H259-- electrical 5-year ARC flash study (VA-27-00002938)

Arc Flash Hazard Analyses Scope of Work

General

Contractor shall conduct an Arc Flash Hazard Analyses in accordance with National Fire Protection Association (NFPA) 70E, Standard for Electrical Safety in the Workplace, NFPA 70, National Electric Code and Institute of Electrical and Electronics Engineers (IEEE) Guide for the Specification of Scope and Deliverable Requirements for an Arc-Flash Hazard Calculation Study in Accordance with IEEE Std 1584. The study will conform to the editions for the above-referenced standards in effect as of the date of the solicitation.

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. Data collection and documentation shall include the 208V system. 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.

Arc Flash Hazard Analyses Requirements

The Arc Flash Hazard Analyses will consist of the following phases or requirements:

Data Gathering and Field Verification

Contractor shall:

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.

Gather and document necessary system data required to complete the study. Data should include but is not limited to (as applicable):

Location (building, room, etc.)

Equipment Identification

Equipment Information

Manufacturer, Model, Catalog Number and Type

Equipment Rating (Voltage, Ampacity, Interrupting Rating, etc.)

Configuration (Main Lug, Main breaker, Number of breakers, etc.)

Overcurrent Protection

Relaying Type, Manufacturer, Function(s), CT and PT ratios, etc.

Fuses Type, Manufacturer, Rating, etc.

Existing Settings

Cable Type, Size and Length (lengths are to be field confirmed)

Cable Busway Type, Manufacturer, Rating and Length

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

Contractor must coordinate with facility engineering staff to obtain necessary power company data such as minimum and maximum fault currents as well as X/R ratios.

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

Data collection requires the removal and/or opening of equipment to field verify data.

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.), etc.

Short Circuit Study

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:

Electric utility supply termination point.

Incoming switchgear.

Unit substation primary and secondary terminals.

Low voltage switchgear.

Motor control center

Standby generator and automatic transfer switch.

Branch panelboard.

The study shall 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 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 Study

Contractor shall provide a Protective Device Coordination Study to determine satisfactory setting and ratings for the facility s major 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) supporting findings and recommendation to be 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 Hazard Analyses

Contractor shall perform an Arc Flash Hazard Analyses in compliance with IEEE 1584, NFPA 70 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) to establish the worst-case incident energy level for each equipment studied under this study. Additionally, calculations should emphasize a conservative approach for the protection of personnel. Incident energy and flash protection boundary calculations results must be tabulated and included with project submittals.

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.

Equipment Labeling and Miscellaneous Work

Contractor shall provide and install arc flash warning labels for designated electrical devices evaluated under this study. All arc flash labels shall comply with NFPA 70E and include:

Equipment name or identifying designation

Nominal voltage

Flash hazard boundary

Hazard risk category

Incident energy

Working distance

Arc flash labels shall be machine printed with no field markings. Single labels shall be provided for designated equipment evaluated under this study.

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.

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:

Overview of each study phase and related issues.

Notable arc flash hazard areas.

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

National Electric Code (NEC) violations noted during the study.

Other electrical safety related issues.

Recommendations.

Submittals

Upon completion of the Arc Flash Hazard Analyses, Contactor shall submit four (4) 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:

Executive Summary.

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

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

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

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

Details of the incident energy and flash protection boundary calculations.

Recommendations for system improvements, where needed.

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

SKM Compatible Data Import Files.

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.

Qualifications

All work shall be conducted under the supervision and approval of a Registered Professional Electrical Engineer (PE). The PE shall have a minimum of five (5) years experience in performing and interpreting power systems studies.

Project Duration

Contractor shall complete all work within 180 days of notice to proceed.

Scheduling

Contractor shall 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.