This scheme is used to prevent access to the disconnect switch enclosures while the breaker is closed.
Initial Condition: Breaker #1 is closed with key "A" captive in its respective key interlock. Switch #1 and #2 enclosures are locked closed with no keys present in their respective key interlocks. The 3-key transfer interlock has two "B" keys captive in its secondary cylinder positions.
Gaining access to the disconnect switch enclosures: Open and lock breaker #1 thereby releasing the "A" key. Deposit and turn the "A" key in the 3-key transfer interlock to obtain the "B" keys. Use the "B" keys to unlock the access enclosures. Reverse to restore the initial condition.
Home Products Schemes Info Forms Contact Site Map EMail
© 2002 Superior Interlock Corporation [All rights reserved]
Phone: (718) 821-8949