Kohler 27EFOZ/32EOZ, 8.5EFOZ manual Electrical System, AC Voltage Connections, Circuit Protection

Section 6 Electrical System

WARNING

Hazardous voltage. Moving rotor.

Can cause severe injury or death.

Operate the generator set only when all guards and electrical enclosures are in place.

Electrical backfeed to the utility. Hazardous backfeed voltage can cause severe injury or death. Connect the generator set to the building/marina electrical system only through an approved device and after the building/marina main switch is opened. Backfeed connections can cause severe injury or death to utility personnel working on power lines and/or personnel near the work area. Some states and localities prohibit unauthorized connection to the utility electrical system. Install a ship-to-shore transfer switch to prevent interconnection of the generator set power and shore power.

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1.	Line side	585771
2.	AC circuit breaker
3.	Load side
4.	L1/L2 phase (black) leads
5.	GRD ground (green) lead
6.	L0 neutral (white) lead

Figure 6-1 AC Voltage Connections in Controller Box (5--32EOZ Models, Typical)

6.1 AC Voltage Connections

Make AC connections to the generator set inside the controller box (4--27EFOZ and 5--32EOZ models) or inside the junction box (33--125EFOZ and 40--150EOZ models). Typically, the generator set connects to a ship-to-shore transfer switch that allows the use of shore/utility power when docked or generator set power when docked or at sea. The wiring then connects to a main circuit breaker box (panel board) that distributes branch circuits throughout the craft. See Figure 6-1 for AC voltage connections to the generator set. See Section 8 for reconnection of the generator set.

6.2 Circuit Protection

The AC circuit breakers (optional) protect the wiring from the AC circuit breakers to the vessel’s distribution panel. AC circuit breakers trip when they detect a fault in the output circuit.

After correcting the fault, reset the AC circuit breaker(s) by placing them in the ON position. Restart the unit. Do not start the unit under load. See Figure 6-2 or Figure 6-3 for AC circuit breaker ratings. The unit’s voltage configuration determines the circuit breaker selection.

Note: Circuit breaker ampere rating and availability are subject to change.

6.2.1Circuit Breaker Considerations

Mounting location. Mount the circuit breakers in the generator set’s controller (4--27EFOZ and 5--32EOZ models) or the generator set’s junction box (33--125EFOZ and 40--150EOZ models). See Section 6.2.2 or Section 6.2.3.

Note: 3.5EFOZ and 4EOZ models already have circuit breakers installed.

Sizing. Use the generator set voltage/frequency configuration to determine the circuit breaker amperage. If the generator set voltage configuration changes, change the circuit breaker to provide optimum protection.

For circuit breaker application and selection information, contact an authorized distributor/dealer.

Have a qualified electrician or technician install circuit breakers and reconnect the generator set. Comply with all governing standards and codes.

TP-6069 6/03 Section 6 Electrical System 19