resistance is not met, additional electrodes shall be provided,
[interconnected with grounding conductors] [as indicated], to achieve the
specified ground resistance. The additional electrodes shall be [up to
three [[2.4] [3] m [8] [10] feet] long rods spaced a minimum of 3 m 10 feet
apart] [a single extension type rod, [[15.9] [19.1] mm [5/8] [3/4] inch] in
diameter, up to 9.1 m 30 feet long [driven perpendicular to grade] [coupled
and driven with the first rod]]. In high ground resistance, UL listed
chemically charged ground rods may be used. If the resultant resistance
exceeds 25 ohms measured not less than 48 hours after rainfall, the
Contracting Officer shall be notified immediately.
3.5
AERIAL CABLE SPLICES
Splices in aerial cable shall be within 900 mm 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 300 mm 12
inches of the enclosure.
3.6
LASHING WIRE
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 one turn per 355.6 linear mm 14 linear inches and not less than
the number of turns per linear meter foot that is recommended by the cable
manufacturer for the distance between cable support points and the combined
ice and wind loading and extreme wind loading shown or normally encountered
for the installed location. Lashing clamps shall be placed at all poles
and splices.
3.7
STRESS LOOPS
Loops shall be formed in the aerial cable at all points of connection and
at all poles to prevent damage from thermal stress and wind loading.
Aerial cable shall be protected from chafing and physical damage with the
use of spiral cut tubing and PVC tape, or plastic sleeves.
3.8
CONNECTIONS TO BUILDINGS
**************************************************************************
NOTE: Where this guide specification is used for
installation of a security and CCTV lighting system
in an existing facility, the designer will delete
the reference to Section 16402 INTERIOR DISTRIBUTION
SYSTEM and incorporate pertinent paragraphs from the
referenced guide specification.
**************************************************************************
Cables shall be extended into the various buildings as indicated and shall
be properly connected to the indicated equipment. Empty conduits to the
indicated equipment from a point 1.5 m 5 feet outside the building wall and
600 mm 2 feet below finished grade [are specified in Section 16402 INTERIOR
DISTRIBUTION SYSTEM] [shall be provided]. After installation of cables,
conduits shall be sealed to prevent moisture or gases from entering the
building.
SECTION 16528A
Page 35
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