26 24 13-SwitchboardsLowVoltageFeeders-20200505.pdf

USDA Forest Service Project Specifications

5/5/2021 Multnomah Falls Electrical Upgrade & Emergency Generators Pg. 1/9 Switchboards Low Voltage Feeders 26 24 13

SECTION 26 24 13

SWITCHBOARDS, LOW VOLTAGE FEEDERS, COMMERCIAL GRADE

1. PART 1 - GENERAL

1.01 SCOPE

A. The Contractor shall furnish and install, where indicated, a free-standing, dead-front type low voltage distribution switchboard, utilizing group mounted circuit protective devices as specified herein, and as shown on the contract drawings.

B. This specification applies to panel SWB1 only C. All power panels in this project shall be by one manufacturer.

D. This panel is connected to main transfer switch ATS-1. Contractor shall integrate panel

SWB1 and ATS-1 in submittals and conduit layout as described below.

E. Contractor shall have the proposed panel manufacturer perform short circuit and arc-flash studies per specification 26 05 74-Short Circuit-Arc Flash Analysis to verify final AIC and arc-flash ratings and labels for panels to be submitted before submitting panels for approval.

1. Contractor shall use Government supplied Easy Power short circuit analysis model

.DEZ file for this analysis.

2. Contract drawings shall be updated after final short circuit fault calculations and arc-flash calculation have been performed using proposed panels and equipment.

3. Contractor shall supply both Short Circuit and Arc Flash labels as required by 26 05

74. NEC 70 and NEC 70E latest version.

1.02 REFERENCES

A. The low voltage distribution switchboards and all components shall be designed, manufactured, and tested in accordance with the latest applicable following standards:

1. NEMA PB-2

2. UL Standard 891

3. UL standard 1066

4. UL standard 489

5. UL Standard 1449

B. Division 1 Submitatls C. 26 05 74 Short Circuit and Arc Flash Analysis D. 26 43 13 Surge Protective Device.

E. 26 36 23A ATS-Service Rated

1.03 SUBMITTALS – FOR REVIEW/APPROVAL

A. Submit per 01 33 00 and 26 00 00 B. Eaton brand Pow-R-Line C switchboard product line was used as the basis of these requirements. If alternate products are to be used, demonstration of equivalency must be provided in writing.

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C. Switchboard shall be designed to integrate with an Automatic transfer switch ATS-1 with interconnections cables and conduits shown in submittals.

1. Provide an integrated submittal with SWB1 and ATS showing dimensions and locations for all interconnections and interconnection conduits and service conduits.

D. The following information shall be submitted to the Contracting Officer (CO):

1. Component list

2. Manufacturer’s dimensioned shop drawings of enclosure with physical breaker placement and circuit numbers. Include ATS-1 combined layout.

3. Provide panel manufacturers project specific shop drawings with data sheet showing complete construction of enclosure, bus material size enclosure size and materials, classification and all other ratings.

a. Show all circuits pole spaces, breaker sizes and poles in physical layout

b. Provide cut sheet of all circuit breakers and other accessories.

4. Assembly ratings including:

a. Short-circuit rating of bus and breakers.

b. Voltage

c. Continuous current

d. Panel labels

5. Cable terminal sizes (coordinate cable terminations for incoming feeders and ATS-1 connections with One Line Diagram in drawing set)

6. Product data sheets on enclosure and all breakers and any electronic interfaces required for breaker programming and operation.

7. Show all circuits pole spaces, breaker sizes and poles in physical layout

8. Provide cut sheets of all circuit breakers and other accessories such as internal heater.

1.04 SUBMITTALS – FOR CONSTRUCTION

A. The following information shall be submitted for record purposes:

1. Final as-built drawings and information for items listed in Paragraph 1.03, and shall incorporate all changes made during the manufacturing and installation process

2. Installation information

1.05 QUALIFICATIONS

A. The manufacturer of the assembly shall be the manufacturer of the major components within the assembly.

B. For the equipment specified herein, the manufacturer shall be ISO 9001 or 9002 certified.

C. The manufacturer of this equipment shall have produced similar electrical equipment for a minimum period of five (5) years. Provide list of installations with similar equipment shall be provided demonstrating compliance with this requirement.

D. Vendor shall maintain a service organization within 300 miles of project site.

E. Provide seismic qualified equipment.

1.06 REGULATORY REQUIREMENTS

A. The low-voltage switchboard shall be UL rated.

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B. Panelboard overcurrent protective devices shall be selectively coordinated with all supply side overcurrent protective devices as required for this project by the National Electrical Code/NFPA 70 Articles 645.27, 700.27, 701.27 and 708.54.

C. Provide coordination with panels DP-1 & DP-2.

1.07 DELIVERY, STORAGE AND HANDLING

A. Equipment shall be handled and stored in accordance with manufacturer’s instructions. One

(1) copy of these instructions shall be included with the equipment at time of shipment.

1.08 OPERATION AND MAINTENANCE MANUALS

A. Equipment operation and maintenance manuals shall be provided with each assembly shipped and shall include instruction leaflets, instruction bulletins and renewal parts lists where applicable, for the complete assembly and each major component.

2. PART 2 - PRODUCTS

2.01 MANUFACTURERS

A. Eaton (Basis of Design) B. General Electric C. Siemens D. Schneider Electric Square D E. Allen Bradley F. The listing of specific manufacturers above does not imply acceptance of their products that do not meet the specified ratings, features and functions. Manufacturers listed above are not relieved from meeting these specifications in their entirety.

2.02 RATINGS

A. The assembly shall be rated to withstand mechanical forces exerted during short-circuit conditions when connected directly to a power source having available fault current of 100,000 amperes symmetrical at rated voltage or as shown on the contract documents.

1. AIC final values are to be calculated in requirements above and in specification 26 05

74-Short Circuit-Arc Flash Analysis, prior to submittals for panels for approval.

B. Panelboards shall be labeled with a UL short-circuit rating. Fully rated panels shall be supplied.

C. Bus voltage and current rating to be as indicated on the contract documents.

2.03 CONSTRUCTION

A. Switchboard shall consist of the required number of vertical sections bolted together to form a rigid assembly. The sides and rear shall be covered with removable bolt-on covers.

All edges of front covers or hinged front panels shall be formed. Provide adequate ventilation within the enclosure.

B. The switchboard shall be suitable for use as service entrance equipment and be labeled in accordance with UL requirements.

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C. All sections of the switchboard shall be front and rear aligned with depth as shown on the drawings. All protective devices shall be group mounted. Devices shall be front removable and load connections front accessible enabling switchboard to be mounted against a wall.

D. The assembly shall be provided with adequate lifting means.

E. Provide an internal thermostatically controlled space heater for SWB1 panel. Provide a dedicated breaker in panel for this unit.

2.04 BUS

A. All bus bars shall be silver-plated copper. Main horizontal bus bars shall be mounted with all poles arranged in the same vertical plane. Bus sizing shall be based on NEMA standard temperature rise criteria.

B. Provide a full capacity neutral bus where a neutral bus is indicated on the drawings.

C. A 1/4 x 2 inch copper ground bus (minimum) shall be furnished firmly secured to each vertical section structure and shall extend the entire length of the switchboard.

D. All hardware used on conductors shall be high-tensile strength and zinc-plated. All bus joints shall be provided with conical spring-type washers.

2.05 PANEL DOORS AND LOCKS

A. Provide hinged swing out panel doors that will allow opening to interior without removal of entire door. Switchboard shall be dead front with no operable devices. Outer door must be opened to access breakers.

B. Provide locks and a common key for all panels. Provide 3 keys for each panel.

C. Provide a padlock hasp in addition to keyed door lock.

2.06 WIRING/TERMINATIONS

A. Verify wiring connections needed to connect to Automatic Transfer switch ATS-1 for bus and connection locations.

B. Small wiring, necessary fuse blocks and terminal blocks within the switchboard shall be furnished as required. Control components mounted within the assembly, such as fuse blocks, relays, pushbuttons, switches, etc., shall be suitably marked for identification corresponding to appropriate designations on manufacturer’s wiring diagrams.

C. Mechanical-type terminals shall be provided for all line and load terminations suitable for copper or aluminum cable rated for 75 degrees C of the size as indicated on the drawings.

D. Lugs shall be provided in the incoming line section for connection of the main grounding conductor. Additional lugs for connection of other grounding conductors shall be provided as indicated on the drawings.

E. All control wire shall be type SIS, bundled and secured with nylon ties. Insulated locking spade terminals shall be provided for all control connections, except where saddle type terminals are provided integral to a device. All current transformer secondary leads shall first be connected to conveniently accessible short-circuit terminal blocks before connecting to any other device. All groups of control wires leaving the switchboard shall be provided with terminal blocks with suitable numbering strips. Provide wire markers at each end of all control wiring.

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2.07 MAIN AND TIE PROTECTIVE DEVICES

A. This section of switchgear shall be Main Lugs Only with the Main Breaker controlling this section residing in ATS-1.

2.08 FEEDER PROTECTIVE DEVICES

A. All feeder protective devices shall be Eaton or approved equal molded case circuit breakers with inverse time tripping characteristics.

B. Circuit breakers shall be operated by a toggle-type handle and shall have a quick-make, quick-break over-center switching mechanism that is mechanically trip-free. Automatic tripping of the breaker shall be clearly indicated by the handle position. Contacts shall be non-welding silver alloy and arc extinction shall be accomplished by means of DE-ION arc chutes. A push-to-trip button on the front of the circuit breaker shall provide a local manual means to exercise the trip mechanism.

C. Circuit breakers shall have a minimum symmetrical interrupting capacity as required by short circuit analysis. See 26 05 73 for short circuit calculation required to determine final AIC ratings.

D. All molded case circuit breakers shall be equipped with a true RMS sensing, solid-state tripping system consisting of at least three current sensors microprocessor-based trip device and trip actuator. The trip unit shall use microprocessor-based technology to provide the basic adjustable time-current protection.

E. Provide trip units with integral arc flash reduction mode for 1200A frame and above. The use of zone selective interlocking to emulate this feature does not meet the intent of these specifications and will not be allowed.

F. System coordination shall be provided by adjusting rotary switches for the following microprocessor-based time-current curve shaping adjustments:

1. Adjustable long-delay pick-up setting with minimum of 10 settings

2. Adjustable long-delay time - 0.5 to 20 seconds

3. Adjustable short-delay pick-up setting – 1.5x to Max allowable by frame

4. Adjustable short-delay time 0.0 sec up to 0.5 sec depending on frame with selectable flat or I2t curve shaping

5. Adjustable instantaneous setting 2x to Max allowable by frame

6. Where indicated, adjustable ground fault current pickup (0.2 – 1.0 x In in 0.10x increments) and time (0.1 – 1.0 sec in 0.10sec increments), with selectable flat or I2t curve shaping. Provide switch selectable options for GF OFF, GF alarm, or GF trip.

G. Provide 100% rated UL listed circuit breakers.

H. Trip units shall be capable of metering phase, neutral, and ground current with an accuracy of +/- 2.0% of the reading.

I. Trip units shall collect and store pertinent information to the trip unit and circuit breaker health and event history. The trip unit shall also include diagnostic features to allow the user to investigate events and dynamically monitor the health of the trip unit and the breaker.

1. Number of operations (load and no-load)

2. Number of trips (overload trips, short circuit trips)

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3. Run time

4. Breaker ambient temperature.

2.09 ACCESSORIES

A. Provide shunt trips, bell alarms and auxiliary switches as follows.

1. Summary breaker trip alarm w/ auxiliary contact for remote annunciator

2.10 MISCELLANEOUS DEVICES

A. Provide a key interlock with ATS-1 to prevent transferring of load to generator if generator is being connected.

B. For outdoor installations, each section of the switchboard shall be provided with a thermostatically controlled space heater.

1. For SWB1, Provide 20A breaker 1P for this heater.

2. Provide a similar circuit for ATS-1 space heater, fed from SWB1.

2.11 SURGE PROTECTIVE DEVICE

A. Provide surge protective devices as shown on contract drawings and per section 26 43 13 -

Surge Protective Device.

2.12 ENCLOSURES

A. Outdoor NEMA 3R SS stainless steel. Main Lodge SWB1 panel Only

1. Outdoor enclosure shall be non-walk-in and meet applicable UL requirements.

2. Enclosure shall have sloping roof downward toward rear

3. The enclosure shall be provided with bolt-on rear covers for each section

4. Doors shall have provisions for padlocking

5. Ventilating openings shall be provided.

6. Provide thermostatically controlled space heaters for each structure to prevent the accumulation of moisture.

7. Power for space heaters, lights and receptacles contained within SWB1 and ATS-1 shall be obtained from panel SWB1.

2.13 CUSTOMER METERING

A. Where indicated on the drawings, provide a separate customer metering compartment with a front facing hinged door and a UL listed microprocessor based multifunction power meter equal to Eaton PXM2280. Include current transformers wired to shorting-type terminal blocks for each meter. Provide fused potential taps as the potential source for metering as shown on the drawings.

B. The meter surge withstand shall conform to IEEE C37.90.1 and ANSI C62.41.

C. The meter shall accept a direct voltage input range of up to 576 Volts Line to Neutral, and a range of up to 721 Volts Line to Line.

D. The meter shall accept a current input of up to 10 amps continuous. Startup current for a

5A input shall be no greater than 0.005A.

E. Fault Current Withstand shall be 100 Amps for 10 seconds, 300 Amps for 3 seconds, and

500 Amps for 1 second.

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F. The meter shall have an accuracy of +/- 0.1% or better for volts and amps, and 0.2% for power and energy functions. The meter shall meet the accuracy requirements of ANSI C12.20 (Class 0.2%).

G. The meter shall provide true RMS measurements of voltage, phase to neutral and phase to phase; current, per phase and neutral.

H. The meter shall provide sampling at 400+ samples per cycle on all channels measured readings simultaneously.

I. Meter shall provide per phase % THD and individual harmonic monitoring to the 40th order for current and for voltage L-N. Metered values shall include Volts, Amps, kW, kVAR, PF, kVA, Frequency, kWh, kVAh and kVARh. Meter shall have 512MB (minimum) onboard memory for data logging.

J. The meter shall provide user configured fixed window or sliding window demand.

K. Meter shall provide a simultaneous voltage and current waveform recorder with programmable sampling rate.

L. The meter shall allow up to 1000 events (minimum) to be recorded.

M. The meter shall be able to be configured and viewed from the on-board web server without the need for external software N. The meter shall include a three-line, bright red, .50” (minimum) LED display.

O. The meter must display a % of Load Bar on the front panel to provide an analog feel. The

% Load Bar shall have not less than 10 segments.

P. The meter shall support Modbus RTU, Ethernet TCP/IP, Modbus TCP, or BACnet/IP communications

2.14 NAMEPLATES

A. Engraved nameplates, mounted on the face of the assembly, shall be furnished for all main and feeder circuits as indicated on the drawings. Nameplates shall be laminated plastic, black characters on white background. Characters shall be 3/16-inch high, minimum.

Nameplates shall give item designation and circuit number as well as frame ampere size and appropriate trip rating. Furnish master nameplate giving switchboard designation, voltage ampere rating, short-circuit rating, manufacturer’s name, general order number, and item number.

B. Provide an engraved nameplate for each panel section. Provide the following information

1. Panel name

2. Amperage, voltage and phase, wire

3. AIC value & arc-flash labels with data per NEC 70E requirements.

4. Date installed

5. Contractors name

C. Provide additional engraved nameplates for each breaker. Identify secondary panelboards by name shown on contract documents.

D. Control components mounted within the assembly, such as fuse blocks, relays, pushbuttons, switches, etc., shall be suitably marked for identification corresponding to appropriate designations on manufacturer’s wiring diagrams.

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2.15 FINISH & CLEANING

A. All exterior and interior steel surfaces of the switchboard shall be properly cleaned.

B. Panels are stainless steel; no painting is required.

C. Vacuum panel interiors of all debris at completion.

3. PART 3 - EXECUTION

3.01 FACTORY TESTING

A. The following standard factory tests shall be performed on the equipment provided under this section. All tests shall be in accordance with the latest version of NEMA and UL standards.

1. Seismic Qualification Certification

2. Manufacturer shall provide a statement that panel and internal components have been tested to meet the requirements 1.02A of this section.

3.02 FIELD TESTING

A. See section 26 04 00 for related field testing requirements. Specific tests are required prior to connection of conductors.

B. Provide manufactures field engineer to perform panel testing and calibration of all breakers and any metering.

C. Document all final settings of any adjustable equipment.

3.03 INSTALLATION

A. The Contractors shall install all equipment per the manufacturer’s recommendations and the contract drawings

B. Mount switchboard SWB1 and ATS-1 to wall with stainless steel slotted channel behind panel. Provide all stainless-steel mounting hardware

3.04 OPERATION AND MAINTENANCE MANUALS

A. Provide a detailed operation and maintenance manual for normal operational sequences including complete parts list, project specific operations instructions in a written document.

B. Provide as-built diagrams and all manufactures approved submittal and operation, calibration, and maintenance information for this switchboard.

C. Provide complete documentation on power monitor system and use for operator. Provide project specific instructions for this sub-system.

D. Document all settings for breakers on as-built drawings.

E. Document all calibration and programming procedures used.

F. Provide both electronic copies in PDF and DWG for shop drawings and provide 2 hard copies of final O&M manual for this switchboard.

G. Provide complete schematic and wiring diagrams of switchboard switch and all internal control components with wire numbers on all conductors matching schematic and wiring diagrams.

H. Provide complete electronic copies in PDF and hard copies of manuals.

I. Provide as-built wiring and schematic diagrams in hard copy and PDF format.

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END OF SECTION