For controlling a load in three different locations, what type of switch is needed?

To control a load from three different locations, a four-way switch is required. This type of switch functions as an intermediary control that allows for multiple switches (at least two three-way switches and one or more four-way switches) to operate a single load.

In a three-way switch setup, you can control a load from two locations. However, when you need control from a third location, you must incorporate a four-way switch into the circuit. The four-way switch enables the additional control point.

The configuration typically involves two three-way switches at the end points of the circuit and one or more four-way switches in between them. This arrangement allows for the circuit to be toggled from any of the switches, modifying the load state as desired.

Understanding the requirements of different locations is crucial for effective circuit design, particularly in residential and commercial applications where multiple control points are necessary.