Figure 3-1.--Power distribution in a large combatant ship.
within the electrical zone in which it is located. Thus,
zone control is provided for all power within the
CREW LIVING SPACE, FRAMES XX -XX
electrical zone. An emergency switchboard may supply
more than one zone.
In small installations (fig. 3-2), the distribution
LIGHTING PANEL 4-108-2
panels may or may not be fed directly from the generator
and distribution switchboards. The distribution panels
and load centers, if installed, are located centrally with
respect to the loads that they feed. This arrangement
If a panel contains two or more sets of buses and each
simplifies the installation and requires less weight,
set is supplied by a separate feeder, the number of each
space, and equipment than if each load were connected
feeder is indicated on the identification plate.
to a switchboard.
Distribution panels have circuit information plates
next to the handle of each circuit breaker or switch.
These plates contain the following information in the
1. The circuit number
All distribution panels and bus transfer equipment
have cabinet information plates (shown below). These
2. The name of the apparatus or circuit controlled
plates contain the following information in the order
3. The location of the apparatus or space served
4. The circuit breaker element or fuse rating
1. The name of the space, apparatus, or circuits
Vital circuits are shown by red markers attached to
circuit information plates. In addition to the red marker,
2. The service (power, lighting, electronics) and
information plates for circuit breakers supplying circle
W- and circle Z-class ventilation systems contain, the
class designation of the ventilation system supplied.
3. The supply feeder number