36C25619R0132-002.docx

Electrical Study Statement of Work

STATEMENT OF WORK PART A – GENERAL INFORMATION

Contractor shall conduct an Arc Flash Study in accordance with National Fire Protection Association (NFPA) 70E, Standard for Electrical Safety in the Workplace and Institute of Electrical and Electronics Engineers (IEEE) 1584, Guide for Performing Arc Flash Hazard Calculations at the Alexandria VA Medical Center in Alexandria, LA. The study shall include all significant locations in the electrical distribution system (switchboards, switchgear, motor control centers, panelboards, busways, etc.) from the incoming utility equipment or cabling down to 208V systems where work could be performed on energized circuits. Data collection and documentation shall include all electrical systems 110 volts and above. The study shall be performed using software programs specifically designed to standards governing short-circuit; protective coordination and arc flash hazard calculations. Final submittals shall include a formal reporting of findings, collect data and study calculations in a comprehensive report.

Qualifications

The qualified individual shall possess an excellent working knowledge of NFPA 70E - Standard for Electrical Safety in the Workplace, IEEE 1584, NEC, and NESC, is a Registered Professional Engineer in one or more states under the full-time employment of an approved engineering firm. The Registered Professional Electrical Engineer shall have a minimum of five (5) years’ experience in performing and interpreting power systems studies. Have experience in performing studies for large-scale campus type facilities of 500,000 SF to 1,000,000 SF.

Project Duration

Contractor shall complete all work within 150 days from notice to proceed.

Scheduling

Contractor will perform onsite work during normal operating hours (7:30 AM to 4:30 PM), Monday through Friday. Work to be performed outside of normal working hours must be coordinated with and approved by the COR. Work requiring a power outage must be submitted in writing (including date and duration of outage) to the COR not later than two weeks prior to the requested date.

Data Collection

Qualified staff is expected to collect data onsite from all applicable electrical equipment. Required information includes but not limited to:

1. Field-verify and mark up existing single line drawings needed to perform an accurate study. In the event single-line drawings are not available, Contractor shall develop single-line drawings to reflect the “as built” configuration of the facility electrical system

2. Location (building, room, etc.)

3. Equipment identification

4. Equipment information (manufacturer, model, catalog number and type, equipment rating to include voltage, ampacity, interrupting rating etc., configuration to include main lug, main breaker, number of breakers etc.

5. Overcurrent Protection (relaying type, manufacturer, functions, CT and PT ratios, etc.)

6. Cable Type, size and length (to be field confirmed)

7. Cable Busway (Type, manufacturer, rating and length

8. Motor Load and Contactor Data (record data and application for motors 25 HP and above)

9. Contractor must coordinate with facility engineering staff to obtain necessary power

10. Company data such as minimum and maximum fault currents as well as X/R ratios

11. Correspondence documenting utility data shall be included in the final submittal

12. Data collection requires the removal and/or opening of equipment to field verify data. This equipment shall be infrared scanned at that time. Infrared camera must be capable of providing both thermal and visual image for each thermal issue.

13. Data from the utility, including available fault current, operating voltage, and specifics regarding the utility’s protective equipment at the point of service

14. Power sources may include Cogen, emergency generators, photovoltaic systems & others.

15. Specifics for each protective device in the electrical system, including manufacturer, model, available time/current settings, and short-circuit interrupting rating

16. Transformer impedance, tap settings and ratings

17. Conductor specifics, including lengths, sizes, and types of all electrical lines, bus ducts, cables in underground ducts and in conduits

18. Data collection requires observing each piece of equipment covered by this study. Contractor shall record and report any deficiencies, such as missing identifying labels, warning labels, non- functioning latches or locks, missing hardware (covers, screws, breaker blank fillers, etc.)

Power System Modeling

Use SKM PowerTools software to develop one-line diagrams and show the current configuration and modes of operation of the power system. Provide accurate electrical system drawings to identify the power sources, voltage levels, electrical equipment, and protective devices.

Short Circuit Study

Perform short circuit analysis to determine the magnitude of current flowing throughout the power system at critical points at various time intervals after a “fault” occurs. Provide calculations to determine the bolted fault current, incident energy and interrupting ratings of the equipment. Compare equipment ratings with calculated short circuit and operating conditions to identify underrated equipment. Follow the criteria in ANSI Std. C37 and IEEE Std. 141-1993 (Red Book). Contractor shall use field-verified single line drawings and data to perform a three-phase bolted fault short-circuit momentary and interrupting duties system short circuit calculation for the facilities electrical system. The calculations shall be conducted in accordance with applicable ANSI C37.010, C37.5, C37.13, NFPA 70E, NEMA, and NEC standards and codes. At a minimum the following location shall be included:

1. Electric utility supply termination point.

2. Incoming switchgear.

3. Unit substation primary and secondary terminals.

4. Low voltage switchgear.

5. Motor control center

6. Standby generator and automatic transfer switch.

7. Branch panelboard.

8. Other significant locations throughout the system.

The study shall clearly identify, and report data used in the calculations in both descriptive terms (cable wire size, motor hp, transformer kVA and impedance, etc.) and impedance values.

Transformer nameplate impedance shall be used when available. A section of the study shall be devoted to verification of equipment duty ratings clearly identifying whether equipment is within or operating outside it interrupting rating. Short circuit calculations must be tabulated and included with the project submittals.

Protective Device Coordination

Perform protective device coordination to ensure selection and arrangement of protective devices limit the effects of an over-current situation to the smallest area possible. Use the results to make recommendations for mitigation of arc flash hazards. Contractor shall provide a Protective Device Coordination Study to determine satisfactory setting and ratings for the facility’s protective devices in accordance with applicable industrial standards such as ANSI/IEEE 399 and ANSI/IEEE 242. Coordination Study results must include time-current curves (TCC) and provided with project submittals. Deficiencies in device settings or-rated equipment are to be noted in the report. Protective device settings are to be tabulated separately and included within the report.

Arc Flash Analysis

Determine the incident energy levels and arc-flash protection boundaries based on available short circuit current, protective device clearing time and distance from the arc. Perform the calculation of incident energy levels and flash protection boundaries for all relevant equipment busses. Use the methods from NFPA 70E, and IEEE 1584 as applicable. Contractor shall perform an Arc Flash hazard analysis in compliant with IEEE 1584 and NFPA-70E. Flash protection boundary and incident energy levels shall be calculated at all significant locations in the electrical distribution system. Incident energy calculations must consider multiple system scenarios (normal, emergency, parallel, etc.) to establish the greatest incident energy level for each equipment location. Additionally, calculations should reflect the most conservative approach to provide the highest degree of protection to personnel. Incident energy and flash protection boundary calculations results must be tabulated and included with project submittals.

Voltage Drop Calculations

Provide voltage drop calculations for all three-phase branch and feeder circuits. Show calculated voltages at each bus and voltage drops on each feeder.

Protective Device Settings

Contractor shall set adjustable protective devices to reflect proposed settings identified in the Protective Coordination Study. This must be coordinated with facility engineering staff as certain device settings can only be performed during a power outage.

Reporting

The final report shall include system one-line diagrams, Short Circuit and ground fault analysis, protective coordination plots, voltage drop calculations and arc-flash labels for each location. The final report shall be stamped by a Registered Professional Engineer. Provide report in both print and digital formats. Complete SKM backup files shall be included.

Label Installation

Provide arc flash hazard warning labels that identify incident energy and working distance, nominal system voltage, the arc flash boundary and recommended personal protection equipment (PPE). Labels shall be in compliant with NFPA 70E 130.3(c) and NEC 110.24(A). Contractor shall provide and install arc flash warning labels for each electrical equipment item evaluated under this study. Panelboards where arc flash calculations were not required must be labeled to reflect standard hazards as outlined in NFPA-70E. All labels shall include:

a. Location

b. Circuit identification

c. Nominal voltage

d. Flash hazard boundary

e. Hazard risk category

f. Incident energy

g. Working distance

Arc Flash Labels shall be machine printed with no field markings. Single labels shall be furnished for panelboards and multiple labels furnished for switchgear, switchboards, motor control centers, etc. (as applicable).

Contractor shall install applicable labels (customary warning labels –high voltage, Owner-provided equipment identification labels, etc.) found missing or deficient while collecting field data and as agreed with the facility engineering staff.

Contactor shall install applicable hardware (missing screws, breaker blank fillers, latches, etc.) found missing or deficient while collecting field data and as agreed with the facility engineering staff.

Hazard Orientation

Following arc flash warning label installation, Contractor shall provide a minimum 4-hour arc flash awareness training class for personnel identified by facility engineering staff. Training must be NFPA- based to include:

a. Potential arc flash hazards associated with working on energized equipment,

b. Show and discuss each level of personal protective equipment (PPE) and effects of combining levels, and

c. Site visit with attendees to at least two recently-labeled areas designed to discuss facility- specific hazards and PPE requirements to perform energized work.

Exit Briefing

Upon completion of the study but prior to issuing study submittals, Contractor shall conduct an exit briefing for facility engineering staff and others designated representatives. The briefing shall include:

1. Overview of each study phase and related issues.

2. Identification of defective or improperly rated equipment including results of infrared scanning.

3. Dangerous arc flash hazard areas.

4. Recommended solutions for mitigating dangerous arc flash hazard levels to include potential implementation of “maintenance settings.

5. National Electric Code (NEC) violations.

6. Other electrical safety related issues.

7. Recommendations.

Submittals Upon completion of the Arc Flash Study, Contactor shall submit three (3) bound copies including electronic version on CD or DVD of the final report containing the following:

Power System Studies - The completed short-circuit, protective device coordination arc flash hazard analysis studies shall include the following sections:

1. Executive Summary.

2. Descriptions, purpose, basis, and scope of the studies.

3. Tabulation of circuit breaker, fuse, and other protective device ratings versus calculated short-circuit duties.

4. Protective device time versus current coordination curves, tabulations of relay and circuit breaker trip unit settings, and fuse selection

5. Fault current calculations including a definition of terms and guide for interpretation of the computer printout.

6. Details of the incident energy and flash protection boundary calculations.

7. Recommendations for system improvements, where needed.

8. Electrical system one-line diagram in printed and electronic version. The electronic version must be in AutoCAD and PDF formats.

Thermographic Report

i. Tabulation of all equipment items (by location, equipment type and circuit identification infrared scanned as a part of the study.

ii. Thermographic report section identifying each reportable deficiency to include among other things:

1. Thermal image

2. Visual image

3. Thermal readings

4. Location

5. Condition and probable cause

6. Priority level

7. Recommended action

Supplemental Report

Contractor shall prepare a report documenting findings and observation not addressed elsewhere in the submittals. This section shall include condition of found equipment and corrective actions taken to resolve or repair same.