CSA C22.2 No. 220 : M91

Technical committee on consumer and commercial products
Subcommittee on C22.2 No220
Preface
Foreword
1 Scope
2 Definitions
3 General requirements
4 Construction
4.1 General
4.1.1 Electrical components
4.1.2 Physical stability
4.1.3 Use of combustible nonmetallic materials
4.1.4 Electromagnetic emissions
4.1.5 Multivoltage equipment
4.2 Enclosures
4.2.1 General
4.2.2 Sources of fire hazard
4.2.3 Reduction of fire hazard
4.2.4 Enclosure strength
4.2.5 Enclosure durability
4.2.6 Resistance to burning
4.2.7 Protection from electric shock and energy hazards
4.2.8 Control and confinement of fire hazard
4.3 Mechanical assembly
4.4 Means for preventing accidental exposure hazards
4.4.1 Interlocks
4.4.2 Capacitor discharge
4.4.3 Operator access to secondary circuits
4.4.4 Acoustic pressure
4.5 Supply connections
4.5.1 General
4.5.2 Cord-connected equipment
4.5.3 Strain relief
4.5.4 Equipment for permanent connection
4.5.5 Terminal parts and leads
4.5.6 Disconnect control devices
4.6 Interconnecting cables, cords, and communication
       cables
4.7 Current-carrying parts
4.8 Internal wiring
4.8.1 General
4.8.2 Protection
4.8.3 Insulation
4.8.4 Printed-wiring boards
4.9 Electrical insulation
4.10 Switches and controls
4.11 Overcurrent and overload protection
4.11.1 General
4.11.2 Maximum limit of primary wiring protection
4.11.3 Maximum limit of secondary wiring protection
4.11.4 Motors
4.12 Spacings
4.12.1 General
4.12.2 Spacing at field-wiring terminals
4.12.3 Spacings in primary circuits
4.12.4 Spacings in secondary circuits
4.13 Separation of circuits
4.14 Separation between telecommunication circuits and
       other circuits
4.15 Grounding
5 Marking
6 Tests
6.1 General
6.2 Conditions for test
6.2.1 Voltage
6.2.2 frequency
6.2.3 Ambient temperature
6.2.4 Equipment load
6.2.5 Temperature test conditions
6.3 Rating (input)
6.4 Temperature (normal load)
6.5 Leakage current test
6.6 Dielectric strength
6.6.1 General
6.6.2 Primary circuit
6.6.3 Secondary circuits
6.6.4 Telecommunication circuits
6.6.5 Communication cables
6.7 Abnormal test
6.7.1 General
6.7.2 Test procedure
6.8 Mechanical tests
6.8.1 Cathode ray tube enclosures
6.8.2 Impact test
6.8.3 Deflection test
6.8.4 Drop test
6.8.5 Equipment utilizing flammable liquid
6.9 Conformal coatings and absorption-resistance
6.9.1 Conformal coatings on printed-wiring boards
6.9.2 Absorption-resistance
6.10 Flammability tests
6.10.1 General
6.10.2 Materials to be classed as 5V
6.10.3 Foamed plastic materials to be classed as HF-1,
       HF-2, or HBF
6.10.4 Materials to be classed as V-0, V-1, or V-2
6.10.5 Materials to be classed as HB
6.10.6 Flammability test for nonmetallic enclosures
6.10.7 Hot wire ignition test
6.10.8 High current arc ignition test
6.10.9 Alternative flammability test for nonmetallic
       enclosures
6.11 Overload test of switches
6.12 Extreme temperature test
6.13 Flaming oil test for perforated panels
6.14 Molten PVC and copper test
6.15 Implosion test for implosion proof tubes
6.16 Test of battery-charging means
6.17 Communication
6.17.1 General
6.17.2 Strength of communication cables in tension
6.17.3 Strain relief devices
6.17.4 Plug or jack ended cables
6.18 Requirements for barriers or screens secured by
       adhesives
6.18.1 General
6.18.2 Adhesive securement test
7 Requirements for double-insulated equipment
7.1 Scope
7.2 Definitions
7.3 General requirements
7.4 Construction
7.4.1 General
7.4.2 Exposed non-current-carrying metal parts, double
       insulation
7.4.3 Mains connected transformers
7.4.4 Supply connections
7.4.5 Spacings
7.4.6 Double-insulated equipment-functional ground
7.5 Marking
7.6 Tests
7.6.1 General
7.6.2 Insulating power supply cord jacket
7.6.3 Leakage current test
7.6.4 Dielectric strength
7.6.5 Impact test
7.6.6 Abnormal test
7.6.7 Supplementary insulation test--abnormal operation

This standard is applicable to information processing equipment and associated electronic units and to business equipment intended to be connected to supply circuits with a maximum nominal voltage of 600V and designed to be operated under the conditions of normal use in a nonhazardous location when installed in accordance with the rules of the Canadian Electrical Code, Part I.