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Scheme B

Scheme B This scheme is used to prevent the opening of the non-load break disconnect switch while the breaker is closed.

Initial Condition: The load is fed from Line 1 through the non-load break disconnect switch #1 and breaker #1. Switch #1 is locked closed with no interlock key present. Breaker #1 is closed with its respective interlock key "A" captive.

Opening the non-load break disconnect switch: Open and lock breaker #1 thereby releasing the "A" key. Use the "A" key to unlock and open switch #1. Reverse to restore the initial condition.

Additional Schemes:
A / A1 / B / B1 / C / D / E / F / G / H / H1 / H2 / K / L / M / N / O / P / R / U.P.S. System / Capacitor Bank Access Scheme

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