The Power Distribution Network (PDN) is made up of a number of nodes located around the vessel. A power distribution node is a junction where multiple conduits meet for the purpose of power distribution. Nodes may also perform conversion between power standards.

Correctly identifying each component node relies on a designation protocol, which includes a seven-character unique identifier (UID) and additional codes to identify the node's supported power standards and power ratings.

The designation protocol is used on control consoles where PDN nodes are monitored and managed.

Node UID

The first four characters of the UID indicates its location on the vessel, in the order DECK-SECTION-PORT/STARBOARD.

For example 5FS indicates the node is located on deck five, section F, on the starboard side.

The remaining four characters are a unique numeric code.

Power Standard

1DN: designates the node as part of the primary distribution network supplying medium voltage (1000V) DC power.

2DH: designates the node as part of the secondary distribution network supplying high-frequency (400Hz) AC power at 440 volts.

2DL: designates the node as part of the secondary distribution network supplying low-frequency (50Hz) AC power at 240 volts.

Conduits

Conduits are designated by a unique numeric code which is always prefixed by the letter 'C'.

Location is not specified in conduit designations as a conduit will likely travel through multiple sections and between multiple decks.