93/210506 DC : DRAFT AUG 1993

INTRODUCTION
1 SCOPE
2 DEFINITIONS
3 DOCUMENTATION
    3.1 Circuit documentation
    3.2 Documents for prototype tested assemblies
    3.3 Documentation of the software of the safety device
    3.4 Documentation of the applications software
4 ELECTRICAL APPARATUS
    4.1 General requirements
    4.2 Protection against external influences
    4.3 Electrical operating conditions
    4.4 Creepage distances and clearances
    4.5 Motors
    4.6 Transformers
    4.7 Switching devices
    4.8 Control devices and actuators
    4.9 Heating systems
5 PROTECTIVE MEASURES
    5.1 Protection against direct contact
    5.2 Protection against indirect contact
6 ISOLATING DEVICES
7 EMERGENCY SWITCHES AND MASTER SWITCHES
    7.1 Furnaces in steam boilers
    7.2 Furnaces in heating installations
    7.3 Design requirements
    7.4 Application as isolating switch
8 AUXILIARY CIRCUITS
    8.1 Supply to auxiliary circuits
    8.2 Voltage for auxiliary circuits
    8.3 Earthing of auxiliary circuits
    8.4 Measures to prevent danger from short circuits to
          exposed conductive parts or earth
    8.5 Functional equipotential bonding
    8.6 Influence of capacitances and leakage resistances
    8.7 Short-circuit protection of auxiliary circuits
9 ADDITIONAL REQUIREMENTS FOR THE DESIGN OF SAFETY DEVICES
    9.1 Design of safety devices
          9.1.1 Consideration of times
          9.1.2 Hard-wired section of safety devices
          9.1.3 Stored program section of safety devices
          9.1.4 Exclusion of faults
    9.2 Additional requirements of open-circuit arrangements
    9.3 Evidence that the requirements of components of
          safety devices are fulfilled
    9.4 Maintenance of the effectiveness of safety devices
    9.5 Quality assurance measures
    9.6 Hardware
    9.7 Software
10 CABLES AND CORDS
11 MAINS AND EQUIPMENT CONNECTIONS
    11.1 Types of connection
    11.2 Connecting points and ends of conductors
12 INDEX
13 LIST OF FIGURES, TABLES AND APPENDIXES

Possible new British Standard Applicable to electrical equipment for furnaces operated with solid, liquid or gaseous fuels, used on water-heating systems, steam boiler installations, warm air heaters, hot-gas heaters, heat exchanger systems and combustion chambers of stationary turbines.