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ASCO Three-source system

ASCO Three-Source Systems are similar to ASCO Two-Source Systems except that a second alternate power source is added to back up the first if that power source fails.

Control logic for selecting between the alternative power sources.Normal, emergency, and/or load circuit breakersProtective relaying (as required)Optional instrument meters for normal, emergency, or load for local monitoring.

ASCO Three-source system
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