Amendment_0001_33_71_02_-_UG_Elec_Distribution_-_31Jul2017.pdf

CE0435

31Jul2017

33 71 02 – Page 1 of 19

SECTION 33 71 02

UNDERGROUND ELECTRICAL DISTRIBUTION

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN ASSOCIATION OF STATE HIGHWAY AND TRANSPORTATION OFFICIALS

(AASHTO)

AASHTO HB-17 (2002; Errata 2003; Errata 2005, 17th

Edition) Standard Specifications for Highway Bridges

AASHTO M 198 (2010) Standard Specification for Joints for Concrete Pipe, Manholes, and Precast Box Sections Using Preformed Flexible Joint Sealants

AMERICAN CONCRETE INSTITUTE INTERNATIONAL (ACI)

ACI 318M (2014) Building Code Requirements for

Structural Concrete & Commentary

ACI SP-66 (2004) ACI Detailing Manual

ASTM INTERNATIONAL (ASTM)

ASTM C 478 (2015) Standard Specification for Precast Reinforced Concrete Manhole Sections

ASTM C 857 (2014) Standard Practice for Minimum

Structural Design Loading for Underground Precast Concrete Utility Structures

INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE)

IEEE 48 (2009) Standard for Test Procedures and

Requirements for Alternating-Current Cable Terminations Used on Shielded Cables Having Laminated Insulation Rated 2.5 kV through 765 kV or Extruded Insulation Rated 2.5 kV through 500 kV

IEEE 81 (2012) Guide for Measuring Earth

Resistivity, Ground Impedance, and Earth Surface Potentials of a Ground System

IEEE 386 (2006; INT 1 2011) Standard for Separable

Insulated Connector Systems for Power Distribution Systems above 600V

33 71 02 – Page 2 of 19

IEEE 404 (2012) Standard for Extruded and Laminated

Dielectric Shielded Cable Joints Rated 2500 V to 500,000 V

IEEE C2 (20122017; Errata 2012; INT 1-4 2012; INT 5-7

2013; INT 8-10 2014; INT 11 2015) National Electrical Safety Code

IEEE C57.12.28 (2014) Standard for Pad-Mounted Equipment

- Enclosure Integrity

IEEE Stds Dictionary (2009) IEEE Standards Dictionary: Glossary of Terms & Definitions

INTERNATIONAL ELECTRICAL TESTING ASSOCIATION (NETA)

NETA ATS (2013) Standard for Acceptance Testing Specifications for Electrical Power Equipment and Systems

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

NEMA TC 14 (2002) Reinforced Thermosetting Resin

Conduits (RTRC) and Fittings

NEMA WC 74 (2012) 5-46 kV Shielded Power Cable for

Use in the Transmission and Distribution of Electric Energy

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 70 (2014; AMD 1 2013; Errata 1 2013; AMD 2

2013; Errata 2 2013; AMD 3 2014; Errata 3-4 2014; AMD 4-6 2014) National Electrical Code

TELECOMMUNICATIONS INDUSTRY ASSOCIATION (TIA)

TIA-758 (2012b) Customer-Owned Outside Plant Telecommunications Infrastructure Standard

U.S. DEPARTMENT OF AGRICULTURE (USDA)

RUS Bull 1751F-644 (2002) Underground Plant Construction

UNDERWRITERS LABORATORIES (UL)

UL 6 (2007; Reprint Nov 2014) Electrical Rigid Metal Conduit-Steel

UL 94 (2013; Reprint Jul 2015) Standard for

Tests for Flammability of Plastic Materials for Parts in Devices and Appliances

UL 467 (2007) Grounding and Bonding Equipment

33 71 02 – Page 3 of 19

UL 1684 (2009) Standard for Safety for Reinforced Thermosetting Resin Conduit (RTRC) and Fittings, UL 2515 AG (2014) Standard for Safety for Aboveground

Reinforced Thermosetting Resin Conduit (RTRC) and Fittings

1.2 DEFINITIONS

a. Unless otherwise specified or indicated, electrical and electronics terms used in these specifications, and on the drawings, are as defined in IEEE Stds Dictionary.

b. In the text of this section, the words conduit and duct are used interchangeably and have the same meaning.

1.3 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for Contractor Quality Control approval. Submit the following in accordance with Section 01 33 00

SUBMITTAL PROCEDURES:

SD-02 Shop Drawings

Precast underground structures; G Include construction details, concrete strength, covers and frames, locking means, and details of waterproof joint sealants.

Medium voltage sectionalizing cabinets

SD-03 Product Data

Fiberglass conduit; G Medium voltage cables; G Medium voltage cable terminations; G Separable insulated connectors; G Cable supports (racks, arms and insulators); G Duct separators (for directional boring); G

Protective Devices and Coordination Study; G

The study must be submitted with protective device equipment submittals. No time extension or similar contract modifications will be granted for work arising out of the requirements for this study. Approval of protective devices proposed must be based on recommendations of this study. The Government must not be held responsible for any changes to equipment, device ratings, settings, or additional labor for installation of equipment or devices ordered or procured prior to approval of the study.

SD-06 Test Reports

Medium voltage cable production tests Field acceptance checks and tests Medium voltage cable tests; G Grounding system tests; G Arc-proofing test for cable fireproofing tape

Cable Installation Plan and Procedure; G

33 71 02 – Page 4 of 19

Six copies of the information described below in 8-1/2 by 11 inch 3-ring binders from which material may readily be removed and replaced, including a separate section for each cable pull.

Sections shall be separated by heavy plastic dividers with tabs, with all data sheets signed and dated by the person supervising the pull.

a. Site layout drawing with cable pulls numerically identified.

b. A list of equipment used, with calibration certifications.

c. The cable manufacturer and type of cable.

d. The manufacturer and quantity of lubricant used on pull.

d. Dates of cable pulls, time of day, and ambient temperature.

e. Length of cable pull and calculated cable pulling tensions.

f. Actual cable pulling tensions encountered during pull.

SD-07 Certificates

Cable terminator certifications; G Cable installer qualifications; G Certificate of conformance for directional boring; G

1.4 QUALITY ASSURANCE

1.4.1 Precast Underground Structures

Submittal required for each type used. Provide calculations and drawings for precast manholes and handholes bearing the seal of a registered professional engineer including:

a. Material description (i.e., f'c and Fy)

b. Manufacturer's printed assembly and installation instructions

c. Design calculations

d. Reinforcing shop drawings in accordance with ACI SP-66

e. Plans and elevations showing opening and pulling-in iron locations and details

1.4.2 Cable Terminator Certifications

Certification of the qualification of the cable terminator shall be submitted, for approval, 30 days before terminations are to be made in medium voltage (5 kV to 35 kV) cables. The certification shall include the training, and experience of the individual on the specific type and classification of cable to be provided under this contract. The certification shall indicate that the individual has had three or more years recent experience terminating medium voltage cables. The certification shall also list a minimum of three terminations that have been in operation for more than one year. In addition, the individual may be required to perform a dummy or practice termination in the presence of the Contracting Officer, before being approved as a qualified cable splicer. If that additional requirement is imposed, the Contractor shall provide short sections of the approved types of cables along with the approved type of termination kit or separable connector, and detailed manufacturer's instructions for the cable to be terminated. The Contracting Officer reserves the right to require additional proof of competency or to reject the individual and call for certification of an alternate cable terminator.

1.4.3 Cable Installer Qualifications

33 71 02 – Page 5 of 19

Provide at least one onsite person in a supervisory position with a documentable level of competency and experience to supervise all cable pulling operations. Provide a resume showing the cable installers' experience in the last three years, including a list of references complete with points of contact, addresses and telephone numbers. Cable installer must demonstrate experience with a minimum of three medium voltage cable installations. The Contracting Officer reserves the right to require additional proof of competency or to reject the individual and call for an alternate qualified cable installer.

1.4.4 Directional Boring Certificate of Conformance

Provide certification of compliance with the registered Professional Engineer's design requirements for each directional bore, including: HDPE conduit size and type, bend radius, elevation changes, vertical and horizontal path deviations, conductor size and type and any conductor derating due to depth of conduit. Record location and depth of all directional-bore installed HDPE conduits using Global Positioning System (GPS) recording means with "resource grade" accuracy.

1.4.5 Regulatory Requirements

In each of the publications referred to herein, consider the advisory provisions to be mandatory, as though the word, "must" had been substituted for "should" wherever it appears. Interpret references in these publications to the "authority having jurisdiction," or words of similar meaning, to mean the Contracting Officer. Equipment, materials, installation, and workmanship must be in accordance with the mandatory and advisory provisions of IEEE C2 and NFPA 70 unless more stringent requirements are specified or indicated.

1.4.6 Standard Products

Provide materials and equipment that are products of manufacturers regularly engaged in the production of such products which are of equal material, design and workmanship. Products must have been in satisfactory commercial or industrial use for 2 years prior to bid opening. The 2-year period must include applications of equipment and materials under similar circumstances and of similar size. The product must have been for sale on the commercial market through advertisements, manufacturers' catalogs, or brochures during the 2-year period. Where two or more items of the same class of equipment are required, these items must be products of a single manufacturer; however, the component parts of the item need not be the products of the same manufacturer unless stated in this section.

1.4.6.1 Alternative Qualifications

Products having less than a 2-year field service record will be acceptable if a certified record of satisfactory field operation for not less than 6000 hours, exclusive of the manufacturers' factory or laboratory tests, is furnished.

1.4.6.2 Material and Equipment Manufacturing Date

Products manufactured more than 2 years prior to date of delivery to site are not acceptable, unless specified otherwise.

33 71 02 – Page 6 of 19

PART 2 PRODUCTS

2.1 CONDUIT, DUCTS, AND FITTINGS

2.1.1 Fiberglass Conduit for UG Distribution

NEMA TC 14, UL 2515 AG (Above Ground), UL 1684. Provide heavy wall, epoxy fiberglass conduit suitable for above-ground and below-ground applications. Conduits shall be supplied in 20-foot lengths with interference joints. Conduit shall be used for direct burial and directional boring installations. Sizes shall be as indicated on the drawings. Conduits shall be Champion Fiberglass 50C-HW-20-I (the "50" denotes 5-inch IPS conduit) or approved equal.

Provide two-part adhesive epoxy resin system specifically designed for joining fiberglass conduit, and of the same manufacturer as the conduit.

For vertical risers at poles, provide manufactured rigid steel elbows with rigid steel conduit extending up the pole as indicated. Steel elbow radius shall be 48 inches. Conduit shall conform to UL 6. Tape all rigid steel conduits in contact with soil using a suitable mastic or plastic tape wrap to prevent corrosion.

2.1.2 Duct Sealant

UL 94, Class HBF. Provide high-expansion urethane foam duct sealant that expands and hardens to form a closed, chemically and water resistant, rigid structure. Sealant must be compatible with common cable and wire jackets and capable of adhering to metals, plastics and concrete. Sealant must be capable of curing in temperature ranges of 35 degrees F to 95 degrees F. Cured sealant must withstand temperature ranges of -20 degrees F to 200 degrees F without loss of function.

2.1.3 Fittings

Provide fiberglass conduit elbows, end bells with socket, stop couplings and single expansion joint sockets with O-ring as required to join and terminate conduits. Fittings shall be of the same type, wall thickness, and above-ground rating, and manufacturer as the fiberglass conduits.

2.2 LOW VOLTAGE CONDUCTORS AND CABLES

Low voltage conductors, cables, splices and terminations shall be as specified in Section 26 20 00 ELECTRICAL DISTRIBUTION SYSTEM.

2.3 NOT USED

2.4 MEDIUM VOLTAGE CABLES

Medium voltage cables shall be single conductor stranded copper cables conforming to the requirements of NEMA WC 74. Cables shall be rated MV-105, 15 kV with 133 percent insulation level. Cables shall be approved for cable tray use, installation in underground ducts, and for direct burial applications. Cables shall have the date of manufacture and other identification imprinted on the outer jacket at regular intervals throughout the cable length. Wires and cables manufactured more than 24 months prior to date of delivery to the site shall not be accepted.

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2.4.1 Cable Construction

Cable construction (from the core outward) shall consist of:

a. Compact stranded copper conductor

b. Inner semiconducting strand screen

c. Ethylen-propylen rubber (EPR) core insulation

d. Outer semiconducting insulation screen

e. Copper tape shield

f. Polyvinyl chloride (PVC) outer jacket, sunlight resistant.

2.4.2 Medium Voltage Cable Production Tests

Submit results of NEMA WC 74 qualification and production tests as applicable for each type of medium voltage cable.

2.5 MEDIUM VOLTAGE CABLE TERMINATIONS

IEEE 48 Class 1. Terminations shall be cold-shrink outdoor type, consisting of prestretched ethylene propylene diene monomer (EPDM) stress control tubes and prestretched silicone rubber skirted insulators.

Terminations shall have high-dielectric constant (capacitive) stress control integrated within a skirted insulator. Terminations shall not require heat or flame for installation. Terminations shall be designed for installation in low or highly contaminated indoor and outdoor locations and shall resist ultraviolet rays and oxidative decomposition.

Terminations shall be rated as follows:

1/0 and 2/0 AWG cables: 95 kV BIL minimum with 2-skirt insulator 4/0 AWG and larger: 150 kV BIL with 4-skirt insulator

Termination kit shall contain all necessary materials (except for the lugs). Terminations, where required, shall be provided with mounting brackets suitable for the intended installation and with grounding provisions for the cable shielding, metallic sheath, or armor.

Separable insulated connectors shall be used for apparatus terminations, when such apparatus is provided with suitable bushings. See paragraph SEPARABLE INSULATED CONNECTORS in this Section.

2.6 MEDIUM VOLTAGE CABLE JOINTS

Splicing of medium voltage cables is not permitted. Deadbreak 600 ampere separable connectors shall be used, in manholes and vaults only, for joing medium voltage cables.IEEE 404.

2.7 SEPARABLE INSULATED CONNECTORS

IEEE 386. Provide connector with steel reinforced hook-stick eye, grounding eye, test point, and arc-quenching contact material. Provide connectors of the loadbreak or deadbreak type as indicated, of suitable construction for the application and the type of cable connected, and that include cable shield adaptors. Provide external clamping points and test points.

a. 200 Ampere loadbreak connector ratings: NOT USED.

b. 600 Ampere deadbreak connector ratings: Voltage: 15 kV, 95 kV

BIL. Short time rating: 25,000 rms symmetrical amperes.

Connectors shall have 200 ampere bushing interface for surge

33 71 02 – Page 8 of 19 arresters.

2.8 FIBER OPTIC CABLING

Provide fiber optic cabling underground and attached to wood poles from Gingko Substation to the Main Substation.

2.9 TAPE

2.9.1 Insulating Tape

Provide vinyl insulating tape, 7-mils (0.178 mm) thick by 19 mm wide, all-weather type, capable of performing in a continuous temperature environment of 105 degrees C, and conformable down to -18 degrees C. Tape shall be 3M Scotch Super 33+ or approved equal.

2.9.2 Fireproofing Tape

Provide tape composed of a flexible conformable unsupported intumescent elastomer. Tape shall be not less than 30-mils (0.762 mm) thick by 76 mm wide, thick, noncorrosive to cable sheath, self-extinguishing, noncombustible, and shall not deteriorate when subjected to oil, water, gases, salt water, sewage, and fungus.

2.9.3 Arc-Proofing Test for Cable Fireproofing Tape

Manufacturer shall test one sample assembly consisting of a straight lead tube 305 mm long with a 63.5 mm outside diameter and a 3.175 mm thick wall, covered with one-half lap layer of arc and fireproofing material per manufacturer's instructions. The arc and fireproofing tape shall withstand extreme temperature of a high-current fault arc 13,000 degrees K for 70 cycles as determined by using an argon directed plasma jet capable of constantly producing and maintaining an arc temperature of 13,000 degrees K. Temperature (13,000 degrees K) of the ignited arc between the cathode and anode shall be obtained from a dc power source of 305 (plus or minus 5) amperes and 20 (plus or minus 1) volts. The arc shall be directed toward the sample assembly accurately positioned 5 (plus or minus

1) millimeters downstream in the plasma from the anode orifice by fixed flow rate of argon gas (0.18 g per second). Each sample assembly shall be tested at three unrelated points. Start time for tests shall be taken from recorded peak current when the specimen is exposed to the full test temperature. Surface heat on the specimen prior to that time shall be minimal. The end point is established when the plasma or conductive arc penetrates the protective tape and strikes the lead tube. Submittals for arc-proofing tape shall indicate that the test has been performed and passed by the manufacturer.

2.9.4 Buried Warning and Identification Tape

Provide detectable warning tape above all duct banks and direct buried conduits as indicated on the drawings.

2.10 PULL ROPE

Plastic or flat pull line (bull line) having a minimum tensile strength of 200 pounds.

33 71 02 – Page 9 of 19

2.11 GROUNDING AND BONDING

2.11.1 Driven Ground Rods

Provide copper-clad steel ground rods conforming to UL 467 not less than 3/4 inch in diameter by 10 feet in length. Sectional type rods shall not be used.

2.11.2 Grounding Conductors

Grounding conductors shall be stranded copper with no insulation except where installed in conduit with associated phase conductors. Insulated grounding conductors shall have green-yellow colored insulation.

Insulation be of the same material as phase conductors, except that conductors shall be rated 600 volts. Aluminum grounding conductors shall not be used.

2.12 CAST-IN-PLACE CONCRETE

Provide concrete in accordance with Section 03 30 53 MISCELLANEOUS CAST-IN-PLACE CONCRETE. Concrete shall have a 28-day compressive strength of not less than 4000 3000 psi.

2.13 UNDERGROUND STRUCTURES

Provide precast concrete underground structures as indicated, conforming to ASTM C 857 and ASTM C 478. Structures shall be the product of a manufacturer regularly engaged in the manufacture of precast concrete products, including precast manholes.Top, walls, and bottom shall consist of reinforced concrete. Walls and bottom shall be of monolithic concrete construction. Locate duct entrances and windows near the corners of structures to facilitate cable racking. Covers shall fit the frames without undue play. Form steel and iron to shape and size with sharp lines and angles. Castings shall be free from warp and blow holes that may impair strength or appearance. Exposed metal shall have a smooth finish and sharp lines and arises. Provide necessary lugs, rabbets, and brackets. Set pulling-in irons and other built-in items in place before depositing concrete. Install a pulling-in iron in the wall opposite each duct bank entrance. Cable racks, including rack arms and insulators, shall be adequate to accommodate the cables.

2.13.1 Design for Precast Structures

ACI 318M. In the absence of detailed on-site soil information, design for the following soil parameters/site conditions:

a. Angle of Internal Friction (phi) = 30 degrees

b. Unit Weight of Soil (Dry) = 110 pcf, (Saturated) = 130 pcf

c. Coefficient of Lateral Earth Pressure (Ka) = 0.33

d. Ground Water Level = 3 feet below ground elevation

e. Vertical design loads shall include full dead, superimposed dead, and live loads including a 30 percent magnification factor for impact. Live loads shall consider all types and magnitudes of vehicular (automotive, industrial, or aircraft) traffic to be encountered. The minimum design vertical load shall be for H20 highway loading per AASHTO HB-17.

f. Horizontal design loads shall include full geostatic and

33 71 02 – Page 10 of 19 hydrostatic pressures for the soil parameters, water table, and depth of installation to be encountered. Also, horizontal loads imposed by adjacent structure foundations, and horizontal load components of vertical design loads, including impact, shall be considered, along with a pulling-in iron design load of 6000 pounds.

g. Each structural component shall be designed for the load combination and positioning resulting in the maximum shear and moment for that particular component.

h. Design shall also consider the live loads induced in the handling, installation, and backfilling of the manholes. Provide lifting devices to ensure structural integrity during handling and installation.

i. Concrete for precast work shall have a 28-day compressive strength of not less than 4000 psi.

2.13.2 Construction

Structure top, bottom, and wall shall be of a uniform thickness of not less than 6 inches. Thin-walled knock-out panels for designed or future duct bank entrances shall not be permitted. Quantity, size, and location of duct bank entrance windows shall be as directed, and cast completely open by the precaster. Size of windows shall exceed the nominal duct bank envelope dimensions by at least 12 inches vertically and horizontally to preclude in-field window modifications made necessary by duct bank misalignment. However, the sides of precast windows shall be a minimum of 6 inches from the inside surface of adjacent walls, floors, or ceilings.

Form the perimeter of precast window openings to have a keyed or inward flared surface to provide a positive interlock with the mating duct bank envelope. Provide welded wire fabric reinforcing through window openings for in-field cutting and flaring into duct bank envelopes. Provide additional reinforcing steel comprised of at least two No. 4 bars around window openings. Provide drain sumps a minimum of 12 inches in diameter and 4 inches deep for precast structures.

2.13.3 Joints

Provide tongue-and-groove joints on mating edges of precast components.

Shiplap joints are not allowed. Design joints to firmly interlock adjoining components and to provide waterproof junctions and adequate shear transfer. Seal joints watertight using preformed plastic strip conforming to AASHTO M 198, Type B. Install sealing material in strict accordance with the sealant manufacturer's printed instructions. Provide waterproofing at conduit/duct entrances into structures, and where access frame meets the top slab, provide continuous grout seal.

2.13.4 Electrical Manhole Covers

Manhole vault covers shall be hinged diamond pattern, steel doors rated H-25, with sizes as indicated on the drawings

2.14 CABLE SUPPORTS

2.14.1 Cable Racks

The wall bracket shall be 4 inches by approximately 48 inches 1-1/2 inch by 3/16 inch channel steel, 48 inches long (minimum) in manholes. The

33 71 02 – Page 11 of 19 metal portion of racks shall be zinc-coated after fabrication. Slots for mounting cable rack arms shall be spaced at 8 inch approximately intervals.

2.14.2 Rack Arms

Cable rack arms shall be non-metallic glass-reinforced polymer and shall be of the removable type. Rack arm length shall be a minimum of 8 inches and a maximum of 12 inches.

2.15 CABLE TAGS IN MANHOLES

Provide tags for each power cable located in manholes. The tags shall be polyethylene. Do not provide handwritten letters. The first position on the power cable tag shall denote the voltage. The second through sixth positions on the tag shall identify the circuit. The next to last position shall denote the phase of the circuit and shall include the Greek "phi" symbol. The last position shall denote the cable size. As an example, a tag could have the following designation: "13.8 NAS 1-8(Phase A)500," denoting that the tagged cable is on the 13.8 kV system circuit number NAS 1-8, underground, Phase A, sized at 500 kcmil.

Provide tags of polyethylene that have an average tensile strength of 22 MPa and 2 mm thick (minimum), non-corrosive non-conductive; resistive to acids, alkalis, organic solvents, and salt water; and distortion resistant to 77 degrees C. Provide black polyethylene tag holder. Provide a one-piece nylon, self-locking tie at each end of the cable tag. Ties shall have a minimum loop tensile strength of 750 N. The cable tags shall have black block letters, numbers, and symbols 25 mm high on a yellow background. Letters, numbers, and symbols shall not fall off or change positions regardless of the cable tags' orientation.

2.16 MEDIUM VOLTAGE SECTIONALIZING CABINETS

Cable terminating cabinets shall be hook-stick operable, fiberglass, deadfront construction meeting the requirements of IEEE C57.12.28 for pad-mounted enclosure integrity. Provide cabinets with 15 kV, 600 ampere deadbreak junctions and elbow-type separable deadbreak connectors conforming to the requirements in paragraph SEPARABLE INSULATED CONNECTORS above. Provide three 3-point junctions, hot-dipped galvanized steel mounting plate and cable parking stands, locking mechanism and grounding lugs. Locking mechanism shall be stainless steel with bronze pentahead locking bolt and stainless steel securing hasp for padlocking.

Sectionalizing cabinets shall be Nordic Fiberglass ND-683054-MG-168-X-X or approved equal.

2.17 PROTECTIVE DEVICES AND COORDINATION

Provide protective devices and coordination as specified in Section 26

11 14.00 10 MAIN ELECTRIC SUPPLY STATION AND SUBSTATION.

PART 3 EXECUTION

3.1 INSTALLATION

Install equipment and devices in accordance with the manufacturer's published instructions and with the requirements and recommendations of NFPA 70 and IEEE C2 as applicable. In addition to these requirements, 33 71 02 – Page 12 of 19 install telecommunications in accordance with TIA-758 and RUS Bull 1751F-644.

3.2 CABLE INSPECTION

Prior to installation, each cable reel shall be inspected for correct storage positions, signs of physical damage, and broken end seals. If end seal is broken, remove moisture from cable prior to installation in accordance with the cable manufacturer's recommendations.

3.3 CABLE INSTALLATION PLAN AND PROCEDURE

The Contractor shall obtain from the manufacturer an installation manual or set of instructions which addresses such aspects as cable construction, insulation type, cable diameter, bending radius, cable temperature limits for installation, lubricants, coefficient of friction, conduit cleaning, storage procedures, moisture seals, testing for and purging moisture, maximum allowable pulling tension, and maximum allowable sidewall bearing pressure. The Contractor shall perform pulling calculations and prepare a pulling plan which shall be submitted along with the manufacturer's instructions in accordance with SUBMITTALS. Cable shall be installed strictly in accordance with the cable manufacturer's recommendations and the approved installation plan.

Calculations and pulling plan shall include:

a. Site layout drawing with cable pulls identified in numeric order of expected pulling sequence and direction of cable pull.

b. List of cable installation equipment.

c. Lubricant manufacturer's application instructions.

d. Procedure for resealing cable ends to prevent moisture from entering cable.

e. Cable pulling tension calculations of all cable pulls.

f. Cable percentage conduit fill.

g. Cable sidewall bearing pressure.

h. Cable minimum bend radius.

i. Minimum diameter of pulling wheels used.

j. Cable jam ratio.

k. Maximum allowable pulling tension on each different type and size of conductor.

l. Maximum allowable pulling tension on pulling device.

3.4 NOT USED

3.5 UNDERGROUND STRUCTURE CONSTRUCTION

Provide precast construction as specified herein. Covers for underground structures must fit the frames without undue play. Steel and iron must be formed to shape and size with sharp lines and angles. Castings must be free from warp and blow holes that may impair strength or appearance.

Exposed metal must have a smooth finish and sharp lines and arises.

Coordinate exact underground structure locations with other utilities and finished grading and paving.

3.5.1 Precast Concrete Construction

Set commercial precast structures on 6 inches of level, 90 percent compacted granular fill, 3/4 inch to 1 inch size, extending 12 inches beyond the structure on each side. Compact granular fill by a minimum of four passes with a plate type vibrator. Installation must additionally conform to the manufacturer's instructions.

20Mar2017

3.5.2 Pulling-In Irons

Pulling-in irons shall be hot-dipped galvanized after fabrication.

3.5.3 Cable Racks, Arms and Insulators

Cable racks, arms and insulators must be sufficient to accommodate the cables. Space racks in power manholes not more than 3 feet apart, and provide each manhole wall with a minimum of two racks. Space racks in signal manholes not more than 16 1/2 inches apart with the end rack being no further than 12 inches from the adjacent wall.

3.5.4 Field Painting

Steel covers shall be cleaned of mortar, rust, grease, dirt and other deleterious materials, and given a coat of bituminous paint.

3.6 NOT USED

3.7 UNDERGROUND CONDUIT AND DUCT SYSTEMS

3.7.1 Requirements

Run conduit in straight lines except where a change of direction is necessary. Depth to top of conduits shall be as indicated. Numbers and sizes of ducts shall be as indicated. Ducts shall have a continuous slope downward toward underground structures and away from buildings, laid with a minimum slope of. Depending on the contour of the finished grade, the high-point may be at a terminal, a manhole, a handhole, or between manholes or handholes. Provide ducts with end bells whenever duct lines terminate in structures.

Short-radius manufactured 90-degree duct bends may be used only for pole or equipment risers, unless specifically indicated as acceptable. The minimum manufactured bend radius shall be 48 inches. Otherwise, long sweep bends having a minimum radius of 25 feet shall be used for a change of direction of more than 5 degrees, either horizontally or vertically.

3.7.2 Treatment

Ducts shall be kept clean of concrete, dirt, or foreign substances during construction. Field cuts requiring tapers shall be made with proper tools and match factory tapers. A coupling recommended by the duct manufacturer shall be used whenever an existing duct is connected to a duct of different material or shape. Ducts shall be stored to avoid warping and deterioration with ends sufficiently plugged to prevent entry of any water or solid substances. Ducts shall be thoroughly cleaned before being laid. Ducts shall be stored on a flat surface and protected from the direct rays of the sun.

3.7.3 Conduit Cleaning

As each duct run is completed, for conduit sizes 3 inches and larger, draw a flexible testing mandrel approximately 12 inches long with a diameter less than the inside diameter of the conduit through the conduit. After which, draw a stiff bristle brush through until conduit is clear of particles of earth, sand and gravel; then immediately install conduit plugs. For conduit sizes less than 3 inches, draw a stiff bristle brush

33 71 02 – Page 13 of 19

33 71 02 – Page 14 of 19 through until conduit is clear of particles of earth, sand and gravel;

then immediately install conduit plugs.

3.7.4 Conduit Plugs and Pull Rope

New ducts indicated as being unused or empty must be provided with plugs on each end. Plugs must contain a weephole or screen to allow water drainage. Provide a plastic pull rope having 3 feet of slack at each end of unused or empty ducts.

3.7.5 Jacking and Drilling Under Roads and Structures

Ducts to be installed under paved areas which are not to be disturbed, and under railroad tracks, shall be installed inside directionally bored, steel pipe sleeves as indicated. Duct separators shall be made of steel, plastic, or a combination of these materials placed not farther apart than 4 feet on centers. As ducts are installed in the pipe sleeves, the sleeves shall be completely filled with flowable thermal backfill (FTB) as indicated. Sleeve ends shall be sealed or blocked after FTB installtion to prevent migration of FTB material.

Depths to top of sleeve shall be not less than 60 inches below the bottom of the rails or below the road surfaces.

3.7.6 Ducts Not Installed in Pipe Sleeves

Underground ducts shall be encased in concrete and provided with steel reinforcing. Concrete compressive strength for duct banks shall be 3000 psi. Provide not less than 3 inches clearance from the ducts to each side of the trench. Grade bottom of trench smooth; where rock, soft spots, or sharp-edged materials are encountered, excavate the bottom for an additional 3 inches, fill and tamp level with original bottom with sand or earth free from particles that would be retained on a 1/4 inch sieve.

The rest of the excavation shall be backfilled and compacted in 3 to 6 inch layers.

Depths to top of the ducts shall be not less than 36 inches below finished grade.

Install detectable mylar warning tape above all direct buried conduit runs as indicated and as specified in Section 31 00 00 EARTHWORK.

3.7.7 Multiple Conduits

Separate multiple ducts by a minimum distance of 2.5 inches. Stagger the conduit joints by rows (horizontally) and layers (vertically) to strengthen the duct assembly. Provide plastic duct spacers that interlock vertically and horizontally. Spacer assembly shall consist of base spacers, intermediate spacers, ties, and locking device on top to provide a completely enclosed and locked-in duct bank. Install spacers per manufacturer's instructions, but provide a minimum of two spacer assemblies per 10 feet of conduit assembly.

3.7.8 Duct Bank Connections to Existing Concrete Slabs

For duct bank connections to concrete pads, break an opening in the pad out to the dimensions required and preserve steel in pad. Cut the steel and bend out to tie into the reinforcing of the duct bank envelope. Chip out the opening in the pad to form a key for the duct bank envelope.

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3.8 CABLE PULLING

Test existing duct lines with a mandrel and thoroughly swab out to remove foreign material before pulling cables. Pull cables down grade with the feed-in point at the manhole or buildings of the highest elevation. Use flexible cable feeds to convey cables through manhole opening and into duct runs. Do not exceed the specified cable bending radii when installing cable under any conditions, including turnups into switches, transformers, switchgear, switchboards, and other enclosures. Shielded cables shall have a bending radius of not less than 12 times the overall diameter of the completed cable. If basket-grip type cable-pulling devices are used to pull cable in place, cut off the section of cable under the grip before splicing and terminating. Use lubricants that are specifically recommended by the cable manufacturer for assisting in pulling jacketed cables.

3.9 CABLES IN UNDERGROUND STRUCTURES

Do not install cables utilizing the shortest path between penetrations, but route along those walls providing the longest route and the maximum spare cable lengths. Form cables to closely parallel walls, not to interfere with duct entrances, and support on brackets and cable insulators. Support cable joints in underground structures by racks on each side of the splice. Locate splices to prevent cyclic bending in the spliced sheath. Install cables at middle and bottom of cable racks, leaving top space open for future cables, except as otherwise indicated for existing installations. Provide one spare three-insulator rack arm for each cable rack in each underground structure.

3.10 CABLE TAG INSTALLATION

Install cable tags in each manhole as specified, including each splice.

Tag wire and cable provided by this contract. Install cable tags over the fireproofing, if any, and locate the tags so that they are clearly visible without disturbing any cabling or wiring in the manholes.

3.11 CONDUCTORS INSTALLED IN PARALLEL

Conductors must be grouped such that each conduit of a parallel run contains 1 Phase A conductor, 1 Phase B conductor, 1 Phase C conductor, and 1 neutral conductor (if used), and 1 ground conductor.

3.12 LOW VOLTAGE CABLE SPLICING AND TERMINATING

Make terminations and splices with materials and methods as indicated or specified herein and as designated by the written instructions of the manufacturer. Do not allow the cables to be moved until after the splicing material has completely set. Make splices in underground distribution systems only in accessible locations such as manholes or handholes.

3.13 MEDIUM VOLTAGE CABLE TERMINATIONS

Make terminations in accordance with the written instruction of the termination kit manufacturer.

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3.14 MEDIUM VOLTAGE SEPARABLE CONNECTORS

Provide separable power cable joints suitable for continuous immersion in water. Install separable connectors only in accessible locations in manholes or handholes.

For shielded cables, connect the cable shields on each side of the joint.

Provide a bare copper ground connection brought out in a watertight manner and grounded to the manhole grounding loop.

3.15 CABLE END CAPS

Cable ends must be sealed at all times with coated heat shrinkable end caps. Cables ends must be sealed when the cable is delivered to the job site, while the cable is stored and during installation of the cable. The caps must remain in place until the cable is spliced or terminated.

Sealing compounds and tape are not acceptable substitutes for heat shrinkable end caps. Cable which is not sealed in the specified manner at all times will be rejected.

3.16 FIREPROOFING OF CABLES IN UNDERGROUND STRUCTURES

Fireproof (arc proof) wire and cables which will carry current at 2200 volts or more in underground structures. Tightly wrap strips of fireproofing tape around each cable spirally in half-lapped wrapping.

Install tape in accordance with manufacturer's instructions.

3.17 GROUNDING SYSTEMS

Provide exterior grounding for prefabricated equipment enclosures, pad-mounted transformers, manholes, fencing and other structures as indicated on the drawings.

Provide grounding system in accordance with NFPA 70 and IEEE C2, as indicated on the drawings and as specified herein.

3.17.1 Grounding Electrodes

Provide cone pointed driven ground rods driven full depth plus 12 inches, installed to provide an earth ground of the appropriate value for the particular equipment being grounded. If the indicated ground resistance is not met, an additional ground rod shall be provided and placed not less than 6 feet from the first rod). Should the resultant (combined) resistance exceed the specified resistance, measured not less than 48 hours after rainfall, the Contracting Officer shall be notified immediately.

3.17.2 Grounding Connections

Make grounding connections which are buried or otherwise normally inaccessible, by exothermic weld. Welds shall be made in strict accordance with the weld manufacturer's written recommendations. Welds which are "puffed up" or which show convex surfaces indicating improper cleaning are not acceptable. Mechanical connectors are not required at exothermic welds.or compression connector.

3.17.3 Grounding Conductors

Provide bare grounding conductors, except where installed in conduit with

33 71 02 – Page 17 of 19 associated phase conductors. Ground cable sheaths, cable shields, conduit, and equipment with No. 6 AWG. Ground other noncurrent-carrying metal parts and equipment frames of metal-enclosed equipment. Ground metallic frames and covers of handholes and pull boxes with a braided, copper ground strap with equivalent ampacity of No. 6 AWG.

3.17.4 Manhole Grounding

Loop a 4/0 AWG grounding conductor around the interior perimeter, approximately 12 inches above finished floor. Secure the conductor to the manhole walls at intervals not exceeding 36 inches. Connect the conductor to the manhole grounding electrode with 4/0 AWG conductor. Connect all incoming 4/0 grounding conductors to the ground loop adjacent to the point of entry into the manhole. Bond the ground loop to all cable shields, metal cable racks, and other metal equipment with a minimum 6 AWG conductor.

3.17.5 Fence Grounding

Fences shall be grounded with a ground rod at each fixed gate post, at each corner post, and along the fence line as indicated on the drawings.

Drive ground rods until the top is 12 inches below grade. Attach a 1/0 AWG copper conductor, by exothermic weld to the ground rods and extend underground to the fence post. Lace the conductor vertically as indicated to the uppermost barb wire strand for lightning protection. Fasten using approved bronze compression fittings. Each gate section must be bonded to its gatepost by a 1/8 by one inch flexible braided copper strap and ground post clamps. Clamps must be of the anti-electrolysis type.

3.18 EXCAVATING, BACKFILLING, AND COMPACTING

Provide in accordance with the drawings and Section 31 00 00 EARTHWORK.

3.18.1 Reconditioning of Surfaces

3.18.1.1 Unpaved Surfaces

Restore to their original elevation and condition unpaved surfaces disturbed during installation of duct. Preserve sod and topsoil removed during excavation and reinstall after backfilling is completed. Replace sod that is damaged by sod of quality equal to that removed. When the surface is disturbed in a newly seeded area, re-seed the restored surface with the same quantity and formula of seed as that used in the original seeding, and provide topsoiling, fertilizing, liming, seeding, sodding, sprigging, or mulching. Provide work in accordance with Section 32 92 19

SEEDING.

3.18.1.2 Paving Repairs

Where trenches, pits, or other excavations are made in existing roadways and other areas of pavement where surface treatment of any kind exists , restore such surface treatment or pavement the same thickness and in the same kind as previously existed, except as otherwise specified, and match and tie into the adjacent and surrounding existing surfaces.

3.19 CAST-IN-PLACE CONCRETE

Provide concrete in accordance with Section 03 30 53 MISCELLANEOUS

CAST-IN-PLACE CONCRETE.

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3.19.1 Concrete Slabs (Pads) for Equipment

Unless otherwise indicated, the slab must be at least 8 inches thick, reinforced with a 6 by 6 - W2.9 by W2.9 mesh, placed uniformly 4 inches from the top of the slab. Slab must be placed on a 6 inch thick, well-compacted gravel base. Top of concrete slab must be approximately 4 inches above finished grade with gradual slope for drainage. Edges above grade must have 1/2 inch chamfer. Slab must be of adequate size to project at least 8 inches beyond the equipment.

Stub up conduits, with bushings, 2 inches into cable wells in the concrete pad. Coordinate dimensions of cable wells with transformer cable training areas.

3.19.2 Sealing

When the installation is complete, seal all conduit and other entries into the equipment enclosure with an approved sealing compound. Seals must be of sufficient strength and durability to protect all energized live parts of the equipment from rodents, insects, or other foreign matter.

3.20 FIELD QUALITY CONTROL

Perform Field Acceptance Checks and Tests per the manufacturer's recommendations and in accordance with in NETA ATS.

3.20.1 Medium Voltage Cable Tests

After installation and before the operating test or connection to an existing system, new and reconnected medium-voltage cables shall be given a high potential test. Direct-current voltage shall be applied on each phase conductor of the system by connecting conductors as one terminal and connecting grounds or metallic shieldings or sheaths of the cable as the other terminal for each test. Prior to making the test, the cables shall be isolated by opening applicable protective devices and disconnecting equipment. The test shall be conducted with all splices, connectors, and terminations in place. The method, voltage, length of time, and other characteristics of the test for initial installation shall be for the particular type of cable installed, and shall not exceed the recommendations of IEEE 404 for cable joints and IEEE 48 for cable terminations unless the cable and accessory manufacturers indicate higher voltages are acceptable for testing. Should any cable fail due to a weakness of conductor insulation or due to defects or injuries incidental to the installation or because of improper installation of cable, cable joints, terminations, or other connections, make necessary repairs or replace cables as directed. Repaired or replaced cables shall be retested.

Perform tests after installation of cable and terminators and before terminating to equipment or splicing to existing circuits. Perform resistance measurement, insulation resistance and shield continuity tests listed in NETA ATS prior to performing high potential tests.

3.20.2 Low Voltage Cables

Perform low voltege (600 volt) cable tests as specified in Section 26 20 00

ELECTRICAL DISTRIBUTION SYSTEM

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3.20.3 Grounding System Tests

a. Visual and mechanical inspections per NETA ATS.

Inspect ground system for compliance with contract plans and specifications.

b. Electrical tests per NETA ATS.

Perform ground-impedance measurements utilizing the fall-of-potential method in accordance with IEEE 81. On systems consisting of interconnected ground rods, perform tests after interconnections are complete. On systems consisting of a single ground rod perform tests before any wire is connected. Take measurements in normally dry weather, not less than 48 hours after rainfall. Use a portable ground resistance tester in accordance with manufacturer's instructions to test each ground or group of grounds. The instrument must be equipped with a meter reading directly in ohms or fractions thereof to indicate the ground value of the ground rod or grounding systems under test.

Provide site diagram indicating location of test probes with associated distances, and provide a plot of resistance vs.

distance.

3.20.4 Follow-Up Verification

Upon completion of acceptance checks and tests, show by demonstration in service that circuits and devices are in good operating condition and properly performing the intended function. As an exception to requirements stated elsewhere in the contract, the Contracting Officer must be given 5 working days advance notice of the dates and times of checking and testing.

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