General_specifications.pdf

NATIONAL PARK SERVICE

MASCOT SALOON ELECTRICAL SERVICE UPGRADES

SPECIFICATION INDEX

SKAGWAY, ALASKA

DIVISION 26 ELECTRICAL

26 05 10 Basic Materials and Methods

SECTION 26 05 10

BASIC MATERIALS AND METHODS

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PART 1 GENERAL

1.1 SCOPE: SECTION 26 05 10 ‐ BASIC MATERIALS AND METHODS

A. This Section covers general electrical requirements for Work covered under this Division.

B. All Work and Services specifically covered under this Division is supplementary to that covered under other Divisions of these Contract Documents. The requirements of this Division, which are more stringent than that covered under other parts of these Contract Documents, apply to Work covered under this Division.

C. All incidental Work required but not specified under this Division shall comply with the Division in which it is specified.

D. Review the Drawings and Specifications of all other Divisions for additional Work under Division 26.

1.2 DRAWINGS

A. Unless otherwise indicated, drawing symbols conform to the applicable standards of ANSI. The Drawings (or Contract Drawings) rely heavily upon symbolic representation of the features shown, and represent exact details only so far as indicated. The following should also be kept in mind:

1. The Drawings are, to some extent, diagrammatic and are not intended to show exact details.

2. Dimensions scaled from the Drawings may vary due to tracing tolerances, printing distortion, field conditions, field changes, and other factors. For these reasons, it shall be the Contractor's responsibility to field‐verify dimensions that pertain to his work. The Contractor shall make minor relocations where necessary to resolve conflicts or present a uniform appearance. The Drawings show exact location of electrical features only where specifically dimensioned.

3. The Electrical Contractor shall review the Contract Documents of the other trades on the Project, and shall coordinate the installation of electrical features with the work of all other trades. In areas such as mechanical rooms where conflicts are likely with structural, mechanical, or other features, the electrical installation shall be performed after the other trades, and arranged to eliminate conflicts.

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4. The Drawings and Specifications are complementary to each other and what is called for by one shall be as binding as if called for by all. Discrepancies between any combination of Drawings, specification, and/or field conditions shall be promptly brought to the attention of the National Park Service for a decision.

Failure to obtain such decision before proceeding shall automatically leave the Contractor liable for all expenses necessary to correct the situation to the satisfaction of the National Park Service.

5. Provide fixtures, devices, equipment, conduit, conductors and accessories indicated on the drawings unless it is specifically indicated that the fixture, device, equipment, conduit, conductor, or accessory is existing.

1.3 GENERAL REQUIREMENTS

A. Provide all work as shown on the Drawings and in these Specifications for a complete, safe, and functional installation.

B. The Contractor is responsible for providing a complete and operating facility. The intention of the Contract Documents is to include all labor and materials, equipment, and transportation necessary or reasonably inferable as being necessary for the execution of the work. Where minor adjustments of the work are necessary for purposes of fabrication or installation of items or resolution of conflicts between items within the intent of the Contract Documents, the Contractor shall make such adjustments at no added expense to the National Park Service. Where such adjustments affect functional or aesthetic design of the work, they shall first be submitted to the National Park Service’s Representative for review and approval.

C. Unless otherwise noted, all materials shall be of new manufacture and installed before expiration of their shelf life, if applicable.

D. Materials and equipment are to be those of major and reputable manufacturers with ability to render competent and thorough service through local and regional organizations capable of expeditiously providing service, parts, and assistance.

E. Materials of similar nature, style, function, purpose and/or appearance shall be like products from the standard product line of the same manufacturer.

F. All products shall be listed and labeled by an approved national testing laboratory for their intended use and location in all cases where such products are listed and labeled.

G. The omission of express reference to any parts, supplies, services, or facilities necessary for, or incidental to, a complete installation shall not be construed as a release from furnishing such items at no additional cost to the National Park Service.

H. Any deviations from the installation shown in these Contract Documents, due to a particular manufacturer's requirements, shall be made without additional cost to the National Park Service.

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I. Verification is required of all equipment sizes and locations prior to the ordering or installation of connection materials and disconnecting equipment to ensure that the power connections are of the proper size and type, and in the proper location. Verify all electrical loads (voltage, phase, full load amperes, number and point of connections, minimum circuit ampacity, etc.) for equipment furnished under all divisions of this specification, by reviewing respective shop drawings furnished under each division. Meet with each subcontractor furnishing equipment requiring electrical service and review electrical characteristics. Report any variances from electrical characteristics noted on the drawings with the National Park Service before proceeding with rough work. Obtain and review the equipment shop drawings to determine final connection requirements before rough‐in begins for each equipment item.

J. All materials shall be installed in a neat, orderly, and secure fashion, as required by these specifications and commonly recognized standards of good workmanship. The norms for execution of the work shall be in conformity with NEC Chapter 3 and the National Electrical Contractors’ Association “National Electrical Installation Standards”, for which the National Park Service's judgment shall be final.

K. Electrical equipment shall be installed in spaces that are accessible and in a manner that allows for maintenance and replacement. Entries into spaces shall allow for the passage of equipment. Coordinate the final locations with piping, ducts and equipment of other trades to insure proper access for all trades. Coordinate location of concealed equipment, disconnects, and boxes with access panels and doors.

1.4 REPAIR OF EXISTING FEATURES

A. Where existing or previously‐completed building surfaces or other features must be cut, penetrated, or otherwise altered for the installation of electrical features, such work shall be carefully laid out and performed, and any subsequent patching or repairs that it necessitates shall be performed by skilled mechanics of the trades involved, at no additional cost to the National Park Service.

1.5 WORK INCIDENTAL TO SUBSTITUTIONS

A. When substitutions for specified Methods or materials alter the relationship between the Work actually required and that called for by the Contract Documents, the Contractor shall bear responsibility for all expenses incurred by any necessary revisions, including the Work of other trades.

1.6 REMOVAL OF ELECTRICAL WORK IN EXISTING FACILITIES

A. Where connected to or serving fixtures or equipment being removed, or incidental to the required removal of walls, ceilings, or other features, existing electrical features shall be removed as follows:

1. All abandoned wiring shall be removed back to its source of supply.

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2. Exposed items shall be removed in their entirety.

a. All abandoned exposed conduit, including all abandoned conduit above accessible ceiling finishes shall be removed back to the source of supply, or back to the connection to a still active branch. Cap and properly close all openings in remaining conduits, boxes and enclosures.

3. Concealed items may be abandoned in place if they are completely concealed by the existing construction.

a. Conduits concealed in areas not accessible or that are not being made accessible shall be removed into areas of non‐accessibility. Patch to match existing, openings in walls, ceilings, or floors left or created as a result of conduit removal.

b. Conduits that are being removed and that extend below slab on grade shall be ground flush with the top of the slab, plugged with concrete, and the slab patched to match existing.

4. Where other electrical items are fed through, supported by or attached to a removed item, reroute raceways and/or cut back building surfaces as necessary to rejoin raceways, provide new conductors as necessary, and patch and finish all damaged construction to match surrounding surfaces.

5. Salvage or disposal of removed items shall be as noted on the drawings, or as directed by the National Park Service.

B. All existing equipment left remaining shall be maintained in service. When encountered in work, whether shown on the drawings or not, protect, brace and support existing items.

If existing active electrical services are encountered that require relocation in order to execute general, electrical or mechanical work, relocate services as required and as directed without additional cost to the National Park Service. Any equipment which is not specifically indicated for removal or is not shown or noted shall remain in service.

1.7 PROTECTION AND CLEANING

A. All electrical equipment shall, during the entire duration of construction work, be protected against water, dust, debris, overspray or any other contamination, whether environmental in origin or as a result of construction work.

B. All construction dust, debris, overspray, scrap and surplus materials, etc., resulting from this Work shall be cleared away, leaving the installation in completely clean condition.

C. Clean up all equipment to factory condition. Use touch‐up paint where required. All cleaning shall be in accordance with the manufacturer’s recommendations.

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D. These cleaning requirements apply not only to exterior surfaces, but also interiors of accessible enclosures. In particular, the interiors of equipment having contacts or heat dissipating components shall be thoroughly vacuum‐cleaned prior to energizing.

1.8 SERVICE INTERRUPTIONS

A. All Work covered by this Contract shall be performed on de‐energized circuits. Where such de‐energization would deprive the National Park Service of existing service, the Contractor shall give at least 24 hours advance notice of the outage, or more if the National Park Service requires. The Contractor will not necessarily be entitled to any extra compensation or time extension for the National Park Service’s inability to grant an outage at a time convenient to the Contractor.

1.10 CODES

A. All work shall comply with the latest adopted editions of:

1. The National Electrical Code.

2. The NFPA Codes.

3. OSHA Regulations.

4. Applicable standards of NEMA, and ANSI.

5. The National Electrical Installation Standards (NEIS) by the National Electrical Contractors Association (NECA).

6. Previous editions of the above, where required by Federal, State or Local laws and regulations.

7. All applicable Federal, State and Local laws and regulations.

1.11 SUBMITTALS

A. Prior to the purchase of any materials or equipment, the Contractor shall submit for acceptance data completely describing all items intended for use in the work. This data shall include the manufacturer and identifying number or nomenclature; the manufacturer's published data as to size, capacity, power requirements and dimensions, shop drawings; and such other information as necessary to properly describe each item.

Catalog cuts indicating part numbers and fulfilling the requirements above will be considered appropriate for this application.

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PART 2 PRODUCTS

2.1 CONDUIT AND TUBING

A. Electrical Metallic Tubing shall be galvanized, with smooth interior. Acceptable manufacturers include, but are not limited to the following: Allied Tube & Conduit, J & L, Triangle, Western Tube & Conduit, Youngstown, or equal.

1. EMT shall be made up with concrete‐tight compression fittings for all areas which are not wet locations. Provide rain‐tight compression EMT fittings in exterior wet locations where this raceway is used. Compression fittings shall be steel construction. Connectors shall have insulated throats. Screw and cast fittings shall not be used.

B. Rigid Steel Conduit shall be hot‐dip galvanized, Schedule 40 Dimensions with smooth interior. Acceptable manufacturers include, but are not limited to the following: Allied Tube & Conduit, J & L, Triangle, Western Tube & Conduit, Youngstown, or equal.

1. Rigid Steel Conduit shall be made up with threaded fittings only.

2.2 CONDUCTORS AND CABLES

A. Provide 600‐volt wire and cable as shown on the Drawings and further specified herein.

All wire and cable shall be of types recognized by the latest specifications of the NEC and/or the ICEA

B. All conductors shall be copper, except as otherwise noted. Conductors No. 10 AWG and smaller shall be stranded or solid. Conductors No. 8 AWG or larger shall be stranded.

C. Branch circuit conductors shall be 600 volt insulated, and unless otherwise noted on the drawings, shall have the following types:

1. Heated indoor spaces ‐ THHN/THWN or XHHW.

2. Outdoors or other cold locations where exposed to temperatures less than 32 degrees F ‐ XHHW.

D. Nylon‐jacketed conductors such as types THHN or THWN shall not be used in any location subjected to ambient temperatures below 32 degrees F.

2.3 GROUNDING AND BONDING

A. All metal raceways, enclosures, other electrical equipment and non‐electrical equipment such as tanks and dispenser platforms that may pick up harmful potentials from the electrical system, shall be securely bonded and grounded as required by the NEC, the Drawings, and this Specification

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B. Provide a separate green equipment‐grounding‐conductor in all feeders and branch circuit conduits. Terminate each end on a suitable bus or lug.

2.4 BRANCH CIRCUIT PANELBOARDS

A. Acceptable Manufacturers

1. Acceptable manufacturers for branch circuit panelboards shall be Square D, Cutler‐Hammer, Siemens, or equal.

B. Panelboard Features

1. Branch panelboards shall be of the bolt‐on circuit breaker type, with the following features:

a. Surface mounted, as shown on the Drawings and shall be furnished with the factory standard paint finish.

b. Panelboard fronts shall not contain any visible screws or other fasteners.

Fasteners which are designed to be wedged in place by sliding sideways with a screwdriver are specifically prohibited. Fronts shall have a lip or bracket which rests on the bottom return flange of the panel enclosure, to permit the front to be held in place with one hand while fastening.

Each front shall have a hinged door with a locking latch, furnished with two keys. All locks shall be keyed alike.

c. Panelboards shall have main lugs only, unless a main circuit breaker, through‐feed lugs, or subfeed lugs are noted. Lugs shall be sized to accommodate the feeder conductors shown on the Drawings.

d. Current rating of the main buses shall be as noted on the Drawings.

Where a main circuit breaker size does not correspond to a factory standard bus size, the next larger standard size main buses shall be used.

All bus components shall be braced to withstand fault currents of the peak magnitude corresponding to the branch circuit breaker interrupting ratings shown on the Drawings. Panelboards shall be bussed full height (including bus fingers and related hardware), to allow all available branch circuit spaces to be used.

e. Cabinets shall be nominally 20 inches wide, 5‐3/4 inches deep.

f. An adequate ground bus shall be provided for all branch circuit equipment grounding conductors shown on the drawings, plus 20 percent spare.

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g. Unless otherwise noted, multi‐section panelboards shall have equal quantity of circuit positions in each section, and equal size enclosures for each section.

C. Branch Circuit Breakers

1. Panelboards shall be furnished with bolt‐on branch circuit breakers conforming in the quantity, size, number of poles, and interrupting ratings shown on the panel schedule(s). Branch circuit breakers shall be installed in the exact circuit positions shown on the panel schedule(s), unless otherwise accepted by the National Park Service.

2. Where GFI breakers are called for, they shall have a ground fault current trip level of 5mA (or 30 mA for dedicated heating cables), a "test" button on the front, and trip circuitry essentially immune to nuisance tripping due to spurious influences such as RF noise.

2.5 OVERCURRENT PROTECTIVE DEVICES

A. Circuit Breakers

1. Unless otherwise noted, circuit breakers shall be of the molded‐case thermal‐ magnetic type, with the following features:

a. Size, number of poles, and interrupting capacity as shown on the drawings. Ampere ratings shall be clearly visible, even when the breaker is installed in its appropriate enclosure.

b. Voltage rating to suit the voltage of the system on which they are used.

c. Each breaker pole shall provide both instantaneous and inverse‐time tripping, with tripping clearly indicated, and a common‐tripping tie to any other poles in the same breaker. Handle‐ties are not acceptable for this purpose.

d. Breakers shall be operated by a toggle handle and shall have a quick‐ make, quick‐break, overcenter switching mechanism that includes a trip‐ free feature so that the contacts cannot be held closed against tripping currents.

e. Circuit breakers shall be labeled or listed by an independent testing laboratory, and shall conform to the latest NEMA Standards and the short‐circuit test parameters of NEMA Publication AB 1.

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PART 3 EXECUTION

3.1 IDENTIFICATION OF ELECTRICAL EQUIPMENT

A. Panelboards, switches and circuit breakers therein, and the like shall be labeled with laminated plastic labels engraved with white letters on black background. Lettering shall be block style, 1/4‐inch tall, except where space limitations, drawing notes, or other requirements in these Specifications dictate otherwise. Labels shall be secured with pop rivets or screws. Adhesive attachment is not acceptable.

B. Terminals on strips shall be numbered with indelible markings on special strips designed for the purpose, and a diagram or typed directory shall be provided in the terminal enclosure to identify the origin, function and destination of each conductor in the enclosure.

C. All receptacle plates shall be labeled with the panel and circuit number for the branch circuit that supplies the receptacle.

D. All junction box covers shall be labeled with the panel and circuit number for the branch circuit contained within the junction box.

E. All conductors in pull or junction boxes or other enclosures shall be permanently and legibly tagged or labeled with panel and circuit numbers or other data which clearly identifies their origin, function and destination

F. All raceway systems junction boxes (except those visible in finished areas) shall be color coded by paint with color coordinated with Division 9, to indicate the raceway is part of the following systems:

1. Fire Alarm System: Red.

2. DDC System: Green.

3. 208Y/120 Volt Power: White.

G. No temporary markings are permitted to remain on equipment. Remove all temporary markings where possible. Where markings cannot be removed, repaint trims, housing, etc. to cover markings. Refinish defaced finishes.

H. Circuit Directories:

1. Branch panelboard doors shall have accurate typed circuit directory cards of the two‐column type, with odd numbers down the left, and even numbers down the right, with numbers increasing from top to bottom. Multi‐pole breakers shall be labeled with each of the single pole spaces occupied.

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2. Provide new updated typed circuit directories for all panelboards affected by the Work of this project. Each entry shall accurately and uniquely identify the specific purpose of the connected load (i.e., Lighting, Receptacles, Mechanical Equipment, etc.) in accordance with NEC 408.4.

3.2 RACEWAYS

A. All conductors shall be run in metal raceways as follows, unless otherwise noted on the Drawings.

B. Raceways shall be physically and electrically continuous from enclosure to enclosure.

Electrical continuity for nonmetallic conduits shall be assured by inclusion of an NEC‐sized grounding conductor. For metallic conduits, it shall be assured by making up all joints wrench‐tight and free of foreign materials. For conduits bushings shall be insulated type.

C. Branch Raceways ‐ Unless otherwise shown, raceways concealed in non‐concrete walls may be Electrical Metallic Tubing (EMT).

D. Raceways Buried in Ground or Under Slab or Encased in Concrete ‐ Rigid Steel Conduit

(RSC).

E. Unless otherwise indicated on the drawings, raceways may be surface mounted, or routed through the building crawlspace. Exposed raceways shall be run square with the building lines.

F. Structural members shall not be cut, drilled, or notched for raceways or other electrical features unless specifically accepted by the Owner.

3.3 CONDUCTORS AND CABLES

A. Color Coding

1. Conductors No. 6 AWG and smaller shall be color‐coded by factory pigmentation of the insulation. Larger conductors may be color‐coded by wrapping the ends with colored tape in all enclosures, except that white (or gray) and green conductors may never be phase‐taped for any use other than neutral and ground, respectively. Color‐coding throughout the entire installation shall be as follows:

Conductor Phase A Phase B Phase C Neutral Ground

208Y/120 Black Red Blue White Green

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B. Installation

1. Install cable in accordance with NECA Standards of Installation.

2. Branch circuit conductors shall be No. 12 AWG copper, except for the following:

a. Where branch circuit conductor sizes are indicated on the drawings, they shall take precedence over the foregoing. Where field conditions dictate circuit routings that increase conductor lengths beyond what would be expected from the layout shown on the drawings, they shall be submitted to the National Park Service for acceptance.

3. All conductor connections shall be made up securely with solderless pressure connectors such as setscrew lugs, wirenuts, "wingnuts", insulated tap connectors, insulation piercing tap connectors, or suitable crimp fittings. Split bolt connector shall not be used. Where the connector manufacturer does not require twisting together of conductors, conductors shall be left untwisted.

4. Use compression type connectors for copper wire splices and taps, #6 AWG and larger. Utilize heat shrink tubing of the proper voltage rating for uninsulated conductors and connectors.

5. Thoroughly clean wires before installing lugs and connectors.

6. Make splices, taps and terminations to carry full ampacity of conductors without perceptible temperature rise.

7. Terminate spare conductors with wire nuts.

8. Where stranded conductors are used, their ends shall be terminated with crimp‐ on connectors (T & B Sta‐Kon, or equal), set screw lugs, box lugs, or self‐lifting pressure terminals.

9. Flexible cords shall be connected to equipment, fixtures, boxes, or other enclosures only by means of cord‐grip bodies or other strain‐relief fittings specifically designed for the purpose.

10. Where conductors or their connectors are to be connected to metal surfaces, the surface shall first be scraped free of any paint, oxide, or other non‐conductive substances. Where there is a possibility of corrosion due to moisture or other cause, a conductive corrosion inhibitor shall be used between the conductor and the metal surface.

11. Where compression fittings are used to terminate conductors operating under 600 volts, the fitting shall have a viewport, or other approved method, so that it can be verified that the conductor is properly seated in the connector.

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12. Conductor terminations shall use the manufacturer’s recommended methods and hardware unless specifically noted otherwise.

13. Neatly train and lace wiring inside boxes, equipment and panelboards.

14. All conductors shall be protected from damage. Where the conductor or insulation is damaged, the National Park Service may require, at no cost to the National Park Service, the replacement of the entire conductor, or the implementation of an approved repair method approved by the National Park Service.

15. Provide dedicated neutral conductors to branch circuits where neutral conductors are required. Multi‐wire branch circuits are not permitted. Use of handle tied breakers to provide simultaneous disconnection of ungrounded conductors for multi‐wire branch circuits is not permitted unless specifically called out elsewhere in these contract documents.

3.4 GROUNDING

A. General

1. All metal raceways, enclosures, and other electrical equipment, as well as non‐ electrical equipment that may pick up harmful potentials from the electrical system, shall be securely bonded and grounded as required by the NEC, the Drawings, and this Specification.

2. Provide a separate, insulated equipment grounding conductor inside all feeder and branch circuit conduits.

B. Concealed Connections

1. Permanent grounding connections, where permitted by the NEC to be concealed, shall not be so concealed until inspected and accepted by the National Park Service or their authorized representative. Failure to comply with this requirement will make the contractor liable for any expenses incurred in the process of re‐exposing the connections for inspection, and subsequent repair and patching of the concealing construction, including the work of other trades. The Contractor shall schedule inspection of such connections at least one week in advance of concealment, and will not be entitled to any additional compensation or time extension for delays caused by inability of the National Park Service or their representative to be available at the desired time.

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C. Grounding Conductor Raceway Bonding

1. All grounding electrode conductors run in metal raceways shall be bonded to the raceway at both ends. At grounding electrodes, compliance with NEC requirements for conduit connection to the electrode will satisfy this requirement.

D. Concentric and Eccentric Knockouts

1. In addition to the NEC requirements for service equipment, metal raceways throughout the project shall be provided with bonding bushings and NEC‐sized bonding jumpers where they enter enclosures through concentric or eccentric knockouts, reducing washers, or other arrangements that may be disturbed by relative movement between raceway and enclosure.

E. External Bonding Jumpers

1. Where the NEC permits grounding conductors external to, but routed with, a raceway, such routing shall be accomplished by spiraling the conductor around the raceway no more than two revolutions.

F. Field Quality Control

1. Inspect grounding and bonding system conductors and connections for tightness and proper installation.

2. Grounding and bonding conductors shall be terminated using a separate terminal for each conductor.

3.5 FASTENING HARDWARE

1. All fasteners shall be tightened to within secure limits for the size of fastener and material(s) fastened. For critical applications, such as busbar connections, panelboard lugs, field installed bolt in breakers, transformer connections and breaker and ground bus connections having over a No 10 AWG conductor, a torque wrench shall be used to tighten the fasteners to the manufacturer's recommended value.

B. Fasten hangar rods, conduit clamps, and outlet and junction boxes to building structure using threaded bolts and screws.

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3.6 BRANCH CIRCUIT PANELBOARDS

A. Installation

1. Branch panelboards shall be securely fastened to the structural framing of the surrounding construction, and shall be installed plumb with the surrounding construction. Flush‐mounting panelboards shall be installed with their enclosures flush with the finished wall surface.

2. Height: 6 feet to top of panelboard.

3. Provide filler plates for unused spaces in panelboards.

4. In multi‐section panelboards, conductors shall directly enter the section to which they make connection, without being routed through other sections. Where this is not possible, the National Park Service shall be contacted for acceptance of alternate arrangements.

5. From each flush‐mounted panelboard, provide a spare 1‐inch and three spare 3/4‐inch raceways stubbed into the accessible ceiling space (attic, drop ceiling, etc., as appropriate to the job) and capped. Similarly, IF the structure has an accessible crawl space or ceiling of the floor below, also provide spare 1‐inch and three spare 3/4‐inch raceways from each panel stubbed down into it and capped.

6. Conductors shall not be spliced in panelboards.

7. All conductors shall be routed so as to pass to the outside of the deadfront support brackets and bussing equipment, and shall be provided with a minimum of 3 inches of slack after termination in their designated location.

B. Circuit Directories

1. Branch panelboard doors shall have accurate typed circuit directory cards of the two‐column type, with odd numbers down the left, and even numbers down the right, with numbers increasing from top to bottom. Multi‐pole breakers shall be labeled with each of the single pole spaces occupied. Where room numbers are used, they shall be the final assigned room numbers.

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3.7 OVERCURRENT PROTECTIVE DEVICES

1. Provide overcurrent protective devices as shown on the drawings and as specified herein.

2. Single pole breakers with handle ties are not acceptable for multi‐pole breakers.

END OF SECTION