36C26118B0235-019.docx
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36C26118B0235 S02. 260526 Grounding and Bonding for Electrical Systems.docx
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01-01-17
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. |
| B. | “Grounding electrode system” refers to grounding electrode conductors and all electrodes required or allowed by NEC, as well as made. |
| 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 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 grounding electrode conductors. |
| 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 |
| C. | National Fire Protection Association (NFPA): |
| 70-17 | National Electrical Code (NEC) |
| 70E-15 | National Electrical Safety Code |
| 99-15 | Health Care Facilities |
| D. | Underwriters Laboratories, Inc. (UL): |
| 44-14 | ThermosetInsulated Wires and Cables |
| 83-14 | ThermoplasticInsulated 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. | Conductor sizes shall not be less than shown on the drawings, or not less than required by the NEC, whichever is greater. |
| C. | Insulation: THHN-THWN and XHHW-2. XHHW-2 shall be used for isolated power systems. |
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. For patient care area electrical power system grounding, conform to the latest NFPA 70 and 99.
3.2 INACCESSIBLE GROUNDING CONNECTIONS
A. Make grounding connections, which are normally buried or otherwise inaccessible, by exothermic weld.
3.5 raceway
| A. | Conduit Systems: |
| 1. | Ground all metallic conduit systems. All metallic conduit systems shall contain an equipment grounding conductor. |
| 2. | 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. |
| 3. | 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 a 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. |
| 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. |
3.6 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 acceptance checks and tests
| A. | Resistance of the grounding electrode system shall be measured using a four-terminal fall-of-potential method as defined in IEEE 81. Ground resistance measurements shall be made before the electrical distribution system is energized or connected to the electric utility company ground system, and shall be made in normally dry conditions not fewer than 48 hours after the last rainfall. |
| B. | Resistance measurements of separate grounding electrode systems shall be made before the systems are bonded together. The combined resistance of separate systems may be used to meet the required resistance, but the specified number of electrodes must still be provided. |
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