November 21, 1997

Contract \# **TW-0928**

**SPECIAL SPECIFICATION**

**SECTION 16425-S**

**[LOW VOLTAGE SWITCHBOARD]{.underline}**

[PART 1 ‑ GENERAL]{.underline}

1.01 Description Of Work 1

1.02 References 1 2

1.03 Submittals and Substitutions 3 4

1.04 Quality Assurance 4 5

1.05 Delivery, Storage, And Handling 6

1.06 Warranty 6 5

[PART 2 ‑ PRODUCTS]{.underline}

2.01 Switchboard, General 6 6

2.02 Fabrication And Features 7 7

2.03 Overcurrent Protective Devices 10 9

2.04 Circuit Breaker Accessories 15

2.05 Circuit Breaker Trip Devices 15

2.06 Control Power And Wiring 17

2.07 Test And Inspection Equipment 17

2.08 Identification 18

2.09 Extra Material 18

[PART 3 ‑ EXECUTION]{.underline}

3.01 Examination 18

3.02 Installation 18

3.03 Cleaning 19

3.04 Inspection And Testing 19

Appendix A and B

**SPECIAL SPECIFICATION**

**SECTION 16425-S**

**[LOW VOLTAGE SWITCHBOARD]{.underline}**

[PART 1 ‑ GENERAL]{.underline}

1.01 [DESCRIPTION OF WORK]{.underline}

A. This section includes furnishing and installing power distribution
switchboard and associated auxiliary equipment rated 600 Volt or less.

> B. Switchboard protective devices covered by this specification are:
>
> 1\. Molded case circuit breakers
>
> 2\. Insulated case circuit breakers
>
> 3\. Power circuit breakers (used as incoming main or tie breaker only)
>
> C. Related Sections: Refer to the following sections for related work:
>
> 1\. Section 01300 ‑ Submittals
>
> 2\. Section 16001 ‑ Electrical Work

1.02 [REFERENCES]{.underline}

> Comply with the following applicable standards and codes:
>
> A. National Fire Protection Association (NFPA):
>
> 1\. NFPA 70 National Electrical Code
>
> B. Underwriters Laboratories, Inc. (UL):
>
> 1\. UL 486A Wire Connectors and Wiring Lugs for Use With Copper
> Conductors
>
> 2\. UL 489 Circuit Breakers, Molded‑Case, and Circuit‑Breaker
> Enclosures
>
> 3\. UL 891 Deadfront Electrical Switchboards
>
> 4\. UL 1066 Low‑Voltage AC and DC Power Circuit Breakers Used in
> Enclosures
>
> C. National Electrical Manufacturers Association (NEMA):
>
> 1\. NEMA AB 1 Molded Case Circuit Breakers
>
> 2\. NEMA EI 21.1 Instrument Transformers for Revenue Metering 110 kV
> BIL and less
>
> 3\. NEMA PB 2 Deadfront Distribution Switchboards
>
> 4\. NEMA PB 2.1 General Instructions for Proper Handling, Installation
> and Maintenance of Deadfront Distribution Switchboards Rated 600 Volts
> or Less
>
> 5\. NEMA PB 2.2 Application Guide for Ground Fault Protective Devices
> for Equipment
>
> 6\. NEMA SG3 Low‑Voltage Power Circuit Breakers
>
> 7\. NEMA 250 Enclosures for Electrical Equipment (1,000 volts,
> maximum)
>
> D. American National Standards Institute, Inc. (ANSI):
>
> 1\. ANSI‑C12.1 Electricity Metering
>
> E. American National Standards Institute, Inc./Institute of Electrical
> and Electronics Engineers (ANSI/IEEE):
>
> 1\. ANSI/IEEE‑C37.16 Low‑voltage Power Circuit Breaker and AC Power
> Circuit Breaker Protectors ‑ Preferred Ratings, Related Requirements
> and Application Recommendations
>
> 2\. ANSI/IEEE‑C37.17 Trip Devices for AC and General Purpose DC
> Low‑Voltage Power Circuit Breaker
>
> 3\. ANSI/IEEE‑C37.20.1 Metal‑Enclosed Low‑Voltage Power Circuit
> Breaker Switchgear
>
> 4\. ANSI/IEEE‑C39.1 Requirements for Electrical Analog Indicating
> Instruments
>
> 5\. ANSI/IEEE‑C57.13 Requirements for Instrument Transformers
>
> F. InterNational Electrical Testing Association (INETA):
>
> 1\. Acceptance Testing Specifications, ATS, for Electrical Power
> Distribution Equipment and Systems

1.03 [SUBMITTALS and SUBSTITUTIONS:]{.underline}

> A. General: Submit the following in accordance with provisions of
> Section 1300-S, \"Descriptive Submittals\".
>
> B. For approval before equipment is ordered.
>
> 1\. Manufacturer\'s published data for each product and component
> furnished.
>
> 2\. Schedule of features, characteristics (including time‑current
> curves), ratings, and factory settings of individual protective
> devices.
>
> 3\. Shop drawings for proposed switchboard including, but not limited
> to, dimensioned plans and elevations, component and device lists,
> conduit entrance locations and requirements, and a single‑line diagram
> showing main and branch bus current ratings, main and branch
> protective device ratings, ground connection current rating, and
> short‑time and short‑circuit ratings of switchboard.
>
> 4\. Manufacturer\'s Schematic Wiring Diagram Point‑to‑Point Control
> Wiring Diagram. Differentiate between manufacturer‑installed and
> field‑installed wiring.
>
> 5\. Shop drawings or other descriptive documentation of barriers
> specified for electrical insulation and isolation.
>
> 6\. Shop drawings detailing the installation, when required of
> metering test switches and potential and current transformers.
>
> 7\. Shop drawings detailing the installation, when required, of Square
> D PowerLogic Circuit Monitor(s).
>
> 8\. When it is proposed to provide protective devices manufactured by
> other than those designated in schedules of overcurrent protective
> devices or show on the drawings, comply with the provisions of Section
> 16001-S (Electrical Work), part 1.03.E and submit results.
>
> 9\. When a mimic bus is required, submit diagram.
>
> 10\. If the proposed switchboard incorporates overcurrent protective
> devices or components not listed in Appendix A to this specification,
> a complete list of all special tools and test equipment to be supplied
> to Sandia National Laboratories as required by part 2.07 of this
> specification.
>
> C. Following installation of the switchboard
>
> 1\. As built drawings showing all changes made during installation.
>
> 2\. Final settings of all circuit breaker tripping devices.
>
> 3\. When a mimic bus is supplied, submit updated version of diagram
> reflecting field changes after final switchboard load connections have
> been made.
>
> 4\. Documentation of manufacturer\'s warranty
>
> 5\. Original copies of all manufacturer furnished installation,
> operating and maintenance instructions.

D. [Substitutions]{.underline}: only under provisions of Section 1600-S.

1.04 [QUALITY ASSURANCE]{.underline}

> A. Manufacturer\'s Qualifications: The manufacturer shall be regularly
> engaged in the manufacture of switchboard of the types and sizes
> required and shall have had similar products in satisfactory use in
> similar service for not less than ten (10) years.
>
> B. Listing and Labeling: The switchboard and all devices mounted
> thereon shall be listed and labeled for their intended use by a
> nationally recognized testing laboratory as defined in OSHA Regulation
> 1910.7. The terms \"listed\" and \"labeled\" are defined in the
> National Electrical Code, Article 100.
>
> C. Electrical Component Standard: Components and installation shall
> comply with NFPA 70, [National Electrical Code]{.underline}.
>
> D. Product Selection for Restricted Space: Where the drawings indicate
> maximum dimensions for equipment, including clearances between
> equipment and adjacent surfaces and items, only switchgear meeting
> specified performance characteristics and complying with indicated
> maximum dimensions will be accepted.

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

> A. Deliver in shipping splits of lengths that can be moved past
> obstructions in delivery path. Provide weather tight protection during
> shipment.
>
> B. Store so condensation will not occur on or in switchboard. Provide
> temporary heaters as required to assure avoiding condensation. Store
> NEMA Class 1 equipment indoors.
>
> C. Handle equipment in accordance with manufacturer\'s instructions
> and NEMA PB2.1.
>
> D. Use factory‑installed lifting provisions.
>
> E. Do not remove shipping blocks or braces until equipment is mounted
> in final location.

1.06 [WARRANTY]{.underline}

> A. Included: Design, material, and workmanship for switchgear and all
> associated protective devices, control systems, and metering systems.
>
> B. Period: Standard for manufacturer, but not less than 12 months
> following acceptance by owner from contractor.

[PART 2 ‑ PRODUCTS]{.underline}

2.01 [SWITCHBOARD, GENERAL]{.underline}

> A. Refer to the drawings or schedules for required circuit breaker
> types, circuit breaker ratings, circuit breaker mounting requirements,
> short circuit current rating(s) in RMS symmetrical amperes, general
> configuration of switchgear and whether or not the switchboard is
> service entrance equipment.
>
> B. Description ‑ Provide equipment with deadfront construction.
> Furnish front connected, front accessible or front and rear accessible
> as shown on the drawings or schedules.
>
> C. Barriers: Provide insulated barriers between adjacent switchgear
> sections to minimize probability of arc propagation.
>
> D. Service Conditions:
>
> 1\. Except as noted otherwise on the construction drawings,
> switchboard classified NEMA 1 shall be designed for indoor
> installation at an altitude of 6,000 feet (2,000 meters) or less.
>
> 2\. Except as noted otherwise on the construction drawings,
> switchboard classified NEMA 3R shall be designed for the following
> conditions.
>
> a\. Ambient temperature: ‑18 to 45 degrees C.
>
> b\. Altitude: 6,000 feet (2,000 meters) or less above sea level.
>
> c\. Service location: Non‑hazardous location.
>
> d\. Seismic zone: 2.
>
> e\. Environment: Outdoors in direct sunlight with full exposure to the
> weather. Occasional wind‑blown rain, snow, sand, and dust.

2.02 [FABRICATION AND FEATURES]{.underline}

> A. Provide steel enclosure constructed to NEMA classification as
> required by the drawings or schedules. Required NEMA classifications
> include.
>
> 1\. NEMA 1
>
> 2\. NEMA 1 with drip shield
>
> 3\. NEMA 3R, rain proof
>
> 4\. NEMA 3R, rain proof, with lighted walk‑in interior aisle and
> convenience outlet
>
> B. Designed and constructed to prevent the entry of rodents into the
> interior of the switchboard. For NEMA 3R - Design to prevent entry of
> dust into switchboard by using gasketing on all doors.
>
> C. Design NEMA 3R rated equipment to prevent entry of dust into
> switchboard by using gasketing on all doors and filters on all
> ventilation registers.
>
> D. Top and bottom shall have removable bolted steel plates and shall
> be suitable for conduit entry. All internal devices, line connections,
> and load connections shall be readily accessible and removable.
>
> E. Overcurrent protective devices shall not be attached to the front
> panel. Sufficient space shall be provided to accommodate specified
> accessories, separately mounted current transformers, etc. Where
> meters, switches, relays, etc., are mounted to front panels, those
> panels shall be side hinged for access with bolt closures.
>
> F. Finish:
>
> 1\. Enclosure Finish for Outdoor Units: UL 891, Paragraph 9.22 C.2,
> manufacturer\'s standard color. Undersurfaces shall additionally
> receive a corrosion‑resistant undercoating treatment. The finish
> system shall meet the requirements of tests in accordance with
> ANSI/IEEE C37.20.1, \"Standard for Metal‑Enclosed Low‑Voltage Power
> Circuit Breaker Switchgear,\" paragraph 5.2.8.
>
> 2\. Enclosure Finish for Indoor Units: Manufacturer\'s standard gray
> finish over a rust inhibiting primer on phosphatizing treated metal
> surface. Provide painted surfaces that conform to ANSI/IEEE C37.20.1,
> \"Standard for Metal‑Enclosed Low‑Voltage Power Circuit Breaker
> Switchgear,\" paragraph 5.2.8.
>
> G. Space Heaters:
>
> 1\. Application: Provide outdoor switchboard with factory‑installed,
> electric space heaters in each vertical section.
>
> 2\. Description: Space heaters shall be rated 230 Vac and operated at
> 120 Vac. Mount space heaters away from painted surfaces and provide a
> suitable mechanical guard for each space heater.
>
> 3\. Space Heater Control: Thermostat, adjustable over a minimum range
> of 0 degree C. to 25 degree C. Factory‑set to maintain switchgear
> above 10 degree C.
>
> 4\. Space Heater Power Source: Control power transformer
> factory‑mounted in switchgear with all ungrounded leads fused.
>
> H. Provide bus transition and incoming line pull sections when
> specified on the drawings or schedules. Match and align the sections
> with the basic switchboard. When bottom feed, provide cable support so
> weight of cable does not hang on cable lugs.
>
> I. When rear access is required, provide hinged rear doors for access
> to rear interior of switchboard. Secure by captive thumb screws.
>
> J. Removable Hinged Front Panels: Provide to allow access to breaker,
> metering, accessory, and blank compartments.
>
> K. Buses and Connections: Three‑phase, four‑wire except as otherwise
>
> 1\. Phase and Neutral Bus Material: Hard‑drawn copper of minimum 98
> percent conductivity.
>
> 2\. Use copper for feeder and branch circuit‑breaker line connections.
>
> 3\. Cable connections to bus shall be by lug with crimp (compression)
> connection between the barrel of the lug and the conductor and two
> hole NEMA pattern bolted connection of the lug to the bus. Use
> compression dies recommended by lug manufacturer only.
>
> L. Ground Bus: 1/4‑inch by 2‑inch (7mm X 50mm) minimum size,
> hard‑drawn copper of minimum 98 percent conductivity, and equipped
> with crimp (compression) connector terminations for feeder‑ and
> branch‑circuit ground conductors. For busway feeders extend insulated
> equipment grounding cable to busway ground connection and support
> cable in vertical run.
>
> M. Supports and Bracing for Buses: Adequate strength for specified
> short‑circuit currents.
>
> N. Contact Surfaces of Buses: Silver plated.
>
> O. Main Phase Buses, Neutral Bus, and Equipment Ground Bus: Uniform
> capacity the entire length of the switchgear main and distribution
> sections. Provide for future extensions from either end by means of
> bolt holes or other approved method and connecting links.
>
> P. Provide access to permit field torquing of all bus bolts.
>
> Q. Neutral Buses: 100 percent of the ampacity of the phase buses and
> equipped with approved terminations for all neutral cables. Provide
> braced neutral bus extension for busway feeders with neutral
> conductors.
>
> R. Surge Arresters
>
> 1\. General: Furnish with factory‑installed arresters as shown on
> drawings or schedules.
>
> S. Instrumentation and metering
>
> 1\. General: Furnish with factory‑installed metering and associated
> instrument transformers and test switches as shown on drawings or
> schedules.
>
> 2\. Include relay and meter test plugs suitable to permit testing
> switchgear meters.
>
> 3\. All instrumentation and metering wiring connected to threaded
> posts shall be terminated with ring tongue connectors.
>
> 4\. Powerlogic monitor
>
> a\. Furnish and install Square D PowerLogic circuit monitor(s), as
> required by drawings or schedules. Supply model shown on drawings or
> schedules.
>
> b\. Mount monitor(s) flush or semi‑flush on a separate instrument
> compartment hinged door when switchgear is furnished with drawout‑type
> main circuit breaker(s).
>
> c\. When switchgear is rated 480Y/277 volts, monitor(s) shall be
> furnished with the Square D potential transformers unit intended to
> permit the monitors to be directly operated at 480 volts.

2.03 [OVERCURRENT PROTECTIVE DEVICES]{.underline}

> A. General: Provide circuit breakers as integral components of
> switchboard with indicated features, ratings, characteristics, and
> settings.
>
> B. Future Devices: Where provision for future circuit breakers or
> spaces is indicated, equip compartments with mounting brackets,
> supports, bus connections and necessary appurtenances, of ampere
> ratings indicated for future installation of circuit breakers.
>
> C. Ground fault protection shall be provided for all main service
> circuit breakers when shown on the drawings or schedules or as
> required by the NEC, Article 230‑95. Ground fault protection for
> feeder circuit breakers shall only be provided when shown on the
> drawings or schedules.
>
> D. Molded‑Case Circuit Breakers
>
> 1\. General: UL 489, \"Molded Case Circuit Breakers and Circuit
> Breaker Enclosures,\" and NEMA AB 1, \"Molded Case Circuit Breakers.\"
>
> 2\. Characteristics: Frame size, trip rating, number of poles, and
> short‑circuit interrupting capacity rating as shown on drawings or
> schedules. Interrupting capacity not less than 14,000 amperes
> symmetrical. Voltage and frequency ratings same as switchboard.
>
> 3\. Tripping Device: Quick‑make, quick‑break toggle mechanism with
> inverse‑time delay and instantaneous overcurrent trip protection for
> each pole.
>
> 4\. Adjustable Instantaneous Trip Devices: On units where available
> shall be front adjustable. When furnished shall be factory adjusted to
> low‑trip‑setting current values.
>
> 5\. Current‑Limiting Circuit Breakers: Where required by drawings or
> schedules, Arranged to limit let‑through ampere‑squared‑seconds during
> fault conditions to a value less than the ampere‑squared‑seconds of
> one‑half‑cycle wave of the prospective symmetrical fault current. The
> circuit breaker shall use no fusible devices in its operation. The
> current‑limiting characteristic shall be in addition to normal
> time‑delay and instantaneous‑trip characteristics and other features
> as indicated.
>
> 6\. Circuit Breakers With Solid‑State Trip Devices: Except as noted
> otherwise on the drawings or schedules, all molded case circuit
> breakers with solid‑state trip devices shall be 100% rated. Provide
> indicated circuit breakers with solid‑state trip devices having the
> following features:
>
> a\. Ambient Compensation: Trip device insensitive to temperature
> changes between minus 20 deg C and plus 55 deg C.
>
> b\. Adjustability: Breaker ratings and trip settings shall be
> changeable by operation of controls on front panel of breaker, by
> change of plug‑in element without removing breaker from mounting, or
> by a combination of the two methods.
>
> c\. Ground‑Fault Tripping:
>
> \(1\) Furnish when required on drawings or schedules, adjustable for
> pick‑up and time‑delay values.
>
> \(2\) Suitable for incorporation in zone selective ground‑fault
> tripping schemes.
>
> 7\. Terminal Lugs: Furnish load side of circuit breaker with
> front‑connected UL listed lugs for copper cable at full frame rating.
>
> E. Insulated‑Case Circuit Breakers
>
> 1\. General: UL 489, \"Molded‑Case Circuit Breakers and Circuit
> Breaker Enclosures,\" and NEMA AB 1, \"Molded‑Case Circuit Breakers.\"
>
> 2\. Characteristics: Frame size, number of poles, and short‑circuit
> interrupting capacity rating as shown on drawings or schedules.
> Voltage and frequency ratings compatible with switchboard. Circuit
> breakers UL listed to continuously carry 100 percent of the frame
> rated current in their intended enclosure.
>
> 3\. Operating Mechanism: Mechanically or electrically operable,
> trip‑free, stored‑energy operating mechanism with the following
> features:
>
> a\. Moving Contacts Closing Speed: Independent of both control and
> operator.
>
> b\. Stored‑Energy Mechanism: True two‑step stored energy mechanism
> that shall provide a five cycle maximum closing time. Either manually
> or electrically operated as indicated on the drawings and/or
> schedules. Electrically operated breakers shall have provisions for
> optional manual charging. Furnish both manual and electrical operated
> breakers with multiply charge/close provisions capable of the
> following sequence: charge‑close‑recharge‑open‑close‑open. Provide
> capability to manually discharge the stored energy without closing the
> breaker.
>
> c\. Anti‑pump provisions shall be provided for electrically operated
> breakers.
>
> d\. Operation Counter: Include except as otherwise indicated.
>
> 4\. Auxiliary Contacts for Remote Indication: Where remote indication
> of breaker position is indicated, provide a spare auxiliary switch in
> addition to other auxiliary switches required for the normal breaker
> operation. The spare auxiliary switch shall consist of 2 Type \"a\"
> and 2 Type \"b\" stages (contacts) wired through secondary
> disconnecting devices to a terminal block in the stationary housing.
>
> 5\. Mounting: Provide draw‑out circuit breaker mounting assembly
> equipped with a heavy duty racking mechanism that properly positions
> the circuit breaker and holds it rigidly in connected,
> test/disconnected, and fully withdrawn positions and includes the
> following features:
>
> a\. Interlock arrangement, preventing movement of the circuit breaker
> to or from the connected position when it is in the closed position
> and closure of the circuit breaker unless it is in the connected,
> test/disconnected or withdrawn position.
>
> b\. Construction permitting racking an open circuit breaker to or from
> the connected, test, and disconnected positions with the associated
> compartment door closed or equivalent dead‑front barrier protection,
> and manual withdrawal to a position for removal from the structure
> with the door open.
>
> c\. Primary disconnecting devices disengaged and secondary
> disconnecting devices engaged when breaker is in test position.
>
> d\. Primary and secondary devices disengaged when circuit breaker is
> in the disconnected position.
>
> e\. Ground contact engaged when the circuit‑breaker element is in the
> connected and test positions.
>
> f\. Rotatable breaker moveable element when the breaker is in the
> withdrawn position for ease of inspection.
>
> 6\. Circuit‑Breaker Features: Include the following:
>
> a\. Charging Handle: Provide one for each breaker. Interlock manual
> close button and charging handle.

b\. Manual trip button.

> F. Power Circuit Breakers
>
> 1\. Standards: Conform to UL 1066, \"Low‑Voltage AC and DC Power
> Circuit Breakers Used in Enclosures,\" and to IEEE C37.13, \"Standard
> for Low‑Voltage AC Power Circuit Breakers Used in Enclosures.\"
>
> 2\. Characteristics: Frame size, number of poles, and short‑circuit
> interrupting capacity rating as shown on drawings or schedules.
> Voltage and frequency ratings compatible with switchboard. Circuit
> breakers listed to continuously carry 100 percent of the frame rated
> current in their intended enclosure.
>
> 3\. Operating Mechanism: Mechanically and electrically operable,
> trip‑free, stored energy operating mechanism with the following
> features:
>
> a\. control and operator.
>
> b\. Provide for manual charging of the mechanism and for slow closing
> of the contacts for inspection and adjustment.
>
> c\. Stored Energy Mechanism: Manually or electrically charged as
> indicated on the drawings or schedules. Furnish electrically operated
> only if indicated on drawings and/or schedules.
>
> d\. Operation Counter: Include except as otherwise indicated.
>
> 4\. Auxiliary Contacts for Remote Indication: Where remote indication
> of breaker position is indicated, provide a spare auxiliary switch in
> addition to other auxiliary switches required for the normal breaker
> operation. The spare auxiliary switch shall consist of 2 Type \"a\"
> and 2 Type \"b\" stages (contacts) wired through secondary
> disconnecting devices to a terminal block in the stationary housing.
>
> 5\. Mounting: Provide draw‑out circuit breaker mounting assembly
> equipped with a heavy duty racking mechanism that properly positions
> the power circuit breaker and holds it rigidly in connected,
> test/disconnected, and fully withdrawn positions and includes the
> following features:
>
> a\. Interlock arrangement preventing movement of the circuit breaker
> to or from the connected position when it is in the closed position
> and closure of the circuit breaker unless it is in the connected,
> test/disconnected or disconnected position.
>
> b\. Construction permitting racking an open circuit breaker to or from
> the connected, test, and disconnected positions with the associated
> compartment door closed (unless live parts are covered by a full
> dead‑front shield), and manual withdrawal to a position for removal
> from the structure with the door open.
>
> c\. Primary disconnecting devices disengaged and secondary
> disconnecting devices engaged when breaker is in test position.
>
> d\. Primary and secondary devices disengaged when circuit breaker is
> in the disconnected position.
>
> e\. Ground contact engaged when the circuit breaker element is in the
> connected and test positions.
>
> 6\. Circuit Breaker Features: Include the following:
>
> a\. Arc Chutes: Readily removable when the circuit breaker is in the
> disconnected position. Arranged to permit inspection of the contacts
> without removing the circuit breaker from the switchboard.
>
> b\. Charging Handle: One for each manually operated breaker.
>
> c\. Manual Trip Button: One for each manually operated breaker.

2.04 [CIRCUIT BREAKER ACCESSORIES]{.underline}

> A. Circuit‑Breaker Removal Apparatus: When drawout breakers are
> furnished, provide overhead breaker lifting device, track mounted at
> top front of switchgear and complete with hoist and lifting yokes
> matching each drawout breaker.
>
> B. Key Interlocks: When required by the drawings or schedules, arrange
> interlocking so keys are held captive at devices indicated. Where
> future key interlocking provisions are indicated, provide necessary
> mountings and hardware as required for the future installation.
>
> C. Shunt‑Trip Devices for Circuit Breakers: When required by drawings
> or schedules, arrange to trip breaker from an external source of power
> through a control switch or relay contacts.
>
> D. Padlocking Provisions: Provide padlocking provisions as follows:
>
> 1\. Equip all circuit breakers for padlocking in the open position.
>
> 2\. Equip all draw out mechanisms for the installation of a padlock to
> prevent circuit breaker insertion.
>
> 3\. Padlocking assembly shall not prevent doors from being opened
> while energized or closed.

2.05 [CIRCUIT BREAKER TRIP DEVICES FOR INSULATED‑CASE AND POWER CIRCUIT
BREAKERS:]{.underline}

> A. Multi‑function devices: True RMS sensing, microprocessor based,
> solid‑state overcurrent trip device system that includes one or more
> integrally mounted current transformer or sensor per phase, a release
> mechanism, and the following features:
>
> 1\. Functions: Long‑time‑delay, short‑time‑delay, and
> instantaneous‑trip functions, which are independent of each other in
> both action and adjustment or other combination of functions if shown
> on the drawings or schedules.
>
> 2\. Temperature compensation to assure accuracy and calibration
> stability from minus 20 deg C to plus 55 deg C.
>
> 3\. Field‑adjustable time‑current characteristics while breaker is
> energized and closed.
>
> 4\. Current Adjustability: Effected by operating controls on front
> panel or by changing plug‑in elements or current transformers or
> sensors or a combination of these methods.
>
> 5\. Three bands for long‑time‑ and short‑time‑delay functions marked
> \"minimum,\" \"intermediate,\" and \"maximum.\"
>
> 6\. Pickup points for long‑time, short‑time and instantaneous‑trip
> functions as shown on drawings or schedules. If shown on drawings or
> schedules, furnish short‑time‑trip function with switchable
> ampere‑squared‑seconds capability.
>
> 7\. Ground fault protection: Where indicated on drawing or schedules,
> provide ground fault protection incorporating:
>
> a Minimum of three short‑time‑delay settings and three trip‑time‑delay
> bands.
>
> b\. Adjustable current pickup.
>
> c\. When required, suitable for incorporation in zone selective
> ground‑fault tripping schemes.
>
> d\. Provide with both fixed time delay and tampere‑squared‑seconds
> settings.
>
> 8\. Trip Indication: Labeled lights or mechanical indicators on trip
> device indicating type of fault or overload causing breaker trip. If
> lights are used, integral power source shall maintain indication for
> 60 hours, minimum.
>
> 9\. Adjustable‑Time‑Delay Undervoltage Trip Devices: Provide when
> indicated on drawings or schedules.
>
> 10\. Arranged to permit testing of all functions of solid‑state rip
> devices without removal from switchgear.
>
> 11\. Arrange to permit viewing and adjustment of all adjustable trip
> settings and all trip indications without having to open circuit
> breaker compartment doors.
>
> 12\. Provide clear, sealable cover over adjustments.
>
> B. Single‑function: Solid‑state or electro‑mechanical.
>
> 1\. Furnish device(s) as required by drawings or schedules.
>
> 2\. Arranged to permit testing of all functions without removal from
> switchgear.

2.06 [CONTROL POWER AND WIRING]{.underline}

> A. General: When required, provide control power transformer(s) as
> shown on the drawings or schedules.
>
> B. Control Power Transformers: Dry type. Separate compartments for
> units larger than 3 kVA and their primary and secondary fuses.
>
> C. Control Power Fuses: Include primary and secondary fuses for fault
> and overload protection of transformer and control circuits.
> Interrupting capability of primary fuses not less than interrupting
> capability of main circuit breaker. Provide nameplate with fuse type
> and rating located at each fuse block. Fuses NEMA RK‑5.
>
> D. Electrically Interlocked Main and Tie Circuit Breakers: When
> required by the drawings, provide two control power transformers in
> separate compartments with necessary interlocking relays. Connect the
> primary of each control power transformer at the line side of the
> associated main current breaker. Connect the 120 volt secondaries
> through a relay or relays as a control bus to effect a fail‑safe
> automatic transfer scheme.
>
> E. Control Wiring: Factory‑installed, complete with bundling, lacing,
> and protection. Switchboard type SIS, stranded copper, with minimum
> size of #14 AWG (2.5 mm2).
>
> F. Terminal Blocks: Number terminal blocks and wires as shown on
> construction drawings or schedules or as shown on approved shop
> drawings. Include at least 20% spare terminals.
>
> G. Where control wiring is connected to threaded posts, terminate
> conductors with ring tongue connectors.

2.07 [TEST AND INSPECTION EQUIPMENT]{.underline}

> If the proposed switchboard incorporates overcurrent protective
> devices or components not listed in Appendix A to this specification,
> furnish Sandia National Laboratories with all special tools and test
> equipment necessary for device test, inspection, maintenance, and
> operation.

2.08 [IDENTIFICATION]{.underline}

> A. General: Identify units, devices, controls, and wiring with
> factory‑applied labels and signs.
>
> B. Compartment Nameplates: Furnish and install nameplates as shown on
> the drawings or schedules.

2.09 [EXTRA MATERIALS]{.underline}

> A. Spare Fuses: Where the following fuses are furnished with
> switchboard, include six spares of each type and rating of fuse used.
>
> 1\. Potential transformer fuses.
>
> 2\. Control Power transformer fuses.
>
> B. Spare Indicating Lights: When furnished with switchgear, provide
> six of each type installed. Spares are not required for light emitting
> diodes (LEDs).
>
> C. Touch‑up Paint: One half‑pint net content minimum aerosol can of
> paint for touch‑up

[PART 3 ‑ EXECUTION]{.underline}

3.01 [EXAMINATION]{.underline}

> A. Thoroughly inspect switchgear to ensure conformance with
> specifications and approved shop drawings.
>
> B. Fully document all shipping damage. Arrange for any necessary
> repairs as approved by the Sandia Designated Representative.

3.02 [INSTALLATION]{.underline}

> A. General: Install switchboard and accessory items in accordance with
> the drawings, manufacturers\' written installation instructions, NEC
> required clearances and this section.
>
> B. Temporary Lifting Provisions: Remove temporary lifting eyes,
> channels, and brackets and temporary blocking of moving parts from
> switchboard units and components.
>
> C. 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. For NEMA 1
> switchboard, mount on the front of the switchboard. For NEMA 3R
> switchboard, mount within the weather doors.

3.03 [CLEANING]{.underline}

> 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.

3.04 [INSPECTION AND TESTING]{.underline}

> Sandia National Laboratories, or an independent party hired by Sandia
> National Laboratories may conduct a complete inspection and test of
> the switchboard to ensure the equipment and installation conforms to
> this specification. Contractor will correct all deficiencies found and
> a re‑test will be performed to verify corrections are acceptable.
> Testing will be in accordance with NETA ATS. A copy of this test check
> list is attached as Appendix B.
>
> **APPENDIX A**
>
> **APPENDIX B**