Download Section [26 24 13] [16441]

Square D by Schneider Electric
600 Volts and Less
Service and Distribution Switchboards
THIS GUIDE SPECIFICATION IS WRITTEN IN ACCORDANCE WITH THE CONSTRUCTION SPECIFICATIONS INSTITUTE (CSI)
MASTERFORMAT. THIS SECTION MUST BE CAREFULLY REVIEWED AND EDITED BY THE ARCHITECT OR THE ENGINEER
TO MEET THE REQUIREMENTS OF THE PROJECT. COORDINATE THIS SECTION WITH OTHER SPECIFICATION SECTIONS
IN THE PROJECT MANUAL AND WITH THE DRAWINGS.
WHERE REFERENCE IS MADE THROUGHOUT THIS SECTION TO “PROVIDE”, “INSTALL”, “SUBMIT”, ETC., IT SHALL MEAN
THAT THE CONTRACTOR, SUBCONTRACTOR, OR CONTRACTOR OF LOWER TIER SHALL “PROVIDE”, “INSTALL”, “SUBMIT”,
ETC., UNLESS OTHERWISE INDICATED.
THIS SECTION IS WRITTEN TO INCLUDE THE 2004 MASTERFORMAT AND THE 1995 MASTERFORMAT VERSIONS. WHERE
APPLICABLE, THESE ITEMS ARE BRACKETED AND, IN EACH CASE, UNLESS OTHERWISE INDICATED, THE FIRST CHOICE
APPLIES TO THE 2004 MASTERFORMAT AND THE SECOND CHOICE APPLIES TO THE 1995 MASTERFORMAT.
SECTION [26 24 13.40] [16441]
SWITCHBOARDS
PART 1 - GENERAL
1.1
A.
1.2
RELATED DOCUMENTS
Drawings and general provisions of the Contract, including General Conditions,
[Division 01 - GENERAL REQUIREMENTS] [Division 1 - GENERAL REQUIREMENTS], and other
applicable specification sections in the Project Manual apply to the work specified in this Section.
SUMMARY
A.
Scope: Provide design and engineering, labor, material, equipment, related services, and
supervision required, including, but not limited to, manufacturing, fabrication, erection, and
installation for switchboards as required for the complete performance of the work, and as shown on
the Drawings and as herein specified.
B.
Section Includes: The work specified in this Section includes, but shall not be limited to, service
and distribution switchboards rated 600 volts and less.
1.3
REFERENCES
A.
General: The publications listed below form a part of this Specification to the extent referenced. The
publications are referred to in the text by the basic designation only. The edition/revision of the
referenced publications shall be the latest date as of the date of the Contract Documents, unless
otherwise specified.
B.
ASTM (ASTM):
1. ASTM E 329, "Standard Specification for Agencies Engaged in the Testing and/or Inspection of
Materials Used in Construction."
C.
Federal Specifications (FS):
1. FS W-C-375, "Circuit Breakers, Molded Case, Branch Circuit and Service."
D.
Institute of Electrical and Electronics Engineers, Inc. (IEEE):
1. ANSI/IEEE C57.13, "Standard Requirements for Instrument Transformers" (copyrighted by
IEEE, ANSI approved).
Section [26 24 13] [16441]
Switchboards
03/08/11 - 1
E.
InterNational Electrical Testing Association (NETA):
1. NETA ATS, "Acceptance Testing Specifications for Electrical Power Distribution Equipment and
Systems."
F.
International Organization for Standardization (ISO):
1. ISO 9001, "Quality Management Systems - Requirements."
G.
Military Standardization Documents (MIL):
1. MIL-STD-220, "Method of Insertion Loss Measurement."
H.
National Electrical Contractors Association (NECA):
1. NECA 400, “Standard for Installing and Maintaining Switchboards" (copyrighted by NECA, ANSI
approved).
I.
National Electrical Manufacturers Association (NEMA):
1. NEMA EI 21.1, "Instrument Transformers for Revenue Metering (110 kV BIL and Less).”
2. NEMA KS 1, "Enclosed and Miscellaneous Distribution Equipment Switches (600 Volts
Maximum)" (copyrighted by NEMA, ANSI approved).
3. NEMA PB 2, "Deadfront Distribution Switchboards."
4. NEMA PB 2.1, "General Instructions for Proper Handling, Installation, Operation and
Maintenance of Deadfront Distribution Switchboards Rated 600 Volts or Less."
J.
National Fire Protection Association (NFPA):
1. NFPA 70, "National Electrical Code" (copyrighted by NFPA, ANSI approved) - hereinafter
referred to as NEC.
2. NFPA 70B, “Electrical Equipment Maintenance.”
3. NFPA 70E, “Standard for Electrical Safety in the Workplace.”
K.
Underwriters Laboratories, Inc. (UL):
1. UL 98, "Standard for Enclosed and Dead-Front Switches" (copyrighted by UL, ANSI approved).
2. UL 489, "Standard for Molded-Case Circuit Breakers and Circuit Breaker Enclosures."
3. UL 891, "Standard for Dead-Front Switchboards" (copyrighted by UL, ANSI approved).
4. UL 943, "Standard for Ground-Fault Circuit Interrupters" (copyrighted by UL, ANSI approved).
5. UL 1283, “Standard for Safety for Electro-Magnetic Interference Filters" (copyrighted by UL,
ANSI approved).
6. UL 1449, "Standard for Surge Protective Devices."
1.4
SUBMITTALS
A.
General: See [Section 01 33 00 - SUBMITTAL PROCEDURES] [Section 01300 - SUBMITTALS].
B.
Product Data: Submit product data showing material proposed. Submit sufficient information to
determine compliance with the Drawings and Specifications. Submit product data for each type of
switchboard, overcurrent protective device, surge protective device device, ground-fault protector,
accessory, and component indicated. Include dimensions and manufacturer’s technical data on
features, performance, electrical characteristics, ratings, and finishes.
C.
Shop Drawings: Submit shop drawings for each product and accessory required. Include
information not fully detailed in manufacturer’s standard product data. Submit shop drawings for
each switchboard and related equipment.
1. Indicate front and side enclosure elevations with overall dimensions, conduit entrance locations
and requirements, nameplate legends, one-line diagrams, equipment schedule and
switchboard instrument details.
RETAIN BELOW IF REQUIRED FOR THE PROJECT.
2.
Submit mimic-bus diagram.
Section [26 24 13] [16441]
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D.
Wiring Diagrams: Submit wiring diagrams detailing power, signal, and control systems, clearly
differentiating between manufacturer-installed wiring and field-installed wiring, and between
components provided by the manufacturer and those provided by others.
E.
Quality Control Submittals:
1. Test Reports: Submit field quality control test reports.
F.
Contract Closeout Submittals:
1. Operation and Maintenance Data: Submit operation and maintenance data for switchboards
to include in operation and maintenance manuals specified in [Division 01 - GENERAL
REQUIREMENTS] [Division 1 - GENERAL REQUIREMENTS].
2. Warranty Data: Submit manufacturer's standard warranty documents.
1.5
QUALITY ASSURANCE
A.
Qualifications:
1. Manufacturer Qualifications: Manufacturer shall be a firm engaged in the manufacture of
switchboards of types and sizes required, and whose products have been in satisfactory use in
similar service for a minimum of 20 years.
a. The manufacturer shall be ISO 9001 certified and shall be designed to internationally
accepted standards.
2. Installer Qualifications: Installer shall be a firm that shall have a minimum of five years of
successful installation experience with projects utilizing switchboards similar in type and scope
to that required for this Project.
3. Inspecting and Testing Agency Qualifications: To qualify for acceptance, an independent
inspecting and testing agency hired by the Contractor or manufacturer to test products shall
demonstrate to the Architect/Engineer’s satisfaction that they are qualified according to
ASTM E 329 to conduct testing indicated.
B.
Regulatory Requirements: Comply with applicable requirements of the laws, codes, ordinances,
and regulations of Federal, State, and local authorities having jurisdiction. Obtain necessary
approvals from such authorities.
C.
Standards: Comply with applicable requirements of the following standards:
1. NEMA PB 2.
2. NEC.
3. NFPA 70B.
4. NFPA 70E.
5. UL 98.
6. UL 489.
7. UL 943.
8. FS W-C-375.
D.
Electrical Components, Devices, and Accessories: Electrical components, devices, and
accessories shall be listed and labeled as defined in NEC, Article 100, by an inspecting and testing
agency acceptable to authorities having jurisdiction, and marked for intended use.
E.
Pre-Installation Conference: Conduct pre-installation conference in accordance with
[Section 01 31 19 - PROJECT MEETINGS] [Section 01200 - PROJECT MEETINGS]. Prior to
commencing the installation, meet at the Project site to review the material selections, installation
procedures, and coordination with other trades. Pre-installation conference shall include, but shall
not be limited to, the Contractor, the Installer, and any trade that requires coordination with the work.
Date and time of the pre-installation conference shall be acceptable to the Owner and the
Architect/Engineer.
1.6
DELIVERY, STORAGE, AND HANDLING
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A.
Deliver materials to the Project site in supplier’s or manufacturer’s original wrappings and containers,
labeled with supplier’s or manufacturer’s name, material or product brand name, and lot number, if
any.
B.
Store materials in their original, undamaged packages and containers, inside a well-ventilated area
protected from weather, moisture, soiling, extreme temperatures, and humidity.
1.7
A.
1.8
PROJECT CONDITIONS
Environmental Requirements: Do not install switchboards until space is enclosed and
weatherproof, wet work in space is completed and nominally dry, work above ceilings is complete,
and ambient temperature and humidity conditions are and will be continuously maintained at values
near those indicated for final occupancy.
WARRANTY
A.
General: See [Section 01 77 00 - CLOSEOUT PROCEDURES] [Section 01770 - CLOSEOUT
PROCEDURES].
B.
Special Warranty: The Contractor shall warrant the work of this Section to be in accordance with
the Contract Documents and free from faults and defects in materials and workmanship for period
indicated below. This special warranty shall extend the one year period of limitations contained in
the General Conditions. The special warranty shall be countersigned by the Installer and the
manufacturer.
1. Surge Protective Devices: Warranty shall be provided by the electrical distribution equipment
manufacturer and supported by their respective field services organization, for a period of five
years, incorporating unlimited replacement of suppressor parts.
C.
Additional Owner Rights: The warranty shall not deprive the Owner of other rights the Owner may
have under other provisions of the Contract Documents and shall be in addition to and run
concurrent with other warranties made by the Contractor under requirements of the Contract
Documents.
PART 2 - PRODUCTS
2.1
A.
2.2
A.
MANUFACTURERS
Basis of Design: Products specified shall be manufactured by Square D by Schneider Electric.
Items specified are to establish a standard of quality for design, function, materials, and appearance.
Equivalent products by other manufacturers are acceptable. The Architect/Engineer will be the sole
judge of the basis of what is equivalent.
MANUFACTURED UNITS
[Front Accessible] [Front and Side Accessible] [Front and Rear Accessible] Switchboard:
Provide [panel-mounted] [fixed, individually mounted] [drawout mounted] main device, [fixed
individually mounted branches,] panel-mounted plug-on branches 1200 amperes and less, and
sections front and rear aligned.
SELECT ACCESSIBILITY AND MOUNTING ABOVE. IN PARAGRAPH ABOVE, RETAIN “FIXED INDIVIDUALLY MOUNTED
BRANCHES” IF APPLICABLE TO THE PROJECT. SELECT SYSTEM VOLTAGE BELOW OR INSERT APPLICABLE
VOLTAGE.
B.
Nominal System Voltage: Nominal system voltage shall be [480Y/277 volts] [208Y/120 volts]
[__________].
Section [26 24 13] [16441]
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SELECT AMPERE RATING BELOW OR INSERT APPLICABLE AMPERE RATING.
C.
Main Bus Continuous: Provide [4000 ampere] [3000 ampere] [2500 ampere] [2000 ampere]
[1600 ampere] [1200 ampere] [__________] rating.
D.
Short Circuit Current Rating: [10 kA] [14 kA] [18 kA] [22 kA] [25 kA] [30 kA] [35 kA] [42 kA] [50 kA]
[65 kA] [85 kA] [100 kA] [125 kA] [130 kA] [150 kA] [200 kA]
SELECT SHORT CIRCUIT CURRANT RATING ABOVE. SELECT ENCLOSURE TYPE BELOW.
E.
Enclosure: Provide steel enclosure, in compliance with UL 891, [Type 1] [Type 1 with drip hood]
[Type 3R].
F.
Enclosure Finish: Provide factory-applied finish in manufacturer's standard gray finish over a
rust-inhibiting primer on treated metal surface.
G.
Barriers: Provide barriers between adjacent switchboard sections.
H.
Insulation and isolation: Provide taped bus for through bus.
RETAIN ABOVE WHEN INSULATED/ISOLATED BUS IS REQUIRED. RETAIN BELOW WHEN STRIP HEATERS ARE
REQUIRED.
I.
Strip Heaters: Provide factory-installed electric strip heaters of sufficient wattage in each vertical
section to maintain enclosure temperature above expected dew point.
1. Strip Heater Control: Provide [thermostats to maintain temperature of each section above
expected dew point] [humidistat to control humidity of each section].
SELECT CONTROL ABOVE AND POWER SOURCE BELOW.
2.
Strip Heater Power Source: Provide [transformer, factory-installed in switchboard] [120 volt
external branch circuit].
RETAIN BELOW WHEN AUXILIARY SECTION IS REQUIRED. SELECT BUSSED OR UNBUSSED SECTION.
J.
[Bussed] [Unbussed] Auxiliary Section: Auxiliary section shall be matched and aligned with basic
switchboard.
K.
Utility Metering Compartment: Provide fabricated compartment and section complying with utility
company's requirements. If separate vertical section is required for utility metering, match and align
with basic switchboard.
L.
Bus Transition and Incoming Pull Sections: Match and align with basic switchboard.
M.
Front Covers: Front covers shall be screw removable with a single tool and doors shall be hinged
with removable hinge pins.
N.
Pull Box on Top of Switchboard:
1. Provide adequate ventilation to maintain temperature in pull box within same limits as
switchboard.
RETAIN SUBPARAGRAPH BELOW FOR TOP-MOUNTED, CIRCUIT BREAKER REMOVAL MECHANISM.
2.
3.
Set back from front to clear circuit breaker removal mechanism.
Removable covers shall form top, front, and sides. Top covers at rear shall be easily
removable for drilling and cutting.
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RETAIN SUBPARAGRAPH BELOW IF APPLICABLE TO THE PROJECT.
4.
5.
Bottom shall be insulating, fire-resistive material with separate holes for cable drops into
switchboard.
Lace cables using industry-approved methods.
SELECT MATERIAL BELOW.
O.
Buses and Connections: Three phase, four wire, unless otherwise indicated. Provide [hard-drawn
plated copper of 98 percent conductivity] [tin-plated, high strength, electrical grade aluminum alloy].
1. Group-Mounted Feeder Vertical Bus Stack:
a. Bus stack shall be capable of mounting feeder breakers with different frame sizes and
number of poles across from one another on the bus stack.
b. Non-conducting surface films shall be removed during circuit breaker installation by a
wiping action of the circuit breaker jaws.
c. The design of the circuit breaker jaws and bus stack shall create blow-on forces under fault
conditions.
d. Bolted lap joint connections for feeder breakers shall not be allowed for group-mounted
feeders.
2. Ground Bus: Size per current NEC and UL 891 Tables 28.1 and 28.2, hard-drawn copper of
98 percent conductivity, equipped with pressure connectors 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.
3. Bus Composition: Plated [copper] [aluminum]. Plating shall be applied continuously to bus
work. The switchboard bussing shall be of sufficient cross-sectional area to meet UL 891
temperature rise requirements. The phase [and neutral] through-bus shall have an ampacity as
shown on the Drawings. For four-wire systems, the neutral shall be of equivalent ampacity as
the phase bus bar. Tapered bus is not permitted. Full provisions for the addition of future
sections shall be provided. Bussing shall include, but shall not be limited to, necessary
hardware to accommodate splicing for future additions.
SELECT MATERIAL ABOVE. IN SUBPARAGRAPH ABOVE, RETAIN “AND NEUTRAL” IF APPLICABLE. RETAIN BELOW IF
OPTIONAL BARRIERS ARE NOT SPECIFIED.
4.
P.
2.3
A.
Isolation Barrier Access Provisions: Permit checking of bus bolt tightness.
Future Devices: Equip compartments with mounting brackets, supports, bus connections, and
appurtenances at full rating of circuit breaker compartment.
SURGE PROTECTIVE DEVICES (SPD’s)
See [Section 26 28 19 - SURGE PROTECTIVE DEVICES] [Section 16476 – SURGE PROTECTIVE
DEVICES].
SELECT SURGE PROTECTIVE DEVICES ARTICLE ABOVE OR SURGE PROTECTIVE DEVICES ARTICLE BELOW.
RETAIN ABOVE OR BELOW, NEVER BOTH. RETAIN ABOVE IF WORK IS TO BE SPECIFIED IN ANOTHER SECTION,
RETAIN BELOW IF WORK IS TO BE SPECIFIED IN THIS SECTION.
2.4
SURGE PROTECTIVE DEVICES (SPD’s)
A.
Surge protective devices shall be listed and components shall be recognized in accordance with
UL 1449 to include Section 37.3 highest fault current category. Surge protective devices shall be
UL 1283 listed.
B.
Surge protective devices shall be installed by, and shipped from, the electrical distribution equipment
manufacturer’s factory.
Section [26 24 13] [16441]
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C.
Provide surge current diversion paths for all modes of protection; L-N, L-G and N-G in WYE
systems.
D.
Surge protective devices shall be modular in design. Each mode, including N-G, shall be fused with
a 200 kA IR UL-classified surge-rated fuse and incorporating a thermal cutout device.
E.
Audible diagnostic monitoring shall be by way of audible alarm. Alarm shall activate upon a fault
condition. Provide an alarm on/off switch to silence alarm. Provide an alarm push-to-test switch.
F.
If a dedicated breaker for the surge protective device is not provided, the surge protective device
shall include an UL-recognized disconnect switch.
G.
Meet or exceed the following criteria:
1. Minimum surge current capability (single pulse rated) per phase shall be [240 kA] [200 kA],
[160 kA] [120 kA] [100 kA].
SELECT SURGE CURRENT CAPABILITY ABOVE AND SUPPRESSION VOLTAGE RATING BELOW.
2.
UL 1449 suppression voltage rating, voltage L-N, L-G, N-G, shall be [208Y/120 volts; 400 volts]
[480Y/277 volts; 600 volts].
H.
EMI/RFI filtering shall be minimum -50 dB at 100 kHz with insertion ratio of 50:1 using MIL-STD-220
methodology.
I.
Provide with one set of NO/NC dry contacts.
J.
Accessories shall include but shall not be limited to, six-digit transient counter set to total transient
surges that deviate from the sine wave envelope by more than 125 volts.
2.5
A.
OVERCURRENT PROTECTIVE DEVICES
See [Section 26 28 23 - OVERCURRENT PROTECTIVE DEVICES]
[Section 16477 - OVERCURRENT PROTECTIVE DEVICES].
SELECT OVERCURRENT PROTECTIVE DEVICES ARTICLE ABOVE OR OVERCURRENT PROTECTIVE DEVICES
ARTICLE BELOW. RETAIN ABOVE OR BELOW, NEVER BOTH. RETAIN ABOVE IF WORK IS TO BE SPECIFIED IN
ANOTHER SECTION, RETAIN BELOW IF WORK IS TO BE SPECIFIED IN THIS SECTION.
2.6
A.
OVERCURRENT PROTECTIVE DEVICES
Breaker Type:
1. Thermal magnetic/basic electronic circuit breakers.
2. Electronic trip, standard and advanced.
3. Current-limiting circuit breakers.
SELECT TRIP SENSITIVITY BELOW.
4.
B.
GFCI circuit breakers (single-pole and two-pole configurations with [5 mA] [30 mA] trip
sensitivity).
Molded Case Circuit Breaker Features and Accessories: Standard frame sizes, trip ratings, and
number of poles.
SELECT STYLE BELOW.
1.
Lugs: [Mechanical] [Compression] style, suitable for number, size, trip ratings, and conductor
material.
Section [26 24 13] [16441]
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2.
3.
4.
5.
Application Listing: Appropriate for application; Type SWD for switching fluorescent lighting
loads; Type HACR for heating, air-conditioning, and refrigerating equipment.
Ground Fault Protection: Integral to circuit breaker with adjustable pickup and time delay
settings, push-to-test feature, and ground fault indicator.
Communication Capability: Web-enabled power distribution equipment with integral Ethernet
port and embedded web server with factory-configured web pages (HTML file format) for
viewing of power monitoring and equipment status information from connected devices with
communications compatible with power monitoring and control system, specified in
[Section 26 09 13 - ELECTRICAL POWER MONITORING AND CONTROL]
[Section 16295 - ELECTRICAL POWER MONITORING AND CONTROL].
Shunt Trip: 120 volt trip coil energized from separate circuit, set to trip at [55 percent]
[75 percent] of rated voltage.
SELECT PERCENTAGE ABOVE AND TIME DELAY BELOW.
6.
Undervoltage Trip: Set to operate at 35 to 75 percent of rated voltage [without intentional]
[with field-adjustable 0.1 second to 0.6 second] time delay.
SELECT NUMBER OF SWITCHES BELOW.
7.
8.
9.
C.
Auxiliary Contacts: [One SPDT switch] [Two SPDT switches] with "a" and "b" contacts; "a"
contacts shall mimic circuit breaker contacts, "b" contacts shall operate in reverse of circuit
breaker contacts.
Key Interlock Kit: Externally mounted to prohibit circuit breaker operation; key shall be
removable only when circuit breaker is in off position.
Zone Selective Interlocking: Integral with electronic trip unit; for interlocking ground fault
protection function.
Enclosed, Insulated Case Circuit Breaker: Fully rated, encased power circuit breaker with
interrupting capacity rating to meet available fault current.
SELECT MOUNTING BELOW.
1.
2.
3.
4.
5.
6.
7.
Mounting: [Fixed] [Drawout] circuit breaker mounting.
Closing: Two-step, stored energy closing.
Trip Units: Microprocessor-based trip units with interchangeable rating plug, LED trip
indicators, and the following field-adjustable settings:
a. Instantaneous trip.
b. Long-time and short-time pickup levels.
c. Long-time and short-time time adjustments with I2t response.
d. Ground fault pickup level, time delay, and I2t response.
Remote: Remote trip indication and control.
Communication Capability: Web-enabled power distribution equipment with integral Ethernet
port and embedded web server with factory-configured web pages (HTML file format) for
viewing of power monitoring and equipment status information from connected devices with
communications compatible with power monitoring and control system specified in
[Section 26 09 13 - ELECTRICAL POWER MONITORING AND CONTROL]
[Section 16295 - ELECTRICAL POWER MONITORING AND CONTROL].
Key Interlock Kit: Externally mounted to prohibit circuit breaker operation; key shall be
removable only when circuit breaker is in off position.
Zone Selective Interlocking: Integral with electronic trip unit; for interlocking ground fault
protection function.
SELECT VOLTAGE BELOW OR INSERT APPLICABLE VOLTAGE. SELECT DC OR AC BELOW.
8.
Control Voltage: [40 volts] [125 volts] [250 volts] [__________], [dc] [ac].
Section [26 24 13] [16441]
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D.
Bolted Pressure Contact Switch: Operating mechanism shall use rotary mechanical bolting action
to produce and maintain high clamping pressure on the switch blade after it engages the stationary
contacts.
E.
Fused Switch: NEMA KS 1, Type HD; shall clip to accommodate specified fuses; lockable handle.
F.
Fuses: Fuses are specified in [Section 26 28 13 - FUSES] [Section 16477 - FUSES].
2.7
A.
INSTRUMENTATION
Instrument Transformers: NEMA EI 21.1, ANSI/IEEE C57.13, and the following:
1. Potential Transformers: Secondary voltage rating of 120 volts and NEMA accuracy class of
0.3 with burdens of W, X, and Y.
COORDINATE SUBPARAGRAPH BELOW WITH THE DRAWINGS AND INDICATE SPECIFIC ACCURACY CLAUSES AND
BURDENS REQUIRED FOR EACH APPLICATION.
2.
3.
Current Transformers: Ratios shall be as indicated with accuracy class and burden suitable
for connected relays, meters, and instruments.
Control Power Transformers: Dry type, mounted in separate compartments for units larger
than 3 kV.
RETAIN BELOW FOR CERTAIN GROUND FAULT PROTECTION SITUATIONS SUCH AS DOUBLE-ENDED
SWITCHBOARDS ON FOUR-WIRE, GROUNDED NEUTRAL SYSTEMS. COORDINATE WITH THE DRAWINGS.
4.
B.
Current Transformers for Neutral and Ground Fault Current Sensing: Connect
secondaries to ground overcurrent relays to provide selective tripping of main and tie circuit
breaker. Coordinate with feeder circuit breaker ground fault protection.
Electricity Metering: See [Section 26 27 13 - ELECTRICITY METERING]
[Section 16430 - ELECTRICITY METERING].
SELECT METERING PARAGRAPH ABOVE OR METERING PARAGRAPH. RETAIN ABOVE OR BELOW, NEVER BOTH.
RETAIN ABOVE IF WORK IS TO BE SPECIFIED IN ANOTHER SECTION, RETAIN BELOW IF WORK IS TO BE SPECIFIED
IN THIS SECTION.
C.
Multifunction Digital Metering Monitor: Microprocessor-based unit suitable for three-wire or
four-wire systems and with the following features:
1. Digital Display: Switch-selectable digital display of the following values with maximum
accuracy tolerances as indicated:
a. Phase Currents, Each Phase: ±1 percent.
b. Phase-to-Phase Voltages, Three-Phase: ±1 percent.
c. Phase-to-Neutral Voltages, Three-Phase: ±1 percent.
d. Megawatts: ±2 percent.
e. Megavars: ±2 percent.
f. Power Factor: ±2 percent.
g. Frequency: ±0.5 percent.
h. Megawatt Demand: ±2 percent; demand interval programmable from 5 to 60 minutes.
i. Accumulated Energy, Megawatt Hours: ±2 percent. Accumulated values unaffected by
power outages up to 72 hours.
j. Watt-Hour Meters: Flush or semiflush type, rated 5 amperes, 120 volts, three-phase,
three-wire, with three elements, 15 minute-indicating-demand register, and provision for
testing and adding pulse initiation.
k. Recording Demand Meter: Usable as totalizing relay or as indicating and recording
maximum demand meter with 15 minute interval. Meter shall count and control a
succession of pulses entering two channels.
2. Mounting: Display and control unit flush or semiflush mounted in instrument compartment or
main device door.
Section [26 24 13] [16441]
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2.8
A.
CONTROL POWER
Control Circuits: 120 volts, supplied through secondary disconnecting devices from control power
transformer.
RETAIN BELOW IF REQUIRED.
B.
Electrically Interlocked Main and Tie Circuit Breakers: Two control power transformers, with
interlocking relays, connected to the primary side of each control power transformer at the line side
of the associated main circuit breaker. Provide 120 volt secondaries connected through automatic
transfer relays to ensure a fail-safe automatic transfer scheme.
C.
Control Power Fuses: Primary and secondary fuses for current-limiting and overload protection of
transformer and fuses for protection of control circuits.
D.
Control Wiring: Factory-installed, with bundling, lacing, and protection included. Provide flexible
conductors for No. 8 AWG and smaller, for conductors across hinges, and for conductors for
interconnections between shipping units.
2.9
ACCESSORY COMPONENTS AND FEATURES
A.
Provide accessory set, including, but not limited to, tools and miscellaneous items required for
overcurrent protective device test, inspection, maintenance, and operation.
B.
Provide one remote racking device for drawout circuit breakers.
RETAIN ABOVE FOR DRAWOUT CIRCUIT BREAKERS. RETAIN BELOW FOR CIRCUIT BREAKERS WITH SOLID STATE
TRIP DEVICES.
C.
Provide portable test set to test 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.
D.
Provide one portable, floor-supported, roller-based, elevating carriage arranged for movement of
circuit breakers in and out of compartments for present and future circuit breakers.
RETAIN ABOVE AND/OR BELOW FOR INSTALLATIONS WITH DRAWOUT CIRCUIT BREAKERS.
E.
Provide overhead circuit breaker lifting device, mounted at top front of switchboard, with hoist and
lifting yokes matching each drawout circuit breaker.
F.
Provide spare fuse cabinet, suitably identified, wall-mounted, lockable, compartmented steel box or
cabinet. Arrange for wall mounting.
2.10
A.
IDENTIFICATION
Mimic Bus: Provide an anodized aluminum or plastic engraved plaque. Arrange in single-line
diagram format, using symbols and letter designations consistent with final mimic bus diagram.
Produce a concise visual presentation of principal switchboard components and connections.
PART 3 - EXECUTION
3.1
A.
EXAMINATION
Verification of Conditions: Examine areas and conditions under which the work is to be installed,
and notify the Contractor in writing, with a copy to the Owner and the Architect/Engineer, of any
Section [26 24 13] [16441]
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conditions detrimental to the proper and timely completion of the work. Do not proceed with the work
until unsatisfactory conditions have been corrected.
1. Beginning of the work shall indicate acceptance of the areas and conditions as satisfactory by
the Installer.
3.2
A.
INSTALLATION
General: Preparation and installation shall be in accordance with reviewed product data, final shop
drawings, manufacturer’s written recommendations, and as indicated on the Drawings.
1. Install switchboards and accessories according to NEMA PB 2.1 and NECA 400.
2. Install and anchor switchboards level on concrete bases, 4 inch (102 mm) nominal thickness.
Concrete base is specified in [Section 26 05 00 - COMMON WORK RESULTS FOR
ELECTRICAL] [Section 16050 - BASIC ELECTRICAL MATERIALS AND METHODS], and
concrete materials and installation requirements are specified in [Division 03 - CONCRETE]
[Division 3 - CONCRETE].
3. Remove temporary lifting eyes, channels, and brackets and temporary blocking of moving parts
from switchboard units and components.
4. Frame and mount the printed basic operating instructions for switchboards, including, but not
limited to, control and key interlocking sequences and emergency procedures. Fabricate frame
of finished wood or metal and cover instructions with clear acrylic plastic. Mount on front of
switchboards.
5. Install overcurrent protective devices, surge protective devices, and instrumentation.
a. Set field-adjustable switches and circuit breaker trip ranges.
RETAIN BELOW IF SPARE FUSE CABINETS ARE SPECIFIED IN PART 2 - PRODUCTS.
6.
B.
3.3
Install spare fuse cabinet.
Identification:
1. Identify field-installed conductors, interconnecting wiring, and components; provide warning
signs as specified in [Section 26 05 00 - COMMON WORK RESULTS FOR ELECTRICAL]
[Section 16050 - BASIC ELECTRICAL MATERIALS AND METHODS].
2. Label each switchboard compartment with engraved metal or laminated plastic nameplate
mounted with corrosion-resistant screws.
FIELD QUALITY CONTROL
A.
See [Section 01 45 23 - INSPECTING AND TESTING SERVICES] [Section 01410 - INSPECTING
AND TESTING SERVICES].
B.
Prepare for acceptance tests as follows:
1. Test insulation resistance for each switchboard bus, component, connecting supply, feeder,
and control circuit.
2. Test continuity of each circuit.
C.
Perform the following field tests and inspections and prepare test reports:
1. Perform each electrical test and visual and mechanical inspection stated in NETA ATS,
Sections 7.1, 7.5, 7.6, 7.9, 7.10, 7.11, and 7.14 as appropriate. Certify compliance with test
parameters.
2. Correct malfunctioning units on-site, where possible, and retest to demonstrate compliance;
otherwise, replace with new units and retest.
3.4
A.
PROTECTION
Provide final protection and maintain conditions in a manner acceptable to the Installer, that shall
ensure that the switchboards shall be without damage at time of Substantial Completion.
Section [26 24 13] [16441]
Switchboards
03/08/11 - 11
END OF SECTION
Section [26 24 13] [16441]
Switchboards
03/08/11 - 12