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The NEC (USA National Electric Code) clearly outlines these requirements.What is the NEC? The NEC is administered by the National Fire Protection Association (NFPA) and is revised every three years. The current NEC standard is currently available from the NFPA at www.nfpa.org.
What changed in the NEC? The NEC change regarding open luminaires is the new section 410.73(F)(5) that states, "Metal Halide Lamp Containment. Luminaires (fixtures) that use a metal halide lamp shall be provided with a containment barrier that encloses the lamp, or shall be provided with a physical means that only allows the use of a lamp that is Type O."Therefore, to meet the NEC requirements, luminaires that use metal halide lamps must either:
ANSI Type E = Enclosed Fixture RequiredLamps that are enclosed fixture rated should only be operated in an enclosed fixture that safely contains all lamp parts in the event of a lamp burst or rupture. These lamps operate at a high internal pressure and at high temperatures which can emit harmful ultraviolet light if the outer glass bulb is broken. A lamp may burst causing physical injury and property damage unless protective safety glass is used with the fixture. Must use a fixture that meets requirements per UL standard #1572 and #1598.
ANSI Type O = Open Fixture RatedLamps that are open fixture rated are suitable for operation in open fixture designs. These types of lamps typically feature UV protective quartz and a secondary shroud surrounding the arc tube to prevent the scatter of glass in the event of a burst. This type meets the ANSI criteria for containment rated operation.
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