21-APPENDIX F - COT Specifications for Installation of Conduits and Electrical Equipment for Power Delivery.pdf

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APPENDIX F

CITY OF TALLAHASSEE

SPECIFICATIONS FOR THE INSTALLATION

OF CONDUITS AND ELECTRICAL EQUIPMENT

FOR POWER DELIVERY

TABLE OF CONTENTS

Section Description Page

D-1 SCOPE OF WORK

D-2 GENERAL

D-3 MATERIALS SUPPLIED BY OWNER OR CONTRACTOR

D-4 EARTHWORK AND TRENCHING

D-5 DUCTBANKS and CONDUITS

D-6 RISER POLE CONDUITS

D-7 INSPECTION OF WORK

D-8 MANHOLES

D-9 CABLE WARNING TAPE

D-10 INSPECTION OF CONDUITS

D-11 INSTALLATION OF TRANSFORMER PADS, PEDESTALS,

HANDHOLES, PITS, CABINETS & MANHOLES

D-12 INSTALLATION OF STREET AND AREA LIGHTS

D-13 MATERIAL SPECIFICATIONS

D-14 TYPICAL DRAWINGS

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SECTION D-1 SCOPE OF WORK

The work covered by these Specifications consists of, but is not limited to:

(a) Excavation for duct banks and trench lines.

(b) Installation of conduit in duct banks and trench lines.

(c) Installation of manholes.

(d) Installation of termination cabinets and concrete switchgear pits.

(e) Installation of transformer pads and pedestals.

(f) Directional boring

(g) Cased boring

(h) Installation of street and area lights.

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SECTION D-2 GENERAL

This section details the construction procedures that shall be observed for this and all electrical construction projects. The technical specifications contained within this section are comprehensive and all the details provided do not necessarily apply to any one project. It is the responsibility of the Contractor to thoroughly understand all the provisions of this contract document.

All work shall be done in a neat, efficient, safe, and thorough manner by personnel who are skilled, trained, and qualified to perform all work described in this document. All work shall conform to the specifications and accompanying drawings of this document and the Contractor shall provide the highest quality of workmanship.

The Contractor shall staff construction crews with qualified personnel.

Sufficient manpower shall be provided to insure completion of the work without delay. This shall apply to both the Contractor and all subcontractor personnel. The Owner will give the Contractor adequate notice before starting a project to allow time for staffing.

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SECTION D-3 MATERIALS SUPPLIED BY OWNER OR

CONTRACTOR

(a) Materials supplied by the Contractor shall include, but not limited to, conduit, couplings, adapters, elbows, and manholes.

(b) Materials supplied by the Owner shall include, but not limited to, single phase transformer pads, pedestals, terminating cabinets, pits for pad mounted switches, street/area light poles with luminaries, and lighting conductors. Materials supplied by the Owner must be picked up by the Contractor at the City’s Utility Supply Center and transported to the job site. A minimum of 48-hours’ notice to the project manager is required. The Utility Supply Center is located at the intersection of Dupree Street and Municipal Way.

(c) Material Safety Data Sheets shall be provided by the Contractor for all materials, substances, and/or chemicals as required by law.

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SECTION D-4 EARTHWORK AND TRENCHING

(a) The Contractor shall perform all excavation and backfill as directed on the construction drawings or as further specified herein and in accordance with the terms or conditions of all environmental laws, ordinances, permits, etc.

(b) All construction debris shall be removed as soon as practical, and the work site shall be always kept clean. All waste materials, including unsuitable and excess excavated materials shall be properly removed from the work site and handled appropriately in compliance with all environmental laws, ordinances, permits, etc.

(c) All existing suitable material excavated for duct lines, manholes, etc. may be used for backfilling material if it will meet compaction requirements.

(d) The Contractor shall restore all work areas to their original condition. All roads, driveways, parking areas, and sidewalks damaged by the Contractor's operations shall be repaired or replaced to the pre-existing standard or conditions. All vegetation (e.g., sod, shrubbery, trees, etc.) shall be restored to its original condition of growth before the project is accepted by the Owner.

(e) Erosion control materials shall be installed to meet State, County, and City requirements or as directed by the Owner.

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SECTION D-5 DUCT BANK and CONDUITS

(a) Duct Banks as used in these specifications refers to any combination of electric and/or gas conduits installed in a common trench. The configuration, quantity and type of conduits will be specified in construction documents issued to the Contractor.

Any changes from the drawings shall be approved by the Owner and will be shown on as-built drawings submitted by the Contractor upon completion of the job.

(b) At each manhole entrance, the Contractor shall install properly sized belled ends or terminators designed to provide an inner surface flush with the manhole wall that is not abrasive to cable.

(c) In as much as possible, all ducts shall be sloped to drain into manholes.

(d) Reverse curves in any conduit or duct bank section are not permitted.

(e) All conduits shall be joined using appropriate PVC cement and approved adapters or couplings that make clean, smooth internal connections with no variation in internal diameter. All elbows shall be factory made with radii per the Owner’s specifications.

(f) Conduits shall be buried to a minimum cover of 42” from final grade or as specified in construction documents and required permits. In addition to the Owner’s requirements, the Contractor must comply with the most recent addition of the National Electrical Safety Code.

(g) Electric conduits will be thoroughly cleaned to remove all dirt and foreign matter from inside the pipe and a pig pulled through the pipe. A continuous woven polyester fiber measuring pull tape minimum 400 lb. Tensile Strength shall be installed in all conduits and the ends secured.

(h) All conduit terminations shall be turned up into electrical equipment, or as otherwise specified in construction documents, and shall be brought to the surface with an approved 90-degree (90°) elbow and sealed with duct tape or a plastic cap. Only trained and approved journey men will turn up into energized electrical equipment.

(i) Steel conduit threads shall be treated with a rust primer/inhibitor.

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(j) Duct bank conduits installed in an underground (URD) subdivision shall be installed per the Tallahassee Area Utility Placement Accommodations Guide or as directed by the Owner.

(k) The Contractor shall keep accurate as-built records of all underground duct banks (See Chapter A, Section A-21 “AS- BUILT DRAWINGS AND GPS”). These records shall include duct locations with dimensions (as required or needed) from right-of-way, curb, or other permanent markers, final depth, and any changes to construction documents. Bore log shall be submitted for all directional drilled conduits. Subdivision as-builts plans must show any deviations from the drawing and the number of 90-degree elbows in each run. These records shall be submitted to the Owner upon completion of the project.

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SECTION D-6 RISER POLE CONDUITS

All riser pole conduit shall be turned up at the base of the pole under the primary conductors, or as otherwise specified in construction documents or as instructed by Owner and shall be brought to the surface with an approved 90-degree elbow and sealed with duct tape or a plastic cap at 3” above finished grade. At no time are 90-degree elbows cut and must be buried sufficiently to meet this stub up requirement.

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SECTION D-7 INSPECTION OF WORK

Conduits shall be inspected by a COT representative or inspector for proper depth and conformance to construction specifications before backfilling the trench. The Contractor shall notify the project manager or inspector a minimum of one day before beginning construction.

Inspectors will verify that conduits, manholes, termination cabinets, transformer pads, pedestals, and street/area lights are installed per specifications and standard construction practices. All work not in compliance will be redone at the Contractor’s expense.

Inspectors will verify lengths and quantities of items for unit pricing billing.

A vendor performance evaluation form may be used to periodically document the Contractor’s quality of work performed, materials used, adherence to specifications and working relationship with COT staff and public citizens.

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SECTION D-8 MANHOLES

(a) Precast manholes will be used and must conform to the Owner approved specification as shown in Sections D-13 – Material Specifications and D-14 - Typical Drawings.

(b) The Contractor shall install collars, rings, and covers on all manholes. The ring and cover shall be installed so that it is flush with the surrounding final grade of roadways, sidewalks, and soil.

(c) Manholes will be supplied with precast conduit terminators or bell ends in the walls as required by the specifications herein or construction plans. As needed or directed, conduits may be neatly installed in knockout (or thin wall) windows and grouted to seal all open spaces around the conduits.

(d) Manholes shall be installed on twelve inches (12”) of clean sand and leveled so that water drains to the sump cavity. Clean soil shall be used to fill around the sides leaving no voids. Soil around the manhole shall be compacted to avoid settling.

(e) All manholes shall be cleaned and free of any construction debris before installation will be excepted by the owner.

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SECTION D-9 CABLE WARNING TAPE

A six-inch (6") wide, standard red (APWA recommended color) polyethylene plastic warning tape, marked with "ELECTRIC LINE BURIED BELOW" shall be buried in the center of the trench twelve inches (12") above the conduits and along the entire length of the duct line. The Contractor shall take special care that the cable warning tape is placed consistently at the required depth and centered over the duct bank conduits.

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SECTION D-10 INSPECTION OF CONDUITS

At the Owner’s discretion, conduits will be inspected for proper depth and conformance to construction specifications before backfilling. At no time shall 90-degree elbows be cut to obtain proper burial depth at stub ups.

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SECTION D-11 INSTALLATION OF TRANSFORMER PADS,

PEDESTALS, HANDHOLES, PITS, CABINETS AND

MANHOLES

(a) All transformer pads, pedestals, handholes, termination cabinets, pre-cast concrete switchgear pits, and manholes shall be installed level on tamped earth at finished grade. Finished grade shall be provided by the Owner or Developer. Equipment shall be oriented according to construction drawings. Should equipment settle or become un-level due to inadequate tamping, the Contractor shall re-install and level the equipment at his/her expense.

(b) All excess backfill material shall be disposed of in a manner that conforms to all applicable environmental laws, ordinances, and permits.

(c) Refer to Sections D-13 and D-14 for material specifications and typical construction drawings.

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SECTION D-12 INSTALLATION OF STREET AND AREA LIGHTS

All street and area light materials will be furnished by the Owner.

Poles, fixtures, and other components must be handled with care to prevent damage to the components and coatings.

The Contractor shall install wires in the pole from a pedestal or transformer to the ballast/driver and make proper connections in the ballast/driver. All arms, washers, locknuts, and other hardware shall be assembled, securely tightened, and installed per the manufacturer’s specifications.

The Contractor shall field drill poles as required for a complete installation.

Poles shall be set to proper depth as indicated on the construction drawings or manufacturer’s specifications. Poles shall be plumbed, and holes properly tamped to prevent leaning.

Excess soil shall be removed from the construction site.

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SECTION D-13 MATERIAL SPECIFICATIONS

1. STEEL CONDUIT:

All steel conduits shall meet the requirements of ANSI C80.1-2020 "Specification for Rigid Steel Conduit, Zinc Coated" or latest revision and except where otherwise indicated on the Drawings, rigid steel conduit elbows and long radius bends shall be hot-dip galvanized.

2. PVC CONDUIT:

PVC conduits shall be direct burial nonmetallic rigid plastic pipe in nominal ten- or twenty-foot lengths. Pipe shall be a high impact, Schedule 40, heavy wall type, rated for 90 degrees Celsius (90° C) wiring, and manufactured from virgin un-plasticized polyvinyl chloride resin. Pipe and fittings shall conform to ANSI/NEMA TC2/TC3-2020, ANSI/UL 651-2011, and ANSI/UL 514 (latest editions), in accordance with Article 347 of the current edition of the National Electric Code (ANSI/NFPA 70) for underground and exposed use.

(a) Conduit shall be continuously marked (legibly and permanently) indicating size, type, schedule, temperature rating, and the name or trademark of the manufacturer.

(b) All PVC duct joints, both factory and field, shall be made by a solvent joining process forming a permanent watertight connection with an ultimate strength equal to that of the conduit.

The solvent shall be of a type as specified or recommended by the conduit or duct manufacturer. To form a proper bond, the solvent shall be properly applied as specified or recommended by the conduit or duct manufacturer.

(c) PVC conduit shall have the following strength requirements:

(i). A minimum tensile strength of 5500 lb./sq. inch at 78 degrees Fahrenheit (78° F).

(ii). A minimum flexural strength of 11,000 lb./sq. inch.

(iii). A minimum compression strength of 8,600 lb./sq. inch.

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(d) PVC conduit shall have the following nominal dimensions:

Size I.D. Wall Thickness 1" 1.049" 0.133" 2' 2.067 0.154 3" 3.068" 0.216" 4" 4.026" 0.237" 6" 6.065" 0.280"

(e) PVC conduit fittings shall meet the following requirements:

(i). All fittings shall be supplied with a slip type coupling for connection to the conduit with solvent cement.

(ii). All bends shall be of the long sweeping radius type unless otherwise specified.

3. NON-METALLIC CONTINUOUS CONDUIT:

These requirements cover non-metallic smooth wall, coilable, continuous length conduit with a circular cross section. The conduit is to be made of High-Density Polyethylene (HDPE). The conduit is to be suitable for direct bury installations, or encasement in concrete.

(a) Manufacturer of the duct shall be registered as an ISO9000 company

(b) The duct shall be manufactured from virgin high density polyethylene. The duct shall be capable of being coiled (on reels) in continuous lengths, transported, stored outdoors and subsequently uncoiled for installation without affecting its properties or performance. Color of the conduit shall be gray and match as close as possible to the gray of Schedule 40 PVC Conduit.

(c) The duct shall be free of visible cracks, holes, or other physical defects that would degrade its performance. It shall be uniform in respect to overall dimensions, color, density, and thickness.

(d) The duct shall perform in underground installations in ambient temperature range of minus 30°F to 130°F without degradation of material properties. It shall be possible to bend the duct to a minimum supported radius of 10 diameters.

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(e) The duct shall be shipped from the factory with each end capped with plastic caps to prevent the entrance of dirt and/or moisture to the duct.

(f) The duct shall have UV light stabilizer that will protect the duct for a minimum of 12 months in direct sunlight.

(g) The duct shall have a durable identification showing the name or trademark of the manufacturer, duct size, sequential footage markings and date of manufacture. Also, at regular intervals, the duct shall be printed with words “Caution-High Voltage”.

(h) Dimensions of the duct shall conform to ASTM D-3035 for Schedule 40.

(i) Tolerances for the duct shall be as follows:

Nominal Conduit Size

Outside Diameter

Min. Wall Thickness

Out of Roundness

(inches) (inches) (inches) (inches)

1” 1.315 ± 0.005 0.133 ± 0.020 ± 0.025

2” 2.375 ± 0.006 0.154 ± 0.020 ± 0.035

3” 3.500 ± 0.008 0.216 ± 0.020 ± 0.040

(j) Couplings used shall be air and watertight.

(k) The duct shall be resistant to harsh chemicals and/or protected against degradation due to oxidation or general corrosion.

(l) When tested in accordance with ASTM standards, the duct shall have the following minimum characteristics:

Density 0.946 g/cc

Deflection Temperature 156°F

Brittleness Temperature <-103°F

Melt Index 0.25 g/10 min

Tensile Yield Strength 3,300 psi

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Flexural Modulus 120,000 psi

Hardness 61

Environmental Stress Crack Resistance >1,000 hrs.

4. BORE-GARD:

Bore-Gard conduits shall be direct burial nonmetallic rigid plastic pipe in nominal ten- or twenty-foot lengths. Pipe shall be a high impact, Schedule 40, heavy wall type, rated for 90 degrees Celsius (90° C) wiring, and manufactured from virgin un-plasticized polyvinyl chloride resin. Pipe and fittings shall conform to ANSI/NEMA TC2/TC3-2020, ANSI/UL 651- 2011, and ANSI/UL 514 (latest editions), in accordance with Article 347 of the current edition of the National Electric Code (ANSI/NFPA 70) for underground and exposed use.

(a) Bore-Gard shall be used for all 4”, 5”, and 6” bores.

(b) Each length of pipe will incorporate a seal, locking ring, end caps, and a bell.

(c) Each conduit section will be belled on one end with two grooves machined into the inside diameter (ID) of the bell and with a groove and chamfer machined into the outside (OD) of the spigot end.

(d) Conduit will contain a lubricated triple-lobed gasket factory installed in the bell end of pipe to seal out ground water, boring lubricants, and other contaminants from entering pipe. Conduit will contain air pressure of up to 80 psi at the tightest bend radius of 65 feet.

(e) Maximum bend radius for conduit will be 65 feet.

(f) Nylon locking straps will secure the connection between two pieces of conduit without the need of cement.

(g) Conduit will be grey in color and sunlight resistant.

(h) Conduit shall accept standard Schedule 40 fittings and be easily attached using standard PVC cement.

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5. MANHOLES:

(a) Manholes shall be purchased according to specifications and installed at the designated locations as shown on the accompanying drawings.

(b) All pre-cast concrete manholes shall be installed on a minimum of 12 in. of well-tamped/compacted clean, uniform grain, select fill sand, and shall be level and oriented as shown by the accompanying plans. Manhole trenches shall be backfilled as specified herein.

(c) The Contractor shall provide and install necks, rings, collars, and lids for the manholes. The lid shall be installed so that it is even or flush with final grade and does not create a safety hazard.

(d) Conduits shall be routed into manholes as to avoid excessively acute bends.

(e) The manhole depth will be dependent upon the location of existing utilities or obstructions in the immediate excavation area but must have a minimum cover of twelve inches (12 in.).

(f) Approved Manufacturers: Oldcastle, Southern Precast Inc., and Hanson Pipe & Products, Inc.

(g) Manhole cover to be constructed of cast iron, with the word "Electric" included and is detailed on the attached contract document drawings. The ring and cover shall be U.S. Foundry & MFG. Corp. Model USF 672-AF-M (no substitutes) as shown on the attached drawings.

(h) Pre-cast manholes will be used and shall be designed as per the contract documents. Where the pre-cast manhole does not include a neck, the neck shall be constructed by use of pre-cast collars, cement, etc.

(i) The Contractor shall submit, for approval, the manufacturer's design drawings plus signed and sealed load calculations by a registered engineer (State of Florida) for each specific “type” of manhole with the Bill of Materials.

(j) Manholes shall be constructed in accordance with ASTM C478- 02a (or latest revision) "Specifications for Pre-Cast Reinforced Concrete Manholes" and ACI-318 (latest revision) “Building Code Requirements for Structural Concrete”.

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(k) Design Loading shall be for H-20 as specified in the A.A.S.H.T.O. Standard Specifications for Highway Bridges and in accordance with the National Electric Safety Code (ANSI C2- 2017, or latest revision). Design loading shall include dead load, live load, impact, loads due to water table, and any other loads that may be placed up on the structure. Live load shall be that which produces the maximum shear and bending moments in the structure. The designed wheel load shall be for 16 kips. An impact factor of 1.3 shall apply.

(l) Concrete shall have a minimum compressive strength of 4000 P.S.I. at 28 days.

(m) All aggregates shall be free of deleterious substance and shall conform to the specifications as covered by ASTM C-33.

(n) All cement shall be Portland cement that conforms to ASTM C- 150, type 1.

(o) As a minimum, steel reinforcing shall be in accordance with the attached drawings (if shown). Where the applicable sections of ASTM Grade 60 and ASTM Grade 40 are more stringent, these sections shall take precedence. The welded wire fabric shall be in accordance with ASTM A185.

(p) Dimensions shall be according to the attached contract document drawings.

(q) Manhole opening shall be as indicated in the attached contract document drawings.

(r) The minimum wall thickness of all sides and top shall be as indicated in the attached contract document drawings.

(s) Manholes shall be built with knockouts or thin wall sections that have a maximum wall indentation of 2” and sized to fit the proposed duct-bank arrangement. The knockouts shall be located as shown on the attached drawings. Where applicable, the manhole manufacturer shall pre-cast conduit bell end (a.k.a.

end bell) inserts in the thin wall sections as shown on the accompanying drawings to match the proposed duct size and arrangement.

(t) Manholes shall include an 18 in. x 18 in. x 6 in. cast-in-place rectangular sump recess with a 1/2 in. (minimum) steel grate

Chapter D Page 21 cover (19 in. x 19 in.) as shown on the attached contract document drawings.

(u) Pulling Irons shall be supplied on the interior of the manhole in the roof and floor as shown on the attached contract document drawings.

(v) The manhole sections shall be supplied with lifting lugs located at a minimum of four different corners of each manhole. If the weight is such that this is insufficient to adequately handle the manhole sections, the manufacturer will furnish additional lifting lugs to safely handle these items.

(w) The manufacturer shall supply a sealant to waterproof the seal between the sections of the manhole as they are assembled.

(x) The manufacturer shall provide a 1 in. hole pre-cast through the bottom of the manhole. The hole shall have 1 in. Schedule 40 PVC conduit sleeve installed per the attached contract document drawings.

(y) The manufacturer shall cast a 1.5 in. x 3.5 in. square groove in the manhole floor from the sump recess to a wall as shown on the attached contract document drawings.

(z) The manufacturer will deliver the manholes by truck and shall provide sufficient labor and equipment to unload the manholes at the construction site.

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SECTION D-14 TYPICAL DRAWINGS

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Wood Pole with a Wood Pole with a Wood Pole with a Cobrahead Fixture Flood Fixture Secondary Light Riser

18’ Fiberglass Pole with a 30’ or 45’ Fiberglass Pole with a 100W Decorative Fixture Cobrahead Fixture