28-Section 160526 - Grounding and Bonding for Electrical Systems - 08182026.pdf
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- Attached to
- Removal and Replacement of Telemetry Cabinets for Existing SCADA System - Phased Projects
- Solicitation number
- ITB No.: 27-402/DL
- Issued by
- Palm Beach County, Florida
About this file
This is a specification section for grounding and bonding of electrical systems associated with an ITB (Invitation to Bid) for the removal and replacement of telemetry cabinets for an existing SCADA system in Florida. The project involves the replacement of thirty-three (33) telemetry cabinets through a series of phased projects and will be contracted to a licensed Florida General or Electrical Contractor. The contractor must furnish all labor, materials, equipment, and incidentals required to complete the work as detailed in the contract documents. The initial contract period is three (3) years with an option to renew for an additional one (1) year at the Authority's sole discretion. Bidders must submit responses electronically through Bonfire by the specified deadline and provide bid security in the form of a surety company bid bond or cashier's check in an amount not less than five percent (5%) of the total bid amount.
The specification section 160526 establishes requirements for grounding system installation in accordance with Article 250 of the National Electric Code, including the use of copper-clad steel ground rods (5/8-inch diameter, minimum 20 feet in length), proper installation techniques for all equipment enclosures and exposed connections, and protection of grounding conductors against mechanical injury. The contractor is required to perform ground resistance testing (not within 48 hours of rainfall) and grounding system continuity checks using a low-range ohmmeter, with results submitted to the engineer for approval. All testing equipment must be contractor-provided and approved by the engineer, and dry season resistance must comply with NEC guidelines. No specific pricing information, incumbent contractor details, or dedicated set-asides are identified in this specification section.
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Text version
ITB No.: 27-402/DL Removal & Replacement of Telemetry Cabinets for 160526 -1 Existing SCADA Systems – Phased Projects
SECTION 160526
GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS
PART 1 - GENERAL
1.01 SCOPE OF WORK
A. Furnish and install a complete grounding system in strict accordance with Article 250 of the National Electric Code and as hereinafter specified and shown in the Drawings.
PART 2 - PRODUCTS
2.01 GROUND RODS
A. Ground rods shall be copper-clad steel, 5/8-inch diameter, with a minimum length of 20 feet. Ground rods shall be copper-weld or an approved equal product.
PART 3 - EXECUTION
3.01 INSTALLATION
A. CONTRACTOR shall not allow any grounding connections to be painted. If the connections are painted, they shall be disassembled and remade with new fittings.
B. Grounding electrodes shall be driven as required. Where rock is encountered, grounding plates may be used in lieu of grounding rods.
C. All equipment enclosures, motor frames, conduit systems, exposed structural steel, and similar items shall be grounded.
D. Exposed connections shall be made by means of approved grounding clamps. Exposed connections between different metals shall be sealed with No-Oxide Paint Grade A or approved equal. All buried connections shall be made by welding process equal to Cadweld.
E. All grounding conductors shall be laid slack. Grounding conductors exposed to mechanical injury shall be protected by pipes or other substantial guards. If guards are made of iron pipes or other magnetic materials, conductors shall be electrically connected to both ends of the guard.
ITB No.: 27-402/DL Removal & Replacement of Telemetry Cabinets for 160526 -2 Existing SCADA Systems – Phased Projects
F. The CONTRACTOR shall exercise care to ensure good ground continuity, in particular between the conduit system and equipment frames and enclosures. Where necessary, jumper wires shall be installed.
3.02 TESTS
A. The CONTRACTOR shall test the ground resistance of the system. Testing shall not be performed within 48 hours of rainfall. All test equipment shall be provided by the CONTRACTOR and approved by the ENGINEER. Dry season resistance of the system shall not exceed NEC guidelines.
Submit test results to the ENGINEER for approval.
B. All grounding system continuity shall be checked with a low-range ohmmeter.
END OF SECTION
| 1.01 SCOPE OF WORK |
| 2.01 GROUND RODS |
| 3.01 INSTALLATION |
| 3.02 TESTS |
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