260526_Grounding_and_Bonding_for_Electrical_Systems.pdf
PDF 114 KB Posted
- Attached to
- Volusia County Branch Jail Air Handler-Fire Suppression System Removal, Replacement and Upgrade
- Solicitation number
- 26-B-110IF
- Issued by
- Volusia County, Florida
About this file
This is a specification document for Grounding and Bonding for Electrical Systems (Section 260526) issued by Volusia County for the Branch Jail facility located at 1300 Red John Drive, Daytona Beach, Florida. The specification outlines comprehensive grounding and bonding requirements for the electrical systems at the correctional facility, with a bid set date of December 5, 2025. The scope encompasses grounding of service equipment, transformers, non-current carrying conductive surfaces, metal building structures, and related equipment, all installed in accordance with the 2020 National Electrical Code and applicable local codes. The work includes installation of grounding conductors using insulated copper THHN or THWN type conductors, sectional copperclad ground rods measuring 5/8" by 10' to achieve a total length of 50 feet, and multiple connection methods including exothermic welding for below-grade connections and T&B hydraulic compression type lugs for bolted connections. The grounding electrode system shall incorporate the main underground cold-water pipe, metal building frame or structure, concrete encased electrode, fire pump control system, and rooftop lighting protection system bonded together with grounding conductors spaced a minimum of 20 feet apart to achieve a resistance to ground not exceeding 5 ohms.
The specification details execution requirements for main service grounding electrode systems at each building, feeders and branch circuits with installed grounding conductors sized per National Electrical Code Table 250, exposed non-current carrying conductive surfaces, outlet grounding with no electrical system neutral used for equipment ground, and systems grounding using #1/0 AWG insulated copper conductors in 1-inch concealed conduit connected from the building grounding electrode system to mechanical EMS control cabinets, fire alarm control panels, MDF and IDF cabinets and racks, telephone terminal boards, lighting relay panels, dimming panels, and security system cabinets. All grounding conductors shall feature total green color insulation without phase tape, and all connections below grade and to ground bars shall utilize exothermic cadweld welding methods. The specification establishes minimum standards while requiring installation that ensures freedom from dangerous shock exposure and provides low impedance ground fault paths for proper operation of overcurrent and ground fault protective devices.
View the file
Other files
Show 40 more
Latest 50 of 128 listed here. See the rest on GovTribe.
On GovTribe
Work with this file
- Download the original file
- Contacts named in this file
- Similar government files
- Ask GovTribe AI about this file
Text version
BID SET VOLUSIA COUNTY
DECEMBER 5, 2025 BRANCH JAIL
GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS 260526.00- 1
SECTION 260526 - GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS
PART 1 - GENERAL
1.1 SCOPE:
A. This section deals with the grounding of service equipment, transformers, non-current carrying conductive surfaces of equipment, metal building, structures and other equipment.
B. All grounding connections shall be installed in accordance with the 2020 National Electrical Code and all local codes and requirements. Such codes shall be considered minimum requirements and the installation of the grounding system shall insure freedom from dangerous shock exposure and shall provide a low impedance ground fault path to permit operation of overcurrent and ground fault protective devices.
PART 2 - PRODUCTS
2.1 CONDUCTORS:
A. All service and equipment grounding conductors, and bonding jumpers shall be insulated copper, type THHN, or THWN, conductors (unless noted otherwise) and shall be sized in accordance with the applicable portions of Articles 250 of the 2020 National Electrical Code. All Grounding conductors shall have a total green color insulation. Phase tape is not permitted.
2.2 GROUND RODS:
A. Ground rods shall be sectional 5/8" by 10', copperclad. All ground rods shall have a total 50'-0" length.
2.3 CONNECTIONS:
A. The Connection of a grounding conductor to ground rods shall be by Exothermic Welding.
B. Ground connections to building steel, equipment enclosures, equipment, and for all conductor’s size #3 AWG and larger shall be bolted using T & B hydraulic compression type lugs, except all connections below grade and to ground bars shall be exothermic weld type.
C. Grounding conductor connections at conduit terminations shall be made by approved grounding bushings.
PART 3 - EXECUTION
3.1 MAIN SERVICE GROUNDING ELECTRODE SYSTEM:
A. The main service grounding electrode system shall consist of the following items bonded together by the grounding electrode conductors in accordance with NEC Article 250.
1. The main underground cold-water pipe, if metal, NEC 250
2. Metal frame or structure of building where available, NEC 250
GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS 260526.00- 2
3. Concrete encased electrode, NEC 250
4. Fire Pump control system
5. Roof top Lighting Protection System where required.
B. Driven ground rods shall be spaced a minimum of 20' apart and connected parallel until resistance to ground does not exceed 5 ohms.
C. Main electrical panel at each building shall be grounded as indicated above. In addition, a grounding conductor shall be installed with the feeders and bonded to the main service grounding electrode system.
D. The neutral conductor shall be grounded at the service entrance main disconnect, and at each separately derived system only per NEC Article 250.
3.2 FEEDERS AND BRANCH CIRCUITS:
A. All feeders and branch circuits shall have installed in the same raceway as the circuit conductors, an insulated copper grounding conductor sized in accordance with Table 250 of the National Electrical Code unless such a grounding conductor is shown to be larger on the plans or specified to be larger elsewhere in these specifications.
3.3 EXPOSED NON-CURRENT CARRYING CONDUCTIVE SURFACES:
A. All exposed non/current carrying conductive surfaces of electrical equipment shall be grounded by a grounding conductor either run with the circuit conductors, and/or separate grounding conductors as shown.
3.4 OUTLET GROUNDING:
A. No electrical system neutral shall be used for an equipment ground.
B. All outlet boxes and junction boxes, lighting fixtures, convenience receptacles, switches, disconnects, etc. shall be grounded. The ground wire terminal of each convenience receptacle shall be connected to the grounding conductor. All motors, enclosures for electrical controls, all metal equipment supports for electrical controls and all similar items shall be connected to the grounding system.
C. All receptacles shall be grounded by connection to the equipment grounding conductor run with the circuit conductors. isolated grounding conductors shall connect to the equipment device, equipment ground conductor shall connect to the device box.
3.5 SYSTEMS GROUNDING:
A. A #1/0AWG insulated copper conductor installed in 1”" concealed conduit shall be connected from the building grounding electrode system to each building mechanical EMS control cabinet, Fire Alarm Control Panel (FACP), MDF and IDF cabinets and racks, telephone terminal boards, Lighting relay Panels, Dimming Panels, and security system cabinets. Terminate conductor on an appropriately sized (8) terminal multi-conductor connection grounding lug located within cabinet or on terminal boards.
GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS 260526.00- 3
B. Provide copper ground bus as indicated. All connections shall be Exothermic cadweld where accessible.
END OF SECTION 260526
| 1.1 SCOPE: |
| 2. |
| 2.1 CONDUCTORS: |
| 2.2 GROUND RODS: |
| 2.3 CONNECTIONS: |
| 3. |
| 3.1 MAIN SERVICE GROUNDING ELECTRODE SYSTEM: |
| 3.2 FEEDERS AND BRANCH CIRCUITS: |
| 3.3 EXPOSED NON-CURRENT CARRYING CONDUCTIVE SURFACES: |
| 3.4 OUTLET GROUNDING: |
| 3.5 SYSTEMS GROUNDING: |
File details come from the government source that posted it. Updated .