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Indicator lights, lamps and alarms
Switching Equipment, Combat System, Command and Control, Fire Control, And Interior Communication General Specification
Fuses, fuseholders, fusing, and circuit breakers

1 / On 50-V circuits, use one 2-watt 620-ohm voltage dropping resistor for each
lamp.  On 28-V circuits, use one l-watt 100-ohm voltage dropping resistor
for each lamp. On 115 V d.c. circuits use one 7-watt 2260-ohm voltage
dropping resistor for each lamp.
2 / AIH lamps require the use of an external l/4-watt 47K ohm current limiting
2 / Conforming to MIL-L-15098 and MIL-L-15098/11. Indicator light and push button switch combinations shall be in
accordance with MIL-S-22885, as specified in the ATDP. Power available lights.  Unless otherwise specified in the ATDP,
power available indicator lights in accordance with MIL-S-22885 shall be provided
for supply circuits entering a switchboard, other control switchboards, and
control system components.  For 3-phase power supplies, power available lights
shall be provided for all three phases.  Power available lights need not be
provided on I.C. switchboards for supplies which are connected via ABT switches
having power available lights that are visible to the switchboard operator. The cutouts for indicator lights or indicator light and push
button switches shall conform to the applicable specification sheet of
MIL-S-22885. Lamps.  Lamps shall be in accordance with MIL-L-6363, MIL-L-15098
and MIL-L-15098/11 for the applications as specified in table II.  Lamps used for
control indicator dial illumination shall be energized from the secondary of
a transformer, and the lighting circuit shall be equipped with a control device
to vary light intensity from maximum value to full extinction when all lamps,
or 50 percent of the lamps are operative.  At 115 V input to the illumination
transformer, and with all lamps operative, the lamp socket voltages shall not
exceed the values as shown in table II.  Rheostats shall not be used. Bus failure alarms.  Provision shall be made on main I.C. switch-
boards for connection of a bus failure alarm to each 28 V, 50 V, 120 V and 450 V
bus (see figure 3) unless it is supplied from a local source for which audible
power failure indication already exists (see 6.2.1). Bus failure alarms shall be in accordance with Drawing
804-1853042, type IC/EIDl in accordance with MIL-A-15303, except for constant
frequency buses which shall be as specified in When used to monitor
28 V, d.c. or 50 V, d.c. buses, type IC/EIDl alarms shall be connected to 120 V,
60 hertz (Hz) power, and controlled by a relay connected to the bus.  When used
to monitor 450 V, 60 or 400 Hz buses, type IC/EIDl alarms shall be connected
to the bus through a transformer to provide the necessary operating voltage to
the alarm unit.  Associated batteries, relays, and transformers shall be
furnished by the installin~ activity. The alarm circuit for the constant frequency bus shall provide
for indication of maloperation or failure of the constant frequency control
unit.  The circuit arrangement shown on figure 3 shall be followed.  An audible
signal (type IC/BlS4, or H2S4) in accordance with MIL-A-15303, and all necesary
relays, will be furnished by the switchboard installing activity.

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