NOTE: Aerial cable should be installed on existing
poles. Where this is not possible, requirements
must be shown on drawings.
Designer must coordinate with facility personnel for
ground clearance and establish clearances to be
shown on drawings.
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Except as otherwise specified, aerial electrical work shall be installed as
specified in Section 16370A ELECTRICAL DISTRIBUTION SYSTEM, AERIAL and as
shown.
a.
A messenger cable system to support aerial cable shall be
furnished. The messenger system, including appurtenances, guys
and hardware, shall be capable of withstanding a minimum of 20 kN
4500 pounds of tension.
b.
Transitions from aerial cable to underground cable shall be as
specified for CONNECTIONS BETWEEN AERIAL AND UNDERGROUND SYSTEMS
in Section 16370A ELECTRICAL DISTRIBUTION SYSTEM, AERIAL.
c.
Splices in aerial cable shall be within 1 meter 3 feet of a pole
and placed inside a watertight enclosure. Drip loops shall be
formed at the cable entrance to the enclosure. Lashing clamps
shall be placed within 305 mm 12 inches of the enclosure.
d.
Lashing wire shall be wound tightly around both the communication
cable and the messenger cable by machine methods. The lashing
wire shall have a minimum of 3 turns per 305 mm linear foot.
Lashing clamps shall be placed at all poles and splices.
e.
Loops shall be formed in the aerial cable at points of connection
and at poles to prevent damage from thermal stress and wind
loading. The communication cable shall be protected from chafing
and physical damage with the use of spiral cut tubing and PVC
tape, or plastic sleeves. The ground clearance of installed
cabling shall be as shown.
3.1.5
Radio Control Switch (RCS)
Install RCS per manufacturer's guide and seal penetrations with rubber
silicone sealant to preclude the entry of water.
3.1.6
Impulse Suppression Surge Arrester Grounding
Impulse suppression surge arresters shall be grounded. Ground resistance
shall be not more than 10 ohms. Connections to earth shall be made in the
same manner as for secondary neutral ground rod. The aerial portions of
surge arrester and secondary neutral ground conductors shall be separate
from and independent of each other but both grounds shall be bonded
together below grade at the ground rods, or to the ground counterpoise, as
applicable and the ground rods shall be spaced a minimum of 6.1 meters 20
feet apart.
SECTION 16797A
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