angles, a down guy installation in line with each
8-foot crossarms and angle braces for lo-foot
direction of pull is required.
crossarms to agree with REA construction. An
angle brace is also required on 8-foot arms where
6-8. Miscellaneous Items.
conductors having a breaking strength of more
a. Pole line hardware. Hardware will be of a
than 4500 pounds. Extreme loading conditions
type specifically developed for pole line installa-
may also warrant the extra cost of the stronger
tion in accordance with industry standards. All
angle brace under other circumstances. Metal cross-
steel or wrought iron hardware will be hot-dip
arm braces will reduce the effective BIL rating of
galvanized as specified in ANSI C135.1.
b. Aerial line connector hardware. Copper line
d. Riser poles. Conduits on riser poles should be
connector hardware will be of copper alloys and
aluminum line connector hardware will be of
equipped with bushings to protect cables where
aluminum or aluminum-lined alloys. Since bolted
they exit the conduit and to minimize water entry.
e. Fuse cutouts. Selection of fuse cutout duty
line connectors aggravates the cold-flow tendencies
of aluminum conductors and cause maintenance
will be based on the voltage of the circuit and the
problems, other types of connections such as com-
continuous and interrupting current ratings neces-
pression type will be used.
sary for equipment or feeder protection. Ratings
c. Crossarms. Laminated wood, synthetic mate-
for fuses, fuse cutouts, and fuse links will comply
rials, and channel iron brackets are occasionally
with IEEE Stds C37.42, C37.46, and C37.47. En-
closed fuse cutouts are available only for 5.2 kV
used for equipment crossarm type supports; how-
ever, it is only for unusual installations that the
and 7.8 kV ratings, but not for ultra heavy duty
use of anything other than solid wood crossarms
applications. Open fuse cutouts are available for
can be justified. Flat braces will be specified for
ratings of 7.8 kV and higher.
US Army Corps of Engineers
Figure 6-8. Types of Guy Installations