This scheme is used to prevent the operation of switch #1 with breaker #1,2,3,4 closed.
Initial conditions: Switch #1 is locked open or closed with no key present in its respective key interlock; breakers #1,2,3,4 are closed with keys "B,C,D,E" captive in their respective key interlocks. The key transfer block has an "A" key captive while its remaining positions have no keys present.
Switching scenario: Locking open all breakers to enable operation of Switch #1: Lock open breakers #1,2,3,4 thereby releasing the "B,C,D and E" keys. Deposit and turn the "B,C,D and E" keys in the transfer block to release the "A" key. Use the "A" key to release switch #1 for operation and place it in the desired position. Reverse to restore the initial condition.
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