Table 1. Main Switchboard Interlocks

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Figure 1. Main Switchboard Block Diagram (Sheet 1 of 2)

TM-55-1925-273-10-1 Inland and Coastal Large TUG (LT) NSN 1925-01-509-7013 (EIC XAG) Manual

EMERGENCY SWITCHBOARD

TM 55-1925-273-10-1

0034 00

Table 1. Main Switchboard Interlocks

NOTE

The following interlock conditions occur when the SSDG 1, SSDG 2, or shore power is feeding

the main switchboard, the main bus tie is closed, and the FEEDBACK switch is in the NORMAL

position:

Circuit Breaker Closed

Cannot Close

SSDG 1 Circuit Breaker

Shore Power Circuit Breaker

SSDG 2 Circuit Breaker

Shore Power Circuit Breaker

SSDG 1 Circuit Breaker

Shore Power Circuit Breaker

SSDG 2 Circuit Breaker

Main Bus Tie Circuit Breaker

EDG Circuit Breaker

(Emergency Switchboard)

1S/E Bus Tie Circuit Breaker

2S/E Bus Tie Circuit Breaker

1S/E Bus Tie Circuit Breaker

NOTE

The following interlock conditions occur when the Emergency Diesel Generator is running, and

the FEEDBACK switch is in the NORMAL position:

Circuit Breaker Closed

Cannot Close

EDG Circuit Breaker

Main Bus Tie Circuit Breaker

(Emergency Switchboard)

NOTE

The following interlock conditions occur when the EDG is running, and the FEEDBACK switch

is in the FEEDBACK position:

Circuit Breaker Closed

Cannot Close

EDG & Main Bus Tie Circuit Breaker

SSDG #1 Circuit Breaker

(Emergency Switchboard)

EDG & Main Bus Tie Circuit Breaker

SSDG #2 Circuit Breaker

(Emergency Switchboard)

EDG & Main Bus Tie Circuit Breaker

Shore Power Circuit Breaker

(Emergency Switchboard)

0034 00-3