CAFB Electrical Standards.pdf

CAFB BASE STANDARDS Electrical

Electrical Page 1

BASIC ELECTRICAL MATERIALS AND METHODS

The exterior electrical system was privatized on 1 Mar 2013. With few exceptions the high-voltage electrical system is the property of the privatization contractor. Generally the point of demarcation is the low-voltage lugs of the supply transformer. Any exterior work to be done must be coordinated through the Base CE representative.

Voltage: Primary voltage is 13.2 kV and most secondary voltage systems are 120/208V or 277/480V, 3 phase, 4 wire. System voltage in each building must be verified.

Material and Equipment: 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.

Regulatory Requirements: Equipment, materials, installation, and workmanship must be in accordance with the mandatory and advisory provisions of NFPA 70. Electrical installations must conform to IEEE C2, NFPA 70, and requirements specified herein.

Warning Signs: Provide warning signs for the enclosures of electrical equipment including substations, pad-mounted transformers, pad-mounted switches, generators, and switchgear having a nominal rating exceeding 600 volts.

Motors – Single Phase: Unless otherwise requested, single-phase fractional-horsepower alternating-current motors must be high efficiency types.

Motors – Polyphase: Unless otherwise requested, polyphase motors must be selected based on high efficiency characteristics relative to the applications.

Painting - Factory Applied: Electrical equipment must only have factory-applied paint.

THREE-PHASE PAD-MOUNTED TRANSFORMERS

Compartments - High Voltage, Dead-Front:

High-voltage compartment must contain the incoming line, insulated high-voltage load-break connectors, bushing well inserts, six high-voltage bushing wells configured for loop feed application, load-break switch handle(s), access to oil-immersed fuses, dead-front surge arresters, tap changer handle, connector parking stands with insulated standoff bushings, and ground pad.

a. Insulated high-voltage load-break connectors: rated 95 kV BIL. Current rating: 200 amperes rms continuous.

Connector must have a steel reinforced hook-stick eye, grounding eye, test point, and arc-quenching contact material.

b. Bushing well inserts and feed-thru inserts: 200 amperes, 15 kV class. Provide a bushing well insert for each bushing well unless indicated otherwise.

Transformer:

Oil-insulated, two winding, 60 hertz, 65 º C rise above a 30 º C average ambient, self-cooled type. Copper or aluminum windings are acceptable.

Insulating Liquid:

Mineral oil: Type II, Provide identification of transformer as "non-PCB" and "Type II mineral oil" on the nameplate.

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Corrosion Protection:

Bases and cabinets of transformers must be corrosion resistant and must be fabricated of stainless steel. Base must include any part of pad-mounted transformer that is within 3 inches of concrete pad. Paint bases, cabinets, and tanks Base Standard color.

Ground Ring for Equipment:

Provide a ground ring around high-voltage equipment consisting of a ring with copper wire around the periphery with ground rods in each corner, a ground rod in the transformer window and two lead-ins from the ground ring.

Connections to the ring must be made by exothermic welding or approved irreversible compression fittings

UNDERGROUND TRANSMISSION AND DISTRIBUTION

Rigid Metal Conduit: Galvanized steel, threaded type.

Rigid Metal Conduit, PVC Coated: Galvanized steel, threaded type, coated with a polyvinyl chloride (PVC) sheath bonded to the galvanized exterior surface, nominal 40 mils thick.

Plastic Conduit for Direct Burial: NEMA TC 2, EPC-40-PVC.

600 Volt Wires and Cables: Service entrance and direct buried conductors must be Type USE. Conductors in conduit other than service entrance must be Type THHN/THWN-2. Conductors No.10 AWG must be stranded.

Conductors No.12 AWG and smaller must be solid. Conductors No. 8 AWG and larger must be stranded copper.

All conductors must be copper.

Medium Voltage Cable: Cable for underground distribution system must be ozone resistant ethylene-propylene-rubber-insulated (EPR) cable or cross-linked-thermosetting-insulated (XLP) cable. Cable must have a polyvinyl chloride jacket. Single phase circuits must use 100% neutral. Three phase circuits may use 1/3 neutral.

Medium Voltage Cable Terminations: Provide terminations including stress control terminator, ground clamp, connectors, and lugs. Terminator must be the product of one manufacturer, suitable for the type and materials of the cable terminated. Furnish components in the form of a "UL listed" kit, including complete instructions which must be followed for assembly and installation.

Indoor Terminations: Indoor terminator must be cold-shrink type or heat shrinkable type.

Buried Warning & Identification Tape: Provide detectable aluminum foil plastic-backed tape or detectable magnetic plastic tape manufactured specifically for warning and identification of buried cable and conduit. Tape must be detectable by an electronic detection instrument.

Medium Voltage Cable Joints: Provide power cable joints (splices) suitable for continuous immersion in water and direct burial. Make joints only in accessible locations in manholes or handholes by using materials and methods specified and as designated by the written instructions of the cable and joint kit manufacturer(s).

INTERIOR DISTRIBUTION SYSTEM

ELECTRICAL ROOMS & CLOSETS

Locate service entrance equipment and other major electrical equipment in a dedicated electrical equipment room.

Also provide electrical rooms and/or closets to separately house all other electrical equipment and components not normally found in occupied spaces including offices, conference rooms, laboratories, classrooms and auditoriums.

REFER TO UFC 3-520-01.

MATERIALS AND EQUIPMENT

Materials, equipment, and devices must, as a minimum, meet requirements of UL, where UL standards are established for those items, and requirements of NFPA 70. Grounding and bonding must be in accordance with NFPA 70 and NFPA 780.

Electrical Page 3

CONDUIT AND FITTINGS: must conform to the following:

Rigid Metallic Conduit: GRS or rigid non-metallic must be used in concrete, masonry walls if grouted and slabs, exposed to the weather or where subject to physical damage and on exterior of buildings.PVC may also be used in concrete.

Rigid, Threaded Zinc-Coated Steel Conduit: NEMA C80.1

Rigid Nonmetallic Conduit: PVC Type EPC-40, or fiberglass conduit. Use for service entrance conduits from the utility substation or underground below floor slabs or when required for 400 Hz circuits. Do not use PVC above the first floor slab of buildings. Underground portions outside the building must be encased in minimum 3 inches of concrete and installed 36 inches below grade for high voltage conduits.

Intermediate Metal Conduit (IMC): IMC may be used in lieu of GRS as allowed by NFPA 70 and approved by Base Civil Engineering.

See UFC 3-520-01 for locations where MC cable is authorized.

Electrical, Zinc-Coated Steel Metallic Tubing (EMT): Use EMT for branch circuits and feeders above suspended ceilings or exposed where not subject to physical damage. Do not use EMT underground, encased in concrete, mortar or grout, in hazardous locations, outdoors or in fire pump rooms.

Plastic-Coated Rigid Steel and IMC Conduit: Use in corrosive environments.

Flexible Metal Conduit: UL 1.

Liquid-Tight Flexible Metal Conduit, Steel: UL 360.

Fittings for Metal Conduit, EMT, and Flexible Metal Conduit: Ferrous fittings must be cadmium or zinc-coated.

Fittings for Rigid Metal Conduit and IMC: Threaded-type. Split couplings unacceptable.

Fittings for EMT: Connections must be threadless, die cast and raintight. Do not use crimp-on type. Set screw type may be used indoors only.

Fittings for Rigid Nonmetallic Conduit: NEMA TC 3, UL 514B.

Surface Metal Raceway:

Two-piece painted steel, totally enclosed, snap-cover type.

Cable Trays:

Cable trays must form a wireway system and must be of depth needed. Cable trays must be constructed of steel that has been zinc-coated after fabrication.

Outlet Boxes & Covers:

UL 514A, cadmium- or zinc-coated, if ferrous metal, or UL 514C, if nonmetallic.

Cabinets, Junction Boxes, & Pull Boxes:

Volume greater than 100 cubic inches, hot-dip, zinc-coated, if sheet steel.

Wires and Cables: Wires and cables must meet applicable requirements of NFPA 70 and UL for type of insulation, jacket, and conductor specified or indicated. Wires and cables manufactured more than 12 months prior to date of delivery to site must not be used.

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Conductors: Conductors No. 8 AWG and larger diameter must be stranded. Conductors No. 12 AWG and smaller diameter must be solid, except that conductors for remote control, alarm, and signal circuits, classes 1, 2, and 3, must be stranded unless specifically indicated otherwise. Conductors No. 10 must be stranded. Conductor sizes and ampacities shown are based on copper, unless indicated otherwise. All conductors must be copper.

Minimum Conductor Sizes: Minimum size for branch circuits must be No. 12 AWG; for Class 1 remote-control and signal circuits, No. 14 AWG; for Class 2 low-energy, remote-control and signal circuits, No. 16 AWG; and for Class 3 low-energy, remote-control, alarm and signal circuits, No. 22 AWG.

Wire Insulation: Unless specified or indicated otherwise or required by NFPA 70, power and lighting wires must be 600-volt, Type THHN/THWN-2. Grounding wire may be type THHN/THWN-2. Remote-control and signal circuits must be Type THHN/THWN.

Toggle Switches: Single Pole, double pole, three-way, and four-way, totally enclosed with bodies of thermoplastic and/or thermoset plastic and mounting strap with grounding screw. Wiring terminals must be screw-type, side-wired. Voltage rating must be120V/277V and 20 amp. Switches must be specification grade as a minimum.

Receptacles: Hard use, heavy-duty, grounding-type. Face and body must be thermoplastic supported on a metal mounting strap. Provide screw-type, side-wired wiring terminals. Connect grounding pole to mounting strap.

Receptacles must be specification grade as a minimum.

Weatherproof Receptacles: Provide in cast metal box with gasketed, weatherproof, cast-metal cover plate and gasketed cap over each receptacle opening. Receptacle must be UL listed for use in "wet locations with plug in use."

GFCI Receptacles: Ground-Fault Circuit Interrupter Receptacles must be duplex type, 20 A, for mounting in standard outlet box.

Range Receptacles: NEMA 14-50 configuration, rated 50 amperes, 125/250 volts.

Dryer Receptacles: NEMA 14-30 configuration, rated 30 amperes, 125/250 volts.

Panelboards: Must have a short-circuit current rating of 10,000 amperes symmetrical minimum or higher rating as needed for short-circuit current at the point of application. Panelboards for use as service disconnecting means must be listed for such use. Panelboards must be circuit breaker-equipped. Design must be such that individual breakers can be removed without disturbing adjacent units or without loosening or removing supplemental insulation supplied as means of obtaining clearances as required by UL. Directories must indicate load served by each circuit in panelboard. Type directories and mount in holder behind transparent protective covering. Load centers must not be used. Circuit breakers must be bolt-on type. Do not use dual section panelboards. Do not use series rated breakers. Busses in panelboards must be copper.

Panelboard Neutrals for Non-Linear Loads: Panelboard type must have been specifically UL heat rise tested for use on non-linear loads. Panelboard must be heat rise tested except with the neutral assembly installed and carrying 200 percent of the phase bus current during testing. Two neutral assemblies paralleled together with cable are not acceptable. Nameplates for panelboard rated for use on non-linear loads must be marked "SUITABLE FOR NON-

LINEAR LOADS."

Circuit Breakers: Thermal magnetic-type having a minimum short-circuit current rating equal to the short-circuit current rating of the panelboard in which the circuit breaker must be mounted or must be rated for the short-circuit availability at the point of connection of the panelboard. Series rated circuit breakers and plug-in circuit breakers are not acceptable. Electronic type circuit breakers are acceptable.

Circuit Breaker With GFCI or GFI: Must be UL 943 and NFPA 70 listed.

Electrical Page 5

Arc-Fault Circuit-Interrupters: Molded case circuit breaker must be rated as indicated.

400 Hz Panelboard & Breakers: Panelboards and breakers in 400 Hz systems must be "400 Hz" rated and labeled.

Load Centers: Load centers must not be used.

Transformers: General purpose, dry-type, self-cooled. Provide transformers in NEMA enclosure. Transformer must have 220 º C insulation system for transformers 15 kVA and greater, and must have 180 º C insulation for transformers rated 10 kVA and less, with temperature rise not exceeding 80 º C under full-rated load in maximum ambient of 40 º C. Transformer of 80 º C temperature rise must be capable of carrying continuously 130 percent of nameplate kVA without exceeding insulation rating. Transformers must be quiet type with maximum sound level at least 3 decibels less than NEMA standard level for transformer ratings indicated. K rated transformers must be used to mitigate harmonic effects of non-linear loads. Copper or aluminum windings are acceptable. Provide energy efficient transformer.

Motors: Motors for operation on 208-volt, 3-phase circuits must have terminal voltage rating of 200 volts, and those for operation on 480-volt, 3-phase circuits must have terminal voltage rating of 460 volts.

TELEPHONE & LAN SYSTEM: COMPLY WITH EIA/TIA-568-B, 569 AND 606. Reference UFC 3-580-0.

Coordinate closely with communications.

Grounding and Bonding Equipment: Provide equipment grounding conductors. Ground rods must be copper-clad steel, with minimum diameter of 3/4 in and minimum length of 10 ft.

INTERIOR LIGHTING: Reference UFC 3-530-01

Fluorescent Lighting Fixtures: Fluorescent fixtures must have electronic ballasts.

Fluorescent Lamps: T-8 rapid start low mercury lamps must be rated 32 watts (maximum), 2800 initial lumens (minimum), CRI of 75 (minimum), color temperature of 3500 K, and an average rated life of 20,000 hours. Low mercury lamps must have passed the EPA Toxicity Characteristic Leachate Procedure (TCLP) for mercury by using the lamp sample preparation procedure described in NEMA LL 1.

Provide program start ballast for those fixtures that are frequently switched. Normal fluorescent ballasts may be rapid start or instant start.

Compact Fluorescent Lamps: Compact fluorescent lamps must be: CRI 80, minimum, 3500 K, 10,000 hours average rated life, and as follows:

a. T-4, twin tube, rated 5 watt, 250 initial lumens (minimum); 7 watts, 400 initial lumens (minimum); 9 watts, 600 initial lumens (minimum); and 13 watts, 825 initial lumens (minimum).

b. T-4, double twin tube, rated 13 watts, 900 initial lumens (minimum); 18 watts, 1200 initial lumens

(minimum); and 26 watts, 1800 initial lumens (minimum).

High-Intensity-Discharge (HID) Lighting Fixtures: Provide HID fixtures with tempered glass lenses when using metal-halide lamps. If approved, open Metal Halide may be used only if the lamp is rated for open fixture in industrial areas.

HID Ballasts: Must be constant wattage autotransformer (CWA) or regulator, high power factor type. Provide single-lamp ballasts which must have a minimum starting temperature of minus 30 degrees C.

HPS Ballasts: must have a solid-state igniter starter.

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Standby High-Pressure Sodium (HPS) Lamps: Standby HPS lamps must have two arc tubes and an average rated life of 40,000 hours (minimum) and hot restart. Instant lumen output must be 8 percent, minimum, of total light output.

Metal-Halide Lamps: Use where color rendition is needed.

Incandescent Lighting Fixtures: UL 1598.

Incandescent Dimmer Switch: Single-pole, 120 volt ac, full-range rotary or slide, on-off type, with built-in electromagnetic interference filter.

Exit Signs: Exit signs must be self-powered type.

Self-Powered LED Type Exit Signs (Battery Backup):

Provide with automatic power failure device, test switch, pilot light, integral self-testing module and fully automatic high/low trickle charger in a self-contained power pack. Battery must be sealed electrolyte type, must operate unattended, and require no maintenance, including no additional water, for a period of not less than 5 years. LED exit sign must have emergency run time of 1 1/2 hours (minimum) and be red.

Fluorescent Emergency Lighting System:

Each system must consist of an automatic power failure device, test switch operable from outside of the fixture, pilot light visible from outside the fixture, integral self-testing module and fully automatic solid-state charger in a self-contained power pack. Battery must operate unattended and require no maintenance, including no additional water, for a period of not less than 5 years. Emergency ballasts provided with fixtures containing solid-state ballasts must be fully compatible with the solid-state ballasts. Industrial areas may use wall-pack emergency lights.

Auxiliary Instant-On System:

UL listed, automatically switched instant-on lamp. Quartz lamp must come on when luminaire is initially energized and following a momentary power outage must remain on until HID lamp reaches approximately 60 percent light output.

Occupancy Sensors:

Provide combination ultrasonic-infrared occupancy sensors for classrooms and conference rooms and other locations where required for energy conservation.

LED Fixtures:

LED lighting, where appropriate, is permitted. Induction fluorescent lighting, where appropriate, is permitted.

Wireless Lighting Control Systems:

Wireless lighting control systems are not allowed to be used on any projects.

EXTERIOR LIGHTING Reference UFC 3-530-01

Poles: provide poles designed for wind loading of 90 miles per hour determined in accordance with AASHTO LTS- 4 while supporting luminaires. REFERENCE UFC 3-301-01

Aluminum Poles: Provide aluminum poles manufactured of corrosion resistant aluminum alloys conforming to AASHTO LTS-4 for Alloy 6063-T6 or Alloy 6005-T5 for wrought alloys and Alloy 356-T4 (3, 5) for cast alloys.

Poles must be seamless extruded square or round type with minimum wall thickness to meet loads.

Luminaires: Fixtures must be shoebox type compatible with existing fixtures on Base.

Lamps: Use HPS lamps except where color rendition is required. LED lighting, where appropriate, is permitted.

Induction fluorescent lighting, where appropriate, is permitted.

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HID Ballasts: Must be constant wattage autotransformer (CWA) or regulator, high power factor type. Provide single-lamp ballasts which have a minimum starting temperature of minus 30 degrees C. HPS ballasts must have a solid-state igniter starter.

Photocell Switches: provide hermetically sealed cadmium-sulfide or silicon diode type cell. Switch must turn on at or below 3 foot-candles and off at 2 to 10 foot-candles. A time delay must prevent accidental switching from transient light sources. Provide switch in areas including:

a. Parking areas must be controlled by common photocell.

b. Exterior building lights with same on/off schedule must be controlled by common photocell.

c. In a cast weatherproof aluminum housing with adjustable window slide, rated 1800 VA, minimum.

Generators and Transfer Switches: Reference UFC 3-540-01

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