NEC Commercial Electrical Practice Test

How many risers must be present for switches to be required at each end of an interior stairway?

1. 4

2. 5

3. 6

4. 7

The correct answer is: 6

For switches to be required at each end of an interior stairway, there must be a specific number of risers involved. According to the National Electrical Code (NEC), the requirement for having a switch at both the top and bottom of a staircase comes into play when there are six or more risers. The reasoning behind this is related to safety and convenience, ensuring that individuals can easily access and control the lighting at both ends of the stairway. This enhances visibility and helps to prevent accidents. When there are fewer than six risers, the need for dual switches is not mandated, as it is generally considered sufficient to have one switch. Thus, the presence of six risers is the defining factor for establishing the necessity for switches at both the top and bottom of the stairway.