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Illustrated Changes to the NEC, 2005 Edition - Part 2

Article 410

Luminaires (Lighting Fixtures), Lampholders, and Lamps

410.73 General

Part XIII. Electric-Discharge Lighting (1,000V or Less)

New rule specifies when luminaires with metal halide lamp are to be provided with a method to help contain the arc at end-of-life arc-tube failures.

(F) High-Intensity Discharge Luminaires.
(5) Metal Halide Lamp Containment. Luminaires containing metal halide lamp, other than a thick-glass parabolic reflector lamp (PAR), must be provided with a containment barrier that encloses the lamp or the luminaire must only allow the use of a Type “O” lamp.
Figure 410-7

Author’s Comment: Fires have resulted from the spillage of hot arc tube particles from metal halide lamp failures. “O-rated” lamps have been designed to meet ANSI containment test for the installation of the metal halide lamp in an open fixture.


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