844EMERGENCY PREEMPTION DETECTOR

DE · 2026 Standard Specifications✓ Full text on BuildSpecBook pages 538–0 Save this section

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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.

844.4Method 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 provided, assembled, installed, and accepted at the contract unit price. 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 EA

Referenced in this section

832ELECTRIC AND ITMS CABLE AND SPLICING

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Source: Delaware Standard Specifications for Road and Bridge Construction, 2026 Edition. Pages 538–0 of 786. View official source ↗

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