2.
Telephone cable WD-1( )/TT. This cable has two twisted, individually insulated conductors.
(See Figure 1-1.) The original WD-1( )/TT had separate conductors. The newer WD-1A/TT has the
same two conductors but they are bonded together. (See Figure 1-2.) The conductors have the
following characteristics:
Four tinned-copper strands and three galvanized steel strands.
Inner insulation of polyethylene and outer nylon insulation jacket (WD-1/TT
only).
Tensile strength of approximately 200 pounds (both conductors).
Weight of 48 pounds per 1.6 kilometers (1 mile).
Loss at one kilohertz at 68 degrees Fahrenheit is 2.5 decibels (dB) per 1.6
kilometers (1 mile) under wet conditions, and 1.5 dB per 1.6 kilometers (1 mile) under dry conditions.
Table 1-1. Characteristics of field wire and cable.
Common
Basic cable
Assemblies
Length
Attn(dB)
Weight
Tensile
Loading
Additional
Per milea
term
or wire
Strength
Information
(1.5 km)
In lbs
Field Wire
ED-1/TT
1/4 mile
2.5 Wet
48 lb
200
None
Inner insulation
WD-
(4 km)
1.5 Dry
per
of polyethylene
1A/TT
1/2 mile
mile
and outer nylon
(8 km)
(1.6
jacket WD-1TT
1 mile
km)
only.
(1.6 km)
Polyethylene
2 1/2
cover. Stranded
miles
conductors, 4
(4.0 km)
copper, 3 steel.
Cable, Tel
WD-36/TT
MX-6894/TT
1/4 mile
5.9 Wet
8.5 lb
25
None
Solid aluminum
(Assault
(Std A)
MX-6895
(4 km)
3.6 Dry
per
conductor # 23
Wire)
1/2 mile
mile
AWG. FSN
(8 km)
(1.6
MX-6894-3895-
km)
089-7278. FSN
MX-6895-3895-
089-7279
Wire, Tel
WF-16/U
1 mile
2.6 Wet
62 lb
200
None
Conductors are
(Four-
(LP)
(1.5 km)
2.0 Dry
per
copper-
Wire,
mile
cadmium alloy,
field Wire
(1.6
stranded.
km)
a
At 1 kHz unless otherwise indicated.
1-5
SS0440
Previous Page
