Flexing Service

specialized use, such as degaussing, telephone, radio,

LSDCOP-2-- LOW smoke, double conductor, oil

resistant, portable, conductor size approximately 2000

and casualty power.

circular mils.

Type LSMDU is a multiconductor cable used in

degaussing circuits. Type LSTCJA consists of one

LSMSCA-30-- LOW smoke, multiple conductor,

conductor of constantan (red) and one conductor of

shipboard, control armored, with 30 conductors.

iron (gray), and is used for pyrometer base leads.

Most cables and cords contain a continuous, thin,

moisture-resistant marker tape directly under the cable

Flexing Service

or cord binder tape or jacket at less than 1-foot

intervals. This tape shows the name and location of the

Flexing service cable designed for use aboard ship

manufacturer; the year of manufacture; the military

is commonly referred to as being portable because it

specification number of the cable; and the progressive

is principally used as leads to portable electric

serial number. The serial number is not necessarily a

equipment. It is also of two types--general use and

footage marker. A serial number is not repeated by a

special use.

manufacturer in any one year for any one type and size

GENERAL USE.-- Flexing service cable is used

of cable or cord.

as leads to portable equipment and permanently

installed equipment where cables are subjected to

RATINGS AND CHARACTERISTICS

repeated bending, twisting, mechanical abrasion, oil,

OF CABLES

sunlight, or where maximum resistance to moisture is

required.

Table 2-2 shows the ratings and characteristics of

various cables that are included in Military

SPECIAL USE.-- There are many different types

Specification MIL-C-24643. Each cable is identified

of flexing service cable designed for special

by the MILSPEC and specification sheet number,

requirements of certain installations, including type

followed by the cable type designation, conductor size

LSTTOP and casualty power cables. Type TRF is used

(AWG or MCM), number of conductors, conductor

for arc-welding circuits.

cross-sectional area (circular mils), overall diameter

of the cable, cable weight per foot in approximate

TYPES AND SIZE DESIGNATIONS

p o u n d s , minimum radius of bend (which is

OF CABLES

approximately 8 times the overall diameter),

conductor identification, rated voltage, ampacity

Shipboard electrical cables are identified

(current-carrying capacity in amperes) of each

according to type and size. Type designations consist

conductor, and the national stock number (NSN).

of letters to indicate construction and/or use. Size

designations consist of a number or numbers to

The overall diameter is the overall measurement

indicate the size of the conductor(s) in circular mil

of the finished cable and is the determining dimension

area, number of conductors, or number of pairs of

in selecting the proper deck or bulkhead stuffing tube

conductors, depending upon the type of cable.

size or multicable transit inserts. This diameter is also

the determining dimension for stuffing tubes for

In most cases, the number of conductors in a cable,

equipment.

up to and including four conductors, is indicated by

the first type letter as follows: S--single conductor;

Electrical characteristics are given under columns

D--double conductor; T--three conductor; and

headed Rated Voltage and Ampacity.

F--four conductor. For cables with more than four

In the column headed CDR ID (conductor identifi-

conductors, the number of conductors is usually

cation), the letters stand for the identification and the

indicated by a number following the type letters. In

number stands for the method of applying the identifi-

this latter case, the letter M is used to indicate multiple

cation. There are four codes for identifying the conduc-

conductor, Examples of common shipboard cable

tors in a cable; they are STD (standard identification

designations are as follows:

code), TEL (telephone identification code), SPL (spe-

LSDSGA-3-- LOW smoke, double conductor,

cial identification code), and LTR (letter identification

shipboard, general use, armored, conductor size

code). Table 2-3 gives the standard identification color

approximately 3000 circular roils.

codes for identifying conductors in multiple-conductor

2-33