TP-5982 4/0630 Section 6 Electrical System
Note: Circuit breaker ampere rating and availability are
subject to change.
6.2.1 Circuit Breaker Considerations
Mounting location. Mount the circuit breakers in the
generator set controller (5/7.3E, 4/6EF, 15/20C, and
12.5/16CF models) or inside the junction box
(5/7.3ECD, 4/6EFCD, 10/13/15EG, and 13/15EGZ
models).
Sizing. Use the generator set voltage/frequency
configuration to determine the circuit breaker
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.
Note: Ignition-protected circuit breakers. Use only
ignition-protected circuit breakers on marine
gasoline generator sets. See CFR 33, Part
183.410 for ignition-protection requirements. Do
not use standard circuit breakers.
Have a qualified electrician or technician install circuit
breakers and reconnect the generator set. Comply with
all governing standards and codes.
Accidental starting.
Can cause severe injury or death.
Disconnect the battery cables before
working on the generator set.
Remove the negative (--) lead first
when disconnecting the battery.
Reconnect the negative (--) lead last
when reconnecting the battery.
WARNING
Disabling the generator set. Accidental starting can
cause severe injury or death. Before working on the
generator set or equipment connected to the set, disable the
generator set as follows: (1) Place the generator set start/stop
switch in the STOP position. (2) Disconnect the power to the
battery charger, if equipped. (3) Remove the battery cables,
negative (--) lead first. Reconnect t he negative (--) lead last
when reconnecting the battery. Follow these precautions to
prevent the starting of the generator set by the remote
start/stop switch.
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
areinplace.
Moving rotor.
WARNING
Grounding electrical equipment. Hazardous voltage can
cause severe injury or death. Electrocution is possible
whenever electricity is present. Turn off the main circuit
breakers of all power sources before servicing the equipment.
Configure the installation to electrically ground the generator
set, transfer switch, and related equipment and electrical
circuits to comply with applicable codes and standards. Never
contact electrical leads or appliances when standing in water
or on wet ground because these conditions increase the risk of
electrocution.
Short circuits. Hazardous voltage/current can cause
severe injury or death. Short circuits can cause bodily injury
and/or equipment damage. Do not contact electrical
connections with tools or jewelry while making adjustments or
repairs. Remove all jewelry before servicing the equipment.
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.
Note: Voltage/frequency adjustable. Some four-lead
generator sets are not voltage/frequency
adjustable. To determine adjustment
possibilities, check the model’s specification
sheet or service manual. If you are reconnecting
the generator set from a single voltage to a
dual-voltage configuration (example: from 120
volt to 120/240 volt) or a dual voltage to a single
voltage (example: from 120/240 volt to 120 volt)
with the same primary voltage, do not adjust the
voltage/frequency adjustment. Adjust the
voltage/frequency for frequency changes or
setting changes of the primary voltage (example:
from 120 volt to 100 volt).
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