What must be done to the circuit after phasing out and before connecting two circuits?

Before connecting two circuits, it is crucial that regulators are set to neutral and locked out to ensure the safety and functionality of the system. Setting regulators to neutral prevents any unwanted electrical feedback or load imbalances during the connection process. Locking out the regulators is a safety measure that ensures they cannot be accidentally re-energized or manipulated while the circuits are being connected, protecting both the equipment and the personnel involved in the operation.

Proper grounding, testing of components, and opening circuit breakers are all important safety procedures in their own right, but they serve different purposes. Grounding is essential for protecting against electrical faults, while testing components ensures they are functioning properly. Opening circuit breakers is often necessary for isolation purposes, but when specifically addressing the procedure of connecting circuits after phasing, ensuring regulators are set to neutral and locked out is the critical step to avoid dangerous situations.