ARMY TM 9-6115-604-12
NAVY NAVFAC P-8-633-12
3-11. MAINTENANCE OF AC POWER GENERATION AND CONTROL SYSTEM.
Visually Inspect Main Disconnect Switch S120. (See Figure 3-8.) Main disconnect switch S120 is located in
the control room behind the lower door to cabinet A.
DANGER HIGH VOLTAGE
Do not touch exposed electrical connections when a source of power or another generator set is
connected to the load terminals. Death or Injury may result from failure to observe this warning.
To avoid injury to personnel, no electrical component will be worked on while energized. Ensure
equipment Is "tagged out" In accordance with Chapter Chapter 1, Section III, of this manual and
equipment is NOT energized. Residual voltage Is present at the generator leads with the regulator
turned off, reaching SEVERAL HUNDRED VOLTS on the generator set. Proper insulation and
isolation of metering equipment must be observed when testing this generator. USE PROPER
TEST EQUIPMENT TO CHECK FOR VOLTAGE before proceeding with work.
Open lower cabinet A door.
Visually inspect the main disconnect switch S120 for severe discoloration or deterioration of the conductors or
Close the compartment door.