IS 9921 Pt.1-1981
Specification for alternating current isolators (isolators) and earthing switches for voltages above 1000 V Part I General principles and definitions

Standard No.

IS 9921 Pt.1-1981

Release Date

1981

Published By

IN-BIS

Latest

IS 9921 Pt.1-1981

Scope

This specification applies to alternating current disconnectors and earthing switches, designed for indoor and outdoor installation, for voltages above 1 000 V and for the service frequency of 50 Hz.

IS 9921 Pt.1-1981 history

• 1981 IS 9921 Pt.1-1981 Specification for alternating current isolators (isolators) and earthing switches for voltages above 1000 V Part I General principles and definitions