SECTION III. TECHNICAL PRINCIPLES OF OPERATION
1.11 PRINCIPLES OF OPERATION (FIGURE 1-3).
Power is supplied to the power distribution panel by a pair of generators. Each generator is connected to the
power distribution panel through a dedicated terminal bar.
The two terminal bars are each connected to the power distribution panel power buses through a 400-amp per
phase circuit breaker. The purpose of having two generators, two sets of input terminals, and two main circuit breakers is
to minimize power interruption to user's equipment. When both generators are running, the operator can switch the load
from the one power unit to the other using the main circuit breakers. The slide bar assembly prevents both inputs from
being connected to the bus bars at the same time. The slide bar also prevents the operator from inadvertently back
powering an unused input.
The power from the power distribution panel is supplied to the branch circuits which feed the user's equipment.
Ten 60-amp and four 1 00-amp power cables can be connected to the power distribution panel simultaneously. The
maximum load at any one time, however, cannot exceed the 400-amp per phase capacity of the main circuit breaker. A
dedicated circuit breaker protects each output connector repeated and its associated power cable from overloads.
Figure 1-3. Power Dlstributlon Panel Block Diagram.