BS 4177:1992

Committees responsible
Foreword
1 Scope
2 Definitions
3 General
4 Type testing
5 Ratings
6 Classification
7 Marking
8 Dimensions
9 Accessibility of live parts
10 Provision for earthing
11 Terminals
12 Construction
13 Switch mechanisms
14 Resistance to ageing and humidity
15 Insulation resistance and electric strength
16 Temperature rise
17 Making and breaking capacity
18 Normal operation
19 Mechanical strength
20 Resistance to heat
21 Screws, connections and current-carrying parts
22 Creepage distances, clearances and distances through insulating
   material
23 Resistance of insulating material to abnormal heat, to fire and
   to tracking
24 Resistance to excessive residual stresses and to rusting of
   ferrous parts
Appendix A - Guideline regarding the EMC Directive 89/336/EEC as
             applicable to cooker control units
Appendix B - Method of test for durability
Appendix C - Method of testing the accessibility of live parts
Appendix D - Method of determining the provision for earthing for
             accessible metal parts connected to the earthing
             terminal(s)
Appendix E - Method of determining damage to conductors by the
             terminal
Appendix F - Method of test for determining conductor mobility
Appendix G - Method of test for determining conductor or wire
             slippage
Appendix H - Method of test for terminal fixings
Appendix J - Method of testing knobs
Appendix K - Method of test for cord anchorages
Appendix L - Method of determining arcing
Appendix M - Method of determining resistance to ageing
Appendix N - Humidity treatment
Appendix P - Insulation resistance and electric strength
Appendix Q - Temperature rise test
Appendix R - Making and breaking capacity
Appendix S - Determination of normal operation of switch
             controlling electric supply
Appendix T - Impact test
Appendix U - Determination of resistance to heat
Appendix V - Method of test for screws
Appendix W - Glow wire test
Appendix Y - Residual stresses and rusting
Publication(s) referred to

Safety requirements and tests for the control of the electricity supply to cookers and similar household electrical appliances.

This British Standard specifies requirements and tests for those cooker control units primarily intended for the control of the electric supply to cookers consisting of a main switch with certain auxiliaries and rated at a voltage not exceeding 250 V at 50 Hz. Such units comprise the following: a main switch, for controlling the electric supply to the cooker, having a rated current not exceeding 45 A; a socket-outlet and associated switch having a rated current not exceeding 15 A. Cooker control units complying with this standard are suitable for use under the following conditions: in air temperatures from – 5 °C to +40 °C with an average value over a period of 24 h not exceeding +25 °C; where the altitude of the site of installation does not exceed 2 000 m; in an atmosphere not subject to pollution by smoke, chemical fumes, rain, spray, prolonged periods of high humidity or other conditions. NOTE 1 Direct radiation from the sun should be avoided and instructions to this effect are recommended. In locations where special conditions prevail, e.g. in ships and vehicles, and in hazardous locations, for instance where explosions are liable to occur, special constructions may be required. Appendix A gives a guideline regarding the EMC Directive 89/336/EEC. NOTE 2 The titles of the publications referred to in this standard are listed on the inside back cover.