[Selector switches shall be of the single-compartment, 3-position type,
Line 1 - Open - Line 2, consisting of an interrupter switch in series with
a selector switch.] [Duplex switches shall be of the dual compartment type
with 2 interrupter switches.]
a. Ratings. Fuse continuous current ratings shall be as indicated for
the transformer for an incoming line unit and for the line tie unit.
Unless otherwise indicated, fuses shall be of the current limiting
type. Switch ratings at 60 Hz shall be:
Nominal voltage............................................[_____].
Rated maximum voltage......................................[_____].
Maximum symmetrical interrupting capacity..................[_____].
Maximum asymmetrical interrupting capacity.................[_____].
3-Second short time current carrying capacity..............[_____].
Rated continuous current...................................[_____].
BIL........................................................[_____].
b. Basic Requirements. The electrical devices listed below shall be
rated for the application and voltage and current indicated. Unless
otherwise noted, manufacturer's standard devices shall be provided and
shall include the following:
(1) A switch-operating handle with provisions for locking in
either the open or closed position.
(2)
A switch mechanical position indicator.
(3) A heater continuously energized to prevent condensation over
an ambient temperature range of [minus [29] [_____] degrees C] to
[[40] [_____] degrees C] [minus [20] [_____] degrees F] to [[40]
[_____] degrees F] at 90% relative humidity and wired in series
with a cabinet door-actuated switch, so the heater is de-energized
when doors are open. High-temperature thermal protection shall be
included.
(4) One-pole or 2-pole thermal-magnetic, molded-case circuit
breakers suitable for the operating voltage for heater circuits.
(5) Safety devices as necessary to ensure that the load
interrupter switch is in the open position whenever unit doors are
in the open position.
(6)
A key interlock if indicated.
(7) An interface terminal block wired for required exterior
connections.
2.9.1.2
Transformer Section
**************************************************************************
NOTE: Refer to TM 5-811-1/AF AFJMAN 32-1080 for
guidance. Delete alarm contacts when not required
SECTION 16375A
Page 28
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