DelDOT Standard Specifications Section 833: Grounding

833.1Description.

This work consists of providing and placing electrical grounding equipment.

833.2Materials.

A.Stainless Steel Hardware Section 1039

B.Ground Rods

1.Underwriters Laboratories Approved.

2.3/4-inch Diameter.

3.10-feet long, Minimum, Unless Otherwise Specified.

4.Copper-Clad Steel.

5.Approved Clamps for Connecting the Grounding Conductor to the Ground Rod.

833.3Construction.

Provide certified test reports verifying the ground resistance of each ground or ground grid when installed. 833.3.1 Ground Rods.

A.Provide and place ground rods with a minimum 3/4-inch diameter and 8-feet of embedment into

undisturbed soil at the locations indicated in the contract. Measure the ground resistance of each rod before connecting the rod to the grounding conductor. Ensure that, if the measured resistance exceeds 25-ohms, in accordance with the National Electric Code, exothermically weld a 10-foot extension to the top of the first rod and drive to its full depth. Measure the earth resistance again. Contact the engineer for direction if the measured resistance still exceeds 25- ohms. Exot he rmically weld the ground rod and joining ground wire after successful testing. Paint the weld and exposed cable with 2 coats of insulating varnish.

B.The engineer may direct the use of a grounding grid where rock is encountered, and the

contractor cannot achieve an acceptable earth ground by driving as described above. Exothermically weld direct buried rods end-to-end to bond lighting standards and structures in a continuous series to a point where the contractor can obtain an acceptable ground.

C.Maintain continuity of the equipment grounding system throughout the project. Make

connections to equipment grounding systems using suitable lugs at all grounding bushings specified, and at the ground lugs in lighting or traffic signal structure access holes or in a breakaway base. Make connections to ground rods in accordance with the contract. Make connections to neutral grounding systems using grounding lugs. 833.3.2 Bonding and Grounding Junction Well. Drill holes in the junction well cover and the junction well frame. Attach a braided bonding strap to both the cover and frame in accordance with the contract to ensure proper bonding. Bond the junction well frame to the existing ground wire in the junction well, using a compression connector such as a C-tap.

833.4Method of Measurement.

A.The Department will measure the number of 10-foot long lengths of ground rods as the number of

ground rods provided, placed, and accepted. The Department will only measure ground rods separately that are replacements or are added as singular items. The Department will not measure ground rods installed in conjunction with pole bases, cabinet bases, or metered service pedestals as the ground rods are incidental to these items.

B.The Department will measure the number of existing junction wells grounded and bonded. The

Department will not measure grounding and bonding of new junction wells as grounding and bonding are incidental to the applicable junction well pay item.

833.5Basis of Payment.

A.The Department will pay for the items at the contract unit price per each. Price and payment

constitute full compensation for providing and placing all materials. ITEM DESCRIPTION UNIT 833001 BONDING AND GROUNDING EXISTING JUNCTION WELL EA 833002 PROVIDE AND INSTALL GROUND ROD EA

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Source: Delaware Standard Specifications for Road and Bridge Construction, 2026 Edition. Pages 502–0 of 786. View official source ↗

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832 ELECTRIC AND ITMS CABLE AND SPLICING

834 POLE BASES, EXTENSIONS, AND SHEETING

833GROUNDING

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