IEC 61958 pdf download High-voltage prefabricated switchgear and controlgear assemblies – Voltage presence indicating systems This International Standard is applicable to voltage presence indicating systems (VPIS) incor-porated in a.c. switchgear and controlgear covered by lEC 60298 or lEC 60466. Voltage presence indicating systems are devices used to provide information to operatorsabout the voltage condition of the main circuit of the...