Figure 3-8.-Cable tag.

for each cable is shown on the ship's electrical wiring

CABLE MARKING

prints.

The new cable marking system for power and

Metal tags embossed with the cable designation are

lighting cables consists of three parts in sequence:

used to identify all permanently installed shipboard

source, voltage, and service, and where practicable,

electrical cables. These tags (fig. 3-8) are placed on

destination. These parts are separated by hyphens.

cables as close as practicable to each point of

The letters used to designate the different services

connection, on both sides of decks, bulkheads, and other

are as follows:

barriers to provide identification of the cables for

maintenance and replacement.

CInterior communications

Two systems of cable marking (the old and the new)

DDegaussing

are in use aboard Navy ships. The old system uses the

color of the tag to show cable classification (red-vital,

GFire control

yellowsemivital, and gray or no colornonvital), and

KControl power

the following letters to designate power and lighting

LShip's service lighting

cables for the different services:

NNavigational lighting

CInterior communications

PShip's service power

DDegaussing

RElectronics

FShip's service lighting and general power

CPCasualty power

FBBattle power

ELEmergency lighting

GFire control

EPEmergency power

MSMinesweeping

FLNight flight

PElectric propulsion

MCCoolant pump power

RRadio and radar

MSMinesweeping

RLRunning, anchor, and signal lights

PPPropulsion power

SSonar

SFSpecial frequency power

FEEmergency light and power

In the new system, voltages below 100 volts are

Other letters and numbers are used with these basic

designated by the actual voltage; for example, 24 volts

letters to further identify the cable and complete the

for a 24-volt circuit. The numeral 1 is used to indicate

designation. Common marking of a power system for

voltages between 100 and 199; 2 for voltages between

successive cables from a distribution switchboard to

200 and 299; 4 for voltages between 400 and 499; and

load would be feeder, FB-411; main, 1-FB-411;

so on. For a three-wire (120/240) dc system or a

submain, 1-FB-411-A; branch, 1-FB-411-A1; and

three-wire 3-phase system, the number used indicates

subbranch, 1-FB-411-A1A. The feeder number, 411, is

the higher voltage.

indicative of the system voltage. The feeder numbers for

The destination of cables beyond panels and

a 117- or 120-volt system would range from 100 to 190;

switchboards is not designated except that each circuit

for a 220-volt system, from 200 to 299; and for a

alternately receives a letter, a number, a letter, and a

450-volt system, from 400 to 499. The exact designation

number, progressively, every time that it is fused. The

destination of power cables to consuming equipment is

not designated except that each cable to such equipment

receives a single-letter alphabetical designation,

beginning with the letter A.

Where two cables of the same power or lighting

circuit are connected in a distribution panel or terminal

box, the circuit classification is not changed. However,

the cable markings have a suffix number (in

Figure 3-8.-Cable tag.

parentheses) indicating the cable section. For example,

3-13