EN 60519-21:2009

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
7 Isolation and switching
8 Connection to the supply network and internal connections
9 Protection against electric shock
10 Protection against overcurrent
11 Equipotential bonding
12 Control circuits and control functions
13 Protection against thermal influences
14 Risk of fire and danger of explosion
15 Marking, labelling and technical documentation
16 Information on inspection and commissioning and instructions
   for utilization and maintenance of electroheat installations

IEC 60519-21:2008 is applicable to indirect resistance heating equipment for the heating and melting of glass, operating in voltage bands 1 and 2. These particular requirements also apply to equipment for direct resistance heating and melting of glass by means of current introduced by electrodes passing through the charge to be heated. This new edition of IEC 60519-21 takes into account the latest editions of IEC 60519-1, of IEC 60519-2 and of IEC 60050-841.