FIRE STATION 55 June 14, 2010

Transcription

1 SECTION ELECTRICAL WIRING PART 1 - GENERAL 1.1 RELATED DOCUMENTS: 1.2 SUMMARY: The general provisions of the Contract and the requirements of Section apply to the Work specified in this Section. A. Power Wiring: 1. Provide all conductors for all electric service entrance, feeders, branch circuits and proper connections to serve all building electrical loads. 2. Make proper wiring connections to all electrical equipment and devices that require electrical connection, including all Owner-furnished equipment and all equipment furnished under other Divisions of the Specifications (mechanical, elevator, etc.). All electrical circuits and connections, disconnects, and starters shall be in accordance with this specification and with the specific equipment manufacturer's instructions. B. Control Wiring: 1. Provide a complete control wiring system for all electrical equipment and appliances, including all Owner-furnished equipment as shown on drawings. Equipment furnished under other Divisions of the Specifications (mechanical equipment, etc.) shall be properly installed with electrical circuits and connections, disconnects, starters, operator control pushbuttons, alarms, etc. as specified for each type of item. 2. Building Automation System and all BAS wiring is specified under Division 15. Provide line voltage branch circuits for control power where indicated on Electrical Drawings. Provide other line voltage HVAC control system wiring when shown on the Electrical Drawings. Control wiring not shown on the Electrical Drawings is provided under Division All domestic water pumps, house pumps, fire and jockey pumps, sewage ejector, surge tanks, sump pumps, surge tank water valve controllers, including all associated alarm circuits. 4. All switches for controls, signals, pilots, remote trip operators, raise/lower switches, remote start/stop motor control stations, and any other devices or system required. 5. Contactor, time switches, and photoelectric control systems. 6. Smoke Control Dampers: Provide fire alarm monitored relays and supervised wiring to provide signal of fire alarm condition to smoke control dampers. Refer to Section for additional requirements. 1.3 QUALITY ASSURANCE: A. Regulatory Requirements: Comply with provisions of NFPA 70 National Electrical Code: ELECTRICAL WIRING

2 B. Underwriters Laboratories: Provide components that are listed and labeled by UL. C. NEMA/ICEA: Provide components that comply with the following standards: 1.4 SUBMITTALS: 1. WC-5: Thermoplastic-Insulated Wire and Cable for the Transmission and Distribution of Electrical Energy. 2. WC-3: Rubber-insulated building wire. A. Provide submittals according to Section B. Product Data: 1. Submit manufacturer's published catalog pages and specification sheets for following products. 2. Each wire type. 3. Type MC cable fittings PART 2 - PRODUCTS VOLT WIRING SYSTEMS: A. Low Voltage: Refer to Article titled LOW VOLTAGE CLASS CIRCUITS in this Section for additional requirements. B. Wire Manufacturers: 1. Not all manufacturers listed make all types of wire specified or required. Contractor is responsible for verifying that all price quotes received and wire types submitted are from named manufacturers and also meet project specifications. 2. Aetna Insulated Wire Company, Alpha, Alflex Corp., AFC Cable Systems, Inc., American Insulated Wire, Anixter (distributor), AT&T Technologies, Belden, Berk-Tek, General Cable, CommScope, Inc., Encore Wire, Essex, General Cable, General Wire, Magnetek Universal, Manhattan Electric Cable, Mohawk/CDT, Montrose/CDT, NORDX/CDT, Rome Cable Corporation, Service Wire Co., Signal Cable Co., Southwire, West Penn Wire/CDT. C. Minimum Size: AWG #12 except control circuits operating at a maximum of up to 120 volts may be #14. Where wire is sized at the homerun only or if scheduled, then that size holds for the entire circuit. Where wire is not sized, and circuit protective device is rated at 20 amps, provide AWG #12 wire. If not shown on Drawings, in accordance with the National Electrical Code based on the requirements of the load served. D. Insulation: 1. Above Ground: THHN/THWN or THHN/THWN-2. ELECTRICAL WIRING

3 2. Underground: RHW, RHW-2, XHHW, or XHHW-2. Note that conduit sizes shown on Drawings are based on XHHW insulation. If Contractor proposes to use RHW, Contractor shall adjust conduit sizes as required for proper installation of the conductor with greater insulation O.D. 3. Sunlight: Insulated conductors and cables used where exposed to direct sunlight shall be listed or marked sunlight resistant. 4. Special: Where drawings indicate any other special type of insulation required by stating the Code letter type or if the application requires special insulation, then that type shall be provided. E. Conductors: 1. Soft drawn, annealed, bare (uncoated) copper, 98% conductivity. 2. All wire sizes on Drawings represent copper wire unless indicated to be aluminum by the abbreviation "AL" on the Drawings. 3. Contractor Aluminum Option: For copper conductors AWG #1/0 and larger, and "AL" is not indicated on Drawings, aluminum may be provided at the option of the Contractor if: a. the size of the feeder and conduit is increased to provide a NECacceptable installation of equal (or greater) ampacity and equal (or less) voltage drop to the copper sizes shown, and b. aluminum grounding conductors shall be sized per NEC Table , and c. aluminum wire shall not be terminated at fire pumps, generators, mechanical equipment, motor controllers or terminals of control circuit devices unless approved in written installation instructions by that equipment manufacturer, and d. all lugs shall be proper UL-listed dual-rated copper-aluminum lugs. 4. Aluminum conductors shall be Aluminum Association 8000 Series electricalgrade aluminum alloy. To wire manufacturers listed above, add Alcan Cable- Stabiloy brand aluminum conductor. 5. Aluminum conductor shall have compact stranding as defined in 1993 NEC Chapter Nine Tables 5A and 5B. 6. Install all aluminum conductor for phase, neutral and ground in each circuit and feeder for which aluminum conductor is used. Install all copper conductor for phase, neutral and ground in each circuit and feeder for which copper conductor is used. F. Conductor Makeup: 1. Solid: All wire sizes AWG #10 and smaller. 2. Stranded: All wire sizes AWG #8 and larger. G. Grounding Conductors: All grounding electrode conductors and equipment grounding conductors shall be insulated copper (as specified above) unless indicated otherwise. H. Special Purpose: Special purpose control wiring such as that used for packaged equipment, switchboards, etc., shall be a type specifically approved for the purpose and as recommended by the equipment manufacturer. ELECTRICAL WIRING

4 2.2 LOW-VOLTAGE CLASS CIRCUITS: A. General: Low-voltage class circuits are those as defined in NEC 725 Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits. For wiring to be installed as a part of an auxiliary system specified in another Section of this Specification, refer to that Section for additional requirements. B. Code Requirements: Article 725 of the National Electrical Code for the specific class circuit involved. C. Wire: 1. Minimum Size: AWG #16 minimum or larger size shown on the drawings or specified elsewhere. Where not shown or specified, provide the size required for the specific application. 2. Insulation: Thermoplastic unless required otherwise for application. In all cases, insulation shall be rated for 600 volts. 3. Conductor: Soft drawn, annealed, bare (uncoated) copper, 98% conductivity. 4. Fire Resistance of Cables: a. Class 2 and 3: All cables of Class 2 and 3 circuits shall be U.L. listed in product category QPTZ and marked as described in NEC , 51 and 53. All such cable shall be Type CL2 or CL3. In addition, riser cables shall be Type CL2R (or CL3R) and plenum cables shall be labeled Type CL2P (or CL3P). b. Communication Cable: Refer to Section TELECOMMUNICATIONS PATHWAYS. c. Fire Alarm Cable: Refer to Section FIRE ALARM SYSTEM. d. Optical Fiber Cable: Refer to Article in this Section. 5. Manufacturers: Same as manufacturers listed for 600 Volt wiring systems. PART 3 - EXECUTION 3.1 INSTALLATION: A. Wire Pull: 1. All wiring shall be installed in approved raceway and enclosures. Raceway run shall be completely installed and free of any foreign objects before pulling or installing wire. No wire shall be pulled into conduit which terminates in large distribution equipment until equipment has been anchored into place. Cleaning agents shall have no deleterious effect on conductor coverings. 2. Pulling Lubricants: All pulling lubricants shall be listed in UL Electrical Construction Materials Directory (Green Book) under category WIRE-PULLING COMPOUNDS (ZOKZ). Lubricants shall have no deleterious effects on physical and electrical properties of wire and cable jackets. Wire lube products of 3M, American Polywater Ideal or approved equal. 3. Rough-Ins for Future Connections: Where wire is indicated to be installed, but the connection is indicated "future" or "by others", Contractor shall leave a minimum of 3' of "pigtail" at a junction box, tape the ends of the conductors, ELECTRICAL WIRING

5 and cover the junction box, unless otherwise instructed on the drawings. B. Wire and Cable Terminations, Splices, and Taps: 1. General: Comply with NEC All materials used to terminate, splice or tap conductors shall be designed for, properly sized for, and U.L. listed for the specific application and conductors involved. Install in strict accordance with the manufacturer's recommendations, using the manufacturer's recommended tools. Where taps are required on conductors sized #6 and larger, Contractor shall not sever the "main" or "feed through" conductor, but shall provide "tee" or "parallel" type connectors for connection of the tapping conductor. 2. Junctions: All wire and cable in conduit shall be continuous without taps or splices. Install junctions for taps and splices only in approved boxes and enclosures and comply with NEC (a). Provide raceway systems so that the fewest possible junctions can be installed as is feasible and practical. 3. Wire Connectors in Corrosive Areas: Connectors shall be IDEAL Twister DB Plus brand, DryConn brand of King Innovation, or approved equal. Provide silicone grease filled wire connectors when wire connectors are installed on AWG #8 and smaller wire sizes in the following areas: a. All well-light luminaires installed flush in grade outdoors. b. All outdoor signs. c. All outdoor floodlights mounted at grade level. d. All lighting, switch outlets, and receptacle outlets in the pool area, pump room and other areas with chlorine air environment. 4. All Wires AWG #8 or Smaller: a. Power Circuits: Insulated thermoplastic body, solderless live-spring mechanical twist-on wire connectors. 3M Electrical Products 2-color "Scotchlok 2" and original "Scotchlok", Ideal Wing-Nut, Twister, Twister PRO and B-CAP brands, NSI Industries Easy-Twist Winged Wire Screw-On Connectors, or approved equal. b. Control Circuits: As described for power circuits above, except terminations at equipment shall be made on properly rated terminal blocks. 5. In-Line Reducer Splice: Cables may be shown on the Drawings or otherwise required to be over-sized to accommodate voltage drop. Where required to fit into circuit breaker, fused switch, or dimmer module, install in-line reducer on cable ends. Properly terminate cable into equipment lugs. Under no circumstances shall cable be reduced below protective rating of overcurrent device protecting the feeder or circuit. Maintain access to reducers. If necessary, install additional wireway or other junction box to supplement panelboard cabinet or switch enclosure. In-line reducer shall be ILSCO RocketSplice ( , ), MAC Products Concentric Reducing Connector MSSR Series Penn-Union Corp. Insulated Inline Reducer ( ), PT-R Series ReduceR adapter plug or Slip n Sleeve compression reducer by Greaves Electric ( ), or approved equal. 6. Any Wire AWG #6 or Larger: a. All Copper Cable Splices and Taps: High strength, high-copper alloy, corrosion resistant, solderless, mechanical set-screw connector or hydraulic-crimp copper compression connectors. Apply 3M Electrical ELECTRICAL WIRING

6 Products brand "Scotchfil" putty or 3M Electrical Products Brand No. 23 tape around the connector to form a rounded base free of irregular surfaces. Over this apply two half-lapped layers of 3M Electrical Products Brand No. 33+ Scotch vinyl plastic electrical tape. Contractor Option: As an alternate method of insulating wire splices and taps, install molded joint cover 3M 8420 Series Cold Shrink Connector Insulator, Greaves Corporation Polaris Series Pre-Insulated Splice, NSi Industries Inc. Polaris Insulated Connector ( ), GelWrap or GILS kit by Raychem brand of Tyco Electronics or acceptable equivalent. b. Motor Pigtails: Splice motor pigtails with pigtail kits, 3M Electrical Products Series 5300, T & B Motor Stub Splice Insulator, GelCap kit by Raychem brand of Tyco Electronics, or acceptable equivalent. Lugs shall be long barrel, hydraulic-crimp copper compression with 1-hole or 2-hole bolt tang. c. Copper Cable Lug Connections to Equipment: Lugs shall be solderless, mechanical set-screw aluminum (AL/CU dual-rated) lug or hydrauliccrimp copper compression lug. Secure lugs to equipment as recommended by the manufacturer of the specific piece of equipment. d. Manufacturers: Amp and Raychem brands from Tyco Electronics Buchanan, Burndy, Cutler- Hammer/Westinghouse, Woodhead Dossert, G.E., Greaves ( ), Hoffman, Homac, Ideal, Ilsco MAC Products NSi Industries Inc., O.Z./Gedney, Penn-Union Corp. Plymouth Rubber, 3M, Siemens, Square D, Steel City, Thomas and Betts Color- Keyed and Blackburn brands C. Power Distribution Blocks: 1. General: Provide power distribution blocks when multiple taps must be made to a single feeder. Install blocks in listed wireway, auxiliary gutter or junction box. 2. Listed: Power distribution blocks shall be UL listed. Manufacturer shall be named in Category (QPQS) or (ZMVV) of UL Electrical Construction Materials Directory (Green Book). 3. Construction: Blocks shall have mechanical bolt lugs for both incoming main feeder and outgoing feeder tap(s). Design shall permit inserting main feeder without severing conductor(s). Configurations shall be available for parallel main and tap conductors. Provide 3 or 4-wire assembly, as required. Each block shall have insulated base and clear cover. 4. Manufacturers: Burndy "Spec-Blok" or "Electro-Rail"; Greaves pre-insulated Polaris series ( ); Homac Multi-Seal ;Ilsco PDB-Series Lay-In Power Distribution Block, SnapBloc, and ClearTap ( , sales@ilsco.com ); NSi Industries Inc. Connector- Blocks ( ), Penn-Union Corp D. Circuitry: 1. General: Branch circuits may be grouped in single raceways and share common neutral provided the following guidelines are followed, unless the ELECTRICAL WIRING

7 Drawings indicate otherwise: 2. Dedicated Circuits: Provide a neutral per phase conductor for all dedicated circuits. 3. Voltage Separation: Branch circuit and feeder conductors operating at different voltages, e.g. 120V and 277V, shall not be grouped together and installed in the same raceway. 4. Three Phase, Four Wire, Wye Systems: Provide a neutral conductor for each group of two or three sequence phased line conductors. 5. Single Phase, Three Wire Systems: Provide a neutral conductor for each group of two sequenced line conductors. 6. Three Phase, Four Wire, Delta Systems: Provide a neutral conductor for each group of two sequence phased line conductors; the high leg phase (or line) shall not be used for phase to neutral wiring connections. 7. Dimmed Circuits: Provide a separate neutral conductor for each phase conductor on lighting circuits controlled with electronic dimming. This shall include both central packaged systems and wall box type. 8. Code Requirements: In grouping conductors in a single raceway, comply with Code requirements for ampacity derating of conductors and maximum capacities of raceways. Provide larger conductors as required to maintain full ampacity of circuits as indicated on Drawings. E. Conductor Labeling: 1. Conductors shall have insulation of the proper color as listed below: SYSTEM VOLTAGE A B C NEUTRAL 120/208 Volt 3PH/4W Black Red Blue White 277/480 Volt 3PH/4W Brown Purple Yellow Gray All Voltages: Green for Grounding Conductor IG receptacles shall have green wire with yellow stripe. 2. Alternative Color Marking for AWG No.1 and Larger: Contractor may use 3M Electrical Products Scotch #35 vinyl plastic electrical tape, wrapping two turns of the appropriate color tape around each cable at all termination points and junction and pull boxes. 3. Control Wiring Systems: All terminal blocks and wire terminals shall be properly numbered for identification with T & B "E-Z-Code" Vinyl Stick-On Markers or equivalent. 4. Dedicated Neutrals: a. General: Dedicated neutrals are required where multi-wire circuits are prohibited by specification, such as for dimmer circuits, computer circuits, and other dedicated circuits. Neutral labels will assist individual circuit tracing, isolation of circuit load voltages and currents, and verification of dedicated neutral. b. Neutral Tags: When a branch circuit is required to be installed with a dedicated neutral per phase conductor, the neutral wire shall be labeled or tagged with the associated branch circuit number at every junction box, wire termination and other points of access to circuit conductors. c. Neutral label not required at final wiring device termination unless more than one neutral is present in the outlet box. ELECTRICAL WIRING

8 d. Color-mark: Color-mark each neutral with tape to match the color of the associated phase conductor. Wrap tape on neutral at same points as branch circuit tags. e. All neutral identification shall comply with NEC (D) and (A). F. Record Posting for Control Power Branch Circuits: Prepare a schedule for each 120 Volt control power branch circuit. Refer to Part One for additional requirements of normal and emergency power dedicated control power branch circuits. List all smoke dampers and other items that get power from each circuit. Use the exact name for each device assigned by the Division 15 Mechanical equipment installer. Post the schedule under Lexan adjacent to the circuit junction box in the Air Handler Room or Mechanical Room. Include a copy of the schedule in the Operation & Maintenance Manual for the Building Automation System. Purpose of the schedule is to track every item that receives power from the 120 Volt branch circuit. 3.2 METAL-CLAD PRE MFG CABLE CONNECTOR SYSTEMS (RE-LOCK): A. Installation: 1. Installation Requirements: a. Routing: Generally, cable shall be routed parallel with or perpendicular to the building lines above corridors. Parallel runs shall be tied and routed together 6. Applications: a. Luminaires (Lighting Fixtures) and Switches. B. Support: 1. General: Cable shall be supported independently and not to or from other systems. Securing cables to water lines, electrical raceways, or any other mechanical system shall not be acceptable. Cables shall not be allowed to sag more than 8" below the support system, shall not rest or sag onto the suspended ceilings, shall not contact sharp objects, and shall maintain a 6" vertical and horizontal clearance from electrical fixtures. Installation shall be neat and orderly. 2. Support Methods: Cables shall be supported from building structure. Cable shall be supported from bar joists, unistrut trapeze hangers, drop rods, allthread rods, or other hangers installed and approved for this purpose. Hangers and supports shall be spaced as required, but in no case shall spacing exceed 6' on center (NEC ). 3. Support shall be dedicated to electrical conductors and not shared with ductwork, piping, or other equipment. 4. Raceways: Raceways shall not be used as a means of support.. 5. Fastening Devices: Cables shall be securely fastened to building structure by Caddy steel cable support clips, bridal rings with clips or clamps or similar approved equal devices. Tie wire, scrap wire and tape fasteners are prohibited from Work of this Project. Protect against physical damage as required by NEC (D). ELECTRICAL WIRING

9 3.4 TESTING: 6. Cable assemblies, boxes and fittings located above a nonfire-rated floor/ceiling or roof/ceiling assembly shall not be secured to, or supported by, the ceiling assembly, including the ceiling support wires. Provide an independent means of secure support. All attachment to support wires shall be with Caddy clips, or approved equal fasteners, and not bare wire ties. 3. Ceiling grid shall not support any cable or raceway. A. General: After installation of all conductors, and before final acceptance, make required tests to determine proper functioning of all circuits. Furnish all necessary instruments required to make tests, and correct any deficiencies found. Prior to energizing, circuits shall be "ringed-out" to verify continuity and detect short circuits. Contractor shall submit to Architect written test report certifying compliance with this requirement and stating that all deficiencies have been corrected. B. Procedure: 1. Insulation resistance of all feeder conductors and all conductors AWG #1 and larger shall be tested. Each conductor shall have its insulation resistance tested after the installation is completed and all splices, taps, and connections are made except connection to source and point of final termination at distribution or utilization equipment. 2. Insulation resistance of conductors that are to operate at 600 volts or less shall be tested by using AVO Biddle (or approved equal) Megger at not less than 1000 volts dc. Resistance shall be measured from conductor to conduit (ground), conductor to conductor and conductor to neutral. Testing methodology shall conform to short-time or spot-reading procedural recommendations of AVO Biddle Instruments for specific megger being used. Acceptable insulation resistance of conductors rated at 600 volts shall not be less than one (1) megohm. 3. Conductors that do not exceed one megohm resistance during the short-time test above shall be tested using the time-resistance method (two-time method). Calculate the dielectric absorption ratio from the two readings. Test shall be performed taking 60 second/30 second reading ratio for handcranked Meggers and 10 minutes/1 minute reading ratio for power-operated Meggers. Ratios shall be acceptable and considered as passing if ratio for 60/30 test is greater than 1.4 and ratio for 10/1 test greater than Conductors that do not satisfy test requirements in (b.) or (c.) above shall be removed, replaced, and testing repeated on new cable at no additional cost to the Owner. All tests shall be performed by licensed electrician trained in the use of test instruments. Contractor shall furnish all instruments and personnel required for tests, shall tabulate readings observed and shall forward six (6) copies of test readings to Engineer for review. Reports shall clearly indicate all test failures, locations, remedies, and re-test results. 5. These test reports shall identify each feeder conductor tested, date, time, and result of test, wet and dry bulb temperature, weather conditions, relative humidity and range, test voltage, and serial number of the megger instrument used. In addition provide insulation resistance values corrected for temperature. Any conductor or splice that is found defective shall be promptly ELECTRICAL WIRING

10 removed and replaced, and additional test shall be performed. C. Disconnect Surge Protective Devices (SPD): High potential testing is prohibited across any SPD, also know as Transient Voltage Surge Suppressors (TVSS). Disconnect SPD from any conductors or equipment to be tested by ac or dc high potential testing (hi-pot testing or Meggar testing). SPD are not designed for and may not withstand the high voltages applied for the duration of high potential testing. 3.5 LOW VOLTAGE CLASS CIRCUITS: A. Raceway Installation: Provide raceway for all circuits in accordance with the Section entitled RACEWAY SYSTEMS, except no raceway is required in the following areas: 1. Accessible air handling ceiling cavities, as described in NEC (C), where cable is used that is U.L. listed as having adequate fire-resistant and low-smoke producing characteristics, per U.L. Subject Accessible, non-air handling ceiling cavities, when wiring installed is same as wiring in accessible air handling ceiling cavities. 3. Provide raceway in walls even when it is not required in ceiling cavities as outlined above. 4. Provide raceway above accessible ceiling when ceiling is higher than 11'-0" above finished floor. B. Installation Where Raceway Not Required: 1. General: Cable shall be supported independently and not to or from other systems. Securing cables to water pipe, electrical raceways, ductwork or any other mechanical system shall not be acceptable. Cables shall not be allowed to sag more than 8" below the support system, shall not rest or sag onto the suspended ceilings, shall not contact sharp objects, and shall maintain a 6" vertical and horizontal clearance from electrical fixtures. Installation shall be neat and orderly. 2. Routing: Generally, cable shall be routed parallel with or perpendicular to the building lines above corridors. Parallel runs shall be tied and routed together. Cables leaving intermediate distribution points shall be routed only through building core rooms and spaces, corridors or other public spaces until they reach the specific area of outlets that they are intended to serve. 3. Support Methods: Cables shall be supported from building structure (NEC 725.6). Cable shall be supported from bar joists, unistrut trapeze hangers, drop rods, all-thread rods, or other hangers installed and approved for this purpose. Hangers and supports shall be spaced as required, but in no case shall spacing exceed 6' on center. 4. Raceways: Raceways shall not be used as a means of support for cables (NEC (B)). 5. Fastening Devices: Cables shall be securely fastened to building structure by Caddy steel cable support clips, bridal rings with clips or clamps, Caddy WMX3/6 Series J-hanger with attachment clip, Caddy CableCAT spring steel J- hook with rounded edges for Category 5, Caddy Cat-CM Cable Support System CADDY, B-Line bridal rings with plenumrated plastic insert to protect cables from kinking B- Line wide-body J-hooks or X-hooks with steel spring closure for re-usable cable ELECTRICAL WIRING

11 entry, or similar approved equal devices. Scrap wire or tape is not acceptable. Protect against physical damage as required by NEC (D). 3.7 BRANCH CIRCUIT LENGTH: A. 150 Volts or less: Install AWG #10 when the first outlet is over 100 feet from the panelboard. B. 150 to 300 Volts: Install AWG #10 when the first outlet is over 150 feet from the panelboard. C. Branch circuit voltage drop shall not exceed 3% of branch circuit voltage rating. END OF SECTION ELECTRICAL WIRING