2. Class I, Zone 1, Group IIB 11

     3. Class I, Zone 1, Group IIB+H2 11

     4. Zone 20 and 21 11

  10. Enclosures 11

      1. Material 11

      2. Porosity in castings 12

      3. Thickness 12

      4. Strength 13

  11. Joints in Enclosure 13

      1. General 13

      2. Groups C and D locations 14

      3. Group B locations 15

      4. Class II Locations 17

      5. Class I and II Locations - Main poles and interpoles of D.C. motors 18

  12. Holes in Enclosure 18

  13. Shaft Openings 19

      1. General 19

      2. Groups F and G locations 20

      3. Group E locations 21

  14. Drain and Breather Plugs in Enclosure 21

  15. Air-Gap Gauge Plugs in Enclosure 21

  16. Devices with Operating Rods or Spindles 21

  17. Protection Against Corrosion 22

      1. General 22

      2. Submersible sewage-pump motor 22

  18. Materials Applied to Joint Surfaces 22

  19. Field-Wiring Connections 22

      1. Permanently connected motors 22

      2. Field wiring leads 24

      3. Equipment grounding terminals and leads 27

  20. Cord-Connected Motors 28

      1. General 28

      2. Terminal enclosure 29

      3. Conductor seal 29

      4. Packing gland 29

      5. Strain relief 30

      6. Bonding for grounding 30

      7. Equipment grounding 31

         4 NMX-J-652-ANCE  CSA C22.2 NO. 145-11  UL 674 MAY 31, 2011

      8. Attachment of threaded parts 32

  21. Assemblies of Equipment 32

      1. General 32

      2. Electric brake 32

  22. External Fans and Fan Guards 32

      1. Materials 32

      2. Fan-cooled motor 32

  23. Gasoline Submersible Motors 33

      1. General 33

      2. Lubrication 33

      3. Mechanical seal 33

  24. Leakage Detectors 33

      1. Submersible sewage-pump motor 33

      2. Cord-connected submersible sewage-pump motor 33

  25. Maximum External Surface Temperatures 33

  26. Devices for Limiting External Surfaces Temperatures 34

  27. Spacings 34

      1. Motors rated 1500 volts or less 34

      2. Motors rated more than 1500 volts 37

  28. Test Voltages and Test Conditions 37

  29. Instrumentation – Temperature Measurements 38

  30. Variable-Frequency Inverter-Drive Motors 39

  31. Temperature Tests – General 39

  32. Temperature Tests on Sinewave Power for Single Speed or Multi-Speed Motors 39

      1. Normal temperature test 39

      2. Running-overload test 40

      3. Running-overload to burnout test 40

      4. Single-phasing test 40

      5. Locked-rotor test 40

      6. 72-Hour locked-rotor test 41

      7. Air test 41

      8. Dry-dust blanket test 41

      9. Moist-dust blanket test – Group G locations 42

  33. Temperature Tests for Variable-Frequency Inverter-Drive Motors 42

      1. Normal temperature test 42

      2. Running-overload test 43

      3. Running-overload to burnout test 43

      4. Locked-rotor test 43

      5. Air test 44

      6. Dry-dust blanket test 44

      7. Moist-dust blanket test – Group G locations 45

      8. Tests on fan-duty and air-over motors with temperature-limiting devices 45

  34. Dielectric-Voltage Withstand Test 45

  35. Dust-Penetration Test 46

  36. Explosion Test 47

      1. General 47

      2. Explosion pressure test 48

      3. Flame propagation test 49

      4. Exceptions for non-standard joints 49

  37. Over Pressure Test on Enclosures 49

  38. Tests on Temperature-Limiting Devices for Limiting External Surface Temperature 50

      1. Arc-rupturing tests for thermal cut-off device in D.C. motor circuit 50

      2. Temperature-limiting device in the motor-control circuit 50

         MAY 31, 2011 NMX-J-652-ANCE  CSA C22.2 NO. 145-11  UL 674 5

      3. Overload test 50

      4. Endurance test 50

      5. Calibration test 51

  39. Secureness Test on Conduit Hubs 51

  40. Electrical-Resistance Test 51

  41. Accelerated-Aging Test on Bushings 51

  42. Cord-Pull Test 52

  43. Rough-Usage Test 52

  44. Drop Test 53

  45. Gasoline-Leakage Test 53

  46. Non-Metallic Fans and Fan Guards Test 53

      1. General 53

      2. Conductivity test 53

      3. Accumulation of static electricity test 54

  47. Pull Test on Tubes 55

  48. Sealing Compounds Test 55

  49. Low Ambient-Duty Motors 57

      1. General 57

      2. Construction 57

      3. Explosion test 58

      4. Drop test on lead seal 58

      5. Manufacturing and Production Tests – Dielectric Voltage-Withstand Test 58

  50. Grounding-Continuity Test 59

  51. Markings 59

Annex A (normative) Standard References

Annex B (informative) Standards for components

B1 Component Standards 92

Annex C (normative) Construction for Waiver of Explosion Tests

C1 Explosion tests per the exception to 36.1.2 93

C2 Joints 93

C2.1 General 93

C2.2 Threaded Joints 93

C2.3 Bolts in Joint Width 93

C2.4 Through-bolts 94

C3 Shaft Openings 94

C3.1 Class I Locations 94

8 NMX-J-652-ANCE  CSA C22.2 NO. 145-11  UL 674 MAY 31, 2011

1. Scope

   
   

   1. This standard applies to electric motors and generators or submersible and nonsubmersible sewage pumps and systems suitable for use in Class I, Division 1, Groups B, C and D, and Class II, Division 1, Groups E, F and G, hazardous (classifi ed) locations as defi ned by the Canadian Electrical Code, C22.1 Part I (CEC), and the National Electrical Code, ANSI/NFPA 70 (NEC).

      
      

   2. This standard covers the same type of electrical equipment indicated in 1.1 for installation and use in Class I, Zone 1, Groups IIA and IIB, IIB+H2, and Zone 20 and 21 hazardous locations.

      
      

   3. This standard also covers other rotating machinery such as, but not limited to, electric brakes, tachometers, encoders, and slip rings.

      
      

   4. This standard does not address types of protection other than explosion-proof or dust-ignition-proof.

      
      

   5. For Canada Only - This standard does not include Canadian energy efficiency or product performance requirements. For such requirements, see Annex A, item 19. It is possible that item 19 is referenced in whole or in part in federal, provincial, territorial, or local laws or regulations relating to energy efficiency or product performance. The appropriate governmental authorities should be consulted to confi rm whether item 19 has been referenced in laws or regulations.

      
      

      Note: This standard also does not include U.S. energy efficiency requirements for electric motors used in hazardous (classifi ed) locations.

      
      

2. Conditions for Use

   
   

   1. This standard covers motors and generators intended for use under the conditions specifi ed in 2.2 – 2.6.

      
      

   2. Normal ambient duty conditions are defi ned by the following:

      
      

      1. An oxygen concentration not to exceed 21% by volume.

         
         

      2. A nominal barometric pressure of 101.4 kPa (14.7 psia) (1 atmosphere).

         
         

      3. Temperature range of minus 25°C to +40°C.

         
         

      4. Altitude not exceeding 1000 m (3281 ft).

         
         

         In Canada, the normal ambient temperature is minus 50°C to +40°C.

         
         

   3. Low ambient duty conditions are considered to be not less than minus 70°C.

      
      

   4. Products intended and marked for an ambient of lower than minus 25°C shall be tested (e.g.: explosion pressure test) at 5°C below the marked lower temperature.

In Canada, products intended and marked for an ambient of lower than minus 50°C shall be tested (e.g.: explosion pressure test) at 5°C below the marked lower temperature.