This clause of part 2 applies except as follows:
Addition:
Insert the following after the first paragraph:
These requirements apply to the protection of persons against contact with current from electrically heated equipment for melting glass.
NOTE - Extraction of liquid glass or a similar material at the extraction point is part of the production process and does not constitute part of the operation of the electrical heating equipment.
The standard covers the safety aspects of electrical parts also in the case when electrical heating is combined with other means of heating, for example liquid fuel heating.
IEC 60519-21:1998 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