BS 5042:1987

Foreword
Committees responsible
Specification
1 Scope
2 Definitions
3 General requirements
4 Requirements for type testing
5 Ratings
6 Classification
7 Marking
8 Dimensions and gauges
9 Protection against electric shock
10 Terminals
11 Provision for earthing
12 Construction
13 Switched lampholders
14 Moisture resistance, insulation resistance and
    electric strength
15 Screws, current-carrying parts and connections
16 Creepage distances and clearances
17 Resistance to heat in service
18 Mechanical strength
19 Heating of current-carrying parts
20 Resistance to heat, fire and tracking
21 Resistance to excessive residual stresses and to
    rusting
Appendices
A Guide to the use of lampholders marked T1 or T2
B Specification for petroleum spirit
Tables
1 International designations
2 Torque for terminal screws
3 Torque for screwed parts
4 Creepage distances and clearances
5 T-rating, test temperature and test lamp data
6 Maximum permitted rating of lamp
Figures
1 Testing device for protection against shock
2 Types of bayonet lampholder
3 Dimensions for protective shield for B22d
    lampholders
4 Dimensions for shade support devices
5 Nipple thread for lampholders. Basic profile and
    design profiles for the nut and for the screw
6 Gauges for nipple thread
7 Typical apparatus for heating test
8 Loading device
9 Ball-pressure apparatus
10 Tracking test apparatus

Requirements and tests for B15 and B22 lampholders and contains marking, construction and testing requirements and a guide to improve the control of operating temperatures.