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Manual Synchronizing Deserves Better Than “Four Boxes and a Wiring Maze” On a manual synchronizing panel, the operator has to do two things at the same time: See  both sides – voltage, frequency and phase angle Decide  whether it is safe to close the breaker In many existing cabinets this means a whole chain of devices: Synchroscope (synchronizing meter) Synchro-check relay Phase-angle transducer (“angle shifter”) Isolation transformer(s) The result is long wiring runs, many