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Dead-Bus vs Synchronism Check Is Not a “Preference” – It’s a Different Close Logic In manual synchronizing / automatic synchro-check systems, “dead-bus check” is not just another panel habit. It changes the   criterion for closing the breaker : Synchronism check (synchro-check)  – close is permitted only when voltage, frequency and phase angle are within defined limits. Dead-bus / dead-line check  – close is permitted only when the bus/line is confirmed de-energized (or very