This standard is Safety in electroheat installations - Part 21: Particular requirements for resistance heating equipment - Heating and melting glass equipment; Corrigendum 1.
IEC 60519-21/COR1:1999 history
2008IEC 60519-21:2008 Safety in electroheat installations - Part 21: Particular requirements for resistance heating equipment - Heating and melting glass equipment
1970IEC 60519-21:1998/COR1:1999 Corrigendum 1 - Safety in electroheat installations - Part 21: Particular requirements for resistance heating equipment - Heating and melting glass equipment
1998IEC 60519-21:1998 Safety in electroheat installations - Part 21: Particular requirements for resistance heating equipment - Heating and melting glass equipment