ANSI C78.24-2001 pdf download Two-inch (51 mm) Integral-reflector Lamps with Front Covers and GU5.3 or GX 5.3 Bases
1 Scope
This standard specifies the detailed lamp dimensions for those lamps in the family of two-inch (51-mm) integral-reflector lamps with GU5.3 or GX5.3 bases and front covers. These lamps are intended for use in general lighting applications.
2. Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this American National Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this American National Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
ANSI C78.1 41 3-1989 (R94), American National Standard for Electric Lamps – Two Inch (51mm) Integral-Reflector – Rim Reference Projection Lamps – Dimensions of Centering Systems
ANSI C81 .61 -1990 (R96), American National Standard for Electric Lamp Bases.
ANSI C81 .62-1991 (R96), American National Standard for Electric Lamp Holders.
ANSI C81 .63-1991 (R96), American National Standard for Electric Lamp Bases
and Lampholder Gauges.
3. Lamp Designations
Lamp dimensions are specified in Figure 1 . Only those dimensions essential to interchangeability are given. The drawn shape of the reflector and neck area are not intended to specify or restrict the outer surface of the lamp beyond the restrictions imposed by the standard for the base, ANSI C81 .61 . Dimensions of the subject lamps with front covers differ from those similar lamps without front covers that are specified in ANSI C78.1413.
For the intended application of the subject lamps, there is no need for a highly precise rim. Lamps of the subject type shall employ standardized bases GU5.3 or GX5.3. For details see ANSI C81 .61. Compliance shall be checked by the relevant gauges of ANSI C81 .63.

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