ANSI NEMA C78.1501 pdf free download

ANSI NEMA C78.1501 pdf free download.Electric Lamps 一 Tungsten-Halogen Lamps with G22 Bases and 63.5mm LCL
4.3 Lamp Characteristics
Physical, electrical, and other characteristics of standard lamps are shown in Table 1, with tolerances as appropriate.
4.4 Dimensions
4.4.1 The lamp space drawing (Figure 1) shows the maximum limits of the space that may be occupied by any part of a bulb. The space shown will accommodate the longest and shortest lamps with maximum bulb diameters, and maximum bulb excursion with respect to the base axis. A typical bulb is shown as a dashed line within the maximum space. The following general conditions apply to the construction of these drawings:
a. Straight lines are used as much as possible to simplify the outline; all compromises with the actual space are in excess of the actual space required.
b. All excursions of a lamp bulb are shown relative to a fixed-position base.
c. Bulb “eccentricity” with respect to the base axis is a combination of allowances for angular tilt and lateral displacement.
d. The base shown in the drawing represents a typical form. The essential dimensions are controlled by the “Go” gauge for G22-based lamps described in ANSI 081.63.
e. All dimensions are in millimeters (mm) unless otherwise specified.
4.4.2 The light source dimensions—width (W), height (H), and thickness (T)—in Table 1, define a maximum size volume centered on the light center length and base axis within which all luminous parts of the filament are located. This volume accounts for all positions of the filament. Actual filament size may be significantly smaller than the defined light source volume.
5 Restrictions
5.1 Operating Positions
Lamp types in this standard may operate properly in any position, or they may be restricted as to position. Such restrictions are indicated in the Operating Position column of Table 1.
5.2 Seal Temperature
In the lamps covered by this standard, the metal-to-envelope seal is intended for operation at temperatures not to exceed 4009C.
5.3 Bulb Wall Temperature
A lamp’s bulb wall temperature shall be maintained at about 25OC for proper operation of the halogen cycle. An upper limit of approximately 9OOC is recommended for maintaining the integrity of fused silica bulbs.
5.4 Shielding
A protective shield shall be provided relevant to the following cautionary notice.
To assure maximum safety during handling and use of the subject lamps, observe the following notices:
a. Tungsten-halogen lamps operate at high temperature and at internal gas pressures above atmospheric pressure. Consequently, a lamp could shatter. Certain lamps may also emit some amount of ultraviolet radiation. Therefore, a suitable protective shield, screening technique, or both shall be used with the luminaire to protect people and surroundings from both hazards.
b. Always read and observe the information contained in the lamp manufacturer’s caution notice. 6 Test Procedures
6.1 Life
Lamps shall be tested in open racks or fixtures in their specified operating position with cooling to maintain the bulb and seal temperature limits. Suggested test cycles and additional testing procedures are defined in ANSI C78.1450. It should be noted that life-test results from an open rack test procedure may not be representative of lamp life in luminaires or projection equipment.
Consult the lamp manufacturer for specific test criteria.
6.2 Seal (Pinch) Temperature
The measurement procedure is defined in ANSI/IEC C78.682.ANSI NEMA C78.1501 pdf download.