July 22, 1994

Contract #TW0592

**SPECIAL SPECIFICATION**

**SECTION 16425**

**[SWITCHBOARDS]{.underline}**

**[PART 1 - GENERAL]{.underline} [Page]{.underline}**

1.01 Related Documents 2

1.02 Summary 2

1.03 Submittals 2

1.04 Quality Assurance 3

1.05 Delivery, Storage, and Handling 4

1.06 Extra Materials 4

**[PART 2 - PRODUCTS]{.underline}**

2.01 Manufacturers 5

2.02 Switchboards, General 5

2.03 Fabrication and Features 5

2.04 Overcurrent Protective Devices (OCPDs) 7

2.05 Instrumentation 7

2.06 Control Power 8

2.07 Ratings 8

2.08 Accessory Components and Features 8

2.09 Identification 9

**[PART 3 - EXECUTION]{.underline}**

3.01 Installation 10

3.02 Identification 11

3.03 Grounding 11

3.04 Connections 11

3.05 Field Quality Control 11

3.06 Cleaning 13

3.07 Protection 14

3.08 Demonstration 14

3.09 Commissioning 14

**SPECIAL SPECIFICATION**

**SECTION 16425**

**[SWITCHBOARDS]{.underline}**

**[PART 1 - GENERAL]{.underline}**

**1.01 [RELATED DOCUMENTS]{.underline}**

> A. Drawings and general provisions of Contract, including General and
> Supplementary Conditions and Division 1 Specification Sections, apply
> to this Section.
>
> B. Requirements of the following Division 16 Sections apply to this
> Section:
>
> 1\. \"Electrical Work.\"

**1.02 [SUMMARY]{.underline}**

> A. This Section includes low-voltage power service and distribution
> switchboards and associated auxiliary equipment rated 600 V or less.
>
> B. Related Sections: The following Division 16 sections contain
> requirements that relate to this Section:
>
> 1\. \"Overcurrent Protective Devices\" for circuit breakers, fusible
> switches, fuses, and other similar devices used in switchboards.
>
> 2\. \"Electrical Identification\" for identification and warning signs
> for switchboards and switchboard components.

**1.03 [SUBMITTALS]{.underline}**

> A. General: Submit the following in accordance with Conditions of
> Contract and Division 1 Specification Sections.
>
> B. Product data for each product and component specified.
>
> C. Shop drawings for each switchboard including dimensioned plans and
> elevations, component and device lists, and a single-line diagram
> showing main and branch bus current ratings and short-time and
> short-circuit ratings of switchboard.
>
> D. Shop drawings or other descriptive documentation of optional
> barriers specified for electrical insulation and isolation.
>
> E. Schedule of features, characteristics, ratings, and factory
> settings of individual protective devices.
>
> F. Manufacturer\'s Schematic Wiring Diagram.
>
> G. Point-to-Point Control Wiring Diagram: Differentiating between
> manufacturer-installed and field-installed wiring (may be submitted
> upon delivery of switchboard).
>
> H. Qualification data for field-testing organization certificates,
> signed by the Contractor, certifying that the organization complies
> with the requirements specified in Quality Assurance below. Include
> list of completed projects with project names, addresses, names of
> Architects and Owners, plus other information specified.
>
> I. Report of field tests and observations certified by the testing
> organization.
>
> J. Maintenance data for materials and products.

**1.04 [QUALITY ASSURANCE]{.underline}**

> A. Listing and Labeling: Provide switchboard assemblies that are
> listed and labeled.
>
> 1\. The terms \"listed\" and \"labeled\": As defined in the National
> Electrical Code, Article 100.
>
> 2\. Listing and Labeling Agency Qualifications: A \"Nationally
> Recognized Testing Laboratory\" (NRTL) as defined in OSHA Regulation
> 1910.7.
>
> B. Field-Testing Organization Qualifications: To qualify for
> acceptance, the testing organization must demonstrate, based on
> evaluation of organization-submitted criteria conforming to ASTM E
> 699, that it has the experience and capability to conduct
> satisfactorily the testing indicated.
>
> C. Sign Technician Qualifications: Engage an experienced sign
> technician who is a professional installer/painter of signs to execute
> the mimic bus.
>
> D. Electrical Component Standard: Components and installation shall
> comply with NFPA 70, \"National Electrical Code.\"
>
> E. NEMA Standard: Comply with NEMA Standard PB2, \"Deadfront
> Distribution Switchboards.\"
>
> F. UL Standard: Comply with UL 891, \"Deadfront Switchboards.\"
>
> G. Product Selection for Restricted Space: The Drawings indicate
> maximum dimensions for switchboard equipment including clearances
> between switchboard and adjacent surfaces and items. Switchboards
> having equal performance characteristics and complying with indicated
> maximum dimensions may be considered.

**1.05 [DELIVERY, STORAGE, AND HANDLING]{.underline}**

> A. Deliver in shipping splits of lengths that can be moved past
> obstructions in delivery path as indicated.
>
> B. Store so condensation will not occur on or in switchboards. Provide
> temporary heaters as required to assure avoiding condensation.
>
> C. Handle switchboards in accordance with NEMA Standard PB2.1,
> \"General Instructions for Proper Handling, Installation, Operation,
> and Maintenance of Deadfront Distribution Switchboards.\" Use
> factory-installed lifting provisions.

**1.06 [EXTRA MATERIALS]{.underline}**

> A. Spare Fuses: Six spares of each type and rating of fuse and fusible
> devices used. Include spares for:
>
> 1\. Control power fuses.
>
> B. Spare Indicating Lights: Six of each type installed.
>
> C. Touch-Up Paint: Three half-pint containers.

**[PART 2 - PRODUCTS]{.underline}**

**2.01 [MANUFACTURERS]{.underline}**

> A. Available Manufacturers: Subject to compliance with requirements,
> manufacturers offering products that may be incorporated in the Work
> include, but are not limited to, the following:
>
> B. Manufacturers: Subject to compliance with requirements, provide
> products by the following:
>
> 1\. ABB Power Distribution, Inc.
>
> 2\. Challenger Electrical Equipment Corp.
>
> 3\. General Electric Co.
>
> 4\. Siemens Energy & Automation, Inc.
>
> 5\. Square D Co.
>
> 6\. Westinghouse Electric Corp.

**2.02 [SWITCHBOARDS, GENERAL]{.underline}**

> A. Description: Front-connected, front-accessible, with panel-mounted
> main device, panel-mounted branches, and sections rear aligned.
>
> B. Description: Front-connected, front-accessible, with fixed,
> individually mounted main device, panel-mounted branches, and sections
> rear aligned.
>
> C. Description: Front- and side-accessible section for fixed,
> individually mounted main device, panel-mounted branches, and sections
> rear aligned.
>
> D. Description: Front- and rear-accessible sections, front and rear
> aligned, with features as follows:
>
> 1\. Main Device: Drawout mounted.
>
> 2\. Branch Devices: Panel mounted.
>
> E. Barriers: Between adjacent switchboard sections.
>
> 1\. Insulation and isolation for main and vertical buses of feeder
> sections.
>
> 2\. Insulation and isolation for main bus and vertical bus.

**2.03 [FABRICATION AND FEATURES]{.underline}**

> A. Enclosure Finish for Indoor Units: Manufacture standard gray finish
> over a rust inhibiting primer on phosphatizing treated metal surface.
> Provide painted surfaces that conform to IEEE C37.20.1, \"Standard for
> Metal-Enclosed Low-Voltage Power Circuit Breaker Switchgear,\"
> paragraph 5.2.8.
>
> B. Bus Transition and Incoming Line Pull Sections: Match and align
> with basic switchboard.
>
> C. Removable Hinged Rear Covers: Secured by captive thumb screws, for
> access to rear interior of switchboard.
>
> D. Hinged Front Panels: Provide to allow access to breaker, metering,
> accessory, and blank compartments.
>
> E. Pull Box on Top of Switchboard: Provide where required by
> installation conditions, and include the following features:
>
> 1\. Adequate ventilation to maintain air temperature in pull box
> within same limits as switchboard.
>
> 2\. Set back from front to clear circuit-breaker removal mechanism.
>
> 3\. Removable covers forming top, front, and sides. Top covers at rear
> easily removable for drilling and cutting.
>
> 4\. Bottom of insulating, fire-resistant material with separate holes
> for cable drops into switchboards.
>
> 5\. Cable supports arranged to facilitate cabling, and adequate to
> support cables indicated including those for future installation.
>
> F. Buses and Connections: Three-phase, four-wire except as otherwise
> indicated. Features as follows:
>
> 1\. Phase and Neutral Bus Material: Hard-drawn copper of 98 percent
> conductivity with feeder circuit-breaker line connections.
>
> 2\. At load terminals of feeder breakers, provide silver-plated copper
> bus extensions equipped with pressure terminal connectors for outgoing
> circuit conductors.
>
> 3\. Ground Bus: 1/4-inch by 2-inch minimum size, hard-drawn copper of
> 98 percent conductivity, and equipped with pressure connector
> terminations for feeder- and branch-circuit ground conductors. For
> busway feeders extend insulated equipment grounding cable to busway
> ground connection and support cable at intervals in vertical run.
>
> 4\. Supports and Bracing for Buses: Adequate strength for 30, 000 A
> short-circuit currents.
>
> 5\. Contact Surfaces of Buses: Silver plated.
>
> 6\. Main Phase Buses, Neutral Bus, and Equipment Ground Bus: Uniform
> capacity the entire length of the switchboard main and distribution
> sections. Provide for future extensions from either end by means of
> bolt holes or other approved method and connecting links.
>
> 7\. Isolation Barrier Access Provisions: Permit checking bus bolt
> tightness.
>
> 8\. Neutral Buses: 50 percent of the ampacity of the phase buses
> except as indicated, equipped with pressure connector terminations for
> outgoing circuit neutral cables. Provide braced neutral bus extensions
> for busway feeders with neutral conductors.
>
> G. Bus Bar Insulation: Factory-applied, flame-retardant, 105 deg C
> minimum tape wrapping of individual bus bars or flame-retardant,
> spray-applied insulation of the same temperature rating.
>
> 1\. Sprayed Insulation Thickness: 3 mils, minimum.
>
> 2\. Bolted Bus Joints: Insulate with joint covers after assembly. Use
> secure covers that are easily removed and reinstalled.
>
> 3\. Phase Bar Load Runbacks from OCPDs: Increase insulation thickness
> where clearances prior to insulation are less than required for bare
> bus.
>
> 4\. Substitute insulation methods will be considered upon submission,
> and where they are shown to provide equivalent electrical and
> mechanical characteristics to those specified, will be found
> acceptable.

**2.04 [OVERCURRENT PROTECTIVE DEVICES (OCPDs)]{.underline}**

> A. Comply with requirements of Division 16 Section \"Overcurrent
> Protective Devices\" for types of OCPDs indicated. Provide indicated
> features, ratings, characteristics, and settings.
>
> B. Future Devices: Where provision for future overcurrent protective
> devices or space is indicated, equip compartments with mounting
> brackets, supports, bus connections, and necessary appurtenances,
> designed for the OCPD types and ampere ratings indicated for future
> installation of devices.

**2.05[INSTRUMENTATION]{.underline}**

> A. Instrument Transformers: NEMA Standard EI 21.1, \"Instrument
> Transformers for Revenue Metering 110 kV BIL and Less,\" IEEE Standard
> C57.13, \"Requirements for Instrument Transformers,\" and the
> following:
>
> 1\. Potential Transformers: Secondary voltage rating of 120 V and NEMA
> accuracy class of 0.3 with burdens of W, X, and Y.
>
> 2\. Current Transformers: Ratios as indicated and accuracy class
> suitable for connected relays, meters, and instruments.
>
> 3\. Control Power Transformers: Dry type. Separate compartments for
> units larger than 3 kV and their primary and secondary fuses.
>
> 4\. Current Transformers for Neutral and Ground Fault Current Sensing:
> Connect secondaries to ground overcurrent relays to provide selective
> tripping of bus tie and main breaker. Coordinate with feeder breaker
> ground fault protection.
>
> B. Multifunction Digital Metering Monitor: Provide Power Lodic meters
> as described and in the quantity listed on the drawings.

**2.06 [CONTROL POWER]{.underline}**

> A. General: Where electrically operated devices or ground fault relays
> requiring external power are required, provide 120-V control circuits
> supplied through secondary disconnect devices from control power
> transformer.
>
> B. Control Power Fuses: Include primary and secondary fuses for
> current-limiting and overload protection of transformer and fuses for
> protection of control circuits.
>
> C. Control Wiring: Factory-installed, complete with bundling, lacing,
> and protection. Provide flexible conductors for No. 8 AWG and smaller,
> for conductors across hinges, and for conductors for interconnections
> between shipping units.

**2.07 [RATINGS]{.underline}**

> A. Provide nominal system voltage and continuous main bus amperage as
> indicated.
>
> B. Nominal System Voltage: 480/277 V, 60 Hz.
>
> C. Main Bus Continuous: 1200 amperes.

**2.08 [ACCESSORY COMPONENTS AND FEATURES]{.underline}**

> A. Accessory Set: Include tools and miscellaneous items as required
> for overcurrent protective device test, inspection, maintenance, and
> operation.
>
> B. Portable Test Set: Arranged to permit testing of all functions of
> solid-state trip devices without removal from switchboard. Include
> relay and meter test plugs suitable for testing switchboard meters and
> switchboard class relays.
>
> C. Circuit-Breaker Removal Apparatus: Overhead breaker lifting device,
> mounted at top front of switchboard and complete with hoist and
> lifting yokes matching each drawout breaker.
>
> D. Fungus Proofing: Permanent fungicidal treatment for switchboard
> interior including instruments and instrument transformers.
>
> E. Kirk Key Interlocks: Provide kirk key interlock sysyem between
> tie-breakers and adjacent main circuit breakers. See drawing 104618E3.

**2.09 [IDENTIFICATION]{.underline}**

> A. General: Refer to Division 16 Section \"Electrical
> Identification.\" Identify units, devices, controls, and wiring with
> factory-applied labels and signs.
>
> B. Compartment Nameplates: Engraved laminated plastic or metal
> nameplate for each compartment, mounted with corrosion-resistant
> screws.

**[PART 3 - EXECUTION]{.underline}**

**3.01 [INSTALLATION]{.underline}**

> A. General: Install switchboards and accessory items in accordance
> with manufacturers\' written installation instructions and the
> following specifications:
>
> B. Anchor each switchboard assembly to two 4-inch-minimum channel-iron
> sills arranged in accordance with manufacturer\'s recommendations.
> Attach by tack welding or bolting. Level and grout sills flush with
> switchboard mounting surface.
>
> C. Strength, Spacing, and Placement of Equipment Housekeeping Pads:
> Provide a concrete membrane-waterproofed floor or pressure slab
> housekeeping pad under the switchboard, and where otherwise indicated.
> Provide 4-inch channel sills specified above in the pad. Fabricate
> pads as follows:
>
> 1\. Coordinate size of equipment bases with actual unit sizes
> provided. Fabricate base 4 inches larger in both directions than the
> overall dimensions of the supported unit.
>
> 2\. Form concrete pads with ASTM A36 steel channels; size and location
> as indicated. Miter and weld corners and provide cross bracing. Anchor
> or key to floor slab.
>
> 3\. Form concrete pads with framing lumber with form release
> compounds. Chamfer top edge and corners of pad.
>
> 4\. Install reinforcing bars, tied to frame, and place anchor bolts
> and sleeves to facilitate securing units.
>
> 5\. Place concrete and allow to cure before installation of units. Use
> Portland cement that conforms to ASTM C 150, 4000-psi compressive
> strength, and normal weight aggregate.
>
> 6\. Clean exposed steel form in accordance with SSPC Surface
> Preparation Specifications SP 2 or SP 3, and apply 2 coats of
> rust-preventive metal primer.
>
> 7\. Footings: For outdoor switchboard pads, provide footings as
> indicated.
>
> D. Temporary Lifting Provisions: Remove temporary lifting eyes,
> channels, and brackets and temporary blocking of moving parts from
> switchboard units and components.
>
> E. Operating Instructions: Frame and mount printed, basic operating
> instructions for switchboards, including control and key interlocking
> sequences, and emergency procedures. Fabricate frame of finished wood
> or metal and cover instructions with clear acrylic plastic. Mount on
> the front of the switchboards.

**3.02 [IDENTIFICATION]{.underline}**

> A. Identify field-installed wiring and components and provide warning
> signs as specified in Division 16 Section \"Electrical
> Identification.\"

**3.03 [GROUNDING]{.underline}**

> A. Connections: As indicated. Tighten connections to comply with
> tightening torques specified in UL 486A and 486B.
>
> B. Ground equipment to main electrical ground bus indicated. Provide
> minimum 5-ohm ground resistance at switchboard location.

**3.04 [CONNECTIONS]{.underline}**

> A. Tighten switchboard bus joint bolts and electrical connector and
> terminal bolts in accordance with manufacturer\'s published
> torque-tightening values. Where manufacturer\'s torque values are not
> stated, use those specified in UL 486A and UL 486B.

**3.05 [FIELD QUALITY CONTROL]{.underline}**

> A. General: Comply with applicable standards of the InterNational
> Electrical Testing Association (INETA) including Standard ATS,
> \"Acceptance Testing Specifications for Electrical Power Distribution
> Equipment and Systems.\"
>
> B. Manufacturer\'s Field Services: Arrange and pay for the services of
> a factory-authorized service representative to supervise the
> pretesting and adjustment of switchboard components for a total or 5
> working days.
>
> C. Independent Testing Organization: Arrange and pay for the services
> of an independent electrical testing organization to perform quality
> control electrical testing and calibration, visual and mechanical
> inspections, and tests of overcurrent protective devices switchboards.
>
> D. Pretesting: Upon completing installation of the system, perform the
> following preparations for tests:
>
> 1\. Make insulation resistance tests of switchboard buses, components,
> and connecting supply, feeder, and control circuits.
>
> 2\. Make continuity tests of circuits.
>
> 3\. Provide set of Contract Documents to test organization. Include
> full updating on final system configuration and parameters where they
> supplement or differ from those indicated in original Contract
> Documents.
>
> 4\. Provide manufacturer\'s instructions for installation and testing
> of switchboard to test organization.
>
> E. Quality Control Testing Program: Conform to the following:
>
> 1\. Program Objectives: To assure switchboard installation meets
> specified requirements, is operational within specified tolerances,
> provides appropriate protection for systems and equipment, and is
> suitable for energizing.
>
> 2\. Procedures: Make field tests and inspections and prepare
> switchboard for satisfactory operation in accordance with
> manufacturer\'s recommendations and these specifications.
>
> 3\. Schedule tests and notify Architect at least one week in advance
> of test commencement.
>
> 4\. Reports: Prepare written reports of test results and observations.
> Report defective materials and workmanship. Include complete records
> of adjustments and remedial efforts.
>
> 5\. Labeling: Upon satisfactory completion of tests and related
> effort. Apply a label to tested components indicating test results,
> person responsible, and date.
>
> 6\. Protective Device Ratings and Settings: Verify indicated ratings
> and settings and make the final system adjustments of OCPDs in
> accordance with Division 16 Section \"Overcurrent Protection
> Devices.\"
>
> F. Visual and Mechanical Inspections: Include the following
> inspections and related work:
>
> 1\. Inspect for defects and physical damage, testing laboratory,
> labels, and nameplate compliance with up-to-date circuit connections.
>
> 2\. Verify that potential transformers, including their overcurrent
> protection and current transformers, meet specified requirements.
>
> 3\. Perform operational test and exercise of mechanical components and
> other operable devices in accordance with manufacturer\'s instruction
> manual.
>
> 4\. Check switchboard anchorage, area clearances, and alignment and
> fit of components.
>
> 5\. Check tightness of bolted electrical connections with calibrated
> torque wrench. Refer to manufacturer\'s instructions for proper torque
> values.
>
> 6\. Clean switchboard interior and exterior using manufacturer\'s
> approved methods and materials.
>
> 7\. Perform visual and mechanical inspection and related work for
> OCPDs as specified in Section \"Overcurrent Protective Devices.\"
>
> G. Electrical Tests: Include the following items performed in
> accordance with manufacturer\'s instruction:
>
> 1\. Insulation resistance test of buses and portions of control wiring
> that disconnect from solid state devices through normal disconnecting
> features. Insulation resistance less than 100 megohms is not
> acceptable.
>
> 2\. Ratio and polarity tests on current and voltage transformers.
>
> 3\. Ground resistance test on system and equipment ground connections.
>
> 4\. Calibrate ammeters and voltmeters at midscale. Use check
> instruments with documented up-to-date calibration traceable to NIST
> standards.
>
> 5\. Verify appropriate capacity, overcurrent protection, and operating
> voltage of control power elements including control power transformer
> and control power wiring.
>
> 6\. Calibrate watthour and demand meters to 0.5 percent, and verify
> meter multipliers. Use check instruments with documented up-to-date
> calibration traceable to NIST standards.
>
> 7\. Check phasing of alternate supply sources to the same bus.
>
> 8\. Test overcurrent protective devices as specified in Section
> \"Overcurrent Protective Devices.\"
>
> H. Retesting: Correct deficiencies identified by tests and
> observations and retest switchboards. Verify by the retests that
> switchboards meet specified requirements.

**3.06 [CLEANING]{.underline}**

> A. Upon completion of installation, inspect interior and exterior of
> switchboards. Remove paint splatters and other spots, dirt, and
> debris. Touch up scratches and mars of finish to match original
> finish.

**3.07 [PROTECTION]{.underline}**

> A. Temporary Heating: Apply temporary heat in accordance with
> manufacturer\'s recommendation within each section of switchboards
> throughout periods during which the switchboard is not in a space that
> is continuously under normal control of temperature and humidity.

**3.08 [DEMONSTRATION]{.underline}**

> A. Training: Arrange and pay for the services of factory-authorized
> service representatives to demonstrate switchboards and train Owner\'s
> maintenance personnel.
>
> B. Training: Conduct a minimum of one-half day of training in
> operation and maintenance as specified under \"Instructions to Owner
> Employees\" in the Division 1 Section \"Project Closeout.\" Include
> both classroom training and hands-on equipment operation and
> maintenance procedures.
>
> C. Schedule training with at least seven days\' advance notification.

**3.09 [COMMISSIONING]{.underline}**

> A. Infrared Scanning: After Substantial Completion, but not more than
> 2 months after Final Acceptance, perform an infrared scan of
> switchboard bus joints and connections. Open or remove metal doors,
> covers, inspection plates, and barriers to make joints and connections
> accessible to a portable scanner.
>
> B. Follow-up Infrared Scanning: Perform 2 additional follow-up
> infrared scans of the same joints and connections, one 4 months after
> Substantial Completion and one 11 months after Substantial Completion.
>
> C. Instrument: Use an infrared scanning device designed to measure
> temperature or detect significant deviations from normal values.
> Provide documentation of device calibration.
>
> D. Record of Infrared Scanning: Prepare a certified report identifying
> all connections checked and describing results of scanning. Include
> notation of deficiencies detected, remedial action taken, and
> observations after remedial action.
>
> END OF SECTION 16425