CSA C22.2 No. 950 : 95(R1999)

1 General
2 Fundamental design requirements
3 Wiring, connections and supply
4 Physical requirements
5 Thermal and electrical requirements
6 Connection to telecommunication networks
Annexes
A Tests for resistance to heat and fire (normative)
B Motor tests under abnormal conditions (normative)
C Transformers (normative)
D Measuring instrument for earth leakage current tests
    (normative)
E Temperature rise of a winding (normative)
F Measurement of creepage distance and clearances
    (normative)
G Earth leakage current for equipment intended to be
    connected directly to IT power systems (normative)
H Ionizing radiation (normative)
J Table of electrochemical potentials (normative)
K Thermal controls (normative)
L Normal load conditions for some types of electrical
    business equipment (normative)
M Criteria for telephone ringing and other signals
    (normative)
N Impulse test generator (normative)
P Normative references (normative)
Q Bibliography (informative)
R Examples of requirements for a quality control programme
    (informative)
S Procedure for impulse testing (informative)
T Guidance on protection against ingress of water
    (informative)
U Insulated winding wires for use as multiple layer
    insulation (normative)
NAA Markings and instructions (normative)
NAB Centralized d.c. power systems and special earthing
    requirements for d.c. powered equipment (normative)
NAC Power line failure (normative)
NAD Terminology (informative)
NAE U.S. and Canadian regulatory requirements (informative)
Tables
0 Distance through insulation of internal wiring
    0.1 Examples of application of insulation
1 Informative examples of protective devices in single-
    phase equipment or sub-assemblies
2 Informative examples of protective devices in three-
    phase equipment
3 Minimum clearances for insulation in primary circuits
    and between primary and secondary circuits
4 Additional clearances for insulation in primary circuits
    with repetitive peak voltages exceeding the peak
    value of the mains supply voltage
5 Minimum clearances in secondary circuits
6 Minimum creepage distances
7 Minimum separation distances for coated printed boards
8 Limits for inherently limited power sources
9 Limits for power sources not inherently limited
10 Sizes of cables and conduits, rated current up to 16 A
11 Sizes of conductors in power supply cords
12 Physical tests on power supply cords
13 Range of conductor sizes to be accepted by terminals
14 Sizes of terminals for primary power supply conductors
15 Size and spacing of holes in metal bottoms of fire
    enclosures
16 Temperature-rise limits - Part 1
16 Temperature-rise limits - Part 2
17 Maximum earth leakage current
18 Test voltages for electric strength tests - Part 1
18 Test voltages for electric strength tests - Part 2
B.1 Permitted temperature limits for motor windings
    (except for running overload test)
B.2 Permitted temperature limits for running overload tests
C.1 Permitted temperature limits for transformer windings
F.1 Value of X
G.1 Maximum earth leakage current for equipment connected
    to IT power systems
J.1 Electrochemical potentials
R.1 Rules for sampling and inspection - coated boards
R.2 Rules for sampling and inspection - reduced clearances
T.1 Extract from IEC 529
    NAE.1 Conduit sizes and fill
    NAE.2 Conduit and knockout sizes
    NAE.3 Maximum number of conductors in trade sizes of
           conduit or tubing
    NAE.4 Power supply cords
    NAE.5 Allowable ampacity for flexible cords and
           cables
    NAE.6 Allowable ampacity of flexible cord and
           equipment wire
    NAE.7 Maximum quantity of flammable liquid stored in
           equipment
Figures
1 Example of TN-S power system
2 Example of TN-C-S power system
3 Example of TN-C power system
4 Example of TT power system
5 Example of IT power system
5a Examples of application of insulation
6 Abrasion resistance test for coating layers
7 Impact test using sphere
7a Cathode ray tube enclosure opening
8 Examples of cross-sections of designs of openings
    preventing vertical access
9 Examples of louvre design
10 Example of enclosure side opening
11 Typical bottom of a fire enclosure for partially
    enclosed component or assembly
12 Baffle plate construction
13 Test circuit for earth leakage current on single-
    phase equipment
14 Test circuit for earth leakage current on three-
    phase equipment
15 Maximum voltage after a single fault
16 Test probe
17 Test for separation between a telecommunication
    network and earth
18 Application points of test voltage
18a Example of a line simulator for two-wire and analog
    telephone
18b Test circuit for earth leakage current on Class 1
    equipment
18c Test circuit for earth leakage current on other than
    Class 1 equipment
18d Overvoltage flowchart
19 Test finger
20 Test pin
21 Ball-pressure apparatus
    A.1 Circuit for high current arcing test
    A.2 Test fixture for hot wire ignition test
    A.3 Test arrangement for flammability test for
          classifying materials HB
    A.4 Vertical burning test for classifying materials HB
B.1/C.1 Determination of arithmetic average temperature
    D.1 Measuring instrument for earth leakage current tests
    F.1 Narrow groove
    F.2 Wide groove
    F.3 V-shaped groove
    F.4 Rib
    F.5 Uncemented joint with narrow groove
    F.6 Uncemented joint with wide groove
    F.7 Uncemented joint with narrow and wide grooves
    F.8 & F.9 Deleted
    F.10 Narrow Recess
    F.11 Wide recess
    F.12 Coating around terminals
    F.13 Coating over printed wiring
    F.14 Example of measurements in an enclosure of
          insulating material
    F.15 Intervening, unconnected conductive part
    G.1 Test circuit for earth leakage current on single-
          phase equipment for connection to IT power systems
    G.2 Test circuit for earth leakage current on three-
          phase equipment for connection to IT power systems
    M.1 Definitions of ringing period and cadence cycle
    M.2 ITS1 limit curve for cadenced ringing signal
    M.3 Peak and peak-to-peak currents
    M.4 Ringing voltage trip criteria
    M.5 Maximum a.c. and d.c. current of less than 100 Hz
    M.6 Maximum current as a function of duration
    N.1 Impulse generating circuit
    S.1 Waveform on insulation without surge suppressors
          and no breakdown
    S.2 Waveforms on insulation during breakdown without
          surge suppressors
    S.3 Waveforms on insulation with surge suppressors
          in operation
    S.4 Waveform on short-circuited surge suppressor
          and insulation
NAB.1 Typical centralized d.c. power system - plant
          and distribution source-grounded d.c. power system
NAB.2 Typical centralized d.c. power system - plant
          and distribution d.c. power system grounded
          at the equipment location
NAC.1 Circuit for common mode (longitudinal)
          overvoltage tests
NAC.2 Circuit for differential mode (metallic)
          overvoltage tests
NAC.3 Circuit for 4-wire overvoltage tests