CSA C22.2 No. 234 : 1990

Technical Committee on Consumer and Commercial Products
Subcommittee on C22.2 No 234
Preface
Foreword
Reference Material
Introduction
1 General
    1.1 Scope
    1.2 Definition
    1.3 General Requirements
    1.4 General Conditions for Tests
    1.5 Components
    1.6 Power interface
    1.7 Marking and Instructions
2 Fundamental Design and Construction Requirements
    2.1 Protection Against Electric Shock and Energy
         Hazards
    2.2 Insulation
    2.3 Safety Extra-Low Voltage (SELV) Circuits
    2.4 Limited Current Circuits
    2.5 Provision for Protective Earthing
    2.6 Primary Power Isolation
    2.7 Overcurrent and Earth Fault Protection in
         Primary Circuits
    2.8 Not used
    2.9 Creepages Distances, Clearances, and Distances
         through Insulation
3 Wiring, Connections, and Supply
    3.1 Wiring
    3.2 Connection to Primary Power
    3.3 Wiring Terminals for External Primary Power
         Supply Conductors
4 Physical Requirements
    4.1 Not used
    4.2 Mechanical Strength and Stress Relief
    4.3 Construction Details
    4.4 Resistance to Fire
5 Thermal and Electrical Requirements
    5.1 Heating
    5.2 Earth Leakage Current
    5.3 Electric Strength
    5.4 Abnormal Operating and Fault Conditions
APPENDICES
A Tests for Resistance to Heat and Fire
B Motor Tests Under Abnormal Conditions
C Transformers
D Measuring Instrument for Earth Leakage Current Test
E Temperature Rise of a Winding
F Measurement of Creepage Distances and Clearances
G Earth Leakage Current for Power Supplies Intended to
    be Connected Directly to IT Power Systems
H Not used
I Not used
J Not used
K Table of Electrochemical Potentials
L Not used
M Not used
Z High-Voltage Components and Assemblies
Tables
1 Protective Devices in Single-phase Equipment of Sub-
    Assemblies
2 Protective Devices in Three-Phase Equipment
3 Minimum Clearances for Insulation in Primary Circuits
    and Between Primary and Secondary Circuits
3(a) Additional Clearance Distances for Primary Circuits
      with Repetitive Peak Voltages Exceeding the Peak
      Value of the Supply Voltage
4 Minimum Clearances in Secondary Circuits
5 Minimum Creepage Distances
6 Minimum Separation Distances for Coated Printed
    Boards
10 Range of Conductor Sizes to be Accepted by Terminals
11 Sizes of Terminals for Primary Power Supply
    Conductors
13 Temperature-rise Limits
    Part 1
    Part 2
14 Maximum Earth Leakage Current
15 Test Voltage for Electric Strength Tests
    Part 1
    Part 2
B1 Permissible Temperature Limits for Motor Windings
    (Except for Running Overload Test)
B2 Permissible Temperature Limits for Running Overload
    Tests
C1 Permissable Temperature Limits of Transformer
    Windings
C2 Electric Strength Tests
G1 Maximum Earth Leakage Current for Power Supplies
    Intended to be Connected Directly to IT Power
    Systems
CAN-1 Largest Acceptable Protective Device
Figures
1 Abrasion Resistance Test for Coating Layers
7 Test Circuit for Earth Leakage Current on Single-
    Phase Power Supplies
8 Test Circuit for Earth Leakage Current on Three-
    Phase Power Supplies
10 Test Finger
12 Ball-Pressure Apparatus
A1 Circuit for High Current Arcing Test
A2 Test Fixture for Hot Wire Ignition Test
A3 Test Arrangement for Flammability Test for
    Classifying Materials HB
C1 Grades of Insulation in Transformers
D1 Measuring Instrument for Earth Leakage Current Test
F1-F13 Measurement of Creepage Distances and Clearances
G1 Test Circuit for Earth Leakage Current on Single-
    Phase Power Supplies for Connection to IT Power
    Systems
G2 Test for Earth Leakage Current on Three-Phase Power
    Supplies for Connection to IT Power Systems


  

Refers to (a) Power supplies that are primarily to be used in equipment which itself is to be used in accordance with the Canadian Electrical Code: (b) Power supplies with: (i) rated input voltage not exceeding 750 Vrms or dc: (ii) rated input not to exceed 200 kV.A; (iii) rated output voltage not to exceed 30kV rms or dc; (c) Power supplies that can be: (i) built in; or (ii) integral with a host; equipment. The suitability of the combination is determined in the final application.