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Electrical (16000-16999)

843001 ELECTRICAL TESTING LS

DE · 2025 Standard SpecificationsBook pages 537–539View official source ↗

EMERGENCY PREEMPTION DETECTOR SECTION 844

527 SECTION 844 — EMERGENCY PREEMPTION DETECTOR

844.1Description.

This work consists of providing, assembling, wiring, and installing emergency preemption detectors on a mast arm or span wire.

844.2Materials.

A.Detector Cable. Section 832.

B.Emergency Preemption Detector – Opticom Model 721 and Associated Hardware or Approved

Equal.

C.Teflon Tape.

D.Waterproof 3/4 -inch Wide Vinyl Plastic Tape from the Following Manufacturers:

1.3M Company Cat. No. 33.

2.Plymouth Rubber Cat. No. 3117.

3.Permacel Cat. No. P29.

4.Approved equal.

5.Colors needed:

a.Violet

b.Red

c.Green

d.Yellow

e.Blue

844.3Construction.

A.Assemble mounting hardware in accordance with the contract. Use thread sealing tape on the

mounting hardware.

B.Drill a 1/8 -inch diameter weep hole on the bottom of the detector. Install the emergency

preemption detector in accordance with the contract. Attach the 4 -conductor detector cable to the 4 terminal screws within the emergency preemption detector unit, in accordance with the manufacturer’s specifications.

C.Identify the detector cable home run within the control cabinet by a violet band and a band of a

different color to denote the direction of the detector as follows:

1.RED – northbound eye

2.GREEN – eastbound eye

3.YELLOW – southbound eye

4.BLUE – westbound eye

D.Dispose of removed emergency preemption detectors in accordance with the contract.

EMERGENCY PREEMPTION DETECTOR SECTION 844

528 844.4 Method of Measurement. The Department will measure the quantity of emergency preemption detector installations as the number provided, assembled, and installed on span wire or traffic signal mast arms, and accepted.

844.5Basis of Payment.

The Department will pay for emergency preemption detectors at the contract unit price per each. Price and payment constitute full compensation for providing, assembling, and installing the emergency preemption detectors and removing and delivering replaced units and hardware to the Department. ITEM DECRIPTION UNIT 844001 PROVIDE AND INSTALL OPTICOM EMERGENCY PREEMPTION DETECTOR EACH LOOP DETECTOR SECTION 846

529 SECTION 846 — LOOP DETECTOR

846.1Description.

This work consists of providing and placing loop detectors.

846.2Materials.

B.Backer Rod, Closed Cell Section 1043

C.Conduit, Galvanized Section 1062

D.Loop Detector Section 1079

E.Tape Section 1074 .2.F

F.Heat Shrink Tubing Section 1074 .2.G.1

G.Loop Wire Section 1079.1

H.Home Run Cable Section 1074 .1.D

I.Backer Rod – 5/8-inch closed cell foam. Section 1043

J.Junction Well Splices Section 1074 .2.G

K.Splicing Kit Section 1074.2.G .3

L.PCC Patching Section 1023

M.Asphalt Production Section 1014

N.Joint Sealant Section 1042.1.B

846.3Construction.

846.3.1 Loop Wire Installation.

A.Sawcut a groove in the pavement 5/8 -inch wide and at least 3 1/2 -inches deep in accordance with

compressed air to remove loose material before sealing.

B.Install the loop detector wire using blunt tools to prevent damage to the polyethylene outer

cover.

C.Tag 1 end of a loop detector wire to indicate start with an “S.”

D.Place a 5/8 -inch backer rod on top of the wire in the saw cut as needed to secure the wire within

the saw cut.

E.The engineer may require a high voltage ground test with a 500 volts DC megger after completion

of the loop detector installation and before sealing saw cuts. If the resistance to ground is less than 100 megaohms, remedy the work.

F.Apply a sealer, and sealer accelerant or retarder, if necessary, in the saw cut, in accordance with

the manufacturer’s directions. Protect the saw cut area from traffic until the sealer has set. Place a minimum of 1 inch of sealer on top of the loop detector wire and finish flush with the pavement. Seal any drilled holes in the pavement.

G.Install 2 loop detector wires in a saw cut from the loop to the edge of the road. Extend these 2

wires from the end of the saw cut to a junction well. Twist the wires a minimum of 5 wraps per

Source: Delaware Standard Specifications for Road and Bridge Construction, 2025 Edition. Pages 537–539 of 779.

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