CSA C22.2 No. 110:19

Electric storage-tank water heaters

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  CSA C22.2 No. 110:19

  December 2019

  
  

  Title: Electric storage-tank water heaters

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CSA C22.2 No. 110:19

Electric storage-tank water heaters

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CSA C22.2 No. 110:19 Electric storage-tank water heaters

Contents

Technical Committee on Consumer and Commercial Products 3 Subcommittee on Electric Storage-Tank Water Heaters 5 Preface 7

1. Scope 8

   
   

2. Reference publications 9

   
   

3. Definitions 10

   
   

4. General requirements 10

   
   

5. Construction 11

   1. General 11

   2. Enclosures for current-carrying parts 11

   3. Protection against corrosion 12

   4. Mechanical assembly 12

   5. Stability 12

      
      

      5.6	Supply connections for permanently connected heaters	13
      5.7	Supply connections for Portable cord-connected heaters	14
      5.8	Terminal parts and leads 14
      5.9	Electrical insulation 15
      5.10	Thermal insulation 15
      5.11	Wiring 15
      5.12	Heater elements 16
      5.13	Thermostats and switches 17
      5.14	Temperature controls 18
      5.14.1	Temperature-regulating controls 18
      5.14.2	Temperature-limiting controls 18
      5.15	Lampholders 18
      5.16	Overcurrent protection 19
      5.17	Electromagnetic interference (EMI) filters 19
      5.17.2	19
      5.18	Spacings 20
      5.19	Transformers 20
      5.20	Bonding 20
      5.21	Hydrostatic test pressure 20
      5.22	Working pressure 20
      5.23	Volume 21

      
      

6. Markings 21

   6.7 Scald hazard label 22

   
   

7. Tests 23

   1. General 23

      
      

      December 2019 © 2019 Canadian Standards Association 1

      CSA C22.2 No. 110:19 Electric storage-tank water heaters

      
      

   2. Rating 24

   3. Temperature 24

      1. General 24

      2. Test conditions (normal) 25

      3. Test conditions (abnormal) 26

      4. Temperature-limiting control cut-out 26

   4. Dielectric strength 26

   5. Performance of thermally operated controls 26

      1. General 26

      2. Calibration 27

      3. Overload 27

      4. Endurance 27

   6. Performance of fusible links 27

   7. Hydrostatic pressure test 28

   8. Tank capacity 28

   9. Strain relief 28

      
      

8. High-temperature water heater 29

   1. General 29

   2. Temperature controls 29

      1. Temperature-regulating controls 29

      2. Temperature-limiting controls 29

   3. Temperature-limiting control cut-out 29

Annex A (normative) — Markings — French translations 32

Annex B (normative) — Scald hazard label 34

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CSA C22.2 No. 110:19 Electric storage-tank water heaters

Preface

This is the sixth edition of CSA C22.2 No. 110 Electric storage-tank water heaters, one of a series of Standards issued under Part II of the Canadian Electrical Code. It supersedes the previous editions published in 1994, 1990, 1981, 1973, and 1957 under the title Construction and Test of Electric Storage- Tank Water Heaters.

This edition updates the 1994 edition of C22.2 No. 110. The major differences include the update of supply connection requirements, overcurrent protection requirements, spacing requirements, and strain relief test requirements. It also addresses general maintenance revisions including reference publication updates.

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

This Standard was prepared by the Subcommittee on Electric Storage-Tank Water Heaters under the jurisdiction of the Technical Committee on Consumer and Commercial Products and the Strategic Steering Committee on Requirements for Electrical Safety, and has been formally approved by the Technical Committee.

Interpretations: The Strategic Steering Committee on Requirements for Electrical Safety has provided the following direction for the interpretation of standards under its jurisdiction: “The literal text shall be used in judging compliance of products with the safety requirements of this Standard. When the literal text cannot be applied to the product, such as for new materials or construction, and when a relevant CSA committee interpretation has not already been published, CSA Group's procedures for interpretation shall be followed to determine the intended safety principle.”

Notes:

1. Use of the singular does not exclude the plural (and vice versa) when the sense allows.

2. 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.

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December 2019 © 2019 Canadian Standards Association 7

CSA C22.2 No. 110:19 Electric storage-tank water heaters

CSA C22.2 No. 110:19

Electric storage-tank water heaters

1 Scope

1.1

This Standard applies to both cord-connected and permanently connected storage-tank water heaters*, having tanks less than 610 mm inside diameter, for use on nominal system voltages of 600 V and less, and designed to be used in nonhazardous household and commercial locations in accordance with the Rules of the Canadian Electrical Code, Part I.

* For convenience only, the shorter term water heater is used herein.

1.2

This Standard applies to water heaters that provide for the storage of hot water.

Note: The water is heated by immersion heater elements within the tank, wrap-around or other form of surface contact heater elements, or electrically heated circulation type units located either within the jacket or externally. Other types of electric heating, except as excluded by Clause 1.3, may be accepted subject to investigation.

This Standard applies to the water-heater section of kitchen units, combined with a cooking range, refrigerator, water pump, etc.

1.3

This Standard does not apply to

1. immersion type water heaters (see Clause 1.2);

2. side-arm type water heaters not attached to a storage tank; or

3. immersed-electrode type water heaters.

1.4

In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the Standard.

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.

Notes to tables and figures are considered part of the table or figure and may be written as requirements.

Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.

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