BS 5924:1989

National foreword
Brief history
Technical text
Contents
Foreword
1 Scope and object
1.1 Scope
1.2 Object
2 References
3 Definitions
3.1 Equipment for resistance welding and allied
         processes
3.2 Processes allied to resistance welding
3.3 Input circuit (primary circuit)
3.4 Welding circuit (secondary circuit)
3.5 Portable hand-held resistance welding equipment
         with incorporated transformer
4 Environmental conditions
5 Requirements and tests
5.1 Protection against electric shock
5.1.1 Clearances and creepage distances
5.1.2 Dielectric strength
5.1.3 Protection against direct contact (normal
         service)
5.1.3.1 Liquid cooling
5.1.4 Protection against indirect contact (fault
         condition)
5.1.4.1 Direct connection to the protective conductor
5.1.4.2 Connection to the protective conductor by an
         impedance
5.1.4.3 Current operated earth leakage circuit breaker
5.1.4.4 Voltage operated earth leakage circuit breaker
5.1.4.5 Protective metal screen
5.1.4.6 Protective measures
5.1.4.7 D.c. resistance welding equipment
5.2 Additional user's requirements
5.3 Thermal rating of rectifier sets
5.4 Connection to the main supply
5.4.1 Supply voltage
5.5 Cycle start
5.6 Conductors of the welding circuit
5.7 Operation test
5.8 Instructions for use
Figures
1 Protective conductor directly at the welding
         circuit
2 Protective conductor directly at welding
         circuits
3 Protective conductor at welding circuits by
         impedances
4 Protective conductor at welding circuits by
         saturable auto-inductance
5 Protective conductor at welding circuits by
         saturable auto-inductances with triggering of
         the main breaker
6 Current operated earth leakage circuit breaker
7 Voltage operated earth leakage circuit breaker
8 Voltage operated earth leakage circuit breaker
         for protective metal screen
Annexes
ZA (normative) Additional definitions
ZB (informative) National deviations
National appendix W
National appendix X
Cooperating organizations