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Scheme A1

Scheme A1

This scheme is used to prevent two Mains with a Generator and a Main and two Generators from being tied together through their own associated switch or breaker. This scheme prevents two switches or breakers from being closed simultaneously

Initial Condition: The load is feed from Utility 2 through Breaker #2, which is normally closed with its respective interlock key "A" captive. Breaker #1 and the Generator Breaker are locked open with no interlock keys present.

Switching the load to an alternate source: Open and lock Breaker #2 thereby removing the "A" key. Use the "A" key to unlock and close either the Generator Breaker or Breaker #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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