TVA - TSP 1022 Arc Flash Assessment

Information

Document No.
Audit Title
Client / Site
Conducted on
Prepared by
Location
Personnel

Roles & Responsibilities (Section 1)

Are managers aware of their role and responsibility? Explanation: Managers are responsible for completing arc flash hazard analyses, maintaining these analyses, purchasing FR clothing and other PPE, communicating the hazards and necessary precautions to employees, and enforcing the requirements of this standard.
Is the Safety Process Ownership Team (POST) aware of their role and responsibility? Explanation: The Safety Process Ownership Team is an Agency team composed of representatives from TVA Health and Safety that is responsible for safety policies and procedures. The Safety POST is responsible for review, approval, and issuance of this procedure.
Are supervisors, foremen, and lead-persons aware of their roles and responsibilities? Explanation: Supervisors, foremen, and lead-persons are responsible for enforcing the requirements of this procedure for FR clothing and other PPE.
Is the Employee Technical Training and Organizational Effectiveness (ETT&OE) aware of their role and responsibility? Explanation: ETT&OE is responsible for developing training for engineers and technical employees in conducting arc flash hazard analysis and employee training on the requirements of this procedure.
Are employees aware of their roles and responsibilites. Explanation: Employees are responsible for wearing the appropriate FR clothing and other PPE required by this procedure and complying with the arc flash protection boundary as required in this procedure.

Arc Flash Hazards (Section 2)

Are incident energy levels associated with an electrical arc determined by the following factors: Maximum available short circuit current at the arc location; Duration of the electrical arc. Distance from the arc to the employee; The arc gap (distance between the two conductive objects at different voltage potential); The nominal voltage of the circuit.

Arc Flash Hazard Analysis (Section 3)

Is electrical circuits/equipment operating at 480 V and above analyzed to determine incident energy levels, appropriate Fire Resistant (FR) clothing and other PPE, and establish arc flash protection boundaries? Explanation: See Appendix B to TSP 1022 “Arc Flash Hazard Calculation and Protection Flow Chart”
Are circuits and equipment identified from key-diagrams, single-line electrical drawings, or walking down equipment? Explanation: The analysis begins at the generator or utility service supply and continues to switchgear, MCCs, panelboards, and termination points, i.e., motors and static loads, down to 480 V.
Is the analysis performed by or under the direction of an electrical manager or an individual with the knowledge and training to competently perform the analysis?
Are the following TVA methods used to performing arc flash hazard analysis? IEEE Standard 1584 for Electrical circuits at voltages 480 V to 15kV; ARCPRO software for electrical circuits at voltages greater than 15 kV and less than or equal to 60 kV; Arc flash will not be calculated at voltages above 60 kV. Explanation: IEEE Standard 1584 with either the Electrical Transient Analyzer Program (ETAP) PowerStation by Operation Technology, Inc., Arc Flash Module or the TVA 1584 Calculator to analyze potential arc flash hazards
Is the following information gathered to determine maximum available fault currents and trip times for protective devices? Key-diagram and/or single-line electrical drawings; Breaker settings and their time current curves; Fuses used and their time-current curves. Explanation: Breaker settings may be obtained from breaker/fuse coordination studies, breaker setting sheets, and/or engineering drawings. Breaker time-current curves may be obtained from breaker manufacture’s documentation, ETAP data library, and TVA relay setting sheets. Fuse time-current curves may be obtained from fuse manufacture’s documentation and/or ETAP data library.
Are the modes of operation for the electrical system where there may be multiple supply points through bus ties including any emergency generator(s) determined through discussions with engineering and operation staff? Explanation: Examples of different modes: One or more utility feeders in service; Utility interface substation secondary bus tie breaker open or closed; Unit substation with one or two primary feeders; Unit substation with two transformers with secondary tie opened or closed; MCC with one or two feeders, one or both energized; and, Generators running in parallel with the utility supply or standby alignments.
Do organizations identify the modes of operation where work on exposed energized circuits will be permitted? Explanation: Arc flash analysis is only performed on those modes of operation. Work on exposed energized circuits will not be permitted while the electrical system is in a mode of operation that has not been analyzed.
If TVA 1584 Calculator Method is used, are three-phase bolted fault currents for the modes of operation to be analyzed determined? Explanation: These currents can be determined by the short circuit (SC) analysis feature of ETAP. If an ETAP model of the electrical system is not available, the organization may use other recognized engineering methods or models for determining the fault currents. A motor fault contribution analysis is required for buses connected to large motors (100 hp or greater).
When using the ARCPRO method, is the available phase-to-ground fault currents for modes of operations to be analyzed determined?

Perform Arc Flash Hazard Analysis Using the TVA 1584 Calculator Method (Section 4)

Are the following parameters entered when utilizing the TVA Calculator for each operating mode selected for analysis? Bus name or identifier for every bus to be analyzed; Nominal voltage for each bus; Bus bolted fault current; Fault current in protective device; Breaker/fuse type; Trip time or fuse melting time; Opening time; Equipment type/class; System grounding type; Distance from the worker’s torso to the conductive part;

Perform Arc Flash Hazard Analysis Using the ARCPRO Calculator Method (Section 5)

Are the following parameters determined when using the ARCPRO Calculator? Based on single-phase faults in open air; Identify all buses and transmission lines to be analyzed; All generating capacity is assumed to be online; Obtain the maximum available phase-to-ground, 4-cycle transient fault current for each bus; Obtain the duration of the arc clearing time; Determine phase-to-ground fault current and clearing time at the beginning, mid-point, and end of the line for transmission lines. Explanation: The ARCPRO User’s Guide is used for conducting open-air arc flash hazard analysis.
Is the following data entered into the computer program for each arc fault case? Nominal phase-to-ground voltage; Maximum available phase-to-ground fault current; Duration in cycles as determined; Enter the arc gap in inches; Enter copper as the electrode material; Enter the default distance of 202 inches for “distance to the arc”
Once ARCPRO has been successfully ran is the incident energy level used to determine the PPE and FR clothing founded in Paragraph 6.5 needed?

Review Results (Section 6)

Does the TVA 1584 Calculator determine: Incident energy at the worker’s position for each bus, node, or potential point exposure; Distance from the arcing point to the arc flash protection boundary; Required PPE.
Does ARCPRO determine the following? Arc flash boundary; Incident energy.

Arc Flash Energy Reduction (Section 7)

Are the calculated incident energies reviewed for opportunities to reduce the higher values through electrical engineering changes to the circuits? Explanation: The responsible engineering staffs investigate possibilities to reduce the incident energy exposures through engineering changes, i.e., breaker trip setting, current limiting fuses, remote operation, robotics, remote voltage tests, etc.
Is work performed on electrical circuits with incident energy exposure at the worker’s position over 100 cal/cm2? Explanation: Incident energy exposures of this magnitude are reduced to 100 or less cal/cm2 by instituting engineering or administrative controls.
Are new electrical systems installations operating at 480 V or more designed to limit the incident energy exposure to less than 100 cal/cm2? Explanation: Major repair, renovation, or modification to existing electrical systems are also requires the incident energy exposures to be evaluated by electrical engineering with the objective of lowering the exposures to the lowest value possible.

Electrical Equipment Preventive Maintenance (Section 8)

Are the electrical circuit’s primary protective device parameters correctly specified, installed, and maintained? Explanation: The results of the arc flash hazard analysis are based on the electrical circuit’s primary protective device operating as designed and constructed. If the device fails to operate as designed, constructed, and set; higher incident energy can result and the specified PPE may not be adequate to protect the employee from second-degree burns. Preventive maintenance must be performed on protective devices.

Electrical System Configuration Control (Section 9)

Is the arc flash hazard analysis included in the organization’s configuration control management system?
Is the arc flash incident energy re-calculated if any of the following parameters change? Maximum available fault currents; Protective device clearing times; Distance from the worker to the arcing point; Bus and equipment configuration; Modes of operation that would change the above.
Are arc flash hazard analyses maintained and available for review by internal and external auditors?

Arc Flash Required Protection (Section 10)

Do employees (TVA, contractor, or manufacturer rep) wear FR clothing/PPE and are arc flash protection boundaries established in accordance to the arc flash hazard analysis? Explanation: Table 3 “Work Requiring Arc Flash Protection”
When establishing an arc flash boundary is the full distance of the boundary identified/marked to prohibit entry of persons without appropriate arc flash protection?
Does management identify employees who work on or near exposed, energized power circuits and equipment operating at 480 V or above?
Is daily-wear FR clothing rated according to ATPV? Long sleeve - 4.2 cal/cm2 T-shirt - 5 cal/cm2; Pants/coveralls - 6 cal/cm2
Is FR clothing provided by checkout or similar means for employees not required to wear daily-wear FR?
Is cold weather out garments or C-zone clothing FR?
Is Table A-1 Arc Flash Personal Protective Equipment used to select FR clothing and PPE for exposures greater than 4.2 cal/cm2?
Are arc flash protective hoods used for exposures greater than 8 cal/cm2?
Are warning signs posted on electrical switchgear, panel, motor control center cabinets, and other areas where employees are potentially exposed to an arc flash hazard? Explanation: The sign specifies the arc flash protection boundary distance, the arc flash incident energy at the work location, the level of FR clothing and PPE , voltage level, Minimum Approach Distance, and the equipment identity. To ensure consistency in signage, place orders for signs with TVA Corporate Signage at corporate_signage@tva.gov.
Are clothing including undergarments made of synthetic or blends of synthetic fabrics prohibit within the arc flash protection boundary? Explanation Approved FR clothing may be constructed of synthetic materials e.g., Ultra Soft Indura material.
Is rainwear arc flash rated? Explanation: When rainwear is needed to perform a task within an arc flash boundary it is to be arc flash rated.
Are face shields designed for arc flash hazard protection? Explanation: Do not use a non-arc rated polycarbonate face shield that is primarily designed for protection against projectile impact and is not capable of providing adequate arc flash hazard protection.
Is a Job Safety Analysis developed for working on exposed energized parts (480 V and above)? Explanation: The JSA is to be reviewed by employees prior to starting work.
Is an arc flash boundary established prior to opening energized arc-resistant switchgear? Explanation: “Arc-resistant switchgear” is designed and installed to prevent employee exposure to arc flash hazards when it is sealed / closed. When performing actions/operations on sealed/closed arc-resistant switchgear, an arc flash protection boundary is not required to be established.

Care of FR Clothing (Section 11)

Is FR clothing inspected at least weekly for cleanliness and defects? Explanation: Inspect for tears or holes in the garment.
Do employees launder their daily-wear FR in accordance to Appendix E “Care and Cleaning of TVA FR Garments”?
Are employees provided instructions about proper care and cleaning of FR garments? Explanation: Organizations may document that employees have been provided with these instructions using ATIS 00059192.

Training (Section 12)

Is training required for TVA employees, staff augmentation contract employees and contractor employees who: Potentially exposed to arc flashes; Authorized to perform the activities listed in Table 3; Authorized to work on exposed energized parts.
Have TVA employee and staff augmentation contractor employees received the proper training? Explanation: ATIS 00059114 “Arc Flash Hazard Calculation & Required Protection”
Are contract employees trained on arc flash hazards? Explanation: At a minimum, arc flash training must include: Arc flash hazard; Configuration change control of the electrical system; FR Clothing and PPE requirements; FR clothing use and care.
Are engineers and technical employees responsible for performing arc flash hazard analysis properly training? Explanation: Engineers and technical employees responsible for performing arc flash hazard analysis must be trained on TSP 1022.