Learning Event 2: Splice Wire Line

Testing Wire Lines and Locating Faults
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To simplify and speed up testing when the line is faulty: One of the

lineman, who installed the line, should be familiar with the route and can

inspect the line and locate the trouble more rapidly than the other.

To localize trouble by testing wire is as follows:

a. The wireman will proceed to the first splice from the

nearest

terminal equipment and untape the splice (Chapter 11, FM 24-20).

b. Depress the line binding post on test telephone and insert bare wire

(paragraph 2-3c, TM 11-5805-201-12).

c. Release line binding posts and turn handcrank rapidly.

Pick up

handset and when operator answers, determine what side is good.

d. Disconnect wire from test telephone and retape splice.

If wireman did not receive answer from distant end, he will proceed to

halfway along the wire section that has the fault (Chapter 11, FM 24-20).

a. Wireman will cut the wire or remove tape if a splice exists there

and connect wire to test telephone.

b. Test wire in both directions to locate which side contains the

fault.

c. When testing is complete in that area, disconnect wire from

telephone and repeat testing procedures until fault is narrowed down to the

section that you know contains the fault.

Retape or splice each opening made in the wire line.

Learning Event 2:

SPLICE WIRE LINE.

Splicing is used to join the conductors if field wire line is to

maintain electrical continuity.

A splice should have the same tensile

strength, conductivity, abrasion and weather protection and insulation

resistance as the unspliced portion of the wire.

A bad splice causes

transmission loss, noise, and impairs the circuit quality.