16050.doc

SECTION 16050

PART 1

GENERAL

1.1 SECTION INCLUDES

A. Conduit

B. Junction, pull and device boxes

C. Conductors

D. Disconnect switches

E. Overcurrent devices

F. Wiring devices

G. Lighting and branch circuit panelboards

H. Grounding

I. Testing

1.2 RELATED SECTIONS

Section 16010 - GENERAL ELECTRICAL PROVISIONS

1.3 REFERENCES

A. National Electrical Manufacturers Association (NEMA).

B. Underwriters' Laboratories (UL).

C. American National Standards Institute (ANSI).

D. ANSI/NFPA 70-National Electrical Code (NEC).

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

1.4

SUBMITTALS

A. Submit under provisions of Section 16010.

B. Product Data: Provide manufacturer's literature and product data on all equipment listed in Paragraph 1.1.

PART 2

PRODUCTS

2.1

CONDUIT

A. Electrical metallic tubing (EMT) shall be galvanized on the outside and coated on the inside with a smooth hard finish of lacquer, varnish or enamel. EMT shall comply with Underwriters Laboratories (UL) Standard UL 797 and ANSI C80‑3. EMT coupling and box connectors for EMT shall be of the steel compression gland type.

B. Rigid galvanized steel (RGS) conduit shall be hot-dipped, galvanized steel with zinc coating or corrosion-resistant lacquer on the inside. RGS shall comply with UL Standard UL 6 and ANSI C80‑1. Fittings shall be threaded, water and concrete-tight.

C. Flexible metal conduit (FMC) shall be of hot-dipped, galvanized, interlocked, spirally wound steel strip and shall comply with ANSI/UL 1. Connectors shall be galvanized and shall be suitable for connection to the associated boxes and conduits.

D. Liquidtight flexible metal conduit (LTFMC) shall be similar to flexible metal conduit and shall also have an outer PVC jacket and shall comply with ANSI/UL 360. Connectors shall be equal to Appleton type "ST" connectors.

E. Plastic conduit for direct burial shall be rigid, heavywall, Schedule 40, polyvinyl chloride (PVC). All Schedule 40 PVC conduit shall meet the requirements of UL and shall be manufactured by Carlon or approved equal.

F. Plastic conduit for installation in concrete duct banks shall be thinwall conforming to NEMA Standard TC6 and shall be UL listed.

G. Minimum conduit size shall be 3/4 inch.

2.2

JUNCTION, PULL AND DEVICE BOXES

A. Junction and pull boxes shall be of code galvanized steel. Boxes mounted vertically on a wall shall be provided with hinged covers and catchlocks. Boxes mounted horizontally in or on the ceiling shall be furnished with screw covers. All such boxes shall conform to NEC for size and gauge of material. Junction and pull boxes shall be provided as required even if not shown on the drawings.

B. Device boxes and general purpose junction boxes shall be one-piece galvanized pressed steel knockout type with similar cover, and not less than 4 inches square. No sectional boxes will be permitted, except at single-pole switch locations with only two conductors.

C. All gang boxes for devices shall be designed specifically for the number of devices indicated.

Boxes for exterior devices shall be cast iron, Crouse Hinds FD, or approved equal, with gasketed covers.

2.3 CONDUCTORS

A. Conductors shall be of soft-drawn annealed copper. Conductors shall conform to federal specifications for the type of wire designated, and shall have a conductivity of not less than 98 percent of that of pure copper.

B. Minimum conductor size for power and lighting circuits shall be No. 12 AWG, unless shown otherwise on the drawings. Minimum conductor size for control and signal circuits shall be No. 14 AWG, unless shown otherwise on the drawings.

C. All conductors No. AWG and larger shall be stranded. All conductors No. AWG and smaller shall be solid.

D. All conductors located in dry locations shall be type THHN/THWN unless specifically designated otherwise. All conductors located in outdoor or wet locations shall be type XHHW-2.

E. All branch circuit conductors used for wiring in high temperature locations (such as boiler controls, range hoods, heating equipment, etc.) shall be type RHH heat-resistant grade.

F. Conductors shall be color coded as follows:

120/, 3 phase, 4 wire................................Black, Red and White

Control Circuits.............................................................Other than above

G. For phase conductors larger than No. 4 AWG, or neutral conductors No. 4 AWG or larger, colored plastic tape may be used in lieu of continuously colored conductor insulation. Each conductor shall have at least three 1‑inch bands (4‑inch separation) at every termination and splice.

H. Wire connectors shall be as follows:

1. Connectors for No. 8 AWG and smaller (dry locations) shall be self-insulated spiral spring screw-on connector with resilient or unbreakable plastic insulating cap. No ceramic or brittle plastic shell connectors will be approved.

2. Connectors for No. 8 AWG and smaller (damp locations) shall be compression sleeve type.

3. Connectors for No. 6 AWG and larger wires (damp or dry locations) shall be compression sleeve type.

2.4

DISCONNECT SWITCHES

A. Provide enclosed, fusible or nonfusible switches as shown on the drawings.

B. Switches shall be horsepower rated and shall have quick-make and quick-break mechanisms and interlocked covers.

C. Disconnect switches shall be heavy duty type HD.

D. Switches shall be suitable for the voltage, number of phases and wires, and short circuit and load currents shown on the drawings.

E. Fusible disconnect switches shall have provisions for Class R fuses.

F. Enclosures shall be the NEMA type suitable for the environmental conditions where the switch is installed.

G. Enclosures shall be of code gauge steel (NEMA 1) or code gauge galvanized steel (NEMA 3R). Enclosures shall be treated with a rust-inhibiting phosphate and finished in gray baked enamel.

H. Disconnect switches shall be service entrance rated where required by the drawings or codes.

2.5

OVERCURRENT DEVICES

A. Fuses

1. All fuses, 600 volts and less, shall be Bussmann "Low-Peak" or approved equal, and shall meet the following:

a. All fuses shall be manufactured by the same manufacturer.

b. Fuses rated 1/10 to 600 amperes shall be UL Class R dual element current limiting. All dual-element fuses shall have separate overload and short-circuit elements, and shall be Bussmann type LPS‑RK (600V), LPN‑RK (250V) or approved equal.

c. Furnish to Owner spare fuses as follows: 10 percent of each size and type of fuse rated 600 amperes or less, but in no case less than one set of three.

B. Circuit breakers

1. All circuit breakers shall be thermal magnetic, molded case, and shall have the following characteristics:

a. Quick-make, quick-break type.

b. "Bolt-on" type.

c. Fully rated for the available fault current as shown on the drawings. Series ratings are unacceptable.

d. Common trip type for all multipole breakers.

e. Operating handle shall visually indicate ON, OFF or TRIPPED conditions.

f. Indicate the ampacity and frame size on the breaker.

g. When used for switching light circuits, shall be marked "SWD," indicating "switch duty rated."

h. When required by equipment manufacturer, circuit breaker shall be "HACR" rated.

2. Where enclosed circuit breaker disconnects are shown on the drawings, provide an enclosure suitable for the environmental conditions where the breaker is installed.

2.6 WIRING DEVICES

A.

Receptacles

1.

Receptacles shall be flush, 20 amperes, 125 volts, specification grade, three wire, self or automatic grounding, ivory duplex, and shall be Hubbell No. 5362‑I or approved equal.

2.

Ground fault receptacles shall be flush, 20 amperes, 125 volts, specification grade, three wire, grounding, ivory duplex, and shall be Hubbell No. GF5362‑I or approved equal.

3.

Special purpose outlets not covered by the specifications but noted on the drawings shall be of the amperage and voltage rating indicated. The outlets shall be specification grade of the same quality, manufacturer and finish as those specified above.

4.

Other approved wiring device manufactures are Byrant, P & S and Leviton.

B.

Wall switches

1.

All lighting circuits shall be supplied with 20‑ampere, 120/277‑volt specification grade ivory quiet type switches.

a.

Single-pole switches shall be Hubbell No. 1221‑1‑I or approved equal.

b.

Three-way switches shall be Hubbell No. 1223‑1‑I or approved equal.

2.

Single-pole key-operated switches shall meet all the requirements of the single-pole toggle switch. Single-pole key-operated switches shall be Hubbell No. 1221‑L or approved equal.

3.

Mullion single-pole switches shall meet all the requirements of the single-pole toggle switch.

C.

Device plates and covers

1.

Device plates for indoor concealed wiring shall be brush finish stainless steel.

2. Device plates for indoor exposed wiring shall be stamped sheet metal steel.

3. Weatherproof receptacles shall have device-mounted snap covers, UL listed for wet locations.

4. Where shown on the drawings, outdoor weatherproof covers shall be raintight NEMA 3R rated and shall meet NEC and OSHA requirements for "While in Use" applications.

5. Device plates for mullion switches shall match the mullion as nearly as possible.

6. Device plates shall be manufactured by Hubbell, Byrant, P & S or Leviton.

2.7

LIGHTING AND BRANCH CIRCUIT PANELBOARDS

A. Panelboards shall have the voltage, number of phases and wires, and current ratings as shown on the drawings.

B. Panelboards shall be circuit breaker panelboards conforming to the requirements of UL 67, UL 50, NEMA No. PB1 and the NEC. Each panelboard shall be mounted in a galvanized sheet-metal cabinet with a removable door-in-door front panel complete with hinged doors, latch and lock. All locks shall be keyed the same and two keys shall be provided for each lock. Cabinets shall have means for securing, supporting and adjusting panelboard front. There shall be no sharp points or edges inside cabinets.

C. Bus bars shall be copper. Bus bar taps shall be arranged for sequence phasing of the branch circuit devices. Neutral bars, where specified, shall be full size, insulated from the cabinet and mounted at the opposite end of the panel from the mains. A bare, uninsulated grounding bar, brazed to the cabinet, shall be provided where indicated. Bus bars for the mains shall have pressure-type lug connections for attaching feeders unless a main protective device is indicated. Where paralleled conductors feed the panel, lugs shall be provided for each conductor. Where spaces are indicated, the bus shall have all applicable accessories provided to enable a breaker to be readily installed.

D. Branch circuit breakers shall be as specified in Paragraph 2.5 (B).

E. A directory frame and card having a transparent cover shall be furnished on each door, neatly typed to indicate loads.

F. Panelboards shall be Square D , GE, Seimans or approved equal..

2.8

GROUNDING

A. Grounding conductors shall be copper, stranded, soft drawn or soft annealed.

B. Ground clamps for connecting grounding electrode conductors to copper, brass or lead pipes shall be made of copper, and if pipes are of steel or iron, the ground clamps shall be made of galvanized iron. These clamps shall be designed to provide permanent and positive pressure and to avoid mechanical injury to the pipes.

C. Grounding conductors and jumpers shall be connected to each other and to items to be grounded by means of pressure connectors, clamps and/or other suitable methods approved by the Engineer.

D. All grounding conductor connections made below grade shall be made using an exothermic welded connection. All below-grade connections shall be "Cadweld," "Thermoweld" or approved equal.

E. Ground rods shall be a minimum of 3/4‑inch diameter by 10 feet long, copper-clad steel-core.

F. All concrete-encased or direct-buried underground electrode conductors shall be of stranded copper.

G. All equipment grounding conductors installed in conduits shall be insulated.

PART 3

EXECUTION

3.1

GENERAL

The Contractor shall study all construction documents and shall carefully lay out all work in advance of fabrication and erection in order to meet requirements of limited spaces. Where conflicts occur, the Contractor shall meet with all involved trades and resolve the conflict prior to erection of any work in the area involved.

3.2

CONDUIT

A. Above-grade conduit

1. Conduits located indoors and not subject to physical damage shall be electrical metallic tubing (EMT).

2. Conduits located outdoors, or subject to physical damage, shall be rigid galvanized steel (RGS).

3. Flexible metallic conduit (FMC) shall be used in dry locations and liquid tight flexible metal conduit (LTFMC) shall be used in wet locations to extend conduit connections to motors, lighting fixtures, transformers, etc. The length of flexible conduit shall not exceed 24 inches. The length shall not exceed 72 inches for recessed lighting fixtures only.

4. Where to Conceal: Conduits shall be concealed in all finished parts of the building. Conduits shall be concealed in pipe chases, walls, furred spaces, topping or above ceilings unless otherwise shown. All conduits shall be routed parallel or perpendicular to the building lines. No diagonal runs will be permitted.

5. Where to Expose: Conduits may be exposed in mechanical/electrical rooms, duct and piping chases, under-floor crawl spaces, and locations shown on the drawings. All exposed conduit shall be run in the neatest, most inconspicuous manner, and parallel or perpendicular to the building lines. No exposed diagonal runs will be permitted. The Contractor shall run all conduit in a manner satisfactory to the Contracting Officer.

6. Conduits shall be securely supported to building structure at intervals of not more than 8 feet. Conduits shall be fastened in place with galvanized steel clamps or pipe straps, hangers, 3/8‑inch-diameter-minimum rods or trapeze. No perforated steel tape is permitted. Supports of structural steel or manufactured framing members shall be provided with all necessary rods, anchors, clamps, spacers and bolts. Conduits above removable ceiling panels shall allow sufficient clearance for panel removal or insertion. Conduits of any size shall not be supported from ceiling hangers or light fixture hangers. Conduit shall not be supported from piping or mechanical equipment unless specifically shown on plans. Allow 7 feet of headroom clearance.

7. Fasteners for conduit supports shall be self-drilling self-tapping screws in metal; wood screws in wood; or threaded expansion anchors or inserts in masonry or concrete. Wooden, plastic or lead inserts, or power-actuated anchors, will not be acceptable.

8. Rigid galvanized steel conduit shall be made up to boxes and equipment with double locknuts and shall have insulated bushings installed. Grounding continuity shall be maintained.

9. All roof penetrations shall be properly sleeved, sealed and flashed for complete waterproofing. In lieu of the above, approved factory-fabricated watertight entrance glands shall be used.

10. In no case shall a raceway be run within 6 inches of steam or hot water pipes, breechings, flues or other high-temperature surfaces.

11. Provide sleeves in new concrete or masonry walls for passage of conduits. Waterproof all sleeves where required.

B. Below-grade conduit

A. Nonencased, direct-buried conduits in or below slabs-on-grade, in earth, or in gravel shall be rigid, Schedule 40, polyvinyl chloride (PVC).

B. Conduit encased in concrete shall be PVC thinwall.

C. All offsets and ells shall be rigid galvanized steel, wrapped with tape as specified below.

D. All conduit risers shall be rigid galvanized steel.

E. All underground conduits shall be installed a minimum of 24 inches below grade unless shown otherwise on the drawings.

F. Metal conduits and fittings buried underground shall be carefully wrapped with half-lapped 3M No. 51 "Scotchrap," or approved equal, vinyl tape, with wrapping extending at least 3 inches beyond the edge of any exposed metal.

G. Where conduits are installed in slabs, conduits shall be set in position as soon as the forms are in place and in such manner as not to impair the strength of the slab. For exact locations, see architectural sections and locate as directed by Contracting Officer with respect to the reinforcing steel.

H. Where concrete encasement is shown on the drawings, provide a minimum of 3 inches concrete envelope above, below and at sides of ductbank. Provide 3 inches of concrete between conduits. Concrete shall be 2,500 psi class concrete. For multiple rows of conduit, provide plastic spacers on maximum 10‑foot centers to maintain horizontal and vertical spacing of conduits.

C. General

1. To prevent the accumulation of water, dirt or concrete in conduit during work, conduit ends shall be sealed by use of metallic "pennies" or resilient plastic sealing caps during construction until wire is pulled. Properly cap spare and empty conduit systems, stubbed up from below grade or from below floor level, with permanent caps.

2. Horizontal runs of conduit shall be installed to provide a natural drain for condensation without pockets or traps where moisture may collect. All conduits shall be blown out and swabbed out before pulling in wire.

3. Furnish and install a polypropylene pull cord in every empty raceway. Identify each end of pull wire with tags with complete information as to location of the other end of the wire.

4. Provide expansion couplings where conduits cross expansion joints, and where required by the NEC.

3.3

JUNCTION, PULL AND DEVICE BOXES

A. Provide a standard access panel having a hinged metal door neatly fitted into a flush metal trim, where a junction box is located above hard ceilings or in finished walls. Coordinate the location and type with the Contracting Officer.

B. Verify final location of all boxes with Contracting Officer prior to rough-in.

C. Where more than one switch or device is located at the same location, multi-gang boxes and covers shall be provided.

D. Back-to-back device boxes in a wall are not permitted. Provide a minimum 12‑inch-long nipple to offset boxes on opposite sides of a common wall to minimize sound transmission.

E. Provide proper throats and extension rings to ensure that device boxes are within 1/4 inch of finished wall surfaces.

F. Identify all circuits located in junction, pull and device boxes per Section 16010.

3.4

CONDUCTORS

A. All conductors shall be installed in conduit unless noted or specified otherwise.

B. Maximum branch circuit homerun lengths shall be as follows:

C. A UL-approved cable pulling compound shall be used as a lubricant where necessary. No materials which may be injurious to the wire covering or insulation shall be used.

D. Conductors pulled into a wrong raceway or cut too short for termination shall be replaced. Conductors shall not be reinstalled after removal from a raceway.

E. Mains and feeders shall run their entire length in continuous pieces without joints or splices unless otherwise shown.

F. Joints in branch circuits shall occur only where such circuits divide as shown on the plans. No splices shall be made in submersible locations.

G. Splices and taps shall not be made in any conductor except at outlet boxes, pull boxes or junction boxes. Splices shall not be made in conduit bodies.

H. All electrical conductor terminations shall be torque wrench or torque screwdriver tightened per UL and NEMA standards.

I. Where the bodies of fluorescent lighting fixtures are used as raceways for lighting branch circuits, conductors shall be securely clamped within the fixture body to positively prevent contact of the wires with the ballast case.

J. Wire connectors located in damp locations shall be wrapped with rubber and vinyl tape equal to Scotch No. 130 and Scotch No. 33 tape, followed by a coating of ScotchKote, or approved equal.

3.5

DISCONNECT SWITCHES

A. Install disconnect switches to maintain NEC clearances.

B. Install label inside each fused disconnect switch indicating the fuse type and ampere rating.

3.6

OVERCURRENT DEVICES

A. Verify proper fuse or circuit breaker size prior to installing.

B. Where circuit breakers are installed in existing panelboards, verify that breaker type and AIC ratings match the existing circuit breakers installed in the panel.

3.7

WIRING DEVICES

A. All mounting heights shown below are to centerline of devices.

B. Receptacles shall be installed 18 inches above finished floor unless otherwise shown.

C. Receptacles above counters shall be horizontally mounted at 42 inches above finished floor unless otherwise shown.

D. Receptacles shall generally be mounted vertically in box, set plumb and true with the ground pin receiver in the top position.

E. Switches shall be flush mounted 48 inches above finished floor unless otherwise noted.

F. Switches shall be mounted vertically, set plumb and true, so that toggle handle is "up" in the "ON" condition.

G. Switches that are indicated as adjacent to each other on the drawings shall be installed in a common junction box. Provide box dividers for 277‑volt circuits and one-piece wall plate, ganged as required. Sectionalized device plates will not be accepted.

H. All devices installed shall be installed with 6‑inch pigtails.

I. All devices shall be compatible with architectural room finishes. All devices shall be trimmed out as scheduled to the satisfaction of the Contracting Officer.

3.8

LIGHTING AND BRANCH CIRCUIT PANELBOARDS

A. Cabinets shall be set rigidly in place with fronts straight and plumb.

B. Provide type-written circuit identification card placed in door-mounted directory frame.

C. Install panelboards in areas where NEC clearances can be maintained.

D. Provide panelboard nameplates in accordance with Section 16010.

E. Panelboard mounting height shall be 6 feet to the top of trim.

3.9

GROUNDING

A. The electrical system shall be grounded in accordance with Article 250 of the NEC. All electrical equipment including conduit systems, boxes, disconnect switches, receptacles, panelboards, motors, etc. shall be grounded.

B. The service entrance groundbus shall be bonded to the building water service, building steel, ufer ground and ground rods with conductors sized per NEC Table 250‑94.

C. Resistance between any point on the grounding electrode system and any object in the vicinity, including earth and floors, shall not exceed 25 ohms. Ground resistance measurements of all ground rods shall be made in normally dry weather, not less than 24 hours after rainfall. The Contractor shall submit measured ground resistance readings to the Engineer.

D. If the ground resistance exceeds 25 ohms, additional ground rods shall be installed to lower the ground resistance to below 25 ohms.

E. The ground terminal on all convenience receptacles shall be bonded to the box and to the branch circuit grounding conductor with a bonding jumper to provide good continuity back to the source.

F. Conduits which connect to boxes, cabinets or enclosures having concentric or eccentric knockouts shall be provided with bonding jumpers sized in accordance with NEC Table 250‑95 connected between a grounding type bushing/locknut on the conduit and a groundbus or stud inside the enclosure.

G. Where grounding connections are made to conduits, cabinets, etc., metal surface contacts shall be cleaned so that there is a good ground connection.

H. All raceways shall contain a green insulated equipment grounding conductor sized per NEC 250‑95, even if not shown on the drawings.

3.10

TESTING

A. All tests shall be satisfactorily completed and accepted before final inspection or acceptance. Provide test reports for all tests. Test reports shall be bound with O & M manuals.

B. Insulation of feeder conductors shall be tested with a 1,000‑volt megger. Test each feeder conductor for a minimum acceptable ground resistance reading of 100 MEG ohms. Replace feeder conductors which do not meet the minimum reading or which differ appreciably from other feeder ground resistance readings.

C. Panelboard busbars shall be meggered prior to energizing to ensure that shorts or grounds do no exist.

D. Measure and record ground resistances in accordance with Paragraph 3.9.

E. Test each receptacle for proper phase, neutral and ground connections.

END OF SECTION

16050. - 17 H:\8348\8348003.23\Docs\B-3 Specs\Division 16\16050.doc March 18, 2005