Electrical Base Stds 2007.pdf

Page 1 of 17 Revised: 27-Oct-06

BASE STANDARDS FOR BUILDING/UTILITY ELECTRICAL DISTRIBUTION

SYSTEMS/TELE-DATA COMMUNICATIONS

Tinker Air Force Base, Oklahoma

JAN 2007

(a) General:

1.1 References

(a) As a minimum, all electrical work performed on Tinker AFB shall conform to the latest edition of the following codes/standards:

(1) NFPA 70, National Electrical Code (NEC)

(2) IEEE C2, National Electric Safety Code (NESC)

(3) UFC 3-520-01, Interior Electrical Systems

(4) UFC 4-010-01, DOD Antiterrorism Standards for Buildings

(5) UFC 3-530-01AN Interior and Exterior Lighting and Controls

(6) National Electrical Installation Standards (NEIS)

• NECA 1, Good Workmanship in Electrical Contracting

• NECA 90, Commissioning Building Electrical Systems

• NECA 101, Installing Steel Conduits (Rigid, IMC, EMT)

• NECA/NEMA 105, Installing Metal Cable Tray Systems

• NECA 111, Installing Nonmetallic Raceways (RNC, ENT, LFNC)

• NECA/NACMA 120, Installing Armored Cable (AC) and Metal-Clad Cable(MC)

• NECA 200, Temporary Electric Power

• NECA 202, Installing Industrial Heat Tracing Systems

• NECA 230, Electric Motors and Motor Controllers

• NECA/FOA 301, Installing and Testing Fiber Optic Cables

• NECA 305, Standard for Fire Alarm System Job Practices

• NECA 331, Standard for Building and Service Entrance Grounding and Bonding

• NECA 400, Installing and Maintaining Switchboards

• NECA 402, Installing and Maintaining Motor Control Centers

• NECA/EGSA 404, Installing Generator Sets

• NECA 405, Installing and Commissioning Interconnected Generation Systems

• NECA 407, Installing Panel boards

• NECA 408, Installing and Maintaining Busways

• NECA 409, Installing and Maintaining Dry-Type Transformers

• NECA 410, Installing and Maintaining Liquid-Filled Transformers

• NECA 430, Standard for Installing Medium-Voltage Metal-Clad Switchgear

• NECA/IESNA 500, Installing Indoor Commercial Lighting Systems

• NECA/IESNA 501, Installing Exterior Lighting Systems

• NECA/IESNA 502, Installing Industrial Lighting Systems

• NECA/BICSI 568, Installing Commercial Building Telecommunications Cabling

• NECA/MACSCB 600, Installing and Maintaining Medium-Voltage Cable

• NECA/NEMA 605, Installing Underground Nonmetallic Utility Duct

Page 2 of 17 Revised: 27-Oct-06

1.2 Design

(a) As a minimum, all electrical design shall conform to the latest edition of the above codes/standards.

(b) To the extent possible, Unified Facility Guide Specifications (UFGS) and standard detail shall be utilized in the design. All specifications and general notes shall have the non-applicable parts edited.

(c) Existing as-built drawings may be used as guidelines (if available), but “information must be verified by field investigation”. The Designer shall be responsible for the verification of all dimensions, measurements, and location of existing facilities, utilities, equipment and other existing conditions that may affect the design.

(d) The following items shall be taken into consideration and included as part of the design analysis:

(1) Exterior – Primary circuit availability and location.

(2) Exterior - Primary circuit loading (generally, existing primary loops at TAFB are designed for loads of 400A or less. Future loops may be designed for higher capacities as long as analysis shows that existing switchgear/substations can support the higher requirement).

(3) Existing equipment age and condition

(4) Transformer/panel board/switchgear loading (existing and future).

(5) Non-linear loads (Fluorescent lighting, computers, variable frequency drives, etc)

(6) Energy Analysis

(e) All new building wiring systems shall consider using 480/277V unless uneconomical to accomplish. Designer shall make recommendations of building voltages at the design analysis phase of each project.

1.3 Installation

(a) As a minimum, all electrical installations shall conform to the latest edition of the above codes/standards.

(b) NEIS shall be used for quality and reliability standards for construction. These criteria will be used to define acceptable industry practices for installations.

(c) Only journeymen electricians (state licensed or minimum 12,000 hours verifiable experience) or registered apprentices under the direct supervision of journeymen will be permitted to install, alter, or repair electrical systems.

(d) Material and equipment shall be a standard product of a manufacturer regularly engaged in the manufacture of the product and shall essentially duplicate items that have been in satisfactory use for at least 2 years prior to bid opening. All materials in the same category shall be by a single manufacturer. Equipment from discontinued product lines shall not be accepted.

(e) All conductors shall be color-coded at panel boards, switchboard, terminations, junction boxes, manholes, hand holes, etc. Factory color-coding of insulation is preferred; however, colored tape may be used on conductors #6 and larger. A green equipment-grounding conductor shall be installed with all branch circuits. Circuit conductors shall be color coded as follows:

Page 3 of 17 Revised: 27-Oct-06

(1) All Configurations: Equipment Grounding Conductor, Green. (Exception: Where an isolated ground is required the isolated ground shall be identified as green with a yellow stripe.)

(2) 120V, 2-wire circuit: Grounded conductor (neutral), White; Ungrounded leg, Black.

(3) 240/120V, 1-phase, 3-wire circuit: Grounded conductor (neutral), White; One hot leg, Black; One hot leg; Red.

(4) 208Y/120V, 3-phase, 4-wire circuit: Grounded conductor (neutral), White; Phase A, Black; Phase B, Red; Phase C, Blue.

(5) 208V, 3-Phase, 3-wire circuit: Phase A, Black; Phase B, Red; Phase C, Blue.

(6) 480Y/277V, 3-phase, 4-wire circuit: Grounded conductor (neutral), Gray; Phase A, Brown; Phase B, Orange; Phase C, Yellow.

(7) 480V, 3-phase, 3-wire circuit: Phase A, Brown; Phase B, Orange; Phase C, Yellow.

1.4 Metering

1.4.1 Watt-Hour Metering

(a) Watt-hour meters shall be installed on all facilities requiring new services (Note: watt-hour metering will not be required where digital meters as specified below are provided).

(b) Watt-hour meter shall be surface-mounted, electronic-programmable type, with LCD display.

(c) Meter will display readings for usage (kWh), demand (kW), and peak demand (including date/time of peak demand).

(d) Meter shall be provided with a self-contained backup system to maintain memory and display during power failures.

(e) Meter shall be provided with a modular connector(s) to provide interfacing for:

(1) Automatic Meter Reading (AMR)

(2) Pulse modules

(3) Analog signal modules

(4) Energy control modules

(5) Instantaneous demand displays

(f) Meter shall include necessary hardware for remote monitoring by an energy monitoring and control system.

1.4.2 Digital Metering

(a) Digital metering shall be installed in each switchboard or switchboard section (for double ended applications). Monitors may also be remote mounted. Center of the monitor shall be mounted as close to eye level as possible, but in no instance more than 80” A.F.F.

(b) Metering shall conform to ANSI C12.1, except numbered terminal wiring sequence and case size may be the manufacturer’s standard.

(c) All setup parameters required by the electronic monitor shall be stored in non-volatile memory and retained in the event of a control power interruption. Any battery or other device used to provide non-volatile memory shall be user serviceable from the front of the monitor and servicing shall not require removing the monitor from the gear in which it is mounted.

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(d) The monitor shall maintain in non-volatile memory maximum and minimum values for each of the instantaneous values reported as well as the time and date that the minimum or maximum was set.

(e) The monitor shall be equipped with the capability for future data communications to a central monitoring station.

(f) All necessary instrument transformers (CTs/PTs) shall be provided in the switchgear.

(g) The monitor shall be listed according to UL 508, and have an over-current withstand rating of 500 amps for 1 second.

(h) The monitor shall provide true RMS metered values accurate for distorted, non-sinusoidal wave-shapes beyond the 30th harmonic (fundamental of 60 hertz).

(i) The monitor shall be accurate to ± 0.25% of reading ± 0.05% of full scale for voltage and current metering, and ±1.0% for all power and energy functions. The accuracy shall be maintained for both light and full loads. No annual re-calibration by users shall be required to maintain these accuracy’s.

(j) Voltage and current for all phases shall be sampled simultaneously to assure high accuracy in conditions of low power factor or large waveform distortions (harmonics).

(k) The monitor shall be equipped with an integral, continuous duty, long-life display to provide local access to the following metered quantities as well as the minimum and maximum value since last reset of each quantity:

(1) Current (RMS), per phase and neutral

(2) Voltage, phase-to-phase and phase-to-neutral

(3) Real power, per phase and 3-phase total

(4) Reactive power, per phase and 3-phase total

(5) Apparent power, per phase and 3-phase total

(6) Power factor, 3-phase total and per phase

(7) Frequency

(8) Demand current, per phase and three phase average

(9) Demand real power, three phase

(10) Demand apparent power, three phase

(11) Accumulated Energy, (MWH and MVARH)

(12) THD, current and voltage, per phase

(13) K-factor, current, per phase

(l) The following demand readings shall be reported by the monitor:

(1) Average demand current, per phase

(2) Peak demand current, per phase

(3) Average demand for real power, reactive power, and apparent power

(4) Predicted demand for real power, reactive power, and apparent power

(5) Peak demand for real power, reactive power, and apparent power

(6) The default demand calculations method shall be 15-minute sliding window.

(m) Installation contractor shall be required to provide documentation verifying proper meter calibration and verifying proper operation/readings during commissioning of the equipment.

(n) A digital meter (Volt, Amp, Demand Volt, Demand Amp) shall be installed on breakers larger than 800 Amp.

2. Exterior Electrical

Page 5 of 17 Revised: 27-Oct-06

2.1 General

(a) All exterior pad mounted equipment shall be painted base standard “Cleveland Brown” (ICI #317) or approved equal.

(b) All exterior pad mounted equipment shall have permanently affixed identification labels.

Labels shall be weather resistant, engraved, metal or phenolic plastic. Labels shall indicate equipment identification, rating, and circuit designation. Information for equipment identification and circuit designation will be provided by Base Civil Engineering.

(c) All exterior underground cables shall have permanent identification tag installed at each manhole, hand hole, pull box, or termination. Labels shall be weather resistant, engraved, metal or phenolic plastic. Labels shall indicate at a minimum the circuit designation and To/From information. Information for circuit designation shall be provided by Base Civil Engineering.

(d) Disconnects for mechanical and other equipment on the outside of buildings shall be served from the rear (through the wall feeder) or bottom (below grade feeder).

(e) All bussing in electrical equipment shall be copper.

2.2 Underground Electrical Distribution

2.2.1 Concrete Encased Duct Bank

(a) Concrete encased conduits shall have minimum spacing between conduits as specified by the NEC and at least 3 inches of concrete protecting them on top, bottom, and sides.

(b) The top of the concrete encasement shall be at least 30” below finished grade level at all points.

(c) All concrete encased duct banks shall have a 1/0 bare copper counterpoise system installed immediately above the duct bank (6” or less) and continuous the length of the duct bank..

Counterpoise shall be connected to a ¾” x 10’ ground rod in each manhole and at each transformer and switching-station installation (including primary substations). Where duct bank terminates at a pole riser, counterpoise shall be connected to a ¾” x 10’ ground rod and bonded to the pole grounding system.

2.2.2 Direct Buried Conduit

(a) For 600V and below, where direct buried conduit is specified in the project documents, direct buried conduit shall be Schedule-80 PVC conduit a minimum of 30” below grade. Direct buried conduit supplying individual branch circuits such as exterior lighting or power receptacles may be Schedule 40 PVC conduit installed at a minimum depth of 24” below grade. All conduit that extends from excavations above finished grade, shall be galvanized rigid conduit or PVC coated galvanized rigid conduit, starting from minimum depth as specified and include the 90 deg. Elbow.

2.2.3 All utility road and driveway crossings shall be bored and sleeved with single schedule 80 PVC or ¼”-wall steel sleeve. Roadways and driveways shall not be crossed by open cut unless approved. Wherever boring is impractical, street crossings shall be limited to three (3) days maximum (including trenching, compaction, and replacement of existing pavements).

Contractor shall provide steel matting sufficient to carry the traffic load of the excavated area.

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2.2.4 All electrical concrete manholes shall be 7’x 7’ x 7’ (minimum inside dimension). Maximum spacing shall be 450 feet on centers. Cable Support Systems located in manholes shall be constructed of a nonconductive material. All cables in manholes shall be identified with a non-conductive tag & permanent marker, tags shall identify circuit at each point where the cable either enters or exits the manhole.

2.2.5 All underground electrical and communication installations (conduit, duct bank, etc.) shall be identified using marking tape. Tape shall have the following characteristics:

(a) 5-mil plastic

(b) Brightly colored (electric – red; communication – orange)

(c) Not be less than 3 inches in width

(d) Suitably inscribed at not more than 10 feet on centers

(e) Continuous metallic backing and a corrosion resistant 1-mil metallic foil core to permit easy location of duct line.

Tape shall be placed 12-inches below finished grade.

2.3 Medium Voltage Distribution

2.3.1 General

(a) Install distribution conductors in underground ducts in lieu of direct burial and/or overhead.

(b) Air vacuum type switches are required in lieu of oil insulated. SF6 switches may be used in areas where equipment size is a concern with Base CE approval.

2.3.2 Primary Loop Feeders

(a) Medium voltage cable shall be (minimum) 15kV-500 kcmil copper, XLP/XLPE or EPR, with 100/133% insulation, wire shield or separator tape, and an ozone/sunlight resistant PVC jacket. Concentric neutral cable shall not be used.

(b) Grounded conductor (neutral) shall be (minimum) 600V- #4/0 AWG copper.

(c) Conductors shall be protected by a (minimum) 5-inch diameter concrete-encased

Schedule-40 or type-EB PVC conduit.

(d) Cables shall be routed and racked inside manhole to allow the longest possible length of spare cable in each manhole possible (minimum of 1 full loop around the interior of the manhole).

2.3.3 Primary Radial Feeders

(a) Medium voltage cable shall be (minimum) 15kV- #2 AWG copper, XLP/XLPE or EPR, with 100/133% insulation, wire shield, separator tape, and an ozone/sunlight resistant PVC jacket.

Concentric neutral cable shall not be used.

(b) Grounded conductor (neutral) shall be (minimum) 600V- #2 AWG.

(c) Conductors shall be protected by a minimum 5” diameter concrete-encased Schedule-40 or type-EB PVC conduit.

(d) Cables shall be routed and racked inside manhole to allow the longest possible length of spare cable in each manhole possible.

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2.3.4 Medium Voltage Cable Terminations and Splices

(a) Terminations and splices shall be of the preformed type only, tape type are not acceptable.

(b) All cable splices and terminations shall be installed in accordance with the manufacturer’s specifications.

2.3.5 Medium Voltage Cable Testing

(a) Testing requirements shall be coordinated during design of each project.

(b) All new cable shall be hi-pot tested in accordance with manufacturer’s recommendations, but not to exceed 3-times the cable voltage rating. Testing shall be performed in accordance with the methodology described in the applicable IEEE, ICEA, or AEIC standards.

(c) Existing cable being reused, or spliced into, shall be hi-pot tested at its rated voltage. Testing shall be performed in accordance with the methodology described in the applicable IEEE, ICEA, or AEIC standards.

(d) All hi-pot testing must be coordinated with exterior electric in advance.

(e) Hi-pot test data and results shall be documented and signed by the testing technician and the job supervisor. Copies of the test data/certification/results shall be provided to the Base Civil Engineering office for review.

2.4 Low Voltage Distribution

(a) Conductors shall be 600V-rated copper, with thermoplastic insulation (unless specified otherwise on the design plans).

(b) Conductors to be installed in wet locations must be UL listed for the application.

(c) Conductors shall be sized as appropriate for the application.

(d) Feeders shall be installed without splices.

(e) No splicing into existing circuits without CE approval.

2.5 Transformers

(a) New building transformers shall be either unit substation or fully enclosed pad mounted (in lieu of pole mounted).

(b) Unit Substation: Based on existing site conditions and availability of medium-voltage feeders, transformers shall be either:

(1) Radial type fed from a 15kV-sectionalizing (S&C or equal) switch with integral single, metal-enclosed, fused, load-interrupter switch.

(2) Loop-fed type with integral dual, metal-enclosed, fused, load-interrupter switches.

(3) Incoming section shall include surge arrestors.

(4) Outgoing sections shall be as specified in the project definition.

(5) Gear shall have copper bussing and windings.

(c) Pad-Mounted: Pad mounted transformers shall meet the following criteria:

(1) Transformers shall be loop-feed type.

(2) Transformers shall be dead front type with separable load break connectors, surge arrestors, and parking bushings.

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(3) Transformers shall have load break switches and primary fuses mounted inside the enclosure. Transformer fusing shall be oil-immersed, bayonet type, overload fuses in series with partial range current-limiting fuses. Fuses shall be interlocked with primary load break switches.

(4) Transformers shall have copper windings.

(5) Transformers shall have, as a minimum, four (4) 2.5% taps (2+, 2- nominal voltage).

(d) Generally, transformers shall be fed from a 15kV-sectionalizing (S&C or equal) switch.

Transformer primary feeders shall not be t-spliced into existing feeders in manholes or hand holes.

(e) The main primary (15KV) feeder shall be concrete encased in underground duct bank.

(f) Transformer output voltage shall be verified at commissioning of system and load taps adjusted to provide voltage +/- 2.5% of nominal.

(g) Oil filled transformers shall utilize Mineral Insulating Oil per ASTM D3487-00 and shall be equipped with relief valves, and if pad mounted, a means of sampling the oil.

(h) Oil filled transformer installations shall comply with IEEE 979 regarding fire protection. Oil filled transformers may be physically separated from building surfaces or other oil filled transformers or may be separated by appropriate fire rated barriers. Space limitations may dictate the method of fire protection employed.

(i) Field-testing, pre-energization, or manufacturer’s field service shall be required unless specifically stated in project definition.

2.6 Communications

(a) Contractor will provide dedicated two 5-inch conduits, with 4-1” inner ducts installed and a pull wire for each inner duct or as defined in the project design.

(b) Contractor shall follow all applicable NEC code requirements in regards to communications line installations.

2.7 Auxiliary Power/Generators

(a) Provide quick disconnect and three-way (manual transfer) switches on outside of facility for portable generator connection when authorized by AFR 91-4 or when deemed prudent based on the function performed in the facility.

(b) Provide combination bypass and automatic transfer switches for each generator installation.

(c) Emergency generator installations shall be placed in existing equipment yards or provided with suitable enclosure (fenced yard) to hide from public view. Where suitable enclosure cannot be provided, generators shall be factory painted a base standard color as determined by Tinker AFB Architects and may not be a manufacturer’s standard color.

2.8 Exterior Lighting – Parking Lot, Roadway, Fitness Trails, and Walking Paths

(a) Use aluminum or steel poles in lieu of wood poles wherever possible, taking into consideration the economics and aesthetics.

(b) All power and light poles, steel support structures and their foundations, shall be designed for NESC Heavy Loading District conditions and 100 mph wind loads on bare structure face.

(c) All parking/roadway lighting fixtures shall be supplied with high-pressure sodium “ECO” lamps. Mercury vapor lamps shall not be used.

(d) Roadway lighting in residential areas may utilize metal (MH) lamps.

Page 9 of 17 Revised: 27-Oct-06

(e) Unless specifically deleted in project requirements (such as for security lighting) photoelectric controls or timers shall be used on all exterior lighting.

(f) Where a ground rod is specified to be installed at light poles, the connection of the bonding conductor at the ground rod, and at the concrete encased reinforcement of the base, shall be either exothermic weld process, or irreversible compression connector listed for the purpose.

Mechanical lugs or connections shall not be allowed.

(g) 100 hours of “Burn-in time” shall be performed before acceptance and final inspection.

3. Interior Electrical:

3.1 General

(a) Riser and one-line diagrams shall show vertical and electrical relationships. Riser shall include voltage, amperage, and short circuit interrupting capacity at each transformer, switchboard, panel board, and motor control center. Devices shall also indicate the room location they are installed.

(b) All new electrical equipment shall be flush mounted except where noted otherwise on the design plans.

3.2 Interior Wiring System

3.2.1 General

(a) A common neutral and equipment ground may be used in branch circuit home runs to a single panel subject to the following conditions:

(1) In a three-phase, four-wire system, a maximum of three opposite phase conductors shall share a common neutral or equipment ground (multiwire branch circuit).

(2) In a single phase system, a maximum of two opposite phase conductors shall share a common neutral or equipment ground.

(3) On multi-wire branch circuits, breaker ties shall provide a means to simultaneously open all ungrounded conductors at the panelboard where the branch circuit originates.

(4) The wire size of the equipment ground shall be selected to accommodate the largest over current device of the circuit conductors within the same raceway.

(5) When the sizes of the ungrounded conductors are increased to account for voltage drop, etc., the equipment-grounding conductor shall be increased in size proportionately in relation to the circular mil area of the ungrounded conductors.

(6) For “dedicated” computer circuits (such as used in system furniture wiring), the neutral conductor shall not be shared.

(7) Junction box covers shall be clearly identified. Identification shall include the circuit number and the panel from which it originates. Junction box covers shall also include the voltage present.

(b) For equipment protection, HVAC facilities shall be installed and maintained to provide electrical vaults and other designated electrical equipment rooms within a maximum temperature range of 72 to 78 degrees Fahrenheit.

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3.2.2 Conduit

(a) All wiring (including, but not limited to, power, fire alarm, telephone, intercom, communications, control, etc.) shall be in metal raceway.

(b) Indoor medium-voltage (primary) wiring shall be in appropriately marked rigid galvanized steel conduit or cable tray.

(c) Secondary voltage wiring may be in rigid steel or EMT. ENT shall not be used.

(d) Flexible metal conduit (FMC) shall only be used for equipment connections (appliances, luminaries), and to fish into existing walls and shall not be used for general wiring applications.

(e) Equipment that requires flexibility at connections, to include but not limited to motors and transformers, shall utilize liquid-tight flexible metal conduit (LFMC). Liquid-tight flexible metal conduit used out doors shall be listed and identified on the outer shield as “sun light resistant” or similar verbiage.

(f) When schedule-40 PVC is used under slabs, conduit stub ups shall be Rigid Galvanized Coated conduit.

(g) No metal-clad cable, (Type MC), shall be permitted. Exception: Metal Clad (MC) cable shall be allowed when factory installed wired whips are provided by the manufacture with new luminaries. Exceptions must be approved by BCE or MAD.

(h) All raceways shall be concealed above ceiling, under floor, or in walls, except where noted on the design plans. No exposed raceways shall be permitted on exterior building surfaces.

Exceptions must be approved by the Base Civil Engineering office (CECE).

(i) Raceways shall not be supported by suspended ceiling or suspended ceiling support wires;

only wires installed and identified per the NEC shall be permitted for supporting raceway.

(j) Where possible, raceways to roof mounted equipment shall be routed beneath the roof structure to a penetration immediately adjacent to the equipment.

(k) All raceway penetrations through established fire barriers shall be sealed with an approved fire stopping material.

(l) Fixture whips must be supported independently of the ceiling grid, coiling of the whip and placing on top of the fixture shall not be permitted.

3.2.3 Wire

(a) Insulated conductors shall be copper, type THHN, unless otherwise specified on the design plans.

(b) Insulated conductors to be installed in wet locations (i.e. below grade) shall be type THHW, or an approved equal.

(c) Insulated conductors used for a new service mast or a new utility pole riser shall be identified on the outer insulation layer as “sunlight resistant”.

(d) Wire shall be stranded for #10AWG and larger. On branch circuit feeders for general purpose wiring #12 solid is preferred for ease of termination, however #12 stranded may be used for ease of installation when the approved crimp termination is used at the device.

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3.3 Transformers

3.3.1 Transformers shall meet the following criteria:

(a) All transformers shall have copper bussing and windings.

(b) Transformers shall have, as a minimum, four (4) 2.5% taps (2+, 2- nominal voltage).

(c) Transformers serving non-linear loads shall have appropriate K-factor rating.

3.3.2 Transformer installation:

(a) Conductor sizing (primary and secondary) for new transformer installations shall be rated not less than 125% of the transformer rated current.

(b) Where K-rated transformers are utilized. Neutral conductors shall be up-sized as required.

(c) Ventilation (distance from walls) shall be as specified by the manufacturer. Normally the recommended clearances are mentioned on the transformer data plate.

(d) Transformers shall be secured to floors using the four mounting holes provided by the manufacturer.

(e) All new raceway installations to new/existing transformers shall have insulated grounding bushings installed.

(f) Transformer cable terminations (primary and secondary) shall comprise of the crimp type.

The use of mechanical type lug shall not be allowed.

(g) There shall be no modification (i.e. drilling holes bigger) of crimp type connectors being used for conductor terminations to the transformer bushings.

(h) Connections to the primary bushings shall comprise of bronze bolts, bronze flat washers, bronze lock washers and bronze nuts. Bronze or cadmium bolts, flat washers, lock washers and nuts may be used on the secondary bushings.

(i) The bolts used to secure the cable terminations to the transformer bushing shall be of the same diameter as the manufactures hole in the transformer bushing.

(j) All bolts used to secure the cable terminations to the transformer bushings shall be tightened to the torque specified for that particular diameter of bolt. Tightening shall be performed using a calibrated torque wrench. After tightening, each connection shall be marked per industry standards using a grease pen or permanent marker.

(k) All ground lugs secured to the transformer case shall have the factory paint removed prior to the installation of the ground lug. The diameter of the removed paint area shall exceed the mounting surface area of the lug to allow for inspection.

(l) All ground lugs secured to the transformer case shall comprise of a drilled hole (same diameter hole as in the ground lug), bronze bolt, bronze flat washer, bronze lock washer and bronze nut. Ventilation openings on the bottom of transformers shall not be used as bolt holes for the securing of any ground lug/bus.

(m) Bolts used to secure ground lugs to the transformer case shall be tightened to the torque specified for that particular diameter of bolt. Tightening shall be performed using a calibrated torque wrench. After tightening, each connection shall be marked per industry standards using a grease pen or permanent marker.

(n) The number of ground wires terminated in a ground lug shall not exceed one, unless the lug is listed for more than one wire under a single screw.

3.3.3 Transformer Bonding:

(a) Transformer bonding shall be completed in strict compliance with Article 250 of the NEC.

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(b) Resistance readings shall be obtained, officially documented, and become a matter of record on all new grounding electrode system installations. This same requirement shall apply to any existing transformer installation to be altered/tapped due to new electrical design requirements.

(c) New transformer installations and existing transformers that have been altered/tapped shall not be energized until the grounding system has been inspected and approved by a government representative.

(d) All grounding electrode conductor connections to ground rods and building steel shall comprise of the exothermic welding process or an approved irreversible compression connector listed for the purpose. Mechanical lugs shall not be allowed.

(e) All grounding electrode conductor connections to fire sprinkler piping, steam piping and water piping shall comprise of a pipe clamp listed for the purpose.

(f) All grounding electrode conductor connections to new/existing metal bar joists shall comprise of a mechanical lug listed for the purpose.

(g) The penetration for the grounding electrode conductor into the new/existing transformer shall comprise of listed bushings or metal fitted locknut. Drilling a hole or using the ventilation openings on the bottom of the transformer to install the new GEC shall not be allowed.

(h) As required for physical protection, the grounding electrode conductor (GEC) shall be installed within a raceway. The raceway shall be either electrical metallic tubing (EMT) or rigid metal conduit (RMC). Grounding bushings shall be installed (on both ends) of the new raceway. PVC raceways shall not be used for the physical protection of a GEC.

(i) On transformers directly feeding distribution panels, derive the neutral at the transformer.

3.3.4 Transformer output voltage shall be verified at commissioning of system and load taps adjusted to provide voltage ± 2% of nominal.

3.4 Panelboards, Switchboards, Safety Switches, Motor Control Centers\

(a) Panelboards, switchboards, safety switches and motor control centers (MCCs) shall be provided with a dedicated space equal to the width and depth of the equipment and extending from the floor to a height of 6 feet above the equipment (per NEC) or to the structural ceiling, whichever is lower. No piping, ducts, or equipment foreign to the electrical installation shall be located in this space. Sprinkler protection shall be permitted if the electrical equipment is protected from water leakage.

(b) Every circuit and circuit modification shall be legibly identified as to its clear, evident, and specific purpose or use. The identification shall include sufficient detail to allow each circuit to be distinguished from all others.

(1) Circuits for panelboards shall be identified using a directory located inside the panel door (mounted behind a clear protective cover/holder). In addition, panelboard directories shall also indicate panel identifier (provided by CE), “Fed from” information, and the date of installation.

(2) Circuits for switchboards and MCCs shall be identified using an engraved phenolic label at each switch position. In addition, switchboards and motor control centers shall also include an engraved phenolic label indicating switchboard/MCC identifier (provided by CE), “Fed from” information, and the date of installation.

(c) All panelboards shall have copper buses.

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(d) A separate, listed equipment ground bar kit (not bonded to the neutral bus) shall be provided in all new panelboards.

(e) Two spare ¾” conduits shall be stubbed and capped off from each new branch circuit panel to above ceiling and below accessible floor, at no additional cost to the government.

(f) All new panelboards shall contain provisions for bolt-on type branch circuit breakers.

(g) All new safety switches shall be listed for heavy duty (HD) applications.

(h) All new conductor termination points in new panelboards, switchboards, safety switches and motor control centers shall have the bolts tightened to the torque specified on the label attached by the manufacturer within the equipment.

(i) For conductors #4 and larger conductors, bushings shall be insulated.

3.5 Motors

(a) Premium efficiency motors shall be utilized for all applications 25 Hp or larger.

(b) Provide phase loss relay for each motor greater than 10 HP in size. Relay shall be integral part of starter, and shall NOT require a separate enclosure.

(c) Conductors for motors shall be sized in accordance with the NEC code book amps x 125%, not the data plate full load amps. Exception: HVAC equipment.

(d) Motor overloads (heaters) shall be sized utilizing the motor data plate full load amps and motor data plate service factor.

3.6 Systems Furniture

(a) User organizations will be responsible to provide designer with the proposed new system furniture layout (scaled drawing) and specifications on the system furniture to be purchased. Design information shall include but not limited to, wiring (type and size), raceways (type and size), j-boxes (size, wall or ceiling mounted), volt amps and voltage of each unit for connection of the system furniture. Reference NEC 2005 Handbook Section

605.6 Fixed-Type Partitions and 605.7 Freestanding-Type Partitions for multi-wire circuit breaker requirements.

(b) Each “cubicle” (or renovated walled office) shall be provided with one designated computer outlet on a separate circuit. Circuit may be shared among multiple cubicles or offices;

however, never more than two designated computer outlets will share a single circuit. For electrical calculation purposes; for update of an existing panel board directory; or to construct a new panel board directory, a volt amp (VA) load of 540 volt amps shall be used for each of the two authorized computer outlets).

(c) Each cubicle (or renovated walled office) shall be provided with a minimum of two additional general use outlets. Outlets may share a single circuit, or be provided with separate circuits. Circuits may be shared among multiple cubicles; however, never more that six outlets will share a single circuit. For electrical calculation purposes; for update of an existing panel board directory; or to construct a new panel board directory, a volt amp (VA) load of 180 volt amps shall be used for each of the six receptacles.

(d) Each circuit shall have a separate neutral conductor. Where more than one neutral conductor terminates in a junction box, all neutral conductors shall be identified with the circuit number.

(e) Due to harmonics generated by computer power supplies, the neutral conductor shall be considered current carrying for all wire sizing (de-rating) calculations.

(f) All new panel boards shall be rated for non-linear loads (200% neutral) fed from K-rated transformers.

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3.7 Interior Lighting

3.7.1 General

(a) Lighting Levels - General illumination levels shall not exceed the intensities shown in the latest edition of UFC-3-530-01AN Interior and Exterior Lighting and Controls. Where lighting intensities are not indicated in UFC-3-530-01AN, the IES Lighting Handbook shall be used.

(b) Lighting shall be installed using 277V where available.

(c) Overhead lighting fixtures for buildings (interior lighting) shall comply with design requirements of UFC 4-010-01, paragraph B-3.6 and B-4.5, antiterrorism provisions.

(d) Test instruments used to measure both normal and emergency lighting shall contain a current calibration sticker that indicates the current calibration date and the date due for the next calibration.

(e) Emergency Ligthing:

(1) Emergency lighting must be provided in accordance with latest edition of NFPA 101 and ETL 99-4 (dated 09 Nov 1999). Normally, emergency lighting is required along paths of egress. Emergency lights shall also be provided in mechanical and electrical equipment rooms, interior windowless conference rooms and classrooms and large office areas.

(2) Twin head “lunchbox” style light fixtures shall not be used. Exception: Use of lunchbox fixtures may be approved on a case-by-case basis by Base Civil Engineering

(72ABW/CECE).

(3) All new emergency light installations shall be witness tested as outlined in NFPA 101.

The test shall comprise of turning off the branch circuit and allowing the emergency lights to burn for at least 1-1/2 hours. Foot candle readings shall be taken during and at the end of the test. The final foot candle (fc) reading shall comply with NFPA 101. The test results shall be documented and become a matter of official record.

(f) Emergency/exit lighting ballasts/batteries shall include self-testing/self-diagnostic features, which meet the requirements of NFPA 101 for testing. Ballasts shall include an indicator light and audible alarm to indicate battery/charger status and test results.

3.7.2 Fluorescent Fixtures

(a) Lighting for general office areas, classrooms, corridors, conference rooms, and lobbies shall be provided by 2' x 4' recessed fluorescent fixtures.

(b) For energy efficient interior lighting schemes, lighting systems should be designed to allow reduction of lighting levels by appropriately banking lighting circuits or providing separate switching of inner and outer lamps in 3 or 4 tube fluorescent fixtures.

(c) Consideration should also be given for any task lighting that might be provided by systems furniture, and overhead lighting should be reduced accordingly.

(d) Parabolic fixtures shall be used to maximum extent possible.

(e) Fluorescent fixtures shall use T-5 or T-8 lamps, electronic ballast with high power factor

(greater than .9) and low harmonic distortion (less than 10%).

(f) Where acrylic lens are used, they shall be a minimum .156 inches thick.

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(g) An un-switched lighting circuit phase conductor shall be provided and installed to serve self-contained emergency battery packs in new fluorescent fixtures installed or where these units are shown to be installed in existing fluorescent fixtures. This un-switched phase conductor shall be on the same lighting branch circuit serving switched lamps, and installed in existing lighting branch circuit conduit system.

3.7.3 Exit Lights

(a) All EXIT Lights shall be of the diffused L.E.D. type with red lettering and have emergency battery backup, and self diagnostic feature.

3.8 Communications/LAN

(a) Provide communications equipment rooms (closets) for all new construction. Closets shall be a minimum of 4’x 5’x 8’, with a telephone backboard (4’x 4’ minimum) installed two feet off the ground above the service entrance conduits. Where larger backboards are installed, backboard shall be mounted horizontally (long side parallel to the ground).

(b) Provide minimum 2-each 110Vac, 20A, fourplex outlets with lightning surge protection.

Each fourplex outlet shall be fed by a dedicated circuit.

(c) For all new construction, or as specified for renovations, building shall be pre-wired with minimum of two (2) Category-5 cables (24-4) to each outlet (one data/one voice).

(d) For all other renovation work, outlets shall be “roughed-in” as described below and no cable will be provided.

(e) Communication/LAN outlets shall consist of 4”x4” outlet box mounted 18” AFF with ¾” EMT (with pull wire) routed to above finished ceiling.

(f) Communication/data cable shall be independently supported by J-hooks, or placed in cable tray/conduit as required by the N.E.C. (do not lay cable on suspended ceiling). Hook & Loop (Velcro) strapping shall be the approved means for securing systems wiring. Ty-Wraps shall not be used.

4. Fire Protection

4.1 General

(a) Fire protection systems will be designed and installed in accordance with UFC 3-600-1, American with Disabilities Act Guidelines, Unified Federal Accessibility Standards, and National Fire Protection Association standards.

(b) Fire Alarm Riser diagram shall show all devices with room number (and address if addressable) for each device. Included shall be initiating and notification devices. Riser shall clearly demonstrate Class A performance.

(c) The system will have tamper switches on all valves that would disable the sprinkler system, and will transmit all trouble, tamper, and flow alarms to the Base Fire Department.

(d) Circuit conductors for Fire Alarm circuits shall be #14 AWG (minimum) for Conventional fire alarm systems. Addressable Fire Alarm Systems circuit conductors shall be #14 AWG for Notification Circuits and SLC circuits shall be a minimum of 16 AWG.

(e) Circuit conductors for new fire alarm system installation shall be installed without splices or joints. It shall be allowed to install pull boxes as necessary, however, the pull boxes shall only be used for conductor pulling purposes and not for the splicing or joining of conductors.

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(f) Record of completion shall be completed when any system is altered or installed per NFPA 72.

(g) All field devices shall be marked and identified with an approved label, identifying circuit and node location.

(h) All circuit conductors must be proven to be free from grounds and insulation cuts.

4.2 Fire Alarm Control Panels

(a) Fire alarm panels and devices shall be specified as “Fire Control Instruments (FCI)” or equal on all projects. The preferred fire alarm panel is the FCI – 7100 or Edwards Systems Technology (EST) QS4.

(b) All new Fire Alarm Control Panels, at the time of installation, shall have a minimum 20% spare capacity to allow for the installation of future devices.

(c) All fire alarm control panels, regardless of manufacturer, shall meet the following requirements:

(1) Panels (conventional or addressable) shall provide Class “A” supervised fire alarm circuit that provides a trouble signal and continues to operate as an alarm circuit after one fault has occurred in the wiring.

(2) Addressable panels shall be programmed to send signals similar to a conventional panel, and must be approved by the Base prior to programming.

(3) The control panel shall have a minimum of one set of dry contacts for each for alarm and trouble reporting to the Fire Department.

(4) Panel shall be compatible with the Monaco system.

(5) Conventional Panel zones must be switchable for zone disconnection.

(d) The fire alarm panel shall be flush mounted near the main entrance of the building.

Alternately, then panel may be mounted in an equipment room, and a remote annunciator may be installed near the main entrance.

4.3 Radio Alarm System

(a) Alarms will be received by a Monaco “D700 Plus” Radio Fire Alarm System currently in use at Tinker AFB.

(b) Radio alarm transceivers shall be Monaco BT2-7, expandable to16 zones. Transceivers will be set to the frequency of 140.0500 MHz. BTX transceivers shall be utilized if it has been determined that Mass Notification will be installed within that facility. Frequency must be verified during design with the Base Fire Alarm Maintenance Work center.

(c) Installation shall include all equipment necessary to transmit fire alarms to the central reporting and receiving system (located at Base Fire Department, B/117), including cable, brackets, antennas, etc.

(d) The transceiver will be located in an equipment room, if possible. The lightning arrestor will be installed in a rain tight enclosure and mounted as close to the antenna as possible. All coaxial cables will be encased in conduit from the lightning arrestor enclosure to the transceiver.

4.4 Initiating/Notification Devices

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(a) Manual pull stations for evacuation of personnel and transmission of fire alarms to the Base Fire Department will be located at each exit and spaced to meet NFPA requirements.

(b) Manual pull stations shall be double action pull stations and must comply with NFPA standards. Pull stations used on AFFF and Sprinkler systems for releasing must be in compliance with requirements of ETL 02-15 regarding function, color and style.

(c) Heat detectors, smoke detectors and audible/visual devices shall comply with NFPA standards.

(d) Additional notification circuits applied to any fire alarm panel must be installed with a capability of being silenced when the fire alarm panel is silenced after an alarm condition other than the supervisory alarms.

(e) For new or modified fire alarm systems, new notification circuits shall only be loaded to 80% of the rated capacity to allow for the addition of future devices.

5. Intrusion Detection Systems

5.1 General

(a) Intrusion Detection will be designed and installed in accordance with Joint Air Force-Army- Navy (JFAN) 6/9, DOD 5200.1-R, AFI 31-101 and NFPA 731.

(b) Intrusion Security Systems Riser diagram shall show all devices with room number (and address if addressable) for each device included.

(c) The system will have tamper switches on all devices that would disable the detection device, and will transmit all tamper alarms to the Base Security Forces.

(d) Circuit conductors for Intrusion Detection Systems shall be stranded #20 AWG.

(e) Circuit conductors for new Intrusion Detection Systems installation shall be installed without splices and joints. It shall be allowed to install pull boxes as necessary, however, the pull boxes shall only be used for conductor pulling purposes and not for the splicing or joining of conductor.

Base Electrical Standards Point of Contact:

Richard A. Stewart P. E.

Tel: (405) 734-2869 Fax: (405) 734-5538