Arc Flash Analysis QA 09 5.13.13.pdf

Arc-Flash Hazard Analysis With

Short-Circuit Analysis and Overcurrent Protective Device Coordination Analysis

For Federal Aviation Administration

Oklahoma City, OK General Thomas P Stafford Building (TPS)

Revision 1: 5/13/2013

Accomplished By

Lewellyn Technology P.O. Box 618

Linton, Indiana 47441 800-242-6673

812-847-3535 fax www.lewellyn.com

Electrical Engineer: Eric McCall Field Technicians: Eric McCall and Brad Wiley

Professional Engineer: Chris Guffey, P.E.

Revision 1 Report Prepared: May 13, 2013 Original Report Prepared: December 4, 2012

Data Collection Performed: August 12 http://www.lewellyn.com/�

Updates/Revisions

Revision 1 (5/13/13): This revision modified the original report to exclude protective devices that failed the device evaluation from the arc flash analysis. This was to ensure that the arc flash analysis was based on a protective device that has a sufficient rating that would result in accurate trip times. Any device that had an inadequate interrupt rating was excluded from the arc flash analysis so that the next upstream device, if it was also not failing, was used to clear the fault for the arc flash analysis. In some cases, there were three failed devices in series which resulted in the maximum trip time of 2 seconds.

It should be noted that the arc flash table may still show the first upstream device (the one that failed the device evaluation), this is a result of the maximum 2 second trip time being reached and the program defaulting to the first upstream device for reporting purposes.

So even though the table shows the upstream device as the protective device, the 2 second trip time should be noted and the note code N21 will no longer be indicated next to the Category rating. For a complete list of devices that have an inadequate interrupt rating, please refer so Section 3.A of this report.

05/13/13

Executive Summary

This report presents the results of short circuit calculations, protective device coordination, and arc-flash hazard calculations at the major electrical buses in the FAA Oklahoma City – TPS facility. T he scope of the study is to verify the interrupting ratings of the equipment in the distribution system are adequate for the available short circuit current and to determine the settings for the breakers to achieve optimum coordination while minimizing the arc-flash category ratings of the equipment. All calculations were done using the PTW software package supplied by SKM Systems Analysis, Inc.

Two of the “Dangerous” hazards found in this facility were found at the first panel or disconnect directly downstream from the utility transformer. R ecommendations to reduce the arc-flash hazard ratings at these panels were not researched, due to the fact that this part of the system is being protected by utility owned equipment.

A large portion of the hazards in this building are the result of approximately thirty 480V/208V transformers. If possible, the instantaneous setting of the upstream protective device was adjusted to reduce the PPE requirements. However, a majority of the existing protective devices in this building are fixed thermal magnetic circuit breakers. These hazards could only be reduced by replacing the existing protective devices as outlined in Section 3.A. A lthough these recommendations may not be very cost effective, this is the only option Lewellyn Technology had available to reduce the arc-flash hazard ratings.

The following table provides a breakdown of the number of hazard risk categories that are available within the system. Lewellyn Technology will review all hazards Category 2 and above and attempt to provide a recommendation to reduce these hazards in Section 3. The complete list of all of the equipment hazard risk categories can be found in Section 7.

Table Hazard Risk Category Summary Hazard Risk Category Number of Busses % of System Category 0 132 38% Category 1 54 15% Category 2 21 6% Category 3 120 34% Category 4 21 6% “Dangerous” 3 < 1% Total: 351 100%

The equipment evaluation found that there was equipment within the system that does not have an adequate interrupting rating based on the calculated values found in the analysis. In addition there is also equipment within the system that has a marginal value, meaning that the calculated fault current is within 90% of the interrupting rating of the device. Section 3.C will list all of the failed devices with the calculated fault current for the given device.

Table Equipment Evaluation Summary Device

Failure Type

Bus / Panel List Fail BUSWAY 2 1L, BUSWAY 2 D10R, BUSWAY 2 D12R, BUSWAY 2 D13R, BUSWAY 2 D2R, BUSWAY 2 D3L, BUSWAY 2 D4R, BUSWAY 2 U6R, BUSWAY 2 U7L, BUSWAY 2 U8R, BUSWAY 2 U9L, MCC B, MCC-A, PNL 1E4A, PNL 1E4B, PNL 1E4I, PNL 1N4B, PNL 1N4C, PNL 1N4H, PNL 1N4I, PNL 1N4J, PNL 1N4K, PNL 2N4A, PNL 2N4D, PNL 2N4E, PNL 2N4F, PNL 2N4G, PNL BN4A, PNL BN4B, PNL BN4C, PNL BN4D

Marginal BUSWAY 1 D1L, BUSWAY 1 D2R, BUSWAY 1 D3L, BUSWAY 1 D4R, BUSWAY 1 D8L, BUSWAY 1 D9R, BUSWAY 1 U6R, BUSWAY 1 U7L, BUSWAY 1 U8R, BUSWAY 1 U9L, PNL 1N2I, PNL 1N4F, PNL 1U4AA, PNL 1U4D, PNL 2N4B, PNL BN2AA1, PNL BN2AA11, PNL BN2W1-B, SWBD 1N4G

Table of Contents

Section Page

1. Introduction

2. Utility & Assumptions

3. Findings & Recommendations

4. Input Data

5. Summary of Calculated Fault Currents

6. Coordination Curves and Device Settings

7. Table of Calculated Arc-Flash Data

8. Single-Line Drawings

9. Appendix

10. Professional Services Contract…….…………………...…………………379

1. Introduction

This report presents the results of short circuit calculations, protective device coordination, and arc-flash hazard calculations at the major electrical buses in the FAA Oklahoma City – TPS facility. The scope of the study is to verify the interrupting ratings of the equipment in the distribution system are adequate for the available short circuit current and to determine the settings for the breakers to achieve optimum coordination while minimizing the arc-flash category ratings of the equipment. All calculations were done using the PTW software package supplied by SKM Systems Analysis, Inc.

Section 2 of this report outlines the information used to generate the results of this report.

This section will outline any assumptions that had to be made about the utility data provided or of any of the devices used within the study. Sometimes the specific settings for the devices cannot be determined in the field due to location, worn labels, or because of a digital interface. In these instances Lewellyn Technology will assume settings for the purposes of the report and then direct the customer to verify the settings for these particular devices. This section will also outline any equipment which we were unable to collect data along with a brief description explaining the reason the data was not collected.

Section 3 of this report presents findings describing dangerous or disruptive conditions within the facility. Arc-flash hazards are calculated using the algorithms specified by IEEE Standard 1584. The calculated arc-flash hazards are compared to the criteria in NFPA Standard 70E, and hazards requiring personal protective equipment (PPE) greater than Category 1 are reported. Recommendations for correcting the findings reported are then presented for each hazard found within the system. The largest overcurrent protective devices are analyzed for system coordination, and any undesirable conditions are reported along with recommendations for correcting the situation. Each overcurrent protective device included in the facility model is evaluated for adequate short circuit interrupting capability. Devices having insufficient interrupting capability are a safety hazard and are reported. All recommendations presume the protective devices have been well and properly maintained to operate in accordance with the manufacturer’s specifications.

Section 4 contains tabulated input data for the utility, generators, transformers, motors, and conductors. T his information represents the data collected and utilized for the calculated results found within this report.

Section 5 presents a summary of the calculated fault currents at every major bus modeled in the computer program. The three-phase to ground and single-phase to ground currents are reported. These two currents typically bracket the other possible fault currents and represent the worst case scenario, and thus are sufficient for the analyses done for this report.

Section 6 presents the time-current coordination curves for the largest overcurrent protective devices, and the tabulated settings for those devices. The curves present a graphical representation of the device characteristics. The relative positions between and/or among the protective devices indicates the coordination. Coordination implies the protective device closest to the fault reacts first to isolate the faulted part of the system from the remainder of the system.

Section 7 presents the calculated arc-flash energies and PPE categories as found in the arc-flash analysis. C alculated NFPA 70E protection levels are also described in this section. Labels indicating the arc-flash hazard conditions as listed in Section 7 are being provided with this report.

Section 8 presents the single-line drawings of the plant electrical distribution system.

These drawings provide the graphical user interface to the computer program as well as a record of the system topology. The calculated available fault currents for major buses, cable data, transformer data, and overcurrent protective device data are shown on t he drawings included in this report. The same data is also shown on l arger drawings that included on the accompanying compact disc.

The Appendix presents the supplementary information provided by the owner. This information will include the utility data as provided by the utility for the facility and any supplementary information provided by the Customer for information requested by Lewellyn Technology at the time of data collection or during the preparation of the report.

The report is also provided with a CD that will include PDF versions of the report and single line drawings of the system. In addition the CD will include .dxf version of the drawings shown in the PDF and an Excel file containing the arc-flash table for the Customer’s use.

2. Utility, Assumptions & Comments

A. The utility data for this report was provided by the utility OG & E. A copy of this information can be seen in the Appendix. In addition to the utility feed, this building is equipped with a back-up generator. In the PPE table and in Section 3, ( S0) designates an incident energy that is higher during normal operation and (S1) designates an incident energy that is higher during emergency operation. The worst case scenario is used in the tables and for recommendations.

This utility data is current as of the writing of this report. Any future changes within the utility system could affect the arc-flash results presented herein. These changes can be done by the utility at any time and often are done without any knowledge to the owner unless the change directly affects the customer’s facility. Since these types of changes cannot be foreseen or predicted Lewellyn Technology is not responsible for any arc-flash ratings affected by utility system changes. This utility information along with the data collected onsite has been used to construct a model of the facility for the arc-flash analysis. In addition, the 2012 version of NFPA70E, 130.3 s tates that:

“The arc-flash hazard analysis shall be updated when a major modification or renovation takes place. It shall be reviewed periodically, not to exceed five years, to account for changes in the electrical distribution system that could affect the results of the arc-flash hazard analysis.”

B. In some cases, a portion of the information may not have been available for the following equipment. In these instances estimates were made based on engineering judgment and a knowledge of “typical” values:

i. CHILLER, on DRAWING 16 – The size of this motor could not be determined during the on-site data collection. The size was assumed to be 250 HP based on the amperage of the upstream protective device.

C. The following equipment contained multiple fuse models for one equipment load. Lewellyn Technology assumed one model of fuse for each load as the software does not allow modeling of separate fuse models per phase. It is important to note that with multiple fuse models the arc flash findings found herein may not be accurate as each arc flash level was determined by analyzing with one fuse model for the given load. Customer should replace the odd fuse with the one assumed below to ensure the accuracy of the labels provided for the equipment.

i. ELEVATOR 4 DSC FS, on Drawing 15, contains two 70A model ECS fuses and one 70A model FRS-R fuse. Assumed model ECS fuses for the purpose of this report.

D. Circuit breaker PNL 1E4A CB1, on DRAWING 7, is rated for operation at 240V and is being used in a panel that is rated for 480V. T he customer should consider replacing this breaker with a properly rated protective device.

E. There are a l arge number of protective devices that appear to have inadequate interrupting capacity in this building. L ewellyn Technology researched for series ratings for these protective devices but was unable to find any series ratings that apply to the failing devices in question. If the customer can provide series rating information for these protective devices, Lewellyn Technology can re-evaluate these devices at that time.

3. Findings & Recommendations

WARNING

The PPE requirements when working on the line side of main disconnects, bus work and cabling between main transformers and main disconnects, and the connections within main transformers are not affected by the recommendations made in this report. That part of the system is protected by devices on the primary side of the transformers that are normally owned and set by the utility.

The primary side of the main breaker or main equipment for the facility is dictated with a bus named “Line Side” in the description as seen on the single line drawings. The primary or line side of these devices will often be considered “Dangerous”, unless otherwise noted.

A. This section outlines the equipment within the system that has a category rating of

Category 2 or above. Immediately following is a recommendation to lower the category rating of the equipment if one exists. T hese recommendations will not negatively affect the coordination unless otherwise noted. Lewellyn Technology will attempt to lower the category ratings by adjusting breaker settings whenever possible;

however, adjusting the breaker settings is not always an option. In some cases Lewellyn Technology will recommend a f aster acting fuse to replace the current model of fuse being used. The customer should verify with the equipment manufacturer that the particular fuse recommendation is compatible with the equipment within which it is to be installed. It is also important to use the exact manufacturer and model of fuse as a similar fuse from another manufacturer may not have the same curve characteristics as the one indicated in the recommendation and could result in different category ratings than those outlined in this report.

In other cases, only a different characteristic curve type (different circuit breaker model) will change the category rating. T his may require a breaker with a f aster acting instantaneous trip or replacing the breaker with discrete LI or LSI functions.

In these instances Lewellyn Technology will try to select a b reaker from the same manufacturer as the other breakers in the equipment to illustrate that the category rating can be reduced with a breaker that has similar characteristics and settings to the one shown. Due to the vast number of equipment types, manufacturers, and model numbers Lewellyn Technology cannot guarantee that the particular breaker chosen will be compatible with the equipment. The customer should note that the actual level that can be achieved in the customer’s equipment will be dependent on w hat make and model of breaker(s) are compatible with that equipment and may not necessarily achieve a level as low as what was shown in the report example. It is the customer’s responsibility to consult their local equipment representative to determine what breakers are compatible with each piece of equipment.

(Long Time Pickup – LTPU, Long Time Delay - LTD, Short Time Pick Up – STPU, Short Time Delay – STD, and Instantaneous – INST)

Arc Flash Recommendations The TCC name after each recommendation in parenthesis, references either the TCC name that the recommended protective device can be seen in or an equivalent device with similar upstream and downstream devices.

1. Bus PNL 1N2AA (PNL 1N2AA MN CB LineSide), fed from XFMR T-32 on DRAWING 13, is considered “Dangerous” (S0).

Replace circuit breaker BUSWAY 2 1L CB with an electronic trip breaker having an LSI tripping unit and an interrupt rating greater than 42,950 amperes. Lewellyn Technology tried a 400A GE model FGN Record Plus electronic trip breaker with the following settings: LTPU "400", LTD "10", STPU "5X", STD "0.12", i2t "Out", and an instantaneous trip of "11X" (4,400 amperes). This circuit breaker has an interrupt rating of 65 kA. This change will reduce the arc-flash hazard at bus PNL 1N2AA (PNL 1N2AA MN CB LineSide) from “Dangerous” to a PPE requirement of Category 2.

Appropriate PPE must be worn when working on e nergized equipment.

Please note that this hazard could be reduced further by reducing the settings of the recommended breaker but will not allow for the in-rush current of XFMR T-32. ( TCC BUSWAY 2 to PNL 1N2AA) It is the customer's responsibility to consult their local equipment representative to determine what protective devices are compatible with each piece of equipment; see paragraph 3.A above.

2. Bus SWBD MSWB 1A (SWBD MAIN 1A LineSide), fed from XF #38 on

DRAWING 1, is considered “Dangerous” (S0).

Lewellyn Technology is unable to provide a recommendation to reduce the arc-flash hazard at bus SWBD MSWB 1A (SWBD MAIN 1A LineSide). It is the first bus downstream from utility transformer XF #38, a nd the upstream protective device is owned by the utility. It is considered “Dangerous” and energized work must not be performed. (TCC XF #38 to

SWBD MSWB 1A)

3. Bus SWBD MSWB 1B (SWBD MAIN 1B LineSide), fed from XF #39 on

DRAWING 1, is considered “Dangerous” (S0).

arc-flash hazard at bus SWBD MSWB 1B (SWBD MAIN 1B LineSide). It is the first bus downstream from utility transformer XF #39, a nd the upstream protective device is owned by the utility. It is considered “Dangerous” and energized work must not be performed. (TCC XF #39 to

SWBD MSWB 1B)

4. Bus BYPASS PNL, fed from UPS on DRAWING 6, is Category 4 (S1).

Reset the instantaneous setting of circuit breakers SWBD 1E4C CBD3 and SWBD 1E4C CBD3 to "2". This change will reduce the PPE requirement at bus BYPASS PNL from Category 4 to Category 1. P lease note however, this change will cause undesirable coordination with downstream protective devices. To improve coordination with downstream protective devices, implement the following recommendations: 1) Reset the instantaneous setting of circuit breakers PNL 1U4AA CB1 and PNL 1U4AA CB2 to "7" (2,800 amperes). 2) Reset the instantaneous setting of circuit breakers BYPASS PNL CB1 and BYPASS PNL CB2 to "5" (4,000 amperes). 3) Reset the instantaneous setting of circuit breaker PNL 1U4D MN CB to "6" (3,150 amperes). 4) Reset the instantaneous setting of circuit breaker PNL 1U4D CB1 to "5" (1,750 amperes). A ny further reduction in these instantaneous settings may not allow for the full in-rush current of transformer XFMR T-15. (TCC's PNL 1U4AA to PNL 1U4D and SWBD 1E4C to PNL 1U4AA)

5. Bus ELEVATOR 4 DSC, fed from PNL BN4B on DRAWING 15, is

Category 4 (S0).

This hazard is the result of an upstream protective device that has an insufficient interrupting rating. R eplace circuit breaker PNL BN4B CB1 with a breaker having an interrupt rating greater than 38,420 amperes.

Lewellyn Technology tried a 100A GE model TEYL breaker that has an interrupt rating of 65 kA. This change will reduce the PPE requirement at bus ELEVATOR 4 DSC from Category 4 to Category 0. (TCC PNL BN4B to ELEVATOR 4 CP) It is the customer's responsibility to consult their local equipment representative to determine what protective devices are compatible with each piece of equipment; see paragraph 3.A above.

6. Bus EM GEN DSC, fed from EM GEN on DRAWING 2, is Category 4

(S0).

PPE requirement at bus EM GEN DSC. It is the first bus downstream from a generator. It is Category 4, a nd appropriate PPE must be worn when working on energized equipment. (TCC EM GEN DSC to SWBD 1E4C)

7. Bus LIEBERT #17, fed from PNL 2N4E on DRAWING 16, is Category 4 (S0).

insufficient interrupting rating. R eplace circuit breaker PNL 2N4E CB19 with a breaker having an interrupt rating greater than 36,085 amperes.

Lewellyn Technology tried a 60A GE model TEYL breaker that has an interrupt rating of 65 kA. This change will reduce the PPE requirement at bus LIEBERT #17 from Category 4 to Category 0. (TCC BUSWAY 2 to PNL 2N4E) It is the customer's responsibility to consult their local equipment representative to determine what protective devices are

8. Bus LIEBERT #18, fed from PNL 2N4E on DRAWING 16, is Category insufficient interrupting rating. R eplace circuit breaker PNL 2N4E CB25 with a breaker having an interrupt rating greater than 36,085 amperes.

Lewellyn Technology tried a 60A GE model TEYL breaker that has an interrupt rating of 65 kA. This change will reduce the PPE requirement at bus LIEBERT #18 f rom Category 4 t o Category 0. It is the customer's responsibility to consult their local equipment representative to determine

9. Bus M-VENT FAN DSC BN4B, fed from PNL BN4B on DRAWING 15, is Category 4 (S0).

insufficient interrupting rating. R eplace circuit breaker PNL BN4B CB2 with a breaker having an interrupt rating greater than 38,420 amperes.

Lewellyn Technology tried a 20A GE model TEYL that has an interrupt rating of 65 k A. T his change will reduce the PPE requirement at bus M- VENT FAN DSC BN4B from Category 4 t o Category 0. It is the customer's responsibility to consult their local equipment representative to determine what protective devices are compatible with each piece of equipment; see paragraph 3.A above.

10. Bus PNL 1E4A, fed from SWBD 1E4C on DRAWING 6, is Category 4

(S1).

Reset the instantaneous setting of circuit breaker SWBD 1E4C CBB3 to "3".

This change will reduce the PPE requirement at bus PNL 1E4A from Category 4 to Category 1. P lease note however, this change will cause undesirable coordination with downstream protective device PNL 1E4A CB1. (TCC SWBD 1E4C to PNL 1E4A)

11. Bus PNL 1E4B, fed from PNL 1E4A on DRAWING 7, is Category 4 insufficient voltage rating. Replace circuit breaker PNL 1E4A CB1 with a breaker having an adjustable instantaneous tripping unit and is rated for 480V. Lewellyn Technology tried a 300A GE model TJJ breaker with the instantaneous set to "5" (1,500 amperes). This change will reduce the PPE requirement at bus PNL 1E4B from Category 4 to Category 0. (TCC SWBD 1E4C to PNL 1E4A) It is the customer's responsibility to consult their

12. Bus PNL 1EU2A (PNL 1EU2A MN CB LineSide), fed from XFMR T-34 on DRAWING 9, is Category 4 (S0).

Reset the instantaneous setting of circuit breaker PNL 1U4D CB2 to "4" (1,000 amperes). This change will reduce the PPE requirement at bus PNL 1EU2A (PNL 1EU2A MN CB LineSide) from Category 4 t o Category 0.

This change however, might affect the operation of transformer XFMR T-34 by not allowing for the full inrush current. ( TCC PNL 1U4D to PNL

1EU2A)

13. Bus PNL 1U4AA, fed from SWBD 1E4C on DRAWING 6, is Category 4

Implement recommendation A.4 for protective device SWBD 1E4C CBD3.

This change will reduce the PPE requirement at bus PNL 1U4AA from Category 4 to Category 1.

14. Bus PNL 1U4D (PNL 1U4D MN CB LineSide), fed from PNL 1U4AA on

DRAWING 6, is Category 4 (S1).

Implement recommendation A.4 for protective device PNL 1U4AA CB1.

This change will reduce the PPE requirement at bus PNL 1U4D (PNL 1U4D MN CB LineSide) from Category 4 to Category 0.

15. Bus PNL 2N2L (PNL 2N2L MN CB LineSide), fed from XFMR T-24 on

DRAWING 13, is Category 4 (S0).

Replace circuit breaker BUSWAY 2 U7L CB with an electronic trip breaker having an LSI tripping unit. Lewellyn Technology tried a 600A GE model FGN Record Plus electronic trip breaker with the following settings: LTPU "600", LTD "1.25", STPU "2X", STD "0.12", i2t "Out", and an instantaneous trip of "6X" (3,600 amperes). This change will reduce the PPE requirement at bus PNL 2N2L (PNL 2N2L MN CB LineSide) from Category 4 to Category 1. It is the customer's responsibility to consult their local

16. Bus PNL BN2A (PNL BN2A MN CB LineSide), fed from XFMR T-11 on DRAWING 13, is Category 4 (S0).

Replace circuit breaker BUSWAY 2 D13R CB with an electronic trip breaker having an LSI tripping unit. Lewellyn Technology tried a 600A GE model FGN Record Plus electronic trip breaker with the following settings:

LTPU "600", LTD "1.25", STPU "2X", STD "0.12", i2t "Out", and an instantaneous trip of "6X" (3,600 amperes). T his change will reduce the PPE requirement at bus PNL BN2A (PNL BN2A MN CB LineSide) from Category 4 to Category 1. It is the customer's responsibility to consult their

17. Bus PNL BN2C-1 (PNL BN2C-1 MN CB LineSide), fed from XFMR T-

13 on DRAWING 13, is Category 4 (S0).

Replace circuit breaker BUSWAY 2 D8L CB with an electronic trip breaker having an LSI tripping unit. Lewellyn Technology tried an 800A GE model TP, MVT Plus/PM electronic trip breaker with the following settings: LTPU "1", LTD "1", STPU "2", STD "Int", i2t "Out", and an instantaneous trip of "6" (4,800 amperes). This change will reduce the PPE requirement at bus PNL BN2C-1 (PNL BN2C-1 MN CB LineSide) from Category 4 t o Category 2. A ppropriate PPE must be worn when working on e nergized equipment. T he STD could be adjusted to "Min" to achieve a PPE requirement of Category 1 but might affect the operation of transformer XFMR T-13 by not allowing for the full inrush current. (TCC BUSWAY 2 to PNL BN2C-1) It is the customer's responsibility to consult their local

18. Bus PNL BN2C-2, fed from PNL BN2C-1 on DRAWING 14, is Category

Reset the instantaneous setting of circuit breaker PNL BN2C-1 MN CB to "4" (4,000 amperes). This change will reduce the PPE requirement at bus PNL BN2C-2 from Category 4 to Category 1. (TCC BUSWAY 2 to PNL

BN2C-1)

19. Bus PNL BN2J1 (PNL BN2J1 MN CB LineSide), fed from XFMR T-14 on DRAWING 3, is Category 4 (S0).

Replace circuit breaker BUSWAY 1 D10L CB with an electronic trip breaker having an LSI tripping unit. L ewellyn Technology tried an 800A GE model TP, MVT Plus/PM electronic trip breaker with the following settings: LTPU "1", LTD "1", STPU "2", STD "Int", i2t "Out", and an instantaneous trip of "6" (4,800 amperes). This change will reduce the PPE requirement at bus PNL BN2J1 (PNL BN2J1 MN CB LineSide) from Category 4 to Category 2. Appropriate PPE must be worn when working on energized equipment. The STD could be adjusted to "Min" to achieve a PPE requirement of Category 1 but might affect the operation of transformer XFMR T-14 by not allowing for the full inrush current. (TCC BUSWAY 1 to PNL BN2J1) It is the customer's responsibility to consult their local

20. Bus PNL BU2B-1 (PNL BU2B-1 MN CB LineSide), fed from XFMR T-

12 on DRAWING 6, is Category 4 (S0).

Replace circuit breaker PNL 1U4AA CB2 with an electronic trip breaker having an LSI tripping unit. L ewellyn Technology tried a 400A Cutler- Hammer model CKD, RMS 310 e lectronic trip breaker with the following settings: LTPU "400A", LTD "Fixed", STPU "2", STD "200 ms", i2t "Out", and an instantaneous trip of "Fixed" (4,000 amperes). T his change will reduce the PPE requirement at bus PNL BU2B-1 (PNL BU2B-1 MN CB LineSide) from Category 4 to Category 1. Please note however, this change will cause undesirable coordination with downstream protective devices.

(TCC PNL 1U4AA to PNL BU2B-1) It is the customer's responsibility to consult their local equipment representative to determine what protective devices are compatible with each piece of equipment; see paragraph 3.A above.

21. Bus PNL BU2B-2, fed from PNL BU2B-1 on DRAWING 6, is Category

Reset the instantaneous setting of circuit breaker PNL BU2B-1 MN CB to "3" (3,000 amperes). This change will reduce the PPE requirement at bus PNL BU2B-2 from Category 4 t o Category 1. Please note however, this change will cause undesirable coordination with downstream protective devices. (TCC PNL 1U4AA to PNL BU2B-1)

22. Bus SWBD 1E4C (SWBD 1E4C MAIN CB LineSide), fed from SWBD 1E4C ATS on DRAWING 2, is Category 4 (S1).

Reset the tripping unit of circuit breaker EM GEN DSC CB to the following settings: LTPU "1.1", LTD "1", and an instantaneous trip of "2" (3,200 amperes). This change will reduce the PPE requirement at bus SWBD 1E4C (SWBD 1E4C MAIN CB LineSide) from Category 4 to Category 1. ( TCC EM GEN DSC to SWBD 1E4C)

23. Bus SWBD 1E4C ATS, fed from EM GEN DSC on DRAWING 2, is

Category 4 (S1).

Implement recommendation A.22 for protective device EM GEN DSC CB.

This change will reduce the PPE requirement at bus SWBD 1E4C ATS from Category 4 to Category 1.

24. Bus UPS, fed from SWBD 1E4C on DRAWING 6, is Category 4 (S1).

Implement recommendation A.4 for protective device SWBD 1E4C CBD3.

This change will reduce the PPE requirement at bus UPS from Category 4 to Category 1.

25. Bus 1N2D DSC, fed from XFMR T-6 on DRAWING 16, is Category 3

Reset the instantaneous setting of circuit breaker SWBD 1N4A S2 CB8 to "4" (1,000 amperes). This change will reduce the PPE requirement at bus 1N2D DSC from Category 3 to Category 0. This change however, might affect the operation of transformer XFMR T-6 by not allowing for the full inrush current. (TCC SWBD 1N4A S2 to PNL 1N2D)

26. Bus 213E UPS, fed from 213E UPS PNL on DRAWING 7, is Category 3

Reset the instantaneous setting of circuit breaker 2E2A DSC CB to "4" (1,000 amperes). This change will reduce the PPE requirement at bus 213E UPS from Category 3 to Category 0. (TCC 2E2A DSC to 213E UPS PNL)

27. Bus 213E UPS PNL, fed from 2E2A DSC on DRAWING 7, is Category

3 (S0).

Implement recommendation A.26 for protective device 2E2A DSC CB.

This change will reduce the PPE requirement at bus 213E UPS PNL from Category 3 to Category 0.

28. Bus 2E2A DSC, fed from XFMR T-8 on DRAWING 7, is Category 3

Replace circuit breaker PNL 1E4A CB7 with a breaker having an adjustable instantaneous tripping unit. Lewellyn Technology tried a 125A GE model TJJ breaker with the instantaneous set to "4" (500 amperes). T his change will reduce the PPE requirement at bus 2E2A DSC from Category 3 to Category 0. This change however, might affect the operation of transformer XFMR T-8 by not allowing for the full inrush current. (TCC PNL 1E4A to 2E2A DSC) It is the customer's responsibility to consult their local

29. Bus 2N2A DSC, fed from XFMR T-5 on DRAWING 17, is Category 3

Reset the instantaneous setting of circuit breaker PNL 1N4B CB2 to "4" (1,000 amperes). This change will reduce the PPE requirement at bus 2N2A DSC from Category 3 to Category 0. This change however, might affect the operation of transformer XFMR T-5 by not allowing for the full inrush current. (TCC PNL 1N4B to PNL 2N2A)

30. Bus 2N2E DSC, fed from XFMR T-4 on DRAWING 9, is Category 3

Reset the instantaneous setting of circuit breaker PNL 1U4D CB13 to "LO" (675 amperes). This change will reduce the PPE requirement at bus 2N2E DSC from Category 3 to Category 0. This change however, might affect the operation of transformer XFMR T-4 by not allowing for the full inrush current. (TCC PNL 1U4D to PNL 2N2E)

31. Bus AHU 1 VFD, fed from AHU 1 XFMR on DRAWING 18, is

Category 3 (S0).

Reset the instantaneous setting of circuit breaker MCC-A CBA4 to "6" (900 amperes). This change will reduce the PPE requirement at bus AHU 1 VFD from Category 3 t o Category 0. T his change however, might affect the operation of transformer AHU 1 XFMR by not allowing for the full inrush current. (TCC SWBD 1N4A to MCC-A)

32. Bus AIR COMP DSC, fed from PNL 1E4B on DRAWING 7, is insufficient interrupting rating. Replace circuit breaker PNL 1E4B CB26 with a breaker having an interrupt rating greater than 24,170 amperes.

Lewellyn Technology tried a 20A GE model TEYH breaker that has an interrupt rating of 35 kA. This change will reduce the PPE requirement at bus AIR COMP DSC from Category 3 to Category 0. It is the customer's responsibility to consult their local equipment representative to determine

33. Bus AIR HNDL UNIT 5 DSC, fed from MCC B on DRAWING 3, is insufficient interrupting rating. R eplace motor circuit protector MCC B CBB1 with a MCP that has an interrupt rating greater than 39,740 amperes.

Lewellyn Technology tried a 15A GE model TECL MCP with the instantaneous set to "8" (146 amperes) that has an interrupt rating of 100 kA.

This change will reduce the PPE requirement at bus AIR HNDL UNIT 5 DSC from Category 3 to Category 0. It is the customer's responsibility to consult their local equipment representative to determine what protective

34. Bus CLNG TWR FAN CHILL 4, fed from MCC B on DRAWING 3, is

Category 3 (S1).

insufficient interrupting rating. R eplace motor circuit protector MCC B CBC2 with a MCP that has an interrupt rating greater than 39,740 amperes.

Lewellyn Technology tried a 30A GE model TECL MCP with the instantaneous set to "6" (240 amperes) that has an interrupt rating of 100 kA.

This change will reduce the PPE requirement at bus CLNG TWR FAN CHILL 4 from Category 3 to Category 0. It is the customer's responsibility to consult their local equipment representative to determine what protective devices are compatible with each piece of equipment; see

35. Bus CND WTR PMP PP-5 DSC, fed from MCC-A on DRAWING 18, is insufficient interrupting rating. R eplace motor circuit protector MCC-A CBB2 with a MCP that has an interrupt rating greater than 31,290 amperes.

Lewellyn Technology tried a 50A GE model TECL MCP with the instantaneous set to "2" (260 amperes) that has an interrupt rating of 100 kA.

This change will reduce the PPE requirement at bus CND WTR PMP PP-5 DSC from Category 3 to Category 0. It is the customer's responsibility to consult their local equipment representative to determine what protective

36. Bus CND WTR PMP PP-6 DSC, fed from MCC-A on DRAWING 18, is

CBB3 with a MCP that has an interrupt rating greater than 31,290 amperes.

Lewellyn Technology tried a 50A GE model TECL MCP with the instantaneous set to "6" (420 amperes) that has an interrupt rating of 100 kA.

This change will reduce the PPE requirement at bus CND WTR PMP PP-6 DSC from Category 3 to Category 0. It is the customer's responsibility to consult their local equipment representative to determine what protective

37. Bus HTG WTR PMP PP-3 DSC, fed from MCC-A on DRAWING 18, is

CBA1 with a MCP that has an interrupt rating greater than 31,290 amperes.

Lewellyn Technology tried a 7A GE model TECL MCP with the instantaneous set to "4" (42 amperes) that has an interrupt rating of 100 kA.

This change will reduce the PPE requirement at bus HTG WTR PMP PP-3 DSC from Category 3 to Category 0. It is the customer's responsibility to consult their local equipment representative to determine what protective

38. Bus HTG WTR PMP PP-4 DSC, fed from MCC-A on DRAWING 18, is

CBA2 with a MCP that has an interrupt rating greater than 31,290 amperes.

Lewellyn Technology tried a 7A GE model TECL MCP with the instantaneous set to "4" (42 amperes) that has an interrupt rating of 100 kA.

This change will reduce the PPE requirement at bus HTG WTR PMP PP-4 DSC from Category 3 to Category 0. It is the customer's responsibility to consult their local equipment representative to determine what protective

39. Bus LIEBERT #4, fed from PNL 1E4B on DRAWING 7, is Category 3 insufficient interrupting rating. Replace circuit breaker PNL 1E4B CB20 with a breaker having an interrupt rating greater than 24,170 amperes.

Lewellyn Technology tried a 40A GE model TEYH breaker that has an interrupt rating of 35 kA. This change will reduce the PPE requirement at bus LIEBERT #4 from Category 3 to Category 0. It is the customer's responsibility to consult their local equipment representative to determine

40. Bus LIEBERT #5, fed from PNL 1E4B on DRAWING 7, is Category 3 insufficient interrupting rating. Replace circuit breaker PNL 1E4B CB25 with a breaker having an interrupt rating greater than 24,170 amperes.

Lewellyn Technology tried a 40A GE model TEYH breaker that has an interrupt rating of 35 kA. This change will reduce the PPE requirement at bus LIEBERT #5 from Category 3 to Category 0. It is the customer's responsibility to consult their local equipment representative to determine

41. Bus M-LIEBERT #1, fed from PNL BN4D on DRAWING 4, is Category 3 (S1).

insufficient interrupting rating. R eplace circuit breaker PNL BN4D CB11 with a breaker having an interrupt rating greater than 36,450 amperes.

Lewellyn Technology tried a 70A GE model TEYL breaker that has an interrupt rating of 65 kA. This change will reduce the PPE requirement at bus M-LIEBERT #1 from Category 3 t o Category 0. It is the customer's responsibility to consult their local equipment representative to determine

42. Bus M-LIEBERT #19, fed from PNL 2N4G on DRAWING 5, is insufficient interrupting rating. R eplace circuit breaker PNL 2N4G CB11 with a breaker having an interrupt rating greater than 33,250 amperes.

Lewellyn Technology tried a 30A GE model TEYH breaker that has an interrupt rating of 35 kA. This change will reduce the PPE requirement at bus M-LIEBERT #19 from Category 3 to Category 0. It is the customer's responsibility to consult their local equipment representative to determine

43. Bus M-LIEBERT #2, fed from PNL BN4D on DRAWING 4, is Category insufficient interrupting rating. R eplace circuit breaker PNL BN4D CB17 with a breaker having an interrupt rating greater than 36,450 amperes.

Lewellyn Technology tried a 70A GE model TEYL breaker that has an interrupt rating of 65 kA. This change will reduce the PPE requirement at bus M-LIEBERT #2 from Category 3 t o Category 0. It is the customer's responsibility to consult their local equipment representative to determine

44. Bus M-LIEBERT #20, fed from PNL 2N4G on DRAWING 5, is insufficient interrupting rating. R eplace circuit breaker PNL 2N4G CB17 with a breaker having an interrupt rating greater than 33,250 amperes.

Lewellyn Technology tried a 30A GE model TEYH breaker that has an interrupt rating of 35 kA. This change will reduce the PPE requirement at bus M-LIEBERT #20 from Category 3 to Category 0. It is the customer's responsibility to consult their local equipment representative to determine

45. Bus M-LIEBERT #3, fed from PNL BN4D on DRAWING 4, is Category insufficient interrupting rating. R eplace circuit breaker PNL BN4D CB23 with a breaker having an interrupt rating greater than 36,450 amperes.

Lewellyn Technology tried a 70A GE model TEYL breaker that has an interrupt rating of 65 kA. This change will reduce the PPE requirement at bus M-LIEBERT #3 from Category 3 t o Category 0. It is the customer's responsibility to consult their local equipment representative to determine

46. Bus M-LIEBERT #4, fed from PNL BN4D on DRAWING 4, is Category insufficient interrupting rating. R eplace circuit breaker PNL BN4D CB20 with a breaker having an interrupt rating greater than 36,450 amperes.

Lewellyn Technology tried a 70A GE model TEYL breaker that has an interrupt rating of 65 kA. This change will reduce the PPE requirement at bus M-LIEBERT #4 from Category 3 t o Category 0. It is the customer's responsibility to consult their local equipment representative to determine

47. Bus M-LIEBERT #5, fed from PNL BN4D on DRAWING 4, is Category insufficient interrupting rating. R eplace circuit breaker PNL BN4D CB14 with a breaker having an interrupt rating greater than 36,450 amperes.

Lewellyn Technology tried a 70A GE model TEYL breaker that has an interrupt rating of 65 kA. This change will reduce the PPE requirement at bus M-LIEBERT #5 from Category 3 t o Category 0. It is the customer's responsibility to consult their local equipment representative to determine

48. Bus M-VENT FAN DSC, fed from PNL 1N4K on DRAWING 4, is insufficient interrupting rating. R eplace circuit breaker PNL 1N4K CB3 with a breaker having an interrupt rating greater than 34,290 amperes.

Lewellyn Technology tried a 20A GE model TEYH breaker that has an interrupt rating of 35 kA. This change will reduce the PPE requirement at bus M-VENT FAN DSC from Category 3 t o Category 0. It is the customer's responsibility to consult their local equipment representative to

49. Bus M-VENT FAN DSC 1N4I, fed from PNL 1N4I on DRAWING 13, is insufficient interrupting rating. Replace circuit breaker PNL 1N4I CB2 with a breaker having an interrupt rating greater than 34,500 amperes. Lewellyn Technology tried a 20A GE model TEYH breaker that has an interrupt rating of 35 kA . T his change will reduce the PPE requirement at bus M-VENT FAN DSC 1N4I from Category 3 t o Category 0. It is the customer's responsibility to consult their local equipment representative to determine

50. Bus M-VENT FAN DSC 2N4E, fed from PNL 2N4E on DRAWING 16, is Category 3 (S1).

insufficient interrupting rating. Replace circuit breaker PNL 2N4E CB2 with a breaker having an interrupt rating greater than 36,085 amperes.

Lewellyn Technology tried a 20A GE model TEYL breaker that has an interrupt rating of 65 kA. This change will reduce the PPE requirement at bus M-VENT FAN DSC 2N4E from Category 3 to Category 0. It is the customer's responsibility to consult their local equipment representative to

51. Bus PDU CAB, fed from 213E UPS PNL on DRAWING 7, is Category 3

Implement recommendation A.26 for protective device 2E2A DSC CB.

This change will reduce the PPE requirement at bus PDU CAB from Category 3 to Category 0. (TCC 2E2A DSC to 213E UPS PNL)

52. Bus PHOTO CELL LT CNTCT1, fed from PNL 1N4H on DRAWING

13, is Category 3 (S0).

insufficient interrupting rating. R eplace circuit breaker PNL 1N4H CB28 with a breaker having an interrupt rating greater than 32,240 amperes.

Lewellyn Technology tried a 20A GE model TEYH breaker that has an interrupt rating of 35 kA. This change will reduce the PPE requirement at bus PHOTO CELL LT CNTCT1 from Category 3 to Category 0. It is the customer's responsibility to consult their local equipment representative to

53. Bus PNL 1E2A (PNL 1E2A MN CB LineSide), fed from XFMR T-3 on

DRAWING 7, is Category 3 (S0).

Replace circuit breaker PNL 1E4A CB8 with a breaker having an adjustable instantaneous tripping unit. Lewellyn Technology tried a 150A GE model TJJ breaker with the instantaneous set to "5" (750 amperes). T his change will reduce the PPE requirement at bus PNL 1E2A (PNL 1E2A MN CB LineSide) from Category 3 to Category 0. T his change however, might affect the operation of transformer XFMR T-3 by not allowing for the full inrush current. (TCC PNL 1E4A to PNL 1E2A) It is the customer's responsibility to consult their local equipment representative to determine

54. Bus PNL 1E2D (PNL 1E2D MN CB LineSide), fed from XFMR T-18 on DRAWING 8, is Category 3 (S0).

Replace circuit breaker PNL 1E4E CB1 with a breaker having an adjustable instantaneous tripping unit. Lewellyn Technology tried a 100A GE model SELA, Spectra RMS breaker with the instantaneous set to "3". This change will reduce the PPE requirement at bus PNL 1E2D (PNL 1E2D MN CB LineSide) from Category 3 to Category 1. T his change however, might affect the operation of transformer XFMR T-18 by not allowing for the full inrush current. ( TCC PNL 1E4E to PNL 1E2D) It is the customer's responsibility to consult their local equipment representative to determine

55. Bus PNL 1E2E (PNL 1E2E MN CB LineSide), fed from XFMR T-19 on

DRAWING 8, is Category 3 (S0).

Replace circuit breaker PNL 1E4F CB7 with a breaker having an adjustable instantaneous tripping unit. Lewellyn Technology tried a 100A GE model SELA, Spectra RMS breaker with the instantaneous set to "3". This change will reduce the PPE requirement at bus PNL 1E2E (PNL 1E2E MN CB LineSide) from Category 3 to Category 0. T his change however, might affect the operation of transformer XFMR T-19 by not allowing for the full inrush current. ( TCC PNL 1E4E to PNL 1E2D) It is the customer's responsibility to consult their local equipment representative to determine

56. Bus PNL 1EU2AA (PNL 1EU2AA MN CB LineSide), fed from XFMR

T-8 on DRAWING 7, is Category 3 (S0).

Implement recommendation A.28 for protective device PNL 1E4A CB7.

This change will reduce the PPE requirement at bus PNL 1EU2AA (PNL 1EU2AA MN CB LineSide) from Category 3 t o Category 0. (TCC PNL 1E4A to 2E2A DSC)

57. Bus PNL 1N2A (PNL 1N2A MN CB LineSide), fed from XFMR T-1 on

DRAWING 16, is Category 3 (S0).

Replace circuit breaker PNL 1N4D CB0 with a breaker having an adjustable

TJJ breaker with the instantaneous set to "5" (750 amperes). T his change will reduce the PPE requirement at bus PNL 1N2A (PNL 1N2A MN CB LineSide) from Category 3 to Category 0. T his change however, might affect the operation of transformer XFMR T-1 by not allowing for the full inrush current. (TCC SWBD 1N4A to PNL 1N2A) It is the customer's responsibility to consult their local equipment representative to determine

58. Bus PNL 1N2A1 (PNL 1N2A1 MN CB LineSide), fed from PNL 1N2R on DRAWING 3, is Category 3 (S1).

Replace circuit breaker PNL 1N2R CB8 with a breaker having an adjustable

THFK breaker with the instantaneous set to "10" (1,250 amperes). T his change will reduce the PPE requirement at bus PNL 1N2A1 (PNL 1N2A1 MN CB LineSide) from Category 3 to Category 0. (TCC PNL 1N2R to PNL 1N2A1) It is the customer's responsibility to consult their local equipment representative to determine what protective devices are compatible with each piece of equipment; see paragraph 3.A above.

59. Bus PNL 1N2B (PNL 1N2B MN CB LineSide), fed from XFMR T-2 on

Replace circuit breaker PNL 1N4D CB43 with a b reaker having an adjustable instantaneous tripping unit. Lewellyn Technology tried a 150A GE model TJJ breaker with the instantaneous set to "5" (750 amperes). This change will reduce the PPE requirement at bus PNL 1N2B (PNL 1N2B MN CB LineSide) from Category 3 to Category 0. T his change however, might affect the operation of transformer XFMR T-2 by not allowing for the full inrush current. ( TCC PNL 1N4E to PNL 1N2B) It is the customer's responsibility to consult their local equipment representative to determine

60. Bus PNL 1N2C (PNL 1N2C MN CB LineSide), fed from XFMR T-7 on

Reset the instantaneous setting of circuit breaker SWBD 1N4A S1 CB8 to "5" (750 amperes). This change will reduce the PPE requirement at bus PNL 1N2C (PNL 1N2C MN CB LineSide) from Category 3 to Category 0. This change however, might affect the operation of transformer XFMR T-7 by not allowing for the full inrush current. ( TCC SWBD 1N4A S1 to PNL 1N2C)

61. Bus PNL 1N2E, fed from PNL1N2D on DRAWING 16, is Category 3

Replace circuit breaker PNL 1N2D CB2 with a breaker having an adjustable

TFJ breaker with the instantaneous set to "10" (1,250 amperes). This change will reduce the PPE requirement at bus PNL 1N2E from Category 3 to Category 0. ( TCC 1N2D DSC to PNL 1N2E) It is the customer's responsibility to consult their local equipment representative to determine

62. Bus PNL 1N2F, fed from PNL1N2D on DRAWING 16, is Category 3

Replace circuit breaker PNL 1N2D CB7 with a breaker having an adjustable

TFJ breaker with the instantaneous set to "10" (1,250 amperes). This change will reduce the PPE requirement at bus PNL 1N2F from Category 3 to Category 0. ( TCC 1N2D DSC to PNL 1N2E) It is the customer's responsibility to consult their local equipment representative to determine

63. Bus PNL 1N2G, fed from PNL1N2D on DRAWING 16, is Category 3

Replace circuit breaker PNL 1N2D CB1 with a breaker having an adjustable

TFJ breaker with the instantaneous set to "10" (1,250 amperes). This change will reduce the PPE requirement at bus PNL 1N2G from Category 3 to Category 0. ( TCC 1N2D DSC to PNL 1N2E) It is the customer's responsibility to consult their local equipment representative to determine

64. Bus PNL 1N2H (PNL 1N2H MN CB LineSide), fed from XFMR T-20 on

DRAWING 18, is Category 3 (S0).

Replace circuit breaker SWBD 1N4G CB7 with a b reaker having an adjustable instantaneous tripping unit. Lewellyn Technology tried a 100A GE model SELA, Spectra RMS breaker with the instantaneous set to "3".

This change will reduce the PPE requirement at bus PNL 1N2H (PNL 1N2H MN CB LineSide) from Category 3 t o Category 0. T his change however, might affect the operation of transformer XFMR T-20 by not allowing for the full inrush current. (TCC SWBD 1N4G to PNL 1N2H) It is the customer's responsibility to consult their local equipment representative to

65. Bus PNL 1N2I (PNL 1N2I MN CB LineSide), fed from XFMR T-21 on DRAWING 13, is Category 3 (S0).

Replace circuit breaker BUSWAY 2 D3L CB with an electronic trip breaker having an LSI tripping unit and an interrupting rating greater than 40,790 amperes. Lewellyn Technology tried a 400A GE model FGN, Record Plus electronic trip breaker with the following settings: LTPU "400", LTD "1.25", STPU "2X", STD "0.12", i2t "Out", and an instantaneous trip of "8X" (3,200 amperes). This breaker has an interrupt rating of 65 kA. This change will reduce the PPE requirement at bus PNL 1N2I (PNL 1N2I MN CB LineSide) from Category 3 to Category 1. (TCC BUSWAY 2 to PNL 1N2I) It is the customer's responsibility to consult their local equipment representative to

66. Bus PNL 1N2K (PNL 1N2K MN CB LineSide), fed from XFMR T-30 on

DRAWING 13, is Category 3 (S0).

Replace circuit breaker BUSWAY 2 D1L CB with an electronic trip breaker having an LSI tripping unit and an interrupting rating greater than 40,890 amperes.