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BS EN 60898-1:2019+A11:2024

$215.11

Electrical accessories. Circuit-breakers for overcurrent protection for household and similar installations – Circuit-breakers for a.c. operation

Published By Publication Date Number of Pages
BSI 2024 154
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PDF Pages PDF Title
2 undefined
16 CONTENTS
22 FOREWORD
24 1 Scope
25 2 Normative references
26 3 Terms and definitions
3.1 Devices
27 3.2 General terms
29 3.3 Constructional elements
32 3.4 Conditions of operation
3.5 Characteristic quantities
37 3.6 Definitions related to insulation co-ordination
39 4 Classification
4.1 General
4.2 According to the number of poles:
4.3 According to the protection against external influences:
4.4 According to the method of mounting:
4.5 According to the methods of connection
4.5.1 According to the fixation system:
40 4.5.2 According to the type of terminals:
4.6 According to the instantaneous tripping current (see 3.5.17)
4.7 According to the I2t characteristic
5 Characteristics of circuit-breakers
5.1 List of characteristics
5.2 Rated quantities
5.2.1 Rated voltages
41 5.2.2 Rated current (In)
5.2.3 Rated frequency
5.2.4 Rated short-circuit capacity (Icn)
5.3 Standard and preferred values
5.3.1 Preferred values of rated voltage
42 5.3.2 Preferred values of rated current
5.3.3 Standard values of rated frequency
5.3.4 Values of rated short-circuit capacity
Tables
Table 1 – Preferred values of rated voltage
43 5.3.5 Standard ranges of instantaneous tripping
5.3.6 Standard values of rated impulse withstand voltage (Uimp)
Table 2 – Ranges of instantaneous tripping
44 6 Marking and other product information
Table 3 – Rated impulse withstand voltage as a function of the nominal voltage of the installation
47 7 Standard conditions for operation in service
7.1 General
7.2 Ambient air temperature range
7.3 Altitude
7.4 Atmospheric conditions
7.5 Conditions of installation
7.6 Pollution degree
8 Requirements for construction and operation
8.1 Mechanical design
8.1.1 General
48 8.1.2 Mechanism
49 8.1.3 Clearances and creepage distances and solid insulation
50 Table 4 – Minimum clearances and creepage distances
52 8.1.4 Screws, current-carrying parts and connections
8.1.5 Terminals for external conductors
53 Table 5 – Connectable cross-sections of copper conductors for screw-type terminals
55 8.1.6 Non-interchangeability
8.1.7 Mechanical mounting of plug-in type circuit-breakers
8.2 Protection against electric shock
56 8.3 Dielectric properties and isolating capability
8.3.1 General
8.3.2 Dielectric strength at power frequency
8.3.3 Isolating capability
8.3.4 Dielectric strength at rated impulse withstand voltage (Uimp)
8.4 Temperature-rise
8.4.1 Temperature-rise limits
57 8.4.2 Ambient air temperature
8.5 Uninterrupted duty
8.6 Automatic operation
8.6.1 Standard time-current zone
Table 6 – Temperature-rise values
58 8.6.2 Conventional quantities
8.6.3 Tripping characteristic
Table 7 – Time-current operating characteristics
59 8.7 Mechanical and electrical endurance
8.8 Performance at short-circuit currents
8.9 Resistance to mechanical shock and impact
60 8.10 Resistance to heat
8.11 Resistance to abnormal heat and to fire
8.12 Resistance to rusting
8.13 Power loss
8.14 Electromagnetic immunity
8.15 Electromagnetic emission
Table 8 – Maximum power loss per pole
61 9 Tests
9.1 Type tests and test sequences
9.2 Test conditions
Table 9 – List of type tests
62 9.3 Test of indelibility of marking
Table 10 – Cross-sectional areas (S) of test copper conductors corresponding to the rated currents
63 9.4 Test of reliability of screws, current-carrying parts and connections
64 9.5 Tests of reliability of screw-type terminals for external copper conductors
Table 11 – Screw thread diameters and applied torques
65 Table 12 – Pulling forces
66 9.6 Test of protection against electric shock
9.7 Test of dielectric properties
9.7.1 Resistance to humidity
67 9.7.2 Insulation resistance of the main circuit
68 9.7.3 Dielectric strength of the main circuit
9.7.4 Insulation resistance and dielectric strength of auxiliary circuits
69 9.7.5 Verification of impulse withstand voltages (across clearances and across solid insulation) and of leakage current across open contacts
Table 13 – Test voltage of auxiliary circuits
71 Table 14 – Test voltage for verification of impulse withstand voltage
Table 15 – Test voltage for verifying the suitability for isolation, referred to the rated impulse withstand voltage of the circuit breakersand the altitude where the test is carried out
72 9.8 Test of temperature-rise and measurement of power loss
9.8.1 Ambient air temperature
9.8.2 Test procedure
9.8.3 Measurement of the temperature of parts
9.8.4 Temperature-rise of a part
9.8.5 Measurement of power loss
73 9.9 28-day test
9.10 Test of tripping characteristic
9.10.1 General
9.10.2 Test of time-current characteristic
9.10.3 Test of instantaneous tripping, of correct opening of the contacts and of the trip-free function
75 9.10.4 Test of effect of single-pole loading on the tripping characteristic of multipole circuit-breakers
9.10.5 Test of effect of ambient temperature on the tripping characteristic
9.11 Verification of mechanical and electrical endurance
9.11.1 General test conditions
76 9.11.2 Test procedure
9.11.3 Condition of the circuit-breaker after test
9.12 Short-circuit tests
9.12.1 General
77 9.12.2 Values of test quantities
9.12.3 Tolerances on test quantities
Table 16 – Applicability of short-circuit tests
78 9.12.4 Test circuit for short-circuit performance
79 9.12.5 Power factor of the test circuit
9.12.6 Measurement and verification of I2t and of the peak current (Ip)
9.12.7 Calibration of the test circuit
Table 17 – Power factor ranges of the test circuit
80 9.12.8 Interpretation of records
9.12.9 Condition of the circuit-breaker for test
81 9.12.10 Behaviour of the circuit-breaker during short-circuit tests
82 9.12.11 Test procedure
84 Table 18 – Ratio k between service short-circuit capacity (Ics) and rated short-circuit capacity (Icn)
Table 19 – Test procedure for Ics in the case of single- and two-pole circuit-breakers
85 Table 20 – Test procedure for Ics in the case of three- and four-pole circuit-breakers
Table 21 – Test procedure for Ics in the case of three-phase tests for single-pole circuit-breakers of rated voltage 230/400 V
86 Table 22 – The test procedure for Icn
Table 23 – Test procedure for Icn in the case of three-phase tests for single-pole circuit-breakers of rated voltage 230/400 V
87 9.12.12 Verification of the circuit breaker after short circuit tests.:
9.13 Mechanical stresses
9.13.1 Mechanical shock
88 9.13.2 Resistance to mechanical stresses and impact
91 9.14 Test of resistance to heat
92 9.15 Resistance to abnormal heat and to fire
93 9.16 Test of resistance to rusting
94 Figures
Figure 1 – Thread forming tapping screw (3.3.22)
Figure 2 – Thread cutting tapping screw (3.3.23)
Figure 3 – Typical diagram for all short circuit tests except for 9.12.11.2.2)
95 Figure 4 – Typical diagram for short circuit tests according to 9.12.11.2.2)
Figure 5 – Detail of impedance Z and Z1
97 Figure 6 – Example of short-circuit making or breaking test record in the case of a single-pole device on single phase AC
98 Figure 7 – Mechanical shock test apparatus (9.13.1)
99 Figure 8 – Standard test finger (9.6)
100 Figure 9 – Mechanical impact test apparatus (9.13.2)
101 Figure 10 – Striking element for pendulum for mechanical impact test apparatus (9.13.2)
102 Figure 11 – Mounting support for mechanical impact test (9.13.2)
103 Figure 12 – Example of mounting of a flush-type circuit-breaker for mechanical impact test (9.13.2)
104 Figure 13 – Example of mounting of a panel board type circuit-breaker for mechanical impact test (9.13.2)
105 Figure 14 – Application of force for mechanical test ona rail-mounted circuit-breaker (9.13.2.4)
Figure 15 – Ball-pressure test apparatus
106 Figure 16 – Example of application of force for mechanical test on two-pole plug-in circuit-breaker, the holding in position of which depends solely on the plug-in connections (9.13.2.5)
Figure 17 – Diagrammatic representation (9.15)
107 Annexes
Annex A (informative) Determination of short-circuit power factor
108 Annex B (normative) Determination of clearances and creepage distances
112 Figure B.1 – Examples of methods of measuring creepage distances and clearances
113 Annex C (normative) Test sequences and number of samples
114 Table C.1 – Test sequences
115 Table C.2 – Number of samples for full test procedure
117 Table C.3 – Reduction of samples for series ofcircuit-breakers having different numbers of poles
118 Table C.4 – Test sequences for a series of circuit-breakers being of different instantaneous tripping classifications
119 Annex D (informative) Co-ordination under short-circuit conditions between a circuit-breaker and another short-circuit protective device (SCPD) associated in the same circuit
124 Figure D.1 – Overcurrent co-ordination between a circuit-breaker and a fuse or back-up protection by a fuse – Operating characteristics
Figure D.2 – Total selectivity between two circuit-breakers
125 Figure D.3 – Back-up protection by a circuit-breaker – Operating characteristics
126 Annex E (normative) Special requirements for auxiliary circuits for safety extra-low voltage
127 Annex F (informative) Examples of terminals
Figure F.1 – Examples of pillar terminals
128 Figure F.2 – Examples of screw terminals and stud terminals
129 Figure F.3 – Examples of saddle terminals
Figure F.4 – Examples of lug terminals
130 Annex G (informative) Correspondence between ISO and AWG copper conductors
131 Annex H (normative) Arrangement for short-circuit test
132 Figure H.1 – Example of test arrangement
Figure H.2 – Grid circuit
133 Figure H.3 – Grid circuit
134 Annex I (normative) Routine tests
135 Annex J (normative) Particular requirements for circuit-breakers with screwless-type terminals for external copper conductors
138 Table J.1 – Conductors and their theoretical diameters
Table J.2 – Cross-sections of copper conductors connectable to screwless-type terminals
140 Table J.3 – Pull forces
141 Figure J.1 – Example of test set-up
142 Figure J.2 – Examples of screwless-type terminals
144 Annex K (normative) Particular requirements for circuit-breakers with flat quick-connect terminations
145 Table K.1 – Informative table on colour code of female connectors in relationship with the cross section of the conductor
146 Table K.2 – Overload test forces
147 Figure K.1 – Example of position of the thermocouple for measurement of the temperature-rise
Table K.3 – Dimensions of tabs
148 Figure K.2 – Dimensions of male tabs
149 Figure K.3 – Dimensions of round dimple detents (see Figure K.2)
Figure K.4 – Dimensions of rectangular dimple detents (see Figure K.2)
Figure K.5 – Dimensions of hole detents
150 Figure K.6 – Dimensions of female connectors
Table K.4 – Dimensions of female connectors
151 Annex L (normative) Specific requirements for circuit-breakers with screw-type terminals for external untreated aluminium conductors and with aluminium screw-type terminals for use with copper or with aluminium conductors
152 Bibliography
BS EN 60898-1:2019+A11:2024
$215.11