Attch_10-Section_26_05_20-Grounding_and_Bonding_0004.pdf

Stampede Penstock and Butterfly Valve Rehab

Washoe Project, California Solicitation No.

Grounding and Bonding

26 05 20 - 1

SECTION 26 05 20

GROUNDING AND BONDING

PART 1 GENERAL

1.01 MEASUREMENT AND PAYMENT

A. Cost:

Include in prices offered in the Price Schedule for items requiring grounding and bonding.

1.02 REFERENCE STANDARDS

A. ASTM International (ASTM)

1. ASTM B 3-13(2018) Soft or Annealed Copper Wire

2. ASTM B 8-11(2017) Concentric-Lay-Stranded Copper Conductors, Hard, Medium-Hard, or Soft

3. ASTM B 228-11a(2016) Concentric-Lay-Stranded Copper-Clad Steel Conductors

B. Institute of Electrical and Electronic Engineers (IEEE)

1. IEEE 80-2013 Safety in AC Substation Grounding

2. IEEE 81-2012 Measuring Earth Resistivity, Ground

Impedance, and Earth Surface Potentials of a Ground System

3. IEEE 142-2007 Grounding of Industrial and Commercial Power Systems

4. IEEE 837-2014 Qualifying Permanent Connections Used in

Substation Grounding

5. IEEE C2-2017 National Electrical Safety Code (NESC)

C. National Fire Protection Association (NFPA)

1. NFPA 70-2023 National Electric Code (NEC)

D. Underwriters Laboratories (UL)

1. UL 467-2013 Grounding and Bonding Equipment

1.03 SUBMITTALS

A. Submit the following in accordance with Section 01 33 00 - Submittals and 01 33 26 - Electrical Drawings and Data.

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B. RSN 26 05 20-1, Approval Data

1. Manufacturer’s technical catalog data

PART 2 PRODUCTS

2.01 MATERIALS

A. Ground Cable:

1. Annealed bare-copper cable:

a. ASTM B 8, class B.

b. Solid wires used in forming the copper cable: ASTM B 3.

2. Concentric stranded.

3. Sizes:

a. As indicated on drawings.

b. Where not shown, minimum sizes:

1) Ground risers and electrode conductors: 4/0 AWG.

2) Equipment grounding conductors:

a) Major equipment: Equal to size to electrode conductors.

b) Minor equipment: No. 4 AWG

3) Equipment ground ring bus: Equal in size to largest riser.

4) Electrode interconnecting conductors: Equal in size to electrode conductors.

2.02 ACCESSORIES

A. Cable Connectors:

1. Welded, bolted solderless or compression type.

2. Current-carrying capacity: Equal to cable with which they are used.

3. Connectors for ground cables, including fittings, lugs, bolts, nuts, and washers:

Copper alloy containing not more than 4 percent zinc.

4. Bolted solderless or compression type connectors: IEEE 837.

5. Ground connectors that will be direct buried or embedded in concrete: Listed for direct burial use in accordance with the requirements of UL 467.

2.03 WELDING PROCESS

A. Use Cadweld, Thermoweld, or equivalent exothermic process.

B. Molds and weld metal:

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1. Use fresh stock from same manufacturer.

2. Weld metal and starting material: No significant quantities of hazardous ingredients.

PART 3 EXECUTION

3.01 INSTALLATION

A. Install in accordance with NFPA 70, IEEE C2, IEEE 142, and this Section.

B. Connect equipment, metal conduit, steel structures, metal pull box covers, exposed metal surfaces, roof joists, metal fascia, metal doors and window frames, and other miscellaneous metalwork to grounding system as indicated on Standard Drawings 40-D-

4334, and 40-D-4335; and as shown on drawings.

C. Ground equipment and miscellaneous metalwork that is required to be grounded, but is not indicated on drawings to grounding system.

D. Connections:

1. Make all ground connections between equipment and miscellaneous metalwork, and ground plates of grounding system whether or not such grounding connections are indicated on drawings.

2. Number of grounding connections for equipment may be one, two, or more in some cases.

3. Remove paint, enamel, scale, oil, grease, or other foreign nonconductive material from point of contact on metal surfaces before making ground connections.

4. Repair damaged or removed paint or galvanizing material on metal finishes.

5. Make ground connections that will be direct buried or embedded in concrete:

a. Exothermic process.

b. In accordance with manufacturer's instructions.

END OF SECTION