ARMY TM 9-6115-604-12
NAVY NAVFAC P-8-633-12
120/240/380 Connection Board TB103 (located in bottom of cabinet C as viewed from control room). TB103 is used
when bringing In external utility power to operate the generator sets 120/240 V ac circuits. If available external power is
120/240 V ac, connection board TB103 Is used to directly connect utility power to generator set circuits. If, however, the
available power Is 380 V ac, then connection board TB103 is used to connect utility power to utility station power
transformer T103. Transformer T103 steps down and divides the voltage to provide 120/240 V ac to generator set
circuits. Set connection board TB03 as follows:
Do not connect utility power cable to UTILITY POWER receptacle unless you are
sure that connection board TB103 has been properly configured.
Check setting of connection board TB103 (refer to Figure 4-7) If already set to match available power, go to
step (6) below Otherwise, proceed as follows'
Dangerous voltages may be present at connection board TB103. Death by electro-
cution may result if the following sequential steps are not strictly adhered to.
Isolate connection board TB103 as follows:
(a) Remove utility power cable from UTILITY POWER receptacle J101 (see Figure 4-8) if installed.
(b) Set SET POWER circuit breaker CB124 (4, Figure 2-11) to OFF and UTILITY POWER circuit breaker
CB125 (5) to OFF
Refer to Figure 4-7 Remove hexagon head cap screws (1), lock washers (2), and flat washers (3) to remove
TB103 shield (4).
Set bus bars In accordance with Figure 4-7 for 120/240 V ac or 380 V ac, as required. To set a bus bar,
proceed as follows:
Remove hexagonal nuts (5) and lock washers (6) securing bus bars (7) to studs (8).
Remove bus bars (7) from studs (8) and reinstall bus bars (7) as required for 120/240 or 380 V ac
operation Refer to Figure 4-7, configuration "A" or configuration "B".
Secure bus bars (7) to studs (8) with lock washers (6) and hexagonal nuts (5).
Install TB103 shield (4) and secure with flat washers (3), lock washers (2), and hexagon head cap screws (1).
Close cabinet C door.
Interconnect generator set to utility power by connecting utility cable to utility power source and to UTILITY
POWER receptacle J101 (see Figure 4-8).
Operate circuit breaker locking beam (3, Figure 2-11) as necessary and set UTILITY POWER circuit breaker
CB125 to ON
AC Lighting and Receptacle Circuits. If an external source of utility power is available and connected to the
generator set In accordance with step h, above, then the AC lighting and receptacle circuits may be switched on. (If an
external source of utility power is not available, the AC circuits can be activated only after generator set operation has
started ) Activate circuits as follows:
Open door to distribution panel DP1
See Figure 2-8. Set CB102 through CB108 to ON.
Set CB109 to ON if control room fan operation is desired.
Close door to distribution panel DP1.
AC lights and receptacles are now operational. See Figure 2-11 for Illustration of typical ON/OFF light switch (6).