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On the P5-13 panel, put the BAT switch in the OFF position.

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24-21-91 Page 502  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/03 

MANUAL CONTROL - MAINTENANCE PRACTICES (APPLY POWER)
1. General

A.  The following procedures outline application of electrical power to the buses. Maintenance or ground servicing may be performed by energizing the ac and dc buses from external power (ground power cart), APU power or engine-driven generator power. The procedures also outline removal of power from the airplane. In each procedure the BAT switch is placed to OFF after removal of power source. If the BAT switch is left in the ON position with no ac power on the airplane, the storage battery will discharge at a rate of approximately 10 amps per hour, fully discharging the battery after a few hours.
B.  When an external power supply or an APU generator is connected to the buses, the system will not parallel either power source with the main-engine driven generator power.
C.  The dc buses are supplied from transformer rectifier units TR1, TR2, and TR3. The TR units supply power to 28V dc bus 1 and 28V dc bus 2 from 115V ac generator bus 1 and 115V ac generator bus 2, respectively. TR3 is a backup for TR1 and TR2.
WARNING:  PRIOR TO APPLYING ELECTRICAL POWER INSURE THAT PERSONNEL ARE NOT EMPLOYED IN REMOVAL OR INSTALLATION OF ELECTRICAL OR ELECTRONIC EQUIPMENT. HIGH VOLTAGES PRESENT CAN BE FATAL.
D.  Power is supplied to the 115 volt ac standby bus from the 115 volt ac transfer bus 1 when the 115V ac generator bus 1 is energized, the STANDBY POWER switch is placed to AUTO and the BATTERY switch is placed to ON. The 115V ac generator bus 2 will supply transfer bus 1 when BUS TRANSFER switch is in AUTO position and only generator bus 2 is energized.
2.  Apply External Power
A.  General

(1)  
The airplane is provided with an ac external power receptacle located near the nose wheel well. Electrical power may be applied to the buses by connecting external power to the receptacle.

(2)  
Ground service circuits (such as ceiling lights and service outlets) are energized from the ground service buses. Power may be applied to ground service buses without energizing all other buses by placing GROUND SERVICE switch on forward attendant's panel P13 to ON.

B.  Equipment and Materials
(1)  External power supply 115/200 volt ac, 3-phase, 400 Hz nominal.
C.  Apply power to buses.

(1)  
Open external power receptacle door.

(2)  
Install power cable.

WARNING:  PRIOR TO CONNECTING THE EXTERNAL ELECTRICAL POWER SOURCE CABLE TO THE AIRPLANE ENSURE THAT ELECTRICAL POWER IS REMOVED FROM THE CABLE. INJURY TO PERSONNEL AND/OR DAMAGE TO EQUIPMENT COULD RESULT IF ELECTRICAL ARCING OCCURS.
501 
Oct 20/83  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  24-22-0 Page 201 

(a)  
Insert connector into P19 receptacle and energize external power cable.

(b)  
Observe that CONN and NOT IN USE lights on P19 illuminate and that GROUND POWER AVAILABLE light on electrical systems control panel P5 illuminates.

NOTE: NOT IN USE light will not illuminate when refuel panel door is open.
(3)  
Check that BUS TRANS switch on P5 is set to AUTO.

(4)  
Place BAT switch on P5 to ON.

(a)  Observe that TRANS BUS OFF, BUS OFF, and GEN OFF BUS lights above GEN 1 and GEN 2 switches on P5 illuminate.

(5)  
Supply power to buses.

CAUTION:  LIMIT LOAD ON EXTERNAL POWER SYSTEM TO 175A OR DAMAGE TO EXTERNAL POWER SYSTEM COMPONENTS MAY RESULT.
(a)  
Place AC meter selector switch on panel P5 to GRD PWR and observe that voltmeter reads 115 ±5 volts ac and frequency meter reads 400 ±10 Hz nominal.

(b)  
Apply power to 115V ac generator bus 1 and 115V ac generator bus 2 by placing GROUND POWER switch on P5 to ON. Observe that NOT IN USE light on P19 extinguishes and that TRANS BUS OFF and BUS OFF lights on P5 extinguish.

D.  Remove power from buses.
(1)  
Place GROUND POWER switch on P5 to OFF.

(a)  Observe that TRANS BUS OFF and BUS OFF lights on P5 illuminate.

(2)  
Place BAT switch on P5 to OFF.

(a)  Observe that TRANS BUS OFF and BUS OFF lights on P5 extinguish and NOT IN USE light on P19 illuminates.

(3)  
Remove external power connector from external power receptacle. Observe that CONN and NOT IN USE lights on P19 extinguish and GROUND POWER AVAILABLE light on P5 extinguishes.

WARNING:  BEFORE REMOVING EXTERNAL POWER CONNECTOR INSURE POWER HAS BEEN TURNED OFF AND NO RESIDUAL VOLTAGE IS PRESENT AT CONNECTOR. ELECTRICAL SHOCK COULD RESULT IF VOLTAGE IS PRESENT.
　
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