How many 3-way switches and 4-way switches are needed to control a single stairway luminaire from four separate locations?

To control a single stairway luminaire from four separate locations, you need to understand the wiring configuration involving 3-way and 4-way switches.

In a typical setup where one luminaire is controlled from multiple locations, the arrangement begins and ends with 3-way switches, with 4-way switches positioned in between. For four locations of control, you start with a 3-way switch at the first location. Then, to add control from additional locations, you use 4-way switches. Specifically, for four total control points, you need one additional 3-way switch at the last location, while the two in-between would use 4-way switches.

Thus, the configuration requires:

• Two 3-way switches at the start and end,

• Two 4-way switches in between each of the 3-way switches.

This setup allows for effective control of the luminaire from all four specified locations, making the need for two 3-way switches and two 4-way switches the correct answer. This arrangement adheres to the standard electrical practices for multi-location switch controls in residential wiring.