TM
5-811-1/AFJMAN
32-1080
control possible with the tubular shape. Low-
that reason, HID ballasts will be specified by the
pressure sodium lighting is also not included, as
operating characteristics desired. When ballast
the color is monochromatic and therefore is not
specifications cover indoor lamps the ANSI lamp
considered suitable for general use. The amount of
ambient temperature range of 50 degrees F and
sodium in low-pressure sodium lamps requires
above may he more appropriate than extending
special disposal methods if such lamps are not to
the range down to 5 degrees F, minus 22 degrees
pose a fire hazard. Incandescent lighting has not
F, or minus 40 degrees F which are also available.
been included because of the extremely low lumi-
10-6. lighting Control and Wiring System.
nous efficacy and short lamp life. Mercury vapor
a. On-off control. Luminaires for dusk to dawn
lighting is also not included because of lower
operation will normally be controlled by a photo-
luminous efficiencies, poor lumen maintenance,
higher life cycle costs, and environmental consider-
electric cell installed on each luminaire; however,
ations (mercury propagation and disposal).
central control may be more economical for lumi-
c. Lamp designations. Lamps will be designated
naires having fixed hours of operation. An auto-
in accordance with the requirements of ANSI
matic system using a time switch with an astro-
C78.380 in order to provide nationally applicable
nomical dial or a manual on-off control will be
and convenient lamp identification symbols. These
used for such cases.
b. Type of system. Multiple wiring systems will
designations ensure interchangeability of lamps
bearing the same symbol. Each lamp bearing an
be installed, except for extensions to existing
ANSI designation has been provided with that
series systems or for long access roads where
specific designation in accordance with the method
voltage drops exceeding that permitted for multi-
shown on figure 10-4. Although technically low-
ple lighting systems would occur. Circuits for
pressure sodium lamps are not HID lamps, they
multiple lighting will be designed to utilize the
are included under ANSI C78.380 as a conve-
highest low-voltage level appropriate for the in-
nience.
stallation in order to keep wire sizes and voltage
drops to a minimum. Lamps will be connected
operating characteristics vary dependent upon the
phase-to-neutral rather than phase-to-phase. Where
type of ballast circuit provided. Both ANSI C82.4
practicable, units will be connected to transform-
and manufacturer's terminology for ballasts can be
ers which serve other loads. Protection and discon-
confusing and sometimes appear contradictory. For
nection of lighting circuits will be provided.
a
This material is based on information provided in the ANSI Standard enti-
tled "Method for the Designation of High-Intensity-Discharge Lamps" ANSI
C78.380.
Figure 10-4. Key to Standard HID Lamp Designations.
10-6
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