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Section 49 – Signals, Lighting and Electrical Systems

Prior to actual turn-on time, the Contractor shall uncover all Agency-installed signs that have

been installed prior to signal turn-on and are covered. Turn-ons shall take place between 11:00

a.m. and 2:00 p.m., Monday through Thursday. No signal turn-on shall be scheduled for the

day before a holiday. No two-signal turn-ons on the same Contract shall be scheduled for the

same day. All work done by the Contractor to accomplish these objectives is included in the

price paid for the intersection, and no additional compensation will be allowed.

49-2 MATERIALS AND INSTALLATION

49-2.01 Trench Excavation and Backfill

Unless otherwise shown or specified in the Contract, trench excavation and backfill shall

conform to Section 19, “Trench Excavation, Bedding, and Backfill”, of these Specifications, and

restoration of surfaces shall conform to Section 14, “Restoration of Surfaces”, of these

Specifications. Trenching for signals, lighting and electrical systems may be made by earth saw

trenching in accordance with the provision of Section 49-2.02, “Earth Saw Trenching”, in this

Section of these Specifications.

Unless otherwise permitted in writing by the Agency, all surplus excavated material shall be

removed and disposed of the same day the surplus material is excavated.

The Contractor must contact Underground Service Alert a minimum of forty-eight (48) hours

before any excavation work begins. The Contractor shall outline the excavation area in white.

49-2.02 Earth Saw Trenching

Trenching for signals, lighting, and electrical systems may be made by earth saw trenching.

Trenches to be made by this method shall be cut by a machine that will produce smooth edge

cuts in the pavement and will move at a speed in excess of four feet (4’) per minute while cutting

pavement. The trenching machine shall be shielded to prevent loose material from being

thrown away from the machine.

The minimum trench depth shall be that which is necessary to provide for nine inches (9”)

minimum cover between the top of the conduit and the finished pavement grade and extend

through the pavement structural section. The trench section shall conform to Standard Drawing

Loose material deposited on the pavement behind the cutting machine shall be removed

from the pavement immediately and the pavement cleared to allow the passage of traffic. Only

those traffic lanes occupied by the cutting machine and the cleanup operation shall be closed

and they shall be opened as soon as the work has moved sufficiently to clear them.

The conduit shall be placed in the bottom of the trench and the trench shall be backfilled

with portland cement concrete to match the existing pavement surface within areas that are to

receive an asphalt concrete overlay as part of the same contract, and to within one inch (1”) of

the pavement surface of existing pavements that are not to receive an asphalt concrete overlay

as part of the same contract.

The concrete shall be Class “C” concrete conforming to Section 50-5, “Portland Cement

Concrete”, of these Specifications, with one-inch (1”) maximum size aggregate and one-inch

(1”) slump, and shall contain calcium chloride in an amount not to exceed three percent (3%) of

the cement content. For electrical work, concrete shall be Class “B” concrete conforming to