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IEC/TR 60575 Ed. 1.0 b:1977
Thermal-mechanical performance test and mechanical performance test on string insulator units
Applies to string insulator units of the cap and pin type as well as of the long rod type with insulating parts of ceramic material or glass intended for a.c. and d.c. overhead lines with a nominal voltage greater than 1000 V and also to insulators of similar design when used in substations. Note -This publication should be read in conjunction with IEC 60383.
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International Electrotechnical Commission [iec]
International Electrotechnical Commission [iec]