AIR FORCET.O. 10M1-7-9-1-1ARMYTM 11-5895-1021-14/1MARINE CORPSTM 08045-15/1Figure 4-1. Typical Three-Shelter Data Link4-9. The intercom system consist of intercom sets, power supplies, and cabling. The intercom sets have 16 transmitchannels and 1 receive channel. The sets operate from regulated +12 Vdc supplied by an adjustable, regulated dc powersupply. Refer to the Intercom manual TO 31S1-4-221-1 for detailed circuit analysis of the intercom set.4-10.POWER DISTRIBUTION.4-11.Segment power is distributed by cables from a Distribution Box J-3336 Figure 4-2 is a segment powerdistribution diagram.4-12.A junction box on the J-3336 distributes 115 V, 3-phase, 60 Hz to eight output connectors. From these eightconnectors, power is cabled to the air conditioner groups (ACG) and frequency converters. The frequency converterconverts the 60-Hz power to 115 V, 3-phase, 400 Hz for shelter power.4-2
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