26 05 26 - Grounding and Bonding for Electrical Systems.docx
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- Solicitation number
- 36C25621R0127
About this file
This solicitation package includes a request for proposals (RFP) for replacing refrigerators and freezers at a Veterans Affairs medical center. The Overton Brooks VA Medical Center is seeking to replace refrigerators and freezers in its Nutrition and Food Service and Pharmacy departments under Project 667-21-101. The RFP will be issued on or around June 7, 2021, with proposals due approximately 30 days later on July 7, 2021. The anticipated contract award date is approximately 30 days after receipt of proposals. The contract performance period is 180 calendar days from notice to proceed. The work location is the Overton Brooks VA Medical Center in Shreveport, Louisiana. Offerors must be verified as service-disabled veteran-owned small businesses and registered in the Vendor Information Pages and System for Award Management databases. The North American Industry Classification System code for this work is 236220 and the small business size standard is $39.5 million. The construction cost range is between $500,000 and $1 million.
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Text version
SECTION 26 05 26
GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS
PART 1 - GENERAL
1.1 DESCRIPTION
A. This section specifies the furnishing, installation, connection, and testing of grounding and bonding equipment, indicated as grounding equipment in this section. The grounding electrode system is existing. Work in this project is limited to extending the existing grounding system to newly installed equipment.
B. “Grounding electrode system” refers to grounding electrode conductors and all electrodes required or allowed by NEC, as well as made, supplementary, and lightning protection system grounding electrodes. The grounding electrode system is existing and will not be modified by work in this project.
C. The terms “connect” and “bond” are used interchangeably in this section and have the same meaning.
1.2 RELATED WORK
A. Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS: Requirements that apply to all sections of Division 26.
B. Section 26 05 19, LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES: Low-voltage conductors.
C. Section 26 05 33, RACEWAY AND BOXES FOR ELECTRICAL SYSTEMS: Conduit and boxes.
1.3 QUALITY ASSURANCE
A. Quality Assurance shall be in accordance with Paragraph, QUALIFICATIONS (PRODUCTS AND SERVICES) in Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS.
1.4 SUBMITTALS
A. Submit in accordance with Paragraph, SUBMITTALS in Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS, and the following requirements:
1. Shop Drawings:
a. Submit sufficient information to demonstrate compliance with drawings and specifications.
b. Submit plans showing the location of system grounding electrodes and connections, and the routing of aboveground and underground grounding electrode conductors.
PROJECT 667-21-101 REPLACE NFS & PHARMACY
REFRIGERATORS AND FREEZERS
VETERANS ADMINISTRATION, SHREVEPORT, LA
01-01-17
26 05 26 -
GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS
2. Test Reports:
a. Two weeks prior to the final inspection, submit ground resistance field test reports to the COTR.
3. Certifications:
a. Certification by the Contractor that the grounding equipment has been properly installed and tested.
1.5 APPLICABLE PUBLICATIONS
A. Publications listed below (including amendments, addenda, revisions, supplements, and errata) form a part of this specification to the extent referenced. Publications are referenced in the text by designation only.
B. American Society for Testing and Materials (ASTM):
B1-13...................Standard Specification for Hard-Drawn Copper Wire B3-13...................Standard Specification for Soft or Annealed Copper Wire B8-11...................Standard Specification for Concentric-Lay- Stranded Copper Conductors, Hard, Medium-Hard, or Soft C. Institute of Electrical and Electronics Engineers, Inc. (IEEE):
81-12...................IEEE Guide for Measuring Earth Resistivity, Ground Impedance, and Earth Surface Potentials of a Ground System Part 1: Normal Measurements D. National Fire Protection Association (NFPA):
70-17...................National Electrical Code (NEC) 70E-15..................National Electrical Safety Code 99-15...................Health Care Facilities E. Underwriters Laboratories, Inc. (UL):
44-14...................Thermoset-Insulated Wires and Cables 83-14...................Thermoplastic-Insulated Wires and Cables 467-13..................Grounding and Bonding Equipment
PART 2 - PRODUCTS
2.1 GROUNDING AND BONDING CONDUCTORS
A. Equipment grounding conductors shall be insulated stranded copper, except that sizes No. 10 AWG and smaller shall be solid copper. Insulation color shall be continuous green for all equipment grounding conductors, except that wire sizes No. 4 AWG and larger shall be identified per NEC.
B. Bonding conductors shall be bare stranded copper, except that sizes No.
10 AWG and smaller shall be bare solid copper. Bonding conductors shall be stranded for final connection to motors, transformers, and vibrating equipment.
C. Conductor sizes shall not be less than shown on the drawings, or not less than required by the NEC, whichever is greater.
D. Insulation: THHN-THWN and XHHW-2. XHHW-2 shall be used for isolated power systems.
2.2 GROUND CONNECTIONS
A. Above Grade:
| 1. Bonding Jumpers: Listed for use with aluminum and copper conductors. For wire sizes No. 8 AWG and larger, use compression-type connectors. | For wire sizes smaller than No. 8 AWG, use mechanical type lugs. | Connectors or lugs shall use zinc-plated steel bolts, nuts, and washers. Bolts shall be torqued to the values recommended by the manufacturer. | |
| 3. Connection to Grounding Bus Bars: Listed for use with aluminum and copper conductors. | Use mechanical type lugs, with zinc-plated steel bolts, nuts, and washers. Bolts shall be torqued to the values recommended by the manufacturer. |
PART 3 - EXECUTION
3.1 GENERAL
A. Installation shall be in accordance with the NEC, as shown on the drawings, and manufacturer’s instructions.
B. Equipment Grounding: Metallic piping, building structural steel, electrical enclosures, raceways, junction boxes, outlet boxes, cabinets, machine frames, and other conductive items in close proximity with electrical circuits, shall be bonded and grounded.
3.2 INACCESSIBLE GROUNDING CONNECTIONS
A. Make grounding connections, which are normally buried or otherwise inaccessible, by exothermic weld.
3.3 SECONDARY VOLTAGE EQUIPMENT AND CIRCUITS
A. Metallic Piping, Building Structural Steel, and Supplemental Electrode(s):
1. Provide a grounding electrode conductor sized per NEC between the service equipment ground bus and all metallic water pipe systems, building structural steel, and supplemental or made electrodes. Provide jumpers across insulating joints in the metallic piping.
3.4 RACEWAY
A. Conduit Systems:
1. Ground all metallic conduit systems. All metallic conduit systems shall contain an equipment grounding conductor.
2. Non-metallic conduit systems, except non-metallic feeder conduits that carry a grounded conductor from exterior transformers to interior or building-mounted service entrance equipment, shall contain an equipment grounding conductor.
3. Metallic conduit that only contains a grounding conductor, and is provided for its mechanical protection, shall be bonded to that conductor at the entrance and exit from the conduit.
4. Metallic conduits which terminate without mechanical connection to an electrical equipment housing by means of locknut and bushings or adapters, shall be provided with grounding bushings. Connect bushings with an equipment grounding conductor to the equipment ground bus.
B. Feeders and Branch Circuits: Install equipment grounding conductors with all feeders, and power and lighting branch circuits.
C. Boxes, Cabinets, Enclosures, and Panelboards:
1. Bond the equipment grounding conductor to each pullbox, junction box, outlet box, device box, cabinets, and other enclosures through which the conductor passes (except for special grounding systems for intensive care units and other critical units shown).
2. Provide lugs in each box and enclosure for equipment grounding conductor termination.
D. Wireway Systems:
1. Bond the metallic structures of wireway to provide electrical continuity throughout the wireway system, by connecting a No. 6 AWG bonding jumper at all intermediate metallic enclosures and across all section junctions.
2. Install insulated No. 6 AWG bonding jumpers between the wireway system, bonded as required above, and the closest building ground at each end and approximately every 16 M (50 feet).
3. Use insulated No. 6 AWG bonding jumpers to ground or bond metallic wireway at each end for all intermediate metallic enclosures and across all section junctions.
4. Use insulated No. 6 AWG bonding jumpers to ground cable tray to column-mounted building ground plates (pads) at each end and approximately every 15 M (49 feet).
E. Receptacles shall not be grounded through their mounting screws. Ground receptacles with a jumper from the receptacle green ground terminal to the device box ground screw and a jumper to the branch circuit equipment grounding conductor.
F. Ground lighting fixtures to the equipment grounding conductor of the wiring system. Fixtures connected with flexible conduit shall have a green ground wire included with the power wires from the fixture through the flexible conduit to the first outlet box.
G. Fixed electrical appliances and equipment shall be provided with a ground lug for termination of the equipment grounding conductor.
3.5 CORROSION INHIBITORS
A. When making grounding and bonding connections, apply a corrosion inhibitor to all contact surfaces. Use corrosion inhibitor appropriate for protecting a connection between the metals used.
3.6 CONDUCTIVE PIPING
A. Bond all conductive piping systems, interior and exterior, to the grounding electrode system. Bonding connections shall be made as close as practical to the equipment ground bus.
3.7 GROUND RESISTANCE
A. Grounding system resistance to ground shall not exceed 5 ohms. Make any modifications or additions to the grounding electrode system necessary for compliance without additional cost to the Government. Final tests shall ensure that this requirement is met.
B. Grounding system resistance shall comply with the electric utility company ground resistance requirements.
END OF SECTION
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