MIL-HDBK-1025/10
possible interference with public traffic of any type. Where it is necessary to block traffic
temporarily while wires and guys are being installed, one or more members of the crew should be
assigned to direct traffic.
7.10.5.1 Stringing Primary Line Wires. Stringing by facility personnel will normally be
done by the tension method, since this keeps the conductor clear of energized conductors and
clear of obstacles that might cause surface damage to the wire. Slack stringing may be
appropriate for new short line extensions. In either case lines should be sagged to meet the
requirements of the NESC.
a. In stringing wires, care should be taken not to put kinks into any part of the line. Kinks
reduce the strength of the wire and may result in fallen wires later.
b. Before changing the strains on a pole by adding wires, engineering guidance should be
requested to ensure that the pole will safely stand the altered strain.
7.10.5.2 Clipping in or Tying Primary Line Wires. This involves the transferring of
sagged conductors from their stringing travelers to their permanent insulator positions where they
may either be clamped or tied to insulators.
a. Wires should be securely tied-in at all tie-in type insulators to prevent the possibility of
wires becoming loose at points of support and falling to the ground. Where double arms are
provided, line wires should be well tied-in to insulators on each arm. This applies to pin- and
post-type tie-top insulator work. Clamp-type insulators should have the clamps tightened to meet
the manufacturer's requirements.
b. When it is necessary to connect two parallel circuits at one or more points on the line,
the phase wires should be tested with a potential transformer or other means, to make sure that
the phase wires of one circuit are being connected to the corresponding phase wires of the other
circuit.
c. Care should be taken to see that phase wires are not crossed when turning the vertical
angle on three-phase lines, that is, phase wires should take the same position leaving an angle as
coming into it.
7.10.6 Secondary Line Installation. Secondary lines should be installed to meet line
clearance requirements of the NESC. Lines may be single or triplexed wires. Secondary lines
with insulation should be handled with the care insulated wire requires. Workers should be
particularly careful in stringing secondary services, to avoid any undue hazard in close proximity
to primary lines. Locations where the service wires might fall across conductors of a higher
voltage are not permitted.
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