FCTC SOW & Technical Spec (23 April 2024).pdf

260573 – Fort Custer Arc Flash Study

Technical portion of the Short Circuit/Equipment Evaluation Study, Time Current Coordination Study, and Arc Flash Analysis.

1. PURPOSE

This Request for Proposal (RFP) is to solicit proposals to establish a contract with a qualified and experienced Firm to provide Short Circuit/Equipment Evaluation, Time Current Coordination Study, and Arc Flash Analysis Study Services for the Department of Military & Veterans Affairs (DMVA) at the Fort Custer Training Center (FCTC). Arc Flash Analysis “Services” also include the utilization of the study’s results and transferring the data onto machine generated Arc-flash labels and affixing them onto the field equipment studied.

2. SCOPE OF WORK

Provide the DMVA a Short Circuit / Equipment Evaluation, Time Current Coordination Study, and Arc Flash Analysis Study of the 24.9 kV electrical distribution system of the FCTC Installation.

The limits of the Study shall begin at the single Utility Primary Source of Connection and end at (including but not limited to) all external Single & Three Phase Panelboards, Switchboards, Fused Switches, Solar Cell Installations, and Serviceable Enclosures/Equipment. Standby Power Generators and solar fields along with associated Equipment shall also be included in this study.

Single Phase Medium Voltage transformers sized at less than 10kVA and Three Phase Medium Voltage transformers sized at less than 75kVA may be omitted from the computer model and will be assumed to have a hazard risk category 0. Refer to TABLE 1 shown on Sheet E1. Once the studies have been completed, the contractor shall follow the steps laid out in the Arc Flash Labels area of these technical specifications, print-out stick-on labels, and post them on the field equipment studied.

METHODS

The Study shall be performed with the aid of a digital computer program designed for such purposes and shall be accomplished in accordance with the latest applicable references and standards as defined below. A statement of the name of, the version of, and the company selling the digital computer program shall be included in the report along with a CD copy of the input data and results data for DMVA’s future use to upgrade the study when the system is enlarged, changed, or requiring recalculations.

3. REFERENCES

The Study shall be performed in accordance with the latest published version of the following Codes, Standards, and Industry recommendations:

Institute of Electrical and Electronics Engineers, Inc. (IEEE):

IEEE 141 – Recommended Practice for Electric Power Distribution and Coordination of Industrial and Commercial Power Systems (Red Book) IEEE 242 – Recommended Practice for Protection and Coordination of Industrial and Commercial Power Systems (Buff Book) IEEE 399 – Recommended Practice for Industrial and Commercial Power System Analysis (Brown Book) IEEE 241 – Recommended Practice for Electric Power Systems in Commercial Buildings (Gray Book) IEEE 1015 – Recommended Practice for Applying Low-Voltage Circuit Breakers Used in Industrial and Commercial Power Systems (Blue Book) IEEE 1584 2018 – Guide for Performing Arc-Flash Hazard Calculations

American National Standards Institute (ANSI):

ANSI C57.12.00 – Standard General Requirements for Liquid-Immersed Distribution, Power, and Regulating Transformers ANSI C37.13 – Standard for Low Voltage AC Power Circuit Breakers Used in Enclosures ANSI C37.010 – Standard Application Guide for AC High Voltage Circuit Breakers Rated on a Symmetrical Current Basis ANSI C 37.41 – Standard Design Tests for High Voltage Fuses, Distribution Enclosed Single- Pole Air Switches, Fuse Disconnecting Switches and Accessories.

National Fire Protection Association (NFPA):

NFPA 70 – National Electrical Code.

NFPA 70B – Recommended Practice for Electrical Equipment Maintenance.

NFPA 70E – Standard for Electrical Safety Requirements for Employee Workplaces.

4. QUALIFICATIONS

The successful Firm shall be referred to as the Contractor throughout this document.

The approved Contractor shall document experience with Arc Flash Hazard Analysis by submitting descriptions of at least five (5) previous projects completed within the past five (5) years, with owner names and contact information to include email and phone number.

The Study shall be completed under the responsible charge and approval of a Registered Professional Electrical Engineer licensed in the State of Michigan. All studies shall bear a signed and dated professional engineering seal. Contractors shall include with their proposal the name and qualifications of the individual proposed to complete the Study.

The Electrical Engineer proposed to complete the Study shall have a minimum of five (5) years’ experience performing electrical power studies including arc flash hazard analysis. Provide copies of the individual Electrical Engineer’s state registrations and licenses with proposal.

5. STUDY

Required system data shall be comprised of actual equipment nameplate and test results and assumptions as required. Assumptions shall be used when actual data is not provided or available.

The following minimum requirements shall apply:

DATA COLLECTION

Field data collection shall be performed to ensure accurate system modeling. Contractor shall provide a licensed electrician to assist in data collection and to open all equipment for inspection as required.

When actual data cannot be determined in the field, additional data may be requested as required throughout the term of the contract. The DMVA will attempt to provide additional available system and equipment data as required by the Study. Data may include but not necessarily limited to existing oneline diagrams, equipment submittal packages, actual nameplate data, and equipment test results, etc.

Obtain from the utility the operating voltages level, three phase short circuit MVA and X/R ratio and line-to-ground MVA and X/R ratio at the customer point of connection to the utility. DMVA shall provide a Point of Contact at the applicable electrical utility power company. DMVA shall coordinate with utility to explain the project and ensure cooperation by utility in providing required information. Any costs required by the utility shall be the responsibility of the DMVA unless otherwise agreed to by the DMVA and Contractor.

Typical conductor impedances shall be based on IEEE Standards 141-1998.

Typical transformer design impedances shall be used when actual test or nameplate impedances are not available.

When other required data or test results are not available, utilize standard industry assumptions, as needed or required, to complete the Study.

SHORT CIRCUIT / EQUIPMENT EVALUATION STUDY

The Study shall include the following information and data:

• Calculation methods and assumptions.

• Selected base per unit quantities.

• One-line diagram of the system being evaluated.

• Source impedance data, including electric utility system and motor fault contribution characteristics.

• Typical calculations.

• Tabulations of calculated quantities.

• Results, conclusions, and recommendations.

Short-circuit momentary and interrupting duties for a three-phase bolted fault shall be calculated at each of the following locations as applicable:

• Electric utility’s supply termination point.

• Incoming switchgear.

• Unit substation primary and secondary terminals.

• Low voltage switchgear.

• Standby generators, solar fields, and automatic transfer switches.

• Branch circuit and distribution panelboards.

• Other significant locations throughout the system.

• For grounded systems, a bolted line-to-ground fault current study shall be provided for areas as defined for the three-phase bolted fault short-circuit study above.

• Short circuit calculations shall include fault contribution from all connected motors.

Equipment Evaluation:

• Equipment and protective devices shall be evaluated for proper short circuit ratings.

• Switchgear and panelboard bus bars shall be evaluated to withstand short-circuit stresses.

• Transformer windings shall be evaluated to withstand short-circuit stresses.

• Cable and busway sizes shall be evaluated for ability to withstand short-circuit heating.

• Circuit protective devices improperly rated for the calculated available fault current shall be identified.

TIME CURRENT COORDINATION STUDY

• Proposed protective device coordination time-current curves shall be graphically displayed on log-log scale paper.

• Device characteristic curves shall be terminated at a point reflecting maximum symmetrical or asymmetrical fault current to which device is exposed.

• Devices associated with each curve shall be identified by manufacturer type, function, and, if applicable, tap, time delay, and instantaneous settings recommended.

• The following characteristics shall be plotted on the curve sheets, where applicable:

1. Electric utility’s protective device.

2. Medium voltage equipment relays.

3. Medium and low voltage fuses including manufacturer’s minimum melt, total clearing, tolerance, and damage bands.

4. Low voltage equipment circuit breaker trip devices, including manufacturer’s tolerance bands.

5. Transformer full-load current, magnetizing inrush current, and ANSI transformer withstand parameters.

6. Conductor damage curves.

7. Ground fault protective devices, as applicable.

8. Pertinent motor starting characteristics and motor damage points.

9. Pertinent generator short-circuit decrement curve and generator damage point.

• All attempts shall be made to fully coordinate the system being studied but due to certain circuit breaker characteristics, some systems may not coordinate. DMVA understands and accepts this as a condition of this agreement. Adequate time margins shall be provided between device characteristics such that selective operation is provided, to the extent possible, while still meeting all life safety requirements and providing proper equipment protection. Life Safety, and then Equipment Protection shall take precedence over coordination for all cases.

ARC FLASH ANALYSIS

• Arc flash analysis shall be in accordance with IEEE 1584-2018 equations and methods.

• Arc Flash calculations shall be in conjunction with Short Circuit, Equipment Evaluations and Protective Device Coordination Studies defined herein.

• Calculate Arc Flash incident energy (IE) levels (cal/cm2), Flash Hazard Boundaries and required Personal Protection Equipment (PPE) category requirements at significant locations in the electrical system where work may be performed on energized parts including, but not necessarily limited to switchgear, switchboards, motor control centers, panelboard, and disconnect switches. The lower limit of the study shall be as defined in Part 2, Scope of Work statement.

• The arc flash hazard analysis shall be performed utilizing the facility operating conditions defined by the DMVA. Where multiple scenarios are identified, the arc flash hazard results shall report and compare each individual case. The final report shall describe, when applicable, how these conditions differ from normal operating conditions. Arc Flash labeling information shall reflect the worst-case conditions unless specifically indicated otherwise by the DMVA.

• For each piece of ANSI rated equipment (i.e. Metal Clad Switchgear) with a main device contained in an isolated compartment or cubicle, two calculations shall be made. One calculation shall be made for the main cubicle, sides or rear; and shall be based on the immediate upstream overcurrent device to clear the arcing fault. A second calculation shall be made for the front cubicles; and shall be based on the equipment’s main protective device to clear the arcing fault. For all other non-ANSI rated equipment, only one calculation shall be required that is based on the immediate upstream overcurrent device to clear the arcing fault.

• Arc flash calculations shall be based on actual over-current protective device clearing times. A maximum clearing time of two seconds shall be used based on IEEE 1584-2018 Annex B.1.2 where it is shown that personnel are likely to move outside of the flash boundary during an arc flash incident. Where it is not physically possible to move out of the flash hazard boundary in less than two seconds during an arc flash incident, the actual over-current protective device clearing times shall be used.

6. FORMAL REPORT

The results of the short circuit, protective device coordination and arc flash hazard analysis shall be summarized in a final report. The final report shall include the following sections:

Executive Summary: Shall include a comprehensive restatement of the document’s purpose, scope, methods, results, conclusion, findings, and recommendations.

Introduction: Purpose, basis, and scope of the study.

System Description: The system shall be defined including the limits of the Study.

Oneline Diagram: The oneline diagram shall include all equipment and devices identified and included in the study from the Source to the Load.

Short-Circuit Study Results: The solution method for the short circuit study shall be defined.

Results of the short circuit study shall be provided in table form and include the following for each device:

• PASS or FAIL status

• Description

• Voltage

• Interrupting Duty calculation

• Close and Latch calculated duty

• Fault rating percentage

Time Current Coordination Study Results: Time Current results shall include a brief description of the logic employed in the solutions. Time Current graphs of each device shall be provided. The graphs shall illustrate the degree of coordination of the various parts of the system being studied. A discussion page with the same title as the graph shall be included with each graph. Tables of results and recommended protective device settings shall be provided as follows:

Phase and Ground Relays:

Current transformer ratio Current setting Time setting Instantaneous setting Specialty non-overcurrent device settings Recommendations on improved relaying systems, if applicable.

Circuit Breakers:

Adjustable pickups and time delays (long time, short time, ground) Adjustable time-current characteristic

Adjustable instantaneous pickup Recommended trip setting, if applicable.

Arc Flash Analysis.

Results shall include the following information for the system:

PPE recommendations presented in clear, tabular format.

Tabular results of Flash Boundaries and working distances.

Tabular results of Incident Energy (IE) levels.

Written report of findings and recommendations Recommendations to reduce arc flash incident energy levels if applicable.

Arc-Flash Labels: The labels shall comply with NFPA 70E - 2018 compliant arc flash hazard warning labels and shall include the following information:

a. Equipment Name and Equipment Feed

b. AFIE flash hazard boundary

c. AFIE value (cal/cm2)

d. Hazard Risk Category

e. System Voltage

f. Limited Approach Boundary

g. Restricted Approach Boundary

h. Prohibited Approach Boundary

i. Required PPE

j. Contract Number

k. Date Installed

A sample label shall be provided to the DMVA for approval prior to printing.

Labels shall be thermal transfer type of high adhesion polyester with no field markings.

Labels shall be provided for equipment identified in the study per the following:

Ground Standing Equipment – Labels shall be provided on the front of each individual section.

Equipment requiring rear or side access shall have labels provided on each individual section access area. Equipment with multiple incident energies and flash protection boundaries shall be labeled as applicable.

Wall Mounted Equipment – Labels shall be provided on the front cover or a nearby adjacent surface depending on equipment configuration.

Labels shall be field installed by the Contractor.

Summary A complete analysis of the results shall be provided at the end of the report. Conclusions and recommendations shall be included based on the final results. Areas of concern that shall be addressed are Life Safety, Equipment Protection and Selectivity requirements.

Assumptions All assumptions utilized for the Study shall be identified.

Backup Data Backup data and documentation shall be provided for reference.

7. DELIVERABLES

DRAFT SUBMITTAL:

Provide an unbound, Draft copy of the Study for review prior to formal completion of the Study.

The Draft copy shall include sufficient study data to allow the Owner to make any decisions affecting the final outcome prior to the completed submittal.

FINAL SUBMITTAL:

1. The results of the Study shall be summarized in a final report. Two (2) bound copies of the completed final report shall be submitted to the Owner along with two pdf electronic copies.

Additionally, a statement of the name of, the version of, and the company selling the digital computer program shall be included in the report along with two (2) CD copies of the input data and results data for DMVA’s future use to upgrade the study when the system is enlarged, changed, or requiring recalcula�ons. Along with the above final Study reports, the contractor shall two (2) 3-ring binders and two pdf electronic CD copies of each Arc-flash label and associated equipment to which the label was applied with the following information:

A. Equipment name.

B. Location of equipment with intersection or closest building.

C. Equipment type (i.e. transformer, secondary switchgear, etc.).

D. Equipment size (i.e. kVA, amperage, DFSE number of positions).

E. Photo of equipment name label and one interior photo.

Studies shall be signed and sealed by the engineer of record licensed to provide engineering services in the State of Michigan.

FIELD ADJUSTMENT:

The Owner shall be responsible for adjusting any relay and protective device settings based on any recommendations included in the protective device coordination study.

Notify Owner in writing of any required minor modifications to equipment to accomplish conformance with the short circuit and protective device coordination studies.

Notify Owner in writing of any required major equipment modifications identified in the Study.

If the owner elects not to make any replacements or adjustments, Contractor shall furnish and install equipment arc flash warning labels based on actual existing equipment configuration and settings.

END OF TECHNICAL SECTION