NEC Commercial Electrical Practice Test

What is the prescribed switch placement at the top and bottom of interior stairs with a certain number of risers?

1. At least 4 risers

2. At least 5 risers

3. At least 6 risers

4. At least 7 risers

The correct answer is: At least 6 risers

The requirement regarding switch placement at the top and bottom of interior stairs can be found in the National Electrical Code (NEC) guidelines. For safety and functionality, it is essential that a switch be readily available to control the lighting in stairways, especially to enhance visibility and prevent accidents. In this context, the NEC specifies that if the stairway has six or more risers, it mandates the placement of switches at both the top and the bottom. This regulation ensures that people can turn the lights on before they start ascending or descending the stairs, which is crucial for safety. The rationale behind this requirement is to provide adequate illumination, as stairways can pose a risk of slips or falls when not properly lit. For stairways with fewer than six risers, the regulation is not as stringent about having switches at both locations, which is why options suggesting fewer risers do not meet the code requirements. Hence, the choice reflecting six risers aligns with the NEC standards, making it the correct answer.