FOREWORD
1 Scope and object
2 Normative references
3 Terms and definitions
4 Classification of electroheat equipment according
   to voltage bands
5 Classification of electroheat equipment according
   to frequency bands
6 General requirements
   6.7 Resistivity
   6.8 Auxiliary equipment
   6.9 Bare heating conductors
   6.10 Leakage current
   6.11 Vapours, precipitates and sediments from the charge
   6.12 Salt-bath furnaces and melting furnaces
   6.13 Heating-up solidified contents of the bath
   6.14 Vacuum furnaces
7 Isolation and switching
8 Connection to the supply network and internal connections
9 Protection against electric shock
   9.5 Protection against direct contact
   9.6 Protection against direct and indirect contact
10 Protection against overcurrent
11 Equipotential bonding
12 Control circuits and control functions
13 Protection against thermal influences
   13.6 Surface temperature of resistance heating equipment
   13.7 Special measures
   13.8 Temperature safety devices
   13.9 Nitrite and nitrate bath furnaces
14 Risk of fire and danger of explosion
   14.1 Nitrite and nitrate bath furnaces
15 Marking, labelling and technical documentation
   15.2 Labelling
   15.3 Technical documentation
16 Information on inspection and commissioning and
   instructions for utilization and maintenance of electroheat
   installations
   16.2 Information on inspection and commissioning
   16.3 Instructions for utilization to be given in the
        technical documentation