IEEE C37.21-1985
Standard for Control Switchboards

Standard No.

IEEE C37.21-1985

Release Date

1985

Published By

IEEE - The Institute of Electrical and Electronics Engineers@ Inc.

Status

Be replaced 2017-05

Replace By

IEEE C37.21-2005

Latest

IEEE C37.21-2017

IEEE C37.21-1985 history

• 2017 IEEE C37.21-2017 Control Switchboards
• 2005 IEEE C37.21-2005 Control Switchboards
• 1985 IEEE C37.21-1985 Standard for Control Switchboards