Three-way and four-way switches should be wired to ensure that all switching occurs only in the _____ conductors.

When wiring three-way and four-way switches, it is essential that all switching occurs only in the ungrounded conductors. The ungrounded conductors carry the current from the power source to the load, allowing for safe operation of the switches. In a three-way switch setup, two switches control a single load from different locations, while the four-way switch adds additional control points.

Using ungrounded conductors for switching ensures that the circuit is safely operated without exposing any grounded or neutral components to unintended interruption or current flow. Grounded conductors are typically connected to the ground for safety purposes and should not be involved in the actual switching operation, as this could lead to hazards like electrocution or equipment damage.

Interference with neutral or grounded conductors can also cause imbalances in the electrical system, potentially leading to tripped breakers or other malfunctions. Thus, ensuring that all switching occurs in the ungrounded conductors is crucial for both functionality and safety in electrical systems.