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BS 7288:2016+A1:2022

BS 7288:2016+A1:2022

$215.11

Specification for residual current devices with or without overcurrent protection for socket‑outlets for household and similar uses

Published By Publication Date Number of Pages
BSI 2022 122
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PDF Catalog

PDF Pages PDF Title
7 Foreword
9 0 Introduction
1 Scope
10 2 Normative references
11 3 Terms, definitions and symbols
17 4 Classification
18 4.1 Classification according to behaviour resulting from failure of the line voltage
4.2 Classification according to the design
4.3 Classification according to behaviour in presence of d.c. components
4.4 Classification according to the provision for earthing
4.5 Classification according to the design of the cover plate
4.6 Classification according to the method of mounting
19 4.7 Classification according to the environmental conditions
4.8 Classification according to the type of terminals
4.9 Classification according to overcurrent protection
4.10 Type of SRCD
4.11 Number of poles
20 4.12 Type of switching
5 Characteristics of SRCDs
5.1 Summary of characteristics
5.2 Characteristics common to all socket‑outlet residual current devices
21 5.3 Characteristics specific to SRCDs with overcurrent protection (see 4.9)
22 5.4 Preferred or standard values
23 Table 1 — Standard values of maximum break time of SRCDs for a.c. residual current
Table 2 — Standard values of maximum break time of SRCDs for pulsating d.c. residual current
5.5 Text deleted
6 Marking and other product information
6.1 General
Table 4 — Position of marking
26 6.2 Additional marking for screwless terminals
6.3 Void
7 Standard conditions for operation in service and for installation
Table 5 — Values of influencing quantities
27 8 Requirements for construction and operation
8.1 General
8.2 Information and marking
28 8.3 Mechanical and electrical design
29 Table 6 — Minimum clearances and creepage distances
32 8.4 Operating characteristics
33 Table 7 — Tripping current limits
8.5 Void
8.6 Test device
8.7 Temperature rise
34 Table 8 — Temperature‑rise values
8.8 Resistance to humidity
8.9 Dielectric properties
8.10 EMC compliance and unwanted tripping
8.11 Behaviour of SRCDs in case of overcurrent conditions
35 8.12 Resistance of the insulation against impulse voltages
8.13 Mechanical and electrical endurance
8.14 Resistance to mechanical shock
8.15 Reliability
8.16 Protection against electric shock and degree of protection IP of the SRCD
36 8.17 Resistance to heat
8.18 Resistance to abnormal heat and to fire
8.19 Behaviour of SRCDs within ambient temperature range
37 8.20 Resistance to temporary overvoltages
Table 11 — Withstand values and duration of temporary overvoltages
9 Tests
9.1 General
Table 12 — Test copper conductors corresponding to the rated currents
38 Table 13 — Type testing schedule
9.2 Marking and test of indelibility of marking
9.3 Verification of the trip‑free mechanism
39 9.4 Test for the verification of electronic circuits
40 Table 14 — Maximum permissible temperatures under abnormal conditions
41 9.5 Requirements for capacitors and specific resistors and inductors
42 9.6 Test of reliability of screws, current‑carrying parts and connections
Table 15 — Screw thread diameters and applied torques
9.7 Screwed and screwless terminals
43 Table 16 — Relationship between rated current and connectable nominal cross‑sectional areas of copper conductors
44 Table 17 — Values for flexing under mechanical load test for copper conductors
45 Table 18 — Values for pull test for screw‑type terminals
Table 19 — Composition of conductors
46 Table 20 — Tightening torques for the verification of the mechanical strength of screw‑type terminals
48 Table 21 — Relationship between rated current and connectable cross‑sectional areas of copper conductors for screwless terminals
49 Table 22 — Value for pull test for screwless‑type terminals
50 Table 23 — Values for flexing under mechanical load test for copper conductors
Table 24 — Test current for the verification of electrical and thermal stresses in normal use for screwless terminals
52 Table 25 — Nominal cross‑sectional areas of rigid copper conductors for deflection test of screwless terminals
Table 26 — Deflection test forces
53 9.8 Verification of the operating characteristics of type AC and type A SRCDs
56 Table 27 — Tripping current ranges for SRCDs in case of pulsating d.c. current
57 9.9 Void
9.10 Verification of the test device
9.11 Verification of the limit of temperature rise
59 Table 27A — Loading of SRCDs for temperature rise test
60 9.12 Resistance to humidity
61 9.13 Test of dielectric properties
62 9.14 EMC compliance and unwanted tripping
Table 28 — Tests to be applied for EMC
63 9.15 Verification of the behaviour of the SRCD under overcurrent conditions
Table 29 — Tests to verify the behaviour of SRCDs under overcurrent conditions
66 Table 30 — Power factor ranges of the test circuit
70 9.16 Verification of clearances of the SRCD with the impulse withstand voltage test
71 Table 31 — Test voltage for verification of impulse withstand voltage between poles
Table 32 — Test voltage for verification of impulse withstand voltage with the metal support
9.17 Mechanical and electrical endurance
72 Table 33 — Cross‑sectional area for test conductors
73 9.18 Resistance to mechanical shock
74 Table 34 — Height of fall for impact tests
76 Table 35 — Torque test values for glands
77 9.19 Reliability
79 9.20 Protection against electric shock and degree of protection IP of the SRCD
80 9.21 Resistance to heat
81 9.22 Resistance to abnormal heat and to fire – Glow‑wire test
82 9.23 Text deleted
9.24 Verification of ageing of electronic components
9.25 Verification of the behaviour of the SRCD under temporary overvoltage conditions
83 9.26 Tests for reverse polarity (see 8.3.1)
9.27 Resistance to excessive residual stress test
84 Figure 1 — Standard test finger
85 Figure 2 — General test circuit
86 Figure 3 — Minimum creepage distances and clearances as a function of peak value of voltage
87 Figure 4 — Minimum creepage distances and clearances as a function of peak value of operating voltage
88 Figure 5 — Pillar terminals
89 Figure 6 — Screw terminals and stud terminals
90 Figure 7 — Saddle terminals
91 Figure 8 — Saddle terminals
92 Figure 9 — Arrangement for checking damage to conductors
93 Figure 10 — Information for deflection test
94 Figure 11 — Example of a test circuit with current and voltage derived from separate sources
Figure 12 — Test cycle for low temperature test
95 Figure 13 — Void
Figure 14 — Test circuit for the verification of the correct operation of SRCDs, in the case of residual pulsating direct currents
96 Figure 15 — Test circuit for the verification of the correct operation of SRCDs, in the case of residual pulsating direct currents superimposed by a smooth direct current
97 Figure 16 — Damped oscillator current wave 0,5 μs/100 kHz
Figure 17 — Example of test circuit for the verification of resistance against unwanted tripping due to surge currents to earth resulting from impulse voltages for SRCDs
98 Figure 18 — Test circuit for the verification of the rated making and breaking capacity and of the coordination
99 Figure 19 — Test apparatus for the verification of the minimum I2t and Ip values to be withstood by the SRCD [9.15.2.1a)]
100 Figure 20 — Gauge for checking non‑accessibility of live parts
101 Figure 21 — Impact‑test apparatus
102 Figure 22 — Details of the striking element
103 Figure 23 — Mounting support for specimens
Figure 24 — Mounting block for flush‑type SRCDs
104 Figure 25 — Reliability test cycle
105 Figure 26 — Ball‑pressure test apparatus
106 Figure 27 — Sketches and table showing the application of the blows
107 Figure 28 — Diagrammatic representation of 9.22
Figure 29 — Test circuit for the verification of TOV withstand (9.25) A)
108 Annex A (normative)  Test sequence and number of samples to be submitted for verification of conformity
Table A.1 — Type testing schedule
110 Table A.2 — Number of samples for full test procedure
111 Table A.3 — Number of samples for simplified test procedure
112 Annex B (normative)  Determination of clearances and creepage distances
113 Figures B.1 to B.10 — Illustrations of the application of creepage distances
114 Annex C (informative)  Text deleted
Annex D (normative)  Routine tests
115 Annex E (informative)  Methods of determination of short‑circuit power factor
116 Annex F (informative)  Differences between BS 7822:2016 and IEC 62640:2011 (with the common modifications)
Table F.1 — Differences between BS 7288:2016 and IEC 62640:2011/HD 62640:2015
119 Bibliography

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BS 7288:2016+A1:2022
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