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BSI 22/30455125 DC:2022 Edition

BSI 22/30455125 DC:2022 Edition

$13.70

BS IEC 63445. System referencing conductor switching device

Published By Publication Date Number of Pages
BSI 2022 77
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PDF Pages PDF Title
8 FOREWORD
10 INTRODUCTION
12 1 Scope
2 Normative references
3 Terms and definitions
14 4 Classification
4.1 According to method of operation
4.2 Method of interlocking
4.3 According to the method of mounting
4.4 According to the type of terminals
4.4.1 SRCSD with screw-type terminals for external copper conductors
4.4.2 SRCSD with screwless type terminals for external copper conductors
4.4.3 SRCSD with flat quick-connect terminals for external copper conductors
5 Characteristics of SRCSD
5.1 Type of Isolation
5.2 Rated short-circuit capability
5.2.1 Short-circuit making capability
15 5.2.2 Short-circuit withstand capability
5.3 Switching sequence
5.4 Preferred number of Operating cycles
5.5 Operation type
5.6 Operation
16 6 Product information
6.1 Nature of information
6.1.1 Identification
6.1.2 Classification
6.1.3 Characteristics
6.2 Marking
7 Standard conditions for operation in service and for installation
7.1 Standard conditions
8 Requirements for construction and operation
8.1 Mechanical design
8.1.1 General
8.1.2 Mechanism
17 8.1.3 Clearances, creepage distances and solid insulation
8.1.3.1 General
8.1.3.2 Clearances
8.1.3.3 Creepage distances
8.1.3.4 Solid insulation
8.1.3.5 Additional requirements for control circuits connected to the main circuit
18 8.1.4 Screws, current-carrying parts and connections
8.1.4.1 Connections
8.1.4.2 Screws in engagement with a thread of insulating material
8.1.4.3 Electrical connections
8.1.4.4 Current-carrying parts
19 8.1.5 Terminals for external conductors
8.1.5.1 Terminals for external conductors shall be such that the conductors may be connected so as to ensure that the necessary contact pressure is maintained permanently.
8.1.5.2 SRCSD shall be provided with:
8.1.5.3 The means for clamping the conductors in the terminals shall not serve to fix any other component, although they may hold the terminals in place or prevent them from turning.
8.1.5.4 Terminals for rated currents up to and including 32 A shall allow the conductors to be connected without special preparation.
8.1.5.5 Terminals shall have adequate mechanical strength.
8.1.5.6 Terminals shall be so designed that they clamp the conductor without undue damage to the conductor.
20 8.1.5.7 Terminals shall be so designed that they clamp the conductor reliably and between metal surfaces.
8.1.5.8 Terminals shall be so designed or positioned that neither a rigid solid conductor nor a wire of a stranded conductor can slip out while the clamping screws or nuts are tightened.
8.1.5.9 Terminals shall be so fixed or located that, when the clamping screws or nuts are tightened or loosened, their fixings do not work loose.
8.1.5.10 Clamping screws or nuts of terminals intended for the connection of protective conductors shall be adequately secured against accidental loosening and it shall not be possible to unclamp them without the use of a tool.
8.1.5.11 Screws and nuts of terminals intended for the connection of external conductors shall be in engagement with a metal thread and the screws shall not be the thread cutting type
8.2 Protection against electric shock
21 8.3 Dielectric properties and isolating capability
8.4 Temperature-rise
8.4.1 General
8.4.2 Temperature-rise limits
8.4.3 Ambient air temperature
22 8.5 Mechanical and electrical endurance
8.6 Performance at short-circuit currents
8.7 Resistance to mechanical shock and impact
8.8 Resistance to heat
8.9 Resistance to abnormal heat and to fire
8.10 Reliability
8.11 Electromagnetic compatibility (EMC)
9 Tests
9.1 General
23 9.2 Test conditions
24 9.3 Test of indelibility of marking
9.4 Test of reliability of screws, current-carrying parts and connections
25 9.5 Test of reliability of screw-type terminals for external copper conductors
9.5.1 The terminals are fitted with copper conductors of the same type (solid, stranded or flexible) of the smallest and largest cross-sections specified in Table 7.
9.5.2 The terminals are fitted with copper conductors of the smallest and largest cross-sections specified in Table 7, solid or stranded, whichever is the more unfavourable, and the terminal screws are tightened with a torque equal to two-thirds of th…
26 9.5.3 The terminals are fitted with the largest cross-section area specified in Table 7, for stranded and/or flexible copper conductor.
9.6 Verification of protection against electric shock
9.7 Test of dielectric properties
9.7.1 Resistance to humidity
9.7.1.1 Preparation of the SRCSD for test
27 9.7.1.2 Test conditions
9.7.1.3 Test procedure
9.7.1.4 Condition of the SRCSD after the test
9.7.2 Insulation resistance of the main circuit
28 9.7.3 Dielectric strength of the main circuit
9.7.4 Insulation resistance and dielectric strength of auxiliary circuits
29 9.7.5 Secondary circuit of detection transformers
9.7.6 Capability of control circuits connected to the main circuit withstanding high DC voltages due to insulation measurements
9.7.7 Verification of impulse withstand voltages
9.7.7.1 General testing procedure for the impulse withstand voltage tests
30 9.7.7.2 Verification of clearances with the impulse withstand voltage
31 9.7.7.3 Verification of resistance of the insulation of open contacts against an impulse voltage (suitability for isolation)
9.8 Test of temperature-rise
9.8.1 Ambient air temperature
9.8.2 Test procedure
9.8.3 Measurement of the temperature of parts
32 9.8.4 Temperature-rise of a part
9.9 Verification of the operating characteristics
9.9.1 Verification of the operating characteristics under residual current conditions
9.9.2 Verification of the operating characteristic under overcurrent conditions
9.9.2.1 Test of time-(over)current characteristic
9.10 Verification of mechanical and electrical endurance
9.10.1 General test conditions
9.10.2 Test procedure
33 9.10.3 Condition of the SRCSD after test
9.11 Short-circuit tests
9.11.1 General conditions for test
9.11.2 Test circuit for short-circuit performance
34 9.11.3 Values of test quantities
9.11.4 Tolerances on test quantities
9.11.5 Calibration of the test circuit
9.11.6 Interpretation of records
9.11.7 Condition of the SRCSD for test
35 9.11.7.1 Test in free air
9.11.7.2 Test in enclosures
9.11.8 Behaviour of the SRCSD during short-circuit tests
9.11.9 Test procedure
9.11.9.1 General
9.11.9.2 Capacity to withstand short circuit
9.11.9.3 Closing under short circuit conditions
9.11.10 Verification of the SRCSD after short-circuit test
36 9.12 Verification of resistance to mechanical shock and impact
9.12.1 Mechanical shock
9.12.1.1 Test apparatus
9.12.1.2 Test procedure
9.12.2 Mechanical impact
37 9.12.2.1 Test for all SRCSD
39 9.12.2.2 Test for SRCSD intended to be mounted on a rail
9.13 Test of resistance to heat
9.13.1 Test on complete SRCSD
9.13.2 Ball pressure test
41 9.14 Test of resistance to abnormal heat and to fire
42 9.15 Verification of proper functioning of an SRCSD
9.16 Verification of reliability
9.16.1 Climatic test
9.16.1.1 Testing chamber
9.16.1.2 Severity
9.16.1.3 Test procedure
43 9.16.1.4 Recovery
9.16.1.5 Final verification
9.16.2 Test with temperature of 40 C
44 9.17 Verification of withstand against ageing
9.18 Electromagnetic compatibility (EMC)
9.19 Test of resistance to rusting
9.20 Verification of the behaviour of the SRCSD under temporary over voltage (TOV) conditions
9.20.1 General
45 9.20.2 TOV test for SRCSD
63 Annex A (normative) Test sequence and number of samples to be submitted for certification purposes
A.1 Test sequences
64 A.2 Number of samples to be submitted for full test procedure
65 Annex B (normative) Determination of clearances and creepage distances
B.1 General
B.2 Orientation and location of a creepage distance
B.3 Creepage distances where more than one material is used
B.4 Creepage distances split by floating conductive part
B.5 Measurement of creepage distances and clearances
70 Annex C (normative) Arrangement for the detection of the emission of ionized gases during short-circuit tests
73 Annex D (informative) Examples of terminal designs
76 Annex E (informative) Correspondence between ISO and AWG copper conductors
77 Bibliography

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