Attachment_15_-_General_Electrical_Requirements.pdf

SECTION 16010

GENERAL ELECTRICAL REQUIREMENTS

PART 1 GENERAL

1.01 DESCRIPTION

A. Work Included

1. Materials, installation and testing of the electrical system.

1.02 REGULATORY AGENCIES AND STANDARDS

A. Regulatory Agencies: Installation, materials, equipment and workmanship shall conform to the latest provisions of the following agencies:

1. National Fire Protection Association (NFPA) Standard 70 - National Electrical Code (NEC).

2. Occupational Safety and Health Act (OSHA).

3. Uniform Building Code (UBC).

4. Local authorities having lawful jurisdiction pertaining to the work required.

5. California Code of Regulations (CCR), Title 24, Part 3, California Electrical Code (CEC)

B. Underwriters' Laboratories, Inc. (UL): Materials, appliances, equipment and devices shall conform to the applicable UL standards.

C. Standards: Where referenced in these specifications or on the drawings, the publications and standards of the following organizations apply:

1. American Society of Testing and Materials (ASTM).

2. National Electrical Manufacturers Association (NEMA).

3. National Fire Protection Association (NFPA).

4. American National Standards Institute (ANSI).

5. Institute of Electrical and Electronics Engineers (IEEE).

6. Insulated Cable Engineers Association (ICEA).

7. Association of Edison Illuminating Companies (AEIC).

8. American Association of State Highway and Transportation Officials

(AASHTO).

PART 2 MATERIALS

2.01 GENERAL

A. Similar materials and equipment shall be the product of a single manufacturer.

B. Provide and install equipment and materials shown on the drawings and as specified unless noted as "Not in Contract", "Future" or as "Existing to Remain". Provide only products which are new, undamaged and in the original cartons or containers.

Attachment 15

C. Materials and equipment shall be the standard products of manufacturers regularly engaged in the production of such material and shall be the manufacturer's current design. Items shall essentially duplicate equipment that has been in satisfactory use at least two years prior to bid opening.

D. Materials and equipment shall be suitable for storage, installation and operation in an ambient of 0°C to 40°C up to an elevation of 3,300 feet above sea level, except where more stringent conditions are stated in individual equipment specifications.

E. Factory finished electrical equipment, wire ways and panels with manufacturer's standard primer and enamel topcoats, unless stated otherwise in the individual equipment specifications. Provide 1 pint of the equipment manufacturer's touch-up paint per 500 square feet of painted surface for repair of damaged enamel topcoats.

2.02 TESTING LABORATORY APPROVALS

A. Electrical equipment (overall assemblies), materials and devices shall be listed, certified or found acceptable by an OSHA certified Nationally Recognized Testing Laboratory. Results of tests and inspections by the testing laboratory shall be submitted for review and approval to the local authorities having jurisdiction upon request. In testing the equipment, the following shall be considered:

1. Suitability for installation and use in conformity with the provisions of the NEC.

2. Mechanical strength and durability, including, for parts designed to enclose and protect other equipment, the adequacy of the protection thus provided.

3. Wire bending and connection space.

4. Electrical insulation.

5. Heating effects under normal conditions of use and also under abnormal conditions likely to arise in service.

6. Arcing effects.

7. Classification by type, size, voltage, current capacity and specific use.

8. Other factors which contribute to the practical safeguarding of persons using or likely to come in contact with the equipment.

B. Recognized testing laboratories are as follows:

1. Underwriters Laboratories, Inc. (UL).

2. Electrical Testing Laboratories (ETL).

3. Other testing laboratories certified by OSHA as a Nationally Recognized Testing Laboratory (NRTL).

C. Provide the testing laboratory label on equipment material and devices.

2.03 WARRANTY

A. Equipment materials and installation shall be guaranteed for a period of one year after the date of acceptance of the work by the Contracting Officer. Repair or remove and replace any and all work that is found to be defective in workmanship and/or materials within said one year periods, without expense whatsoever to the Contracting Officer, ordinary wear and tear and unusual abuse or neglect excepted.

PART 3 EXECUTION

3.01 INSTALLATION

A. At equipment, terminate wires and cables at the proper termination point per the manufacturer's recommendations. The drawings indicate connections for typical equipment only. If the equipment or connections are different from what is shown, provide the modifications necessary for a safe and properly operating installation in accordance with the equipment manufacturer's recommendations.

B. The drawings diagrammatically indicate the desired location and arrangement of outlets, conduit runs, equipment and other items. Field determine and coordinate exact location based on physical size and arrangement of equipment, finished elevations and obstructions.

C. Work or equipment not indicated or specified which is necessary for the complete and proper operation of the Electrical systems shall be accomplished without additional cost to the Government.

D. Install equipment and materials per the manufacturer's recommendations.

E. Install equipment and devices level and plumb.

3.02 ADJUSTMENTS AND TOUCH-UPS

A. Prior to energizing equipment, verify and ensure that all connections and terminations are correct for proper operation. Prior to energizing, make any corrections required for proper operation.

B. Operating mechanisms, door latches, and other movable components shall be adjusted so mechanical movement is free and correct.

C. Touch up all finished surfaces that are scratched or marred to match the original surface.

3.03 INSPECTION AND TESTING

A. Electrical Apparatus (Switchboards, Panelboards, Motor Control Centers, etc.) and feeder conductors: After completion of installation and prior to energization, perform the following inspections and testing on the equipment.

B. Visual and Mechanical Inspection:

1. Compare equipment nameplate data with drawings and specifications.

2. Inspect physical and mechanical condition.

3. Verify appropriate anchorage, required area clearances, physical damage, and correct alignment.

4. Inspect all doors, panels, and sections for corrosion, dents, scratches, fit, and missing hardware.

5. Verify that fuse and/or circuit breaker sizes and types correspond to drawings.

6. Verify tightness of accessible bolted electrical connections by calibrated torque-wrench method in accordance with manufacturer’s published data.

7. Confirm correct operation and sequencing of electrical and mechanical interlock systems.

a. Attempt closure on locked-open devices. Attempt to open locked-closed devices.

b. Make key exchange with devices operated in off-normal positions.

8. Thoroughly clean equipment prior to testing.

9. Lubrication:

a. Verify appropriate contact lubricant on moving current-carrying parts.

b. Verify appropriate lubrication on moving and sliding surfaces.

10. Inspect insulators for evidence of physical damage or contaminated surfaces.

11. Verify correct barrier and shutter installation and operation.

12. Exercise all active components.

13. Inspect all mechanical indicating devices for correct operation.

14. Verify that filters are in place and/or vents are clear.

C. Electrical Tests:

1. Perform insulation-resistance tests on the following:

a. Each conductor in lighting circuits.

2. Insulation-resistance tests shall be phase-to-phase and phase-to-ground, for one minute in accordance with the following table:

Maximum rating of equipment in volts

Minimum test voltage, DC in volts

Recommended minimum resistance in megohms

250 500 25

600 1000 100

3. If the minimum resistance values are not obtained, contact the Contracting Officer prior to energizing.

3.04 EQUIPMENT CLEANING

A. Prior to testing and energizing, thoroughly clean the exterior and interior of all equipment and enclosures including service control pedestal, pull boxes, junction boxes, underground pull boxes, etc. Vacuum the interior to remove all debris, dust, scrap wire and wrappings. After vacuuming, remove remaining dust with a dry, lint-free cloth.

1. Do not use compressed air to blow out debris, as this is likely to spread contamination.

3.05 OPERATIONAL TESTS

A. After energization of equipment, verify that all circuit breakers, protective and control devices function properly. Perform required adjustments to obtain correct operation.

3.06 NAMEPLATES

A. Provide nameplates on equipment, devices, panels and field mounted instruments (pressure switches, limit switches, etc.) to identify each item with its respective service or function. Use black-on-white laminated plastic (white lettering on black background), with beveled edges and engraved lettering not less than 1/4 inch high unless otherwise noted. Attach with 1/4-inch-long No. 4 Phillips, round head, coarse thread, Type 410 stainless steel, thread-cutting screws with blunt point unless otherwise specified. For exterior nameplates, provide silicon seal for screw penetrations. For cast iron enclosures mount nameplates with adhesive.

B. Provide nameplates for internal devices of equipment (control relays, contactors, timers, terminal blocks, etc.). Mount nameplates adjacent to, not on, the device.

C. Provide single, dedicated nameplates for devices mounted within and on equipment.

Provide as a minimum a single dedicated nameplate for each device (relay, switch, terminal block, meter, etc.). Nameplate shall agree with identification on manufacturer’s drawing. On devices mounted in front compartment doors; provide each device with two nameplates, one on the front and one on the back of the front compartment door. The nameplates mounted on the back of the door shall be stick-on type.

END OF SECTION

SECTION 16110

RACEWAYS, BOXES AND FITTINGS

PART 1 GENERAL

1.01 DESCRIPTION

A. Work Included

1. Raceways.

2. Boxes.

3. Fittings.

4. Supporting Devices.

B. Related Work

1. General Electrical Requirements: 16010.

2. Grounding: 16450.

PART 2 PRODUCTS

2.01 GENERAL

A. Raceways, boxes and fittings shall comply with Section 16010.

2.02 RIGID STEEL CONDUIT AND FITTINGS

A. Material:

1. Rigid Steel Conduit and Fittings: ANSI C80.1 and UL-6, hot dipped galvanized after threading. MINIMUM CONDUIT SIZE SHALL BE ¾”.

B. Fittings:

1. Locknuts: Steel or malleable iron.

2. Bushings: Threaded type, malleable iron, with 105°C rated plastic insulated throat. Plastic bushings with a temperature rating of 105°C may be used for conduits 1-inch and smaller. Provide grounding type bushings where required per Section 16450.

3. Box connectors for dry locations: Threaded pipe with locknuts.

4. Box Connectors for Damp and Wet Locations: Provide watertight threaded hubs consisting of sealing fitting with tapered conduit thread, neoprene O-ring, and 105°C rated insulating throat with grounding and bonding lug.

5. Couplings: Threaded, hot dipped galvanized after fabrication.

2.03 RIGID NONMETALLIC CONDUIT (PVC) AND FITTINGS

A. Material: Polyvinyl chloride (PVC), 90°C rise rating, conforming to NEMA TC-2 Type EC-40 and UL-651.

B. Conduit, Excluding Elbows: Schedule 40.

C. Elbows:

1. Conduit 3 inches and larger: Schedule 80.

2. Conduit smaller than 3 inches: Schedule 40 or 80 in accordance with Conduit Usage Schedule.

D. Couplings, adapters, bell ends, expansion couplings, elbows and turns of 30°:

Factory made to NEMA standards TC-2 and TC-3.

E. Joint Cement: As recommended by manufacturer as suitable for the climate, furnished with instructions to achieve watertight joints.

2.04 CONDUIT ELBOWS - GENERAL

A. Provide elbows with the following minimum radius:

CONDUIT SIZE MINIMUM RADIUS (INCHES)

3/4” 12 1” 12

1-1/4” 18 2” 24

2-1/2” 24 3” 30

3-1/2” 30 4” 30 5” 36 6” 42

2.05 CONDUIT BODIES

A. Provide threaded - hub cast ferrous or aluminum boxes. Provide with open type neoprene gaskets and matching cast ferrous covers, secured with at least two captive Type 304 stainless steel screws.

2.06 CONDUIT SEALING MATERIALS

A. Conduit Sealing Compound

1. Provide non-toxic conduit-sealing compounds consisting of 100% non-volatile solids including synthetic polymers with inert mineral fibers. Compounds shall have a putty-like consistency and shall be easily shaped and worked by hand and when pressed in place, shall cling to metal, plastic, rubber, painted surfaces, masonry, and concrete. In-place tolerance range shall be between – 30 degrees and 175 degrees F and the product shall not sag at 275 degrees F (for brief periods of exposure). Hand workable range shall be between the temperatures of 25 degrees F and 120 degrees F. Dielectric strength of the compound shall be 110 Volts/mil in accordance with ASTM D149-64.

2.07 SUPPORTING DEVICES

A. Anchor Bolts and Screws

1. Materials

a. Outdoor, Wet or Corrosive Areas: Anchor bolts and screws shall be Type 316 ASTM A276 stainless steel. Nuts shall be hex Type 316 stainless steel, ASTM A194, Grade 8M, or ASTM F594, Type 316 stainless steel.

2. Types

a. Concrete: Wedge, sleeve, or self-drilling expansion anchor bolts.

2.08 UNDERGROUND PULL BOXES

A. General: Provide precast concrete units complying with ASTM C858 with a load designation of A-16. Dimensions indicated on drawings are inside box dimensions.

Provide units manufactured by Associated Concrete Products, Brooks Products, Christy or equivalent.

B. Hand holes: Refer to drawings for size. Provide hand holes with concrete bolt down covers in unpaved areas and with flush mounted cast iron traffic covers with bolt downs and lifting hook in paved areas.

C. Cover Identification: engrave or bead weld hand hole and pull box covers to indicated services within pull box as follows:

Service Identification

Power Electric General Area Lighting Lighting

PART 3 EXECUTION

3.01 CONDUIT USAGE SCHEDULE

General: Install the following types of conduits and fittings in locations listed, unless otherwise noted in the drawings.

A. Exterior, Exposed:

1. Material: Rigid steel conduit.

B. Underground Direct Burial, or Below Concrete Slabs or Stub-ups:

1. Material, Excluding Elbows and Stub-ups: Rigid non-metallic conduit or rigid steel conduit painted with 3M Scotchrap pipe primer and wrapped with Scotchrap 51 plastic tape with 1/2-inch overlap.

2. Elbows Excluding Stub-Ups:

a. Conduit Smaller than 3 Inches:

1) Underground: Schedule 40 PVC.

2) Stub-ups from below grade to above grade: Schedule 80 PVC.

3. Stub-ups from 6 inches below grade to above grade (includes elbows from horizontal underground to stub-up): Rigid steel painted with 3M Scotchrap pipe primer and wrapped with Scotchrap 51 plastic tape with 1/2-inch overlap.

Use liquid-tite flexible metal conduit for connections to generator.

3.02 RACEWAY FILL

A. For runs that are not sized in drawings, compute the maximum conduit fill using NEC requirements for type THHN/THWN conductors (larger if applicable), although the actual wiring may be with types of conductors having smaller cross-sections.

3.03 CONDUIT INSTALLATION, GENERAL

A. Conduit runs are shown schematically. Install concealed unless specifically noted otherwise. Supports, pull boxes, junction boxes, and other ancillary equipment are not usually shown. Provide pull boxes and junction boxes where shown.

B. Run exposed conduits parallel and perpendicular to surface or exposed structural members and follow surface contours as much as practical to provide a neat appearance.

C. Make bends and offsets so that the inside diameter of conduit is not effectively reduced. Unless otherwise indicated, keep the legs of a bend in the same plane and the straight legs of offsets parallel.

D. Cap all conduits immediately after installation to prevent entrance of foreign matter.

E. Do not use diagonal runs except for concealed areas or when specifically shown in the drawings.

F. Treat threaded joints of rigid steel conduit with T&B "Kopr-Shield" before installing fittings where conduit is in slabs, damp or corrosive areas.

G. Rigid Steel Conduit Terminations:

1. Install conduits squarely to the box when terminating with locknuts and provide one locknut outside the box and one locknut and bushing inside the box.

Install locknuts with dished side against the box. When terminating in threaded hubs, screw the conduit or fitting tight into the hub so that the end bears against the fire protection shoulder.

2. When chase nipples are used, install the raceway and coupling square to the box and tighten the chase nipple leaving no exposed threads.

H. Do not route conduits below or within concrete footing except to cross footing at 90 degree angles.

I. Install exposed, parallel, or banked raceways together. Make bends in parallel or banked runs from the same center line so that the bends are parallel. Factory elbows may be used in banked runs only where they can be installed parallel.

J. Provide expansion fittings for raceways crossing expansion joints in structures and in straight runs exceeding 100 feet.

K. The distance between pull boxes shall not exceed 150 feet.

L. Cut conduit square, ream and remove burrs before installation.

M. Install PVC coated conduit in accordance with the manufacturer’s instructions.

N. Conduit Cleaning: Clean conduits with an assembly that consists of a flexible mandrel (manufacturer’s standard product in lengths recommended for the specified size and type of duct) that is 1/4 inch less than inside diameter of duct, 2 wire brushes, and a rag. The cleaning assembly shall be pulled through conduit a minimum of two times or until all debris is expelled from the duct.

1. Where cable is being installed in existing conduits, clean conduits a minimum of four weeks prior to cable installation. After cleaning, plug conduit ends with conduit plugs. Within 24 hours of installing cable, re-clean conduits.

3.04 GROUNDING

A. Provide grounding in accordance with Section 16450.

B. Use grounding bushings for conduits carrying a bonding jumper conductor.

C. Provide a grounding conductor in flexible and liquid-tite flexible conduit, size conforming to NEC Article 250 -Equipment Grounding Conductors.

3.05 DAMAGED CONDUITS

A. Repair or replace conduit damaged during or after installation.

B. Replace crushed or clogged conduit or any conduit whose inner surface is damaged or not smooth.

C. Repair cuts, nicks or abrasions in the zinc coating of galvanized conduit with galvanizing repair stick, Enterprise Galvanizing "Galvabra" or equivalent.

D. Repair cuts, nicks or abrasions in the PVC coating of the conduit with the manufacturer’s recommended PVC material and build up surface thickness to match the factory coating thickness and color.

3.06 WARNING TAPES

A. Bury warning tapes approximately 12 inches below grade, above all underground conduits and duct banks. Align parallel to and within 3 inches of the centerline of the conduit or duct bank.

B. Plastic tape shall be yellow, 6 inch minimum width. Utilize tape made of material resistant to corrosive soil. Use tape with printed warning that an electric circuit is located below the tape.

3.07 ADJUSTING AND CLEANING

A. Upon completion of installation of raceways and boxes, inspect interiors of raceways and boxes; clear all blockages and remove burrs, dirt, and construction debris.

3.08 SEISMIC ANCHORING AND RESTRAINTS

A. Equipment Anchors: Securely anchor electrical equipment. Anchoring shall have the capability of withstanding seismic forces per the latest edition of the California Building Code, Title 24, Volume 2, Part 2, Section 1632A, Seismic Zone 3, with Ca = 0.36, 1p = 1.5, Rp = 3.0, and ap = 1.0.

B. Provide seismic bracing system. Install per manufacturer’s requirements. Properly torque all bolts to the recommended values.

SECTION 16120

WIRES AND CABLES

PART 1 GENERAL

1.01 DESCRIPTION

A. Work Included

1. Wires and cables, 600 volts and less.

B. Related Work

1. General Electrical Requirements: 16010.

PART 2 MATERIALS

2.01 GENERAL

A. Wires and cables shall comply with Section 16010.

2.02 POWER CONDUCTORS

A. Conductor material: Class B stranded, soft annealed copper per ASTM B-3.

B. Insulation: THHN/THWN, 600-volt insulated, color coded per Part 3: Identification.

C. Minimum conductor size: No. 12 AWG.

2.03 CONDUCTOR CONNECTOR/SPLICES

A. Aboveground Dry and Damp Locations, #10 AWG and Smaller:

B. Aboveground Dry and Damp Locations, #8 AWG and Larger:

1. Use one piece, standard length barrel, copper compression splice.

2.04 PULLING COMPOUND

A. Use only cable pulling compound which is approved by the manufacturer of the cable as being compatible with cable insulation and jacket materials.

2.05 CONDUCTOR TAGS

A. For termination of individual conductors, provide plastic sleeve markers.

PART 3 EXECUTION

3.01 WIRE INSTALLATION

A. Install wiring and cable in conduit unless otherwise noted.

B. To reduce pulling tension in long runs, coat cables with pulling compound.

C. Remove debris and moisture from the conduits, boxes and cabinets prior to cable installation.

D. Group conductors in panelboards, motor control centers, cabinets, pull boxes and switchboard wire ways; tie with plastic ties; and fan out to terminals.

E. Terminate phase conductors A, B and C reading left to right, front to back or top to bottom looking into the front of the equipment.

3.02 IDENTIFICATION

A. Color Coding of Power Wire: Provide color coding throughout the entire network of feeders and circuits (600 volts and below) as follows:

Phase 240/120 Volts 208/120 Volts 240 Volts 480/277 Volts

Phase A Black Black Black Brown Phase B Red Red Red Orange Phase C --- Blue Blue Yellow Neutral White White White Gray Ground Green Green Green Green

B. Conductors #10 AWG and smaller shall have factory color coding with solid color insulation.

C. Conductors #8 AWG and larger shall have factory color coding with solid color insulation or shall have black insulation with on-site application of colored tape at conductor terminations and at splices. If color tape is used, install 2 layers minimum.

D. Tagging of Conductors: Tag power wires with the feeder identifier if shown on the drawings or panelboard number and circuit numbers. In panelboards, tag conductors with circuit numbers one inch from termination at circuit breaker.

3.03 WIRE SPLICING AND CONNECTING

A. Tighten electrical connections and terminals, including screws and bolts, in accordance with manufacturer's published torque tightening values. Where manufacturer's torquing requirements are not indicated, tighten connectors and terminals to comply with tightening torques specified in UL 486A and UL 486B.

B. Retighten bolt-type connectors 24 to 48 hours after initial installation and before taping.

C. Insulate splices with either tape or with shrinkable insulators.

1. Tape connections as follows: Step 1 - apply one layer of varnished cambric tape; Step 2 - apply vinyl mastic for air/moisture seal; Step 3 - apply one layer of rubber tape half lapped; Step 4 - apply two layers of half lapped vinyl tape.

3.04 INSULATION RESISTANCE TESTS (CIRCUITS BELOW 600 VOLTS)

A. Perform insulation resistance test for each feeder and motor circuit prior to energizing. Applied potential to be 1,000 volts DC for 1 minute. Insulation resistance between conductors and between each conductor and ground shall not be less than 2 megohms. Repair or replace wires or cables in circuits which do not pass this test and repeat the test.

SECTION 16160

PANELBOARDS

PART 1 GENERAL

1.01 DESCRIPTION

A. Work Included.

1. Panelboards.

B. Related Work

1. General Electrical Requirements: 16010.

1.02 SUBMITTALS

A. Submit manufacturer’s catalog data including complete catalog number, showing ratings and characteristics including voltage ratings, amperage ratings, enclosure type, and mounting provisions.

B. Submit manufacturer’s catalog data for circuit breakers and devices.

C. Submit nameplate designations, sizes and mounting methods.

PART 2 MATERIALS

2.01 GENERAL

A. Panelboards shall comply with Section 16010.

B. Provide dead front, circuit breaker, safety-type panelboards per NEMA PB-1 with voltage ratings as scheduled.

C. Provide panelboards with permanent circuit numbers.

2.02 CABINETS

A. Enclose panelboards located indoors in a single sheet metal cabinet (NEMA 1).

Provide with piano hinged interior door mounted to a piano hinged trim door. Hinged trim door shall expose both gutters and shall be secured with screws. Secure hinged interior door with flush catch, lock and trim. Provide metal frame directory holder with cover on the inside of the door. Directory holder shall be factory welded to the interior of the interior hinged door.

2.03 CIRCUIT BREAKERS

A. Molded-case: Provide quick-make and quick-break toggle mechanisms, inverse-time trip characteristics, and trip-free operation on overload or short circuit. Automatic tripping shall be indicated by a handle position between the manual OFF and ON position.

B. Single-pole breakers shall be full module size; two pole shall not be installed in a single module. Multiple circuit breakers shall be of the common-trip type having a single operating handle.

C. Circuit breaker current-carrying connections to the bus shall be bolted type.

2.04 BUS BARS

A. Bus bars shall be copper. Provide a copper ground bus bar installed on the panelboard frame, bonded to the box and containing at least 10 terminal screws.

2.05 GROUNDING BAR KITS

A. Provide copper grounding bars with main lug provisions. Bond grounding bars to the panel enclosure. Equip grounding bars with a dedicated grounding termination point for each branch circuit, including spaces.

2.06 SPACE ONLY

A. Where “space only” is noted on the drawings, provide connectors, mounting brackets, etc., for the future insertion of an overcurrent device of the size indicated.

2.07 DIRECTORIES

A. Provide typed circuit directories located in the directory holder. Type directory with capital letters, with odd numbered circuits on the left side or top and with even circuits on the right side or bottom. Define accurately and briefly the connected load and location (example: AC-1 MTD ON ROOF).

2.08 NAMEPLATES

A. Provide nameplates with ¼ inch lettering as specified in Section 16010. Designate the panel name on the first line. Center each line on the nameplate. Remaining lines shall indicate voltage, amperes, phases, number of wires.

PART 3 EXECUTION

3.01 MOUNTING

A. Mount top of panelboards at 6 feet above finished floor.

3.02 CONDUCTOR TAGGING

A. At a point 1 inch away from the circuit breaker, tag power conductors with panelboard circuit number. Conductor tags shall be in accordance with Section 16120.

3.03 TESTS

A. Operate each circuit breaker and verify that all phases of each load are disconnected.

SECTION 16450

GROUNDING

PART 1 GENERAL

1.01 DESCRIPTION

A. Work Included.

1. Electrical Grounding.

B. Related Work Specified Elsewhere

1. General Electrical Requirements: 16010.

2. Wire and Cables: 16120.

PART 2 MATERIALS

2.01 GENERAL

A. Materials shall comply with Section 16010.

2.02 GROUND CONDUCTORS

A. Underground ground conductors not in conduit shall be annealed bare standard copper conforming to ASTM B8.

B. Ground conductors in raceway shall comply with Section 16120 for power wire.

PART 3 EXECUTION

3.01 EQUIPMENT GROUNDING

A. Ground raceways and noncurrent carrying parts of electrical equipment in accordance with NEC Article 250. Use the metallic conduit system for equipment and enclosure grounding. Grounding through the conduit system shall be in excess of any ground conductors shown on the drawings. Install grounding bushings on conduits at panelboards and switchboards. Connect grounding bushing to ground bus with ground conductor sized in accordance with NEC Table 250-95.

B. Connect the ground buses of panelboards to the ground bus with a grounding conductor.

C. Coordinate location of ground conductor stub-ups with equipment being furnished.

C. Provide the testing laboratory label on equipment material and devices.