16635 - power distribution units

The University of Iowa - Information Technology Facility

UIA No. 0564201 / EYP MCF No. 5K3-UIA03

Install Research Power Distribution Unit in Room 135

SECTION 26 26 00

POWER DISTRIBUTION UNITS - PREPURCHASE

Issue for Prepurchase 6/5/2015

PART 1 - GENERAL

1.1

A.

SUMMARY

These specifications describe requirements for a complete power conditioning and distribution system, supplying computer grade power to sensitive loads. The specified system shall provide isolation, distribution, control, and monitoring of AC power.

1.2

A.

B.

C.

D.

1.

2.

3.

STANDARDS

The specified system shall be designed, manufactured, tested, and installed in compliance with:

1.

2.

3.

4.

5.

6.

7.

8.

American National Standards Institute (ANSI)

Federal Information Processing Standards Publication 94 (FIPS Pub 94)

Institute of Electrical and Electronics Engineers (IEEE)

ISO 9001

National Electrical Code (NEC - NFPA 70)

National Electrical Manufacturers Association (NEMA)

National Fire Protection Association (NFPA 75)

Underwriters Laboratories (UL)

The system shall be UL listed as a complete system under UL 1950 Standard for Information Technology

Equipment.

The specified system shall comply with latest FCC Part 15 EMI emission limits for Class A computing devices and the emission and immunity limits of EN50081-2/EN550022 Class A and EN50082-2.

The system shall safely withstand the following without failure or damage:

Transient voltage surges on the AC power input as defined by ANSI/IEEE C62.41 for Category B3 locations (high surge exposure industrial and commercial facilities),

Electrostatic discharges (ESD) up to 10 kV at any point on the exterior of the unit, and

Electromagnetic fields from portable transmitters within 3 feet (1 meter) of the unit.

1.3

A.

SUMMARY

This Section includes power distribution units, distribution and branch circuit panelboards, overcurrent protective devices, and associated auxiliary equipment.

1.4

A.

B.

C.

DEFINITIONS

PDU: Power Distribution Unit.

RFI: Radio-frequency interference.

RMS: Root mean square.

1.5

A.

SUBMITTAL AND DOCUMENTATION REQUIREMENTS

The documentation associated with this bid proposal and contract including submittals, shop drawings,

Operation and Maintenance Manuals, and Spare Parts List shall be furnished as follows.

1.

2.

Six (6) hard copies of submittals and shop drawings shall be submitted for initial review.

Documents shall also be submitted in portable document format (PDF).

EYP Mission Critical Facilities, Inc. POWER DISTRIBUTION UNITS - PREPURCHASE

26 26 00 - 1



3.



Documents shall be submitted in AutoCAD – Latest Release - for Drawings and Microsoft Word

(latest version) for text format when requested.

B.

1.

2.

3.

Provide a Compliance Review of the Specifications, Drawings and Addenda (if any). The Compliance

Review shall be a paragraph-by-paragraph review of the Specifications with the following information; “C”,

“D” or “E” marked in the margin of the original Specifications and any subsequent Addenda.

“C”: Comply with no exceptions.

“D”: Comply with deviations. For each and every deviation, provide a numbered footnote with reasons for the proposed deviation and how the intent of the Specification can be satisfied.

“E”: Exception, do not comply. For each and every exception, provide a numbered footnote with reasons and possible alternatives. a. Unless a deviation or exception is specifically noted in the Compliance Review, it is assumed that the Bidder is in complete compliance with the plans and Specifications.

Deviations or exceptions taken in cover letters, subsidiary documents, by omission or by contradiction do not release the Bidder from being in complete compliance, unless the exception or deviation has been specifically noted in the Compliance Review. Bidders may submit the latest state-of-the-art components and their standard control components in lieu of the specified items. The Design Professional and Owner must approve all deviations from the Specifications.

1.6

A.

B.

C.

SUBMITTALS

The Power Distribution Unit (PDU) is Owner furnished (prepurchased) and Contractor installed. The PDU shall be shipped Free on Board (FOB) destination jobsite. The Contractor shall coordinate the delivery date with the PDU Supplier. The Contractor is responsible for receiving and unloading the PDU, which must be witnessed by the PDU Supplier. The Contractor and the PDU Supplier shall inspect the PDU immediately upon arrival for any damage and missing components. The Contractor shall notify the Owner in writing to identify any damage and missing components on the same day the PDU is received. The failure to provide the Owner with a damage notification upon receipt of the PDU shall constitute Contractor acceptance of the PDU. Following acceptance of the PDU, the Contractor shall be responsible for protecting the PDU and maintaining the manufacturer's warranty of the PDU in a manner acceptable to the

Owner and PDU Supplier. The PDU shall be stored in the Loading Dock 125 at a location designated by the Owner. The Contractor is responsible for uncrating, moving, installing, coordinating startup and testing, providing test equipment, and commissioning support for the PDU as shown on the drawings and specifications. The PDU Supplier shall attend and participate in the equipment delivery inspection, startup, system testing/commissioning, and training activities.

Product Data: For each type of power distribution units, overcurrent protective device, TVSS device, accessory, and component indicated, include dimensions and manufacturers' technical data on features, performance, electrical characteristics, ratings, and finishes.

2.

3.

4.

Shop Drawings: For each power distribution unit and related equipment.

1. Dimensioned drawings with elevations, sections, and details. Show tabulations of installed devices, equipment features, and ratings. Include the following: a. b. c. d. e. f.

Enclosure types and details for types other than NEMA 250, Type 1.

Bus configuration, current, and voltage ratings.

Short-circuit current rating of components and overcurrent protective devices.

Features, characteristics, ratings, and factory settings of individual overcurrent protective devices and auxiliary components.

Circuit breaker data sheets and time-current curves

Metering and CT data sheets

Wiring Diagrams: Diagram power, signal, and control wiring and differentiate between manufacturer-installed and field-installed wiring.

Listing of modbus RTU registers and details of communications protocol.

Guaranteed efficiency data at 0%, 25%, 50%, 75%, and 100% kW load.


26 26 00 - 2



D.



Equipment Manual - The manufacturer shall furnish an installation manual with installation, start-up, operation, and maintenance instructions for the specified system.

E. Field Test Reports: Submit written test reports and include the following:

1.

2.

3.

Test procedures used.

Test results that comply with requirements.

Results of failed tests and corrective action taken to achieve test results that comply with requirements.

F.

1.

2.

3.

Closeout Submittal Package: The product submittal/shop drawings, Spare Parts List, Operation and

Maintenance Manuals, and Warranty documentation shall be submitted to the Owner and Design

Professional for review.

Submit electronic copy of approved submittal package to Owner and Design Professional. The electronic copy shall be in searchable Adobe Acrobat PDF format.

Submit three (3) hard copies of the product submittal/shop drawings to Owner and Design

Professional for Project Closeout. Incorporate all initial review comments.

The Contractor shall provide a cover page to identify each submittal item with the following: a. b. c. d. e. f. g.

Project Title and Location

Project Team Names and Addresses (Owner, Design Professional, and Contractor)

Project Team Reference Numbers (Owner, Design Professional, and Contractor)

Supplier’s Name, Address, and Contact Information

Manufacturer’s Name, Address, and Contact Information

Submittal Package Number

Applicable Specification Section, Article Number, and Drawing Number

1.7 Environmental Requirements

1.

2.

3.

4.

Storage temperature range shall be -55 to +85°C (-67 to +185°F).

Operating temperature range shall be 0 to 40°C (+32 to 104°F).

Operation shall be reliable in an environment with 0% to 95% non-condensing relative humidity.

The audible noise level of the specified system shall be less than the ANSI C89 standard for transformers.

1.8

A.

1.9

A.

1.10

A.

QUALITY ASSURANCE

The specified system shall be factory-tested before shipment. Testing shall include, but shall not be limited to: Quality Control Checks, "Hi-Pot" Test (two times rated voltage plus 1000 volts, per UL requirements), and Metering Calibration Tests. The manufacturer shall be ISO 9001 certified.

WARRANTY

The manufacturer shall provide a one-year warranty against defects in material and workmanship commencing on Date of Substantial Completion.

MANUFACTURERS

The following manufacturers are acceptable provided their equipment complies with the requirements of this specification.

1. PDI PowerPak

PART 2 - PRODUCTS

2.1 RATINGS


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A.


The full load continuous capacity of 300 kVA unless otherwise noted.


B.

C.

D.

Input voltage: 480 VAC

±

15%, three (3) phase, three- (3) wire plus ground.

Input/output frequency: 60 Hz

±

5 Hz.

Output voltage: 208/120 VAC

±

15%, three (3) phase, four- (4) wire solidly grounded wye.

E. Load Power Factor: Between 0.6 lagging and 0.6 leading power factor.

2.2

F.

A.

Harmonic Distortion, output voltage: Less than 1% added.

COMPONENTS

Enclosure and Frame

1.

2.

3.

4.

5.

6.

7.

The PDU shall be housed in a modular configured, free standing NEMA-1 enclosure with dead front construction. The PDU shall accommodate bottom fed cables. The system monitor panel, input and output circuit breakers shall be accessible from the front. All customer power and control connection points shall be accessible from the front or side of the PDU enclosure. All PDU circuit breakers are protected with "hinged dead front" panels to prevent access without a tool.

The PDU shall be provided with a floor stand with height and leveling adjustment to trim flush with finished raised floor. The raised floor height is 36 inches nominal.

The frame shall be constructed of welded steel to provide a strong substructure. The enclosure shall be mounted on four (4) heavy-duty swivel casters for portability and ease of installation, and shall be provided with four permanent leveling jacks for final installation.

The removable exterior panels shall be grounded to the frame by way of stranded copper wire.

Hinged double front doors shall provide access to the main input circuit breaker, and to all output circuit breakers. The unit shall be painted the custom color to match the existing unit PDU – 135 –

RCH - 1.

The unit shall be naturally convection-cooled. No fans for forced-air cooling system shall be used.

The convection cooling method shall allow continuous full-load operation without activation of overtemperature circuits. Heat rejection shall be through a screened protective top. The frame shall be configured to accept future field installation of additional bolt-on distribution sections containing additional panelboard and cable tray capacity.

Required service clearances to perform all preventive and remedial maintenance shall be front plus one other side. Rear service clearance shall not be required.

The assembly shall be constructed with hinged covers and doors so that the equipment may be readily opened for visual access for IR scanning of all bus and cable terminations and the power transformer.

B. Input Power Connections

1. The PDU shall be capable of accepting input power connections from the top, side, or bottom.

C. Main Input Circuit Breaker

1.

2.

The specified unit shall be provided with a main input circuit breaker for overcurrent protection and a disconnecting means. The main input circuit breaker shall be a three-pole molded case circuit breaker sized for 500 A and rated for 600 VAC. The minimum UL-listed interrupting rating for the main input circuit breaker shall be 65,000 RMS symmetrical amperes at 480 volts AC.

The main input circuit breaker shall include a 120 VDC shunt trip mechanism to interface with unit controls, EPO buttons and other remote controls as required by the NEC and local codes.

D. Isolation transformer

1. The output rating of the transformer shall be the same as the continuous duty maximum full load rating of the PDU. The isolation transformer is a NEMA ST20, factory-assembled, dry type; double shielded with Faraday shields for common-mode noise attenuation. One shield shall be located between the primary and secondary windings and the other shall be located between the core and


26 26 00 - 4




Issue for Prepurchase 6/5/2015 the windings. The isolation transformer shall have 200% rated neutral and shall employ six (6), 1 ½ full load compensation taps (two [2] above and four [4] below nominal). The transformer shall be a three-wire delta connected input winding and four-wire wye connected 208Y/120 VAC output winding.

2.

3.

Rated Power 300 kVA

K-Factor: K-20

Windings: All copper

Harmonic Distortion: 1% maximum voltage additive

Efficiency: NEMA TP-1

Insulation System: Class “H”220

°

C, with 150

°

C winding temperature rise

Winding Taps: 2.5% increments, (2) FCAN (5%), (4) FCBN (10%)

Sound Levels: Maximum 50dB at 4 feet from enclosure

Impedance: 3% to 4.5% at rated load

Basic impulse Level: 10kV

Magnetic Field Strength: < 0.1 gauss measured 1.5 feet from cabinet.

Temperature Sensor: 180

°

C and 195

°

C, Built into center windings

Common Mode: -120 dB, 10Hz to 1 MHz

Normal Mode: - 20 dB

The isolation transformer shall contain two (2) overload protection devices to monitor core temperatures. The devices shall be Normally Open (N.O.) contacts to eliminate potential downtime from a sensor failure. At 180oC the first thermal device shall close and cause an alarm on the status panel. At 200oC the second thermal device shall close and shunt trip the main input circuit breaker.

The transformer shall be cooled by natural convection means.

E. Manual Restart

1. The specified unit shall be equipped with a manual restart feature to allow for an orderly supervised startup after power failure. The control circuit shall automatically energize the shunt trip mechanism of the main input breaker upon sensing output voltage failure. A field-selectable auto-restart mode shall be provided to deactivate the manual restart if desired.

F. Emergency Power Off (EPO)

1.

2.

The local EPO shall include a fully guarded and illuminated "Emergency Power Off" pushbutton.

Pressing the EPO switch shall immediately shut down the unit by activating the shunt trip of the main input circuit breaker.

As part of the EPO circuit, an interface shall also be provided for connecting one or more normally open or normally closed remote EPO switches to the EPO circuit. For flexibility in meeting shutdown control schemes, the local EPO (unit shutdown) circuit shall be isolated from the remote

EPO (room shutdown) circuit. The remote EPO circuit shall be designed to allow direct connection of multiple units with single and multiple shutdown control contacts.

G. Computer Grade Ground

1. The specified system shall include a computer-grade, single-point ground in accordance with computer manufacturer’s recommendations, IEEE Std. 1100, and the requirements of the NEC.

The transformer output neutral shall be solidly grounded in accordance with NEC article 250-26.

H. PDU Output Distribution Panelboard

1.

2.

3.

4.

5.

Each PDU shall contain an output distribution panelboard as an integral part of the PDU. The distribution panelboard section shall have main access from the PDU front with side access to the cable compartment. The distribution section cabinet shall be of the same construction and appearance as the PDU.

Type: NEMA PB1, circuit breaker capable bolt-on circuit breakers.

Output feeder circuit breakers shall be molded-case 400 ampere rated with 42,000 kAIC RMS

Symmetrical rated minimum. Provide six (6) 400 ampere output feeder breakers.

Copper Ground bus.

Copper Neutral Bus: 200% of nominal phase current.


26 26 00 - 5



6. Breakers shall be Square D.



I. Power Metering for Output Feeders

1. Each output feeder breaker shall be provided with a power meter for monitoring by the EPMS. The meters shall be installed in the PDU Distribution section and shall be visible from a viewing window installed in the cabinet door. Opening the door shall provide access to the meter displays.

2.3

J.

A.

B.

Output Branch Circuit Panelboards – No Requirements

POWER MONITORS

Display

1.

2.

Backlighted LCD to display metered data with touch-screen or touch-pad selecting device.

Touch-screen display shall be a minimum 12-inch diagonal, resolution of 800 by 600 and display four values on one screen at same time.

3. a. b. c. d. e. f. g. h. i. j. k. l.

Current, per phase RMS, three-phase average and neutral.

Voltage, phase to phase, phase to neutral, and three-phase averages of phase to phase and phase to neutral.

Real power, per phase and three-phase total.

Reactive power, per phase and three-phase total.

Apparent power, per phase and three-phase total.

Power factor, per phase and three-phase total.

Frequency.

Demand current, per phase and three-phase average.

Demand real power, three-phase total.

Demand apparent power, three-phase total.

Accumulated energy (MWh and MVARh).

THD, current and voltage, per phase.

Reset: Allow reset of the following parameters at the display: a. b. c.

Peak demand current.

Peak demand power (kW) and peak demand apparent power (kVA).

Energy (MWh) and reactive energy (MVARh).

RMS Real-Time Measurements:

1.

2.

3.

4.

5.

6.

Current: Each phase, neutral, average of three phases, percent unbalance.

Voltage: Line-to-line each phase, line-to-line average of three phases, line-to-neutral each phase, line-to-neutral average of three phases, line-to-neutral percent unbalance.

Power: Per phase and three-phase total.

Reactive Power: Per phase and three-phase total.

Apparent Power: Per phase and three-phase total.

Power Factor: Per phase and three-phase total.

7.

8.

Displacement Power Factor: Per phase and three-phase total.

Frequency.

9. THD: Current and voltage.

10. Accumulated Energy: Real kWh, reactive kVARh, apparent kVAh (signed/absolute).

11. Incremental Energy: Real kWh, reactive kVARh, apparent kVAh (signed/absolute).

12. Conditional Energy: Real kWh, reactive kVARh, apparent kVAh (signed/absolute).

C. Demand Current Calculations, per Phase, Three-Phase Average and Neutral:

1.

2.

3.

4.

Present.

Running average.

Last completed interval.

Peak.


26 26 00 - 6



D.


Demand Real Power Calculations, Three-Phase Total:


1.

2.

3.

4.

5.

6.

7.

Present.

Running average.


Predicted.

Peak.

Coincident with peak kVA demand.

Coincident with kVAR demand.

E. Demand Reactive Power Calculations, Three-Phase Total:

1.

2.

3.

4.

5.

6.

7.

Present.

Running average.


Predicted.

Peak.



F. Demand Apparent Power Calculations, Three-Phase Total:

1.

2.

3.

4.

5.

6.

7.

Present.

Running average.


Predicted.

Peak.



G. Average Power Factor Calculations, Demand Coincident, Three-Phase Total:

1.

2.

3.

4.


Coincident with kW peak.

Coincident with kVAR peak.

Coincident with kVA peak.

H.

I.

Accuracy:

1.

2.

Comply with ANSI C12.20, Class 0.5; and IEC 60687, Class 0.5 for revenue meters.

Accuracy from Light to Full Rating: a. b. c. d.

Power: Accurate to 0.25 percent of reading, plus 0.025 percent of full scale.

Voltage and Current: Accurate to 0.075 percent of reading, plus 0.025 percent of full scale.

Power Factor: Plus or minus 0.002, from 0.5 leading to 0.5 lagging.

Frequency: Plus or minus 0.01 Hz at 45 to 67 Hz.

Communications – Each Monitor

1. RS-485 port on meter unit: 2-wire connection, up to 38.4 kbaud, Modbus RTU

2.4

A.

PDU CONTROLS AND MONITORING

The specified system shall be equipped with a microprocessor-based power monitor panel. The monitor panel shall gather and process information from electrical and environmental sensors, relays and switches both internal and external to the unit. The monitored parameters and alarms shall be displayed on the unit monitor panel and shall also be available for communication to the existing Electrical Power Monitoring system using a two-wire, twisted-pair, low-voltage signal circuit having an RS-422 format for reliable communication up to 1000 meters. Additionally, the monitor panel shall be equipped with an RS-232 service port for adjusting parameters and performing diagnostics.


26 26 00 - 7



B.



Provide communications interface link and communications protocol for third party communications to the monitoring system.

C.

D.

Provide a Power Monitor on the PDU incoming line with monitoring and communications as specified herein.

Monitored Parameters

1. The monitoring system shall monitor and display all of the following parameters:

2. a. b. c. d. e. f. g. h. i. j. k.

Input Voltage, Line-To-Line for all three phases

Output Voltages, Line-to-Line for all three phases

Output Voltages, Line-To-Neutral for all three phases

Output Current for all three phases

Output Neutral Current

System Ground Current

Output Frequency

Output kVA

Output kW

Output Power Factor

Percent Load

All three phases of the three-phase parameters shall be displayed simultaneously. All voltage and current parameters shall be monitored using true RMS measurements for accurate representation of non-sinusoidal waveforms typical of computers and other sensitive loads.

E. Alarm Annunciation

1. The monitoring system shall detect and annunciate by audible alarm and alarm message the following conditions:

2.

3. a. b. c. d. e. f. g. h. i.

Output Overvoltage

Transformer Over-temperature

Output Undervoltage

Frequency Deviation

Output Overcurrent

Phase Sequence Error

Neutral Overcurrent

Phase Loss

Ground Overcurrent

All alarm thresholds for monitored parameters shall be adjustable by way of the service port to match site requirements. The factory setpoints for the alarms shall be as follows: a. b. c. d. e. f. g.

Output Overvoltage - output voltage exceeds +6% of nominal

Output Undervoltage - output voltage falls below - 13% of nominal

Output Voltage Distortion - Output voltage exceeds 10%THD.

Output Overcurrent - output current exceeds 95% of full load amps

Neutral Overcurrent - neutral current exceeds 95% of full load amps

Ground Overcurrent - ground current exceeds 5 amps

Frequency Deviation - output frequency exceeds +/-0.5Hz of nominal

To facilitate troubleshooting, all alarms shall be stored in battery-backed (non-volatile) memory until reset to protect against erasure by a power outage. Alarms shall be able to be manually reset after the alarm condition has been corrected either at the unit or by way of the central monitoring system.

F. Custom Alarm Annunciation

1. The monitoring system shall be capable of providing alarm annunciation for up to five contact closures (4 N.O. and 1 N.C.). A custom alarm message up to 20 characters shall be provided for each contact. Alarm messages shall be programmable by way of the service port to match site requirements.


26 26 00 - 8



G. Summary Alarm Contact

1.



A Form C (1 N.O. and 1 N.C.) Summary Alarm Contact shall be provided for remote alarm status.

The contacts shall change state upon occurrence of any alarm and shall rest upon alarm silence.

H. Display

1. All monitored parameters and alarm messages shall be displayed on a 4 x 20 character, high visibility liquid crystal display (LCD) located on the unit front door within a decorative bezel.

Included in the bezel shall be an Identifying Unit Number, Emergency Power Off (EPO) switch, and an Alarm Present/Silence switch. The Alarm Present/Silence switch shall be illuminated upon occurrence of any alarm and remain illuminated until all alarms are reset. The switch shall also be used to silence the audible alarm and reset inactive alarms.

I. Autoscan

1. For ease of operation, the monitoring system shall include an autoscan mode that provides continuous sequential selection and display of all monitored parameters and active alarm messages. A "Hold/Sequence" switch shall be provided to interrupt the autoscan mode and manually select the displayed parameters when desired.

2.5

A.

B.

COMMUNICATIONS

Each PDU shall be provided with Ethernet communications card: 10/100 Base-T UTP port supporting

ModbusTCP/IP communications. Full-function embedded web server providing standard web browser access to meter data, PDU data, and STS data and the ability to email on an alarm from the host meter.

RS-485/232 port, 2- or 4-wire, Modbus RTU master port providing Ethernet-to-serial line gateway functionality.

The PDU shall provide an Ethernet gateway for the EPMS to the STS, PDU power monitors, and PDU metering, status, and alarms.

PART 3 - EXECUTION

3.1

A.

CONNECTIONS

Ground equipment according to Division 26 Section “Grounding and Bonding for Electrical Systems.”

1. Separately Derived Systems: Make grounding connections to grounding electrodes as indicated; comply with NFPA 70.

B.

3.2

A.

Connect wiring according to Division 26 Section “Low-Voltage Electrical Power Conductors and Cables.”

FIELD QUALITY CONTROL

The PDU manufacturer shall provide qualified field service technicians for assistance in the installation, startup, site acceptance testing, commissioning and integrated systems testing of the equipment. This work includes but is not limited to the following:

1.

2. a. b. c. d. e.

Instruct and train the contractor on the installation and wiring of the equipment.

Perform a detailed installation inspection and testing of the equipment prior to energizing.

Remove and re-install all circuit breakers for third party site testing.

Verify all internal wiring is correct.

Verify all power wiring connections are proper and tight.

Verify all control, instrumentation, and communications wiring connections are correct and tight.

A detailed checklist shall be completed for each unit and submitted for review prior to energizing.


26 26 00 - 9



3.

4.

5.



Manufacturer’s technician shall be present and participate in energizing the equipment.\

Assist in startup of monitoring system.

Perform a comprehensive test on the energized unit including:

6. a. b.

Load bank testing and infrared scanning.

Checkout of all metering, monitoring, and alarm functions and set-points including communications to remote monitoring system.

Assist in commissioning and integrated systems testing during 8-week period following Preliminary

Substantial Completion.

3.3

A.

3.4

A.

B.

3.5

A.

3.6

A.

STARTUP SERVICE

Engage a factory-authorized service representative to perform startup service.

1.

2.

3.

Verify that power distribution units are installed and connected according to the Contract

Documents.

Verify that electrical wiring installation complies with manufacturer’s submittal and with written installation requirements in Division 26 Sections.

Complete installation and startup checks according to manufacturer’s written instructions.

ADJUSTING

Set field-adjustable switches and circuit-breaker trip ranges as indicated.

Adjust power distribution units to provide optimum voltage to equipment served throughout normal operating cycle of loads served. Record input and output voltages and adjustment settings, and incorporate into test results.

CLEANING

Vacuum dirt and debris; do not use compressed air to assist in cleaning.

DEMONSTRATION

Engage a factory-authorized service representative to train Owner’s maintenance personnel to adjust, operate, and maintain power distribution units. Refer to Division 01 Section “Demonstration and Training.”

END OF SECTION 26 26 00


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