Field wire line tests normally originate from terminal equipment. In
most cases, fault-detection tests are completed at this point along with
reasonably accurate fault location.
Lines entering terminal equipment are connected to the equipment line
When a working line is reported in trouble, the lineman
makes an operational test to determine if the fault is inward toward the
operating equipment, or outward toward the local line.
The lineman would report to the terminal equipment to determine which
is the faulty line and to ensure he has the correct line reported with fault
(Chapter 11, FM 24-20).
NEVER OPEN A CIRCUIT THAT IS IN USE.
Connect wire line to test telephone for
testing to verify
(paragraph 2-3d, TM 11-5805-20-12).
a. The lineman should depress the line binding post on the terminal
equipment and remove ends of wire from the equipment.
b. Place the test telephone on a level surface and pull the zipper to
open telephone carry case.
c. Push down on one of the line binding posts on test telephone and
insert the bare end of one wire into the binding post slot.
d. Release the post and check to see that the wire is securely clamped.
e. Connect the other wire to the other binding post as in 6c-d above.
Learning Event 2:
TEST WIRE TO VERIFY CIRCUIT TROUBLE.
The basic kinds of faults that occur on all kinds of wire lines are
open circuits, short circuits, crossed circuits, and grounded circuits.
When wire lines are reported unserviceable, lines have to be tested to
verify the kind of faults reported.
To test wire line, each end of wire line must be connected to the test
telephone (paragraph 2-3d, TM 11-5805-201-12).
An open occurs in a wiring line when one or both conductors are broken
or cut (Chapter 11, FM 24-20).
An intermittent open also occurs in poor