TM 9-6150-228-13&P
CHAPTER 2
OPERATING INSTRUCTIONS
SECTION I. DESCRIPTION AND USE OF OPERATOR'S CONTROLS AND
INDICATORS
2.1 POWER DISTRIBUTION PANEL CONTROLS, INDICATORS, AND CONNECTORS.
2.1.1
Interlock. 400-Amp Circuit Breakers. The sliding bar assembly (1, Figure 2-1) is mounted to the top panel over
the main circuit breakers CB1 and CB2. These two 3-phase circuit breakers are wired in series between the input load
terminals on TB1 and TB2 and the power distribution panel bus bars. Either circuit breaker will prevent input to the
power distribution panel from exceeding a total current of 400 amps per phase (144 KVA maximum load). The main
circuit breakers enable the operator to select from two possible sources of input power when TB1 and TB2 are connected
to separate generators. These circuit breakers also allow the operator to turn off power to all output circuit breakers.
This bar functions as a manual safety interlock by physically preventing both main circuit breakers from being dosed
simultaneously. When two sources of input are connected, there is no chance of power from both being applied to the
bus bars at the same time. In addition, this interlock prevents input power from one set of load terminals from being
applied to the remaining set of input terminals.
2.1.2
Phase Indicator lights (DS1. DS2. and DS3). These three indicators (2) are located on the top panel below
CB1 and CB2 respectively. Indicator DS1 is wired between neutral and phase A bus bar. Indicator DS2 is wired between
neutral and phase B bus bar. Indicator DS3 is wired between neutral and phase C bus bar. In this way, when power is
available at the output side of either main circuit breakers, the associated indicator light(s) will glow green.
2.1.3
Circuit Breaker. 1 00-Amp. 3-Phase (CB3 through CB6). Each 3-phase circuit breaker (3) is in series between
the bus bars and a 1 00-amp output connector. These circuit breakers prevent output power to the associated connector
from exceeding a current of 100 amps per phase (36 kW maximum load). These circuit breakers also enable the
operator to turn power to individual 100-amp load circuits off and on as required.
2.1.4
Circuit Breaker. 60-Amp. 3-Phase (CB7 through CB16). Each 3-phase circuit breaker (4) is in series between
the bus bars and 60-amp output connector. These circuit breakers prevent output power to the associated connector
from exceeding a current of 60 amps per phase (21.6 kW maximum load). These circuit breakers also enable the
operator to turn power to individual 60-amp load circuits off and on as required.
2-1
