messenger. Clevis attachments shall be provided with not less than 15.9 mm
5/8 inch through-bolts. Secondary racks may be used when installed on wood
poles and where the span length does not exceed 61 m 200 feet. Secondary
racks shall be two-, three-, or four-wire, complete with spool insulators.
Racks shall meet strength and deflection requirements for heavy-duty steel
racks, and shall be either galvanized steel or aluminum alloy. Tops of
insulator saddles shall be rounded and smooth to avoid damage to conductor
insulation. Each insulator shall be held in place with a 15.9 mm 5/8 inch
button-head bolt equipped with a nonferrous cotter pin, or equivalent, at
the bottom. Racks for dead-ending four No. 4/0 AWG or four larger
conductors shall be attached to poles with three 15.9 mm 5/8 inch
through-bolts. Other secondary racks shall be attached to poles with at
least two 15.9 mm 5/8 inch through-bolts. Minimum vertical spacing between
conductors shall not be less than 200 mm 8 inches.
3.6
TRANSFORMER INSTALLATION
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NOTE: Specify phase sequence in accordance with the
local practice.
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Transformers shall be carefully installed so as not to scratch finishes or
damage bushings. Transformers shall be installed in accordance with the
manufacturer's instructions. After installation, surfaces shall be
inspected and scratches shall be touched up with a finish provided by the
transformer manufacturer for this purpose. Three-phase transformer
installations shall be installed with [_____] phase sequence. Primary taps
shall be set at [_____].
3.7
CONNECTIONS TO UTILITY LINES
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NOTE: This paragraph will be further developed to
suit the conditions of any connections required to
the serving utility's lines.
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The Contractor shall coordinate the work with the Contracting Officer and
shall provide for final connections to the [utility] [installation]
electric lines.
3.8
CONNECTIONS BETWEEN AERIAL AND UNDERGROUND SYSTEMS
Connections between aerial and underground systems shall be made as shown.
Underground cables shall be extended up poles in [guards] [conduit] to
cable terminations. Conduits shall be secured to poles by [conduit
supports] [two-hole galvanized steel pipe straps] spaced not more than 3 m
10 feet apart and with one support not more than 300 mm 12 inches from any
bend or termination. Cables shall be supported by devices separate from
the conduit or guard, near their point of exit from the riser conduit or
guard. Cables guards shall be secured in accordance with the manufacturers
published procedure. Risers shall be equipped with bushings to protect
cables. Capnut potheads shall be used to terminate medium-voltage
multiple-conductor cable.
SECTION 16370A
Page 38
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