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BS 5733:2010+A1:2014

BS 5733:2010+A1:2014

$215.11

General requirements for electrical accessories. Specification

Published By Publication Date Number of Pages
BSI 2014 84
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1.1

This British Standard specifies requirements and tests to check the safety in normal use of electrical accessories which are not covered by other specific British Standards.

Such accessories are intended for use in household, commercial and light industrial premises where:

  • the nominal supply voltage does not exceed 250 V a.c. single-phase, 50 Hz to 60 Hz or 250 V d.c.;

  • the rated current of the accessory does not exceed 63 A.

Unless otherwise stated by the manufacturer, accessories conforming to this standard are intended for connection by cables or flexible cords conforming to BS 6004, BS 6007, BS 6500 or BS 7211.

1.2

This standard also covers:

  • “plug-in” and other accessories in which electrical accessory components such as plug-pins, socket-contacts, switches, terminals, etc. are incorporated (see 5.1);

  • maintenance free accessories (see 3.31).

1.3

Accessories conforming to this standard are suitable for use under the following conditions of service:

  • an ambient temperature in the range -5 °C to +40 °C, the average value over 24 h not exceeding 25 °C;

    NOTE 1 Under normal conditions of use, the available cooling air is subject to natural atmospheric variations of temperature and hence the peak temperature occurs only occasionally during the hot season, and on those days when it does occur, it does not persist for lengthy periods.

  • a situation not subject to direct radiation from the sun or other source of heat likely to raise temperatures above the limits specified above;

  • an altitude not exceeding 2 000 m above sea-level;

  • an atmosphere not subject to excessive pollution by smoke, chemical fumes, or other abnormal conditions.

NOTE 2 Accessories conforming to this standard may be suitable for use in other conditions, subject to agreement between manufacturer and user. Information given in a manufacturer’s catalogue may take the place of such an agreement.

1.4

Requirements for electromagnetic compatibility are not given, as accessories do not in themselves produce extraneous emissions, nor is their functioning affected by external emissions. Therefore no emission or immunity tests are necessary.

It should be noted that accessories containing active electronic components, other than luminous indicating devices, may be susceptible to, or emit, electromagnetic interference.

PDF Catalog

PDF Pages PDF Title
5 Foreword
7 1 Scope
8 2 Normative references
9 3 Terms and definitions
14 Figure 1 Examples of pillar terminals
15 Figure 2 Examples of screw terminals and stud terminals
16 Figure 3 Examples of saddle terminals
Figure 4 Examples of lug terminals
17 4 Classification
Figure 5 Examples of a mantle terminal
Figure 6 Thread forming tapping screw
Figure 7 Thread cutting tapping screw
18 5 General requirements
6 Type testing
19 7 Rating
8 Marking
22 9 Dimensions
10 Clearances, creepage distances and solid insulation
23 Table 1A Minimum clearances for basic insulation
25 Table 1B Minimum creepage distances for basic insulation
26 11 Accessibility of live parts
Table 1C Withstand test voltages for solid insulation types
27 Figure 8 Gauge for checking non-accessibility through shutters
29 12 Provision for earthing
Figure 9 Apparatus for testing accessory enclosure fixing screws
31 13 Construction
33 Figure 10 Solid link for test on fuseclips
35 14 Terminals and terminations
36 Table 2 Conductors to be accommodated by terminals
37 Figure 11 Arrangement for checking damage to conductors
Table 3 Torque values for test of screws and nuts
38 Table 4 Pull for terminal clamping test
43 Table 5 Current for electrical and thermal stress test
46 Figure 11A Arrangement for voltage drop test [New Figure]
47 15 Screws, current-carrying parts and connections
49 16 Provisions for cables and cords
50 Table 6 Pull and torque tests for flexible cord and cable anchorages
52 Figure 12 Apparatus for flexing test
53 17 Resistance to ageing
18 Resistance to harmful ingress of water and resistance to humidity
54 19 Insulation resistance and electric strength
55 20 Temperature rise
56 Table 6A Cross-sectional areas for copper conductors for temperature-rise test [New Table]
58 21 Mechanical strength
Table 7 Multiplying factor for the temperature rise test
60 Figure 13 General view of an example of impact test apparatus
61 Figure 14 Constructional details of striking element
62 Figure 15 Constructional details of mounting support for test samples
63 Figure 16 Arrangement for mechanical strength test for portable accessories other than plugs or adaptors
64 Figure 17 Tumbling barrel
67 Table 8 Torque for mechanical test on glands
68 22 Resistance to heat
69 Figure 18 Figure deleted
70 Figure 19 Apparatus for pressure test on portable accessories
71 23 Resistance of insulating material to abnormal heat, and to fire
72 24 Clause deleted
25 Resistance to excessive residual stresses and to rusting
73 Annex A (informative) Summary of tests on insulating parts of accessories
Figure A.1 Diagrammatic representation of the sequence of tests on insulating parts of accessories
74 Annex B (normative) Measurement of clearances and creepage distances
Table B.1 Minimum values of width “X”
78 Annex C (normative) Determination of the comparative tracking index (CTI) and proof tracking index (PTI)
79 Annex D (normative) Relation between rated impulse withstand voltage, rated voltage and overvoltage category
Annex E (normative) Pollution degree
Table D.1 Rated impulse withstand voltage for accessories energized directly from the low voltage mains
80 Annex F (normative) Impulse withstand voltage test
81 Table F.1 Test voltages for impulse withstand test
82 Bibliography

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BS 5733:2010+A1:2014
$215.11