2010 Construction and Material Specifications - Ohio Department of ...

632.18
through-bolts and 3-inch (75 mm) washers. Securely attach and protect ground
wire furnished as part of another work item with a wood or plastic molding for a
minimum distance of 10 feet (3 m) above groundline.
632.18 Down Guy Assembly. Install and tension guy assemblies before
erecting signals such that they will resist the major portion of the horizontal
loading caused by loading of the messenger wire.
632.19 Pedestal. Furnish pedestals for the support of traffic control equipment
with a cast or plate steel base, unless a transformer type base is specified.
632.20 Conduit Riser. Attach risers to poles to provide a wiring raceway and
include a weatherhead, conduit, necessary fittings, and pole attached clamps.
Attach risers to poles by clamps spaced at intervals not exceeding 5 feet (1.5 m).
Paint conduit risers mounted on painted poles to match the poles.
632.21 Cable Support Assembly. Use cable support assemblies to eliminate
strain on cables, or groups of cables up to a maximum of four, entering the interior
of poles through a weatherhead or mast arm. If required, include a length of
messenger wire forming a sling with ends formed of lapped wire, thimbles, and
clamps as part of the assembly.
632.22 Messenger Wire. Arrange messenger wire with accessories between
two or more poles to provide support and attachment for traffic control equipment.
Accessories used with messenger wire include bullrings, thimbles, preformed guy
grip dead ends, and three bolt clamps. Furnish bullrings at messenger wire
network corners. Use thimbles to attach messenger wire to the shackles of strain
pole clamps and bullrings.
Adjust the length of the messenger wire under the load of traffic control
equipment so the sag at the lowest point is not greater than 5 percent or less than 3
percent of the span. Attach signal cable to messenger wire with lengths of
preformed helical lashing rod that are of a proper internal diameter to tightly
secure the cable to the messenger wire. Attach interconnect cable with preformed
lashing rod or spinning wire.
632.225 Tether Wire. Arrange tether wire with accessories to stabilize signal
heads and prevent excessive swinging. Accessories included with tether wire
include anchor shackles, S-hooks yielding element, thimbles, turnbuckles, guy
grips, wire rope clips, lock wire, safety tie wire, lead sheet, and signal head tether
anchors and extenders.
Adjust the tether span to be horizontal on simple spans. On complex spans, the
tether span shall be essentially parallel to the overlying messenger span. Bull
Rings will be used at all internal corners of the tether span. Safety ties shall be
installed at all yielding (S-hook) locations to prevent the span end from dropping
into the roadway if the S-hook opens. No electrical or communication cables of
any kind shall be attached to the tether wire. No signs or other devices shall be
suspended from or attached to the tether wire.
632.23 Cable and Wire. Fashion cable at traffic signal equipment
weatherhead entrance fittings into a drip loop that extends at least 6 inches (150
mm) below the entrance. Do not allow the cable to chafe on the equipment.
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