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