Table of Contents
Advertisement
5.3 Ground and Neutral
Connections
Ground the generator set. The grounding method must
comply with NEC and local codes.
grounding strap to the generator set ground lug,
terminal GRD inside the junction box. See Figure 5-1.
Various regulations and site configurations including the
National Electrical Code (NEC), local codes, and the
type of transfer switch used in the application determine
the grounding of the neutral at the generator. NEC 2002
Section 250.20 is one example that has a very good
explanation of the neutral grounding requirements for
generators.
Kohler generator sets are shipped with the generator
neutral attached to the generator in the junction box. At
installation, the neutral can be grounded at the
generator set or lifted from the ground stud and isolated
if the installation requires an ungrounded neutral
connection at the generator. The generator set will
operate properly with the neutral either bonded to
ground or isolated from ground at the generator.
2
1
(Junction box louvered
3
panel removed)
1. Neutral (L0) connection
2. Ground (GRD) connection
3. Customer interface connector and load lead access
locations
4. Line circuit breaker location, typical
Figure 5-1 Generator Set Electrical Connections
5.4 Line Circuit Breakers
AC circuit protection. All AC circuits must include
circuit breaker or fuse protection.
breaker for up to 125% of the rated generator set output
current. The circuit breaker must open all ungrounded
connectors.
The circuit breaker or fuse must be
36
Section 5 Electrical System
mounted within 7.6 m (25 feet) of the alternator output
terminals.
Mounting location. Mount the circuit breaker in the
generator set's junction box. See Figure 5-1 for the
Connect the
recommended circuit breaker location.
Sizing.
configuration
amperage. If the circuit breaker was sized for one
voltage configuration and later the generator set is
reconnected to a different voltage, change the circuit
breaker accordingly to provide optimum protection.
Have a qualified electrician or technician install circuit
breakers and reconnect the generator set. Comply with
all governing standards and codes.
5.5 Remote Start Connection
Connect leads 3 and 4 from the customer interface
connector to the automatic transfer switch's engine start
terminals (see Section 5.6) or to an optional remote
start/stop switch.
5.6 Automatic Transfer Switches
For a standby system, use at least one automatic
transfer switch connected to the generator set output to
automatically transfer the electrical load to the
generator set if the normal source fails. When normal
power returns, the switch transfers the load back to the
normal power source and then signals the generator set
to stop.
The transfer switch uses a set of contacts to signal the
GM58837
4
engine/generator to start. When the normal source fails
and the generator set master switch is in the AUTO
position, the transfer switch contacts close to start the
generator set.
The engine start terminals are usually located near the
transfer switch contactor with an engine start decal
identifying the terminals. Use the transfer switch wiring
diagrams to identify the engine start terminals prior to
making connections.
Use 14-gauge wire for the engine start connections.
Connect the engine start leads 3 and 4 at the customer
interface connector to the engine start terminals on the
Select a circuit
transfer switch. Refer to the transfer switch Installation
Manual for ATS connection instructions.
Use the generator set voltage/frequency
to
determine
the
circuit
breaker
TP-6609 6/08
Advertisement
Table of Contents
