IEC 61958 pdf download.High-voltage prefabricated switchgear and controlgear assemblies – Voltage presence indicating systems 1 General 1 .1 Scope This International Standard is applicable to voltage presence indicating systems (VPIS) incor- porated in a.c. switchgear and controlgear covered by IEC 60298 or IEC 60466. Voltage presence indicating systems are devices used to provide information to operators about the voltage condition...