PT receptacle (fig. 11), and the re-
maining 9 pairs are spares. The
binding post signal entrance box
cover is equipped with folding side
panels for weather protection and
is secured with captive-screw fas-
teners.
The power distribution panel is
located on the rear, wall of the
shelter (fig. 14). A glowlamp, as-
sociated with each power distri-
bution c i r c u i t breaker switch,
lights when the switch is at ON.
(6) Signal entrance panel. The sig-
nal entrance panel is located on
the rear wall of the shelter (fig.
14). The panel is equipped with a
MSC-31, power cable assembly and reel.
removable cover that provides
access to the rear of the binding
posts mounted in the binding post
panel ((5) below) to the equipment
signal entrance box (fig. 9).
p owe r duct receptacles (fig. 11
b. Switchboard, Telephone, Manual SB-
through 14, and 16). Signal connec-
22(*)/PT. The SB-22(*)/PT (TM 11-5805-
tions are made at the 26-pair cable
262-12) is shelf mounted in a mounting rack
receptacle and to the PHONE and
above the curbside tabletop (fig. 11). It is
INTERCOM binding posts in the
a local battery switchboard with facilities
power and signal entrance box or
for switching a maximum of 12 telephone
to the binding posts in the binding
and voice frequency (vf) teletypewriter
post signal entrance box ((4) below).
circuits.
(3) Power and signal entrance box.
c. Telephone Set TA-312/PT. One TA-
312/PT (TM- 11-2155) is mounted (less
trance box is mounted in the exte-
carrying case) on top of the SB-22(*)/PT
rior rear wall of the shelter (fig.
mounting rack (fig, 11). Three TA-312/
5). The power and signal entrance
PT's are located in a storage cabinet; when
box contains receptacles and bind-
required for use, they should be placed on
ing posts for connecting ac power
the roadside tabletop (fig. 12) adjacent to
the PHONE jacks. The TA-312/PT's are
20) circuits to the shelter. It also
used for local telephone communication.
contains a duplex convenience ac
receptacle (115V AC) equipped with
a spring-loaded, watertight cover.
The power and signal entrance box
cover is equipped with folding side
panels (not shown) for weather
tric heaters are secured in their mounting
protection and is secured with
bases on the floor of the shelter (fig. 12).
captive-screw fasteners.
Each heater contains a 1.5-kilowatt heating
(4) Binding post signal entrance box
element and a fan for air circulation. The
fan operates when the heater is turned on,
entrance box on the exterior rear
but it may also be operated independently.
wall (fig. 5) contains 21 pairs of
Horizontal louvers on the front of each
binding posts; 12 pairs of binding
heater are adjustable to deflect the air
posts are wired to the SB-22(*)/
stream. The operating controls are located
