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Hollow pressurized and unpressurized ceramic and glass insulators for use in electrical equipment with rated voltages greater than 1000 V Ingestion-build-68772 Calculation of mass and tolerances1 Scope and object 1. 1 General This standard is applicable to ceramic and glass hollow insulators intended for general use in electrical equipment; ceramic hollow insulators intended for use with a permanent gas pressure in switchgear and controlgear. These insulators are intended for indoor and outdoor use in electrical equipment, operating on alternating current with a rated voltage greater than 1 000 V and a frequency not greater than 100 Hz or