Those who design lighting systems for the spectator seating area of indoor sports arenas have expressed concern about the possibility of luminaires suffering damage during play and putting spectators at risk. According to the 2005 NEC, what is the correct choice for this application?

A) A high-bay type luminaire with an open bottom and a manufacturer-installed lens to protect people beneath the luminaire from any broken or shattered glass. This luminaire uses a standard metal-halide lamp
B) A high-bay type luminaire that uses a standard metal-halide lamp and a manufacturer-installed wire guard that consists of #9 wire
C) A high-bay type luminaire that uses a standard metal-halide lamp and an open bottom
D) The NEC doesn't include a requirement of any type for this installation

Answer: A)

A new section, 410.4(E), requires protection from possible damage. The luminaire must have a lens or glass to protect people beneath the luminaire. Per this section, open-bottom luminaires that use mercury vapor or metal-halide lamps aren’t permitted.

Owen is the owner and president of National Code Seminars and the holder of master electrician certifications in 46 states. He can be reached at necexpert@aol.com.