BS 638-7:1984

Foreword
Committees responsible
Specification
Section one. General
1. Scope
2. Definitions
Section two. Installation
3. General requirements
3.1 General
3.2 Earthing
3.3 No-load voltage
4. Electric circuits
4.1 Welding return
4.2 Earthing of the workpiece
4.3 Protective measures with respect to extraneous
     conductive parts in the welding area
4.4 Welding circuits
Section three. Use
5. General safety
5.1 Plant (power sources, equipment and accessories)
5.2 Power sources connected together
5.3 Inspection and maintenance of the welding
     installation
5.4 Disconnection of power sources
5.5 Enclosures and guards
5.6 Information for operators
5.7 Protective clothing and accessories
5.8 Isolation of electrode holders and torches
     when not in use
5.9 Voltage between electrode holders and torches
6. Earthing of the workpiece
7. Voltage
7.1 General
7.2 Several operators welding on the same workpiece
8. Welding in an environment with increased hazard
     of electric shock
Appendices
A. Information on legal requirements and publication
     regarding welding safety
B. Recommendations for the use of arc welding power
     sources, equipment and accessories
Figures
1. Diagrammatic representation of typical earthing
     points and return current connections
2. Diagram showing reason for NOT earthing the wire
     feed unit enclosure
3. No-load voltage between electrode holders
4. Diagrams showing reason for earthing the
     welding circuit at the workpiece

Additional recommendations supplement the requirements and there are also recommendations for welding in environments with increased hazard of electric shock.