ATTACHMENT 3 - 100 Design Narrative.pdf

Department of Veterans Affairs

Lake Baldwin – Orlando VA Medical Center

Improve Lake Baldwin Electrical Distribution

675-23-801 100% Design Narrative

Contract Number:

36C24819D0022 36C24823N0302

March 1, 2024

VA Lake Baldwin – Improve Lake Baldwin Electrical Distribution Narrative

Table of Contents

I. Design Schedule

II. Electrical Narrative

III. Civil Narrative

IV. Structural Narrative

a. Structural Calculations

Improve Lake Baldwin Electrical Distribution 675-22-801 Electrical Narrative

AESUS Design Group E - 1

Electrical Narrative

Introduction

The project's scope of work entails addressing specific electrical deficiencies at the Lake Baldwin and Lakemont VA campuses located in Orlando, FL. The objective of the project is to rectify these deficiencies by undertaking a series of activities such as repairing, relocating, replacing, and correcting various electrical equipment. The specific items to be addressed are:

At VA Lake Baldwin:

1. Repair or replace the tie breaker within building 500’s switchboard 3 tying switchboard 2 and 3 together.

2. Provide a disconnecting means at the south OUC utility switch.

3. Replace medium voltage transformer MV-XF-ENG in front of building 3130 and relocate a portion of the overhead power lines crossing the road underground.

4. Replace medium voltage transformer MV-XF-504 located north of building 504 between building

504 and 502. Provide emergency generator backed power to building 504.

5. Replace 208Y/120V voltage 519-ATS-K serving the domiciliary.

6. Replace 480Y/277V 502-ATS-A serving the fire pump.

7. Replace (3) Medium Voltage ATS

At VA Lakemont:

8. Replace exterior ATS and relocate to a covered location outside of the chiller yard.

The project includes a comprehensive analysis of the existing distribution system at Lake Baldwin, with the goal of determining the feasibility and practicality of providing a generator-backed power to the entire campus. The analysis will be conducted with a focus on identifying critical loads, evaluating the capacity of the existing emergency system and assessing the economic and technical feasibility of the proposed solutions. The results of the analysis will be presented in a separate narrative and set of documents, providing valuable insights into the strengths and weaknesses of the several proposed solutions and associated electrical improvements that may be necessary to support the proposed generator-backed power system.

General Design Guidelines

The following guidelines shall establish the basic standards of construction for the work associated with this project:

• All work described herein shall conform to the National Electric Code (NEC) – NFPA 70, The International Building Code, The Health Care Facilities Code, NFPA 99, The Life Safety Code, NFPA 101, The International Energy Conservation Code, and VA design guidelines.

Project Scope

This section provides an overview of the project areas and equipment, the current challenges encountered in those areas, and the proposed remedies to address the challenges.

At Lake Baldwin:

1. Replace the tie breaker within building 500’s Switchboards 2 and 3.

Switchboards 2 and 3 are tied together through a single 1,600A breaker mounted within Switchboard

3. The VA facilities personnel have stated that while the switchboards are fed from utility power the tie

AESUS Design Group E - 2 breaker functions as expected. However, when the generators are running, the tie breaker will trip.

This is not how the tie breaker is intended to function and can cause unnecessary outages. For instance, in the event of an outage in Switchboards 2 or 3 while a generator test is ongoing, the tie breaker may fail to operate correctly, resulting in a substantial power loss to building 500.

Per the as-built drawings, as-built submittals and field observations the main breakers within Switchboards 2 and 3 and the tie breaker are kirk-keyed. Each breaker also appears to have a shunt trip. However, it is unclear what exactly was connected to the shunt trip of each breaker. Neither the drawings nor submittals indicated the intended use of the shunt trip functionality. It was also not feasible to trace the wire in the field either. If the shunt trip can be examined during the next planned outage/maintenance event it may be possible to determine if the shunt trip is the source of the nuisance tripping.

Figure 1 - Tie Breaker

Notwithstanding, the proposed solution currently is to replace the tie breaker and provide proper programming, interlocks and shunting such that the tie breaker performs properly under both normal and emergency situations.

2. Add a disconnecting means at the OUC south utility feeder.

The south utility owned multi-way switch does not have any government accessible means of disconnecting. The switch has hardwired outputs that feed medium voltage switches MV-MWS-NO.3 and MV-ATS-NO.4. In order to disconnect the south utility, the incoming switches at the medium voltage multi-way switch must be opened. There is no way to disconnect the feeder to the ATS. The OUC south utility cabinet is not owned by the government and as such, breakers or switches cannot be added to the existing switch.

The proposed solution is to intercept the output feeders at manhole 89, install an additional government owned multi-way switch and re-feed both MV-MWS-NO.3 and MV-ATS-NO.4. This provides the government with the ability to disconnect power from the south at a single location.

During the summer of 2023 another project provided a new underground ductbank from the south OUC switch to manhole 89. As-builts of this project have not been provided to the AE team. These as-builts need to be reviewed to confirm the proposed solution is feasible.

AESUS Design Group E - 3

3. Replace the transformer in front of building 3130 and relocate a portion of the overhead power lines crossing the road underground.

Figure 2 Figure 3 Transformer, Disconnect and Pole Overhead Line Spanning Comfort, Ave.

The transformers and secondary disconnect are both in need of replacement. Both will be replaced in place, like for like. A portion of the transformer secondary travels overhead over a driveway. The overhead lines are not high enough and often get clipped by trucks causing outages. This project will relocate that portion of overhead lines (approximately 200 linear feet) underground. The new underground duct-bank will originate at the new transformer MV-XF-ENG, traverse underneath the road and end the existing power pole directly north of building 3129. The feeder will rise up the pole and be spliced into the existing overhead lines.

Building 3129 is currently fed from an overhead wire that is spliced mid span. This can be seen in figure 3. This feeder will also need to be replaced and the building re-fed. An additional power pole will be provided to the east of building 3129 and re-feed building 3129 via a new overhead power line.

4. Replace transformer between building 504 and 502 and provide emergency generator backed power to building 504.

The existing transformer MV-XF-504 is in poor condition, appears past the end of its useful life and is in need of replacement. This transformer will be replaced in place.

AESUS Design Group E - 4

Figure 4 – MV-XF-504 as seen from Bld. 502

Additionally, this building will be re-worked in such a way as to provide generator backed power to the entire building. An existing breaker within SWBD EM within the CEP will be utilized and an additional underground conduit will be provided from building 502 to building 504. An additional transformer will be added to transformer the voltage from 480 to 208Y/120V. This transformer will be placed outside building 504 next to MV-XF-504. An ATS will be added fed from both transformers. Other equipment may be added/modified as well to accommodate the additional feeder and source. Additional documentation is required from the VA with regards to this building to finalize a design.

5. Replace ATS at Domiciliary

The ATS feeding the Domiciliary, 519-ATS-K is non-functional and needs to be replaced. The ATS feeds panel K located inside the domiciliary. The ATS is located outside on the west well directly outside the exit door. This will be replaced in place. There is no other work at the domiciliary as part of this project.

The alternate feed and generator start signal for 519-ATS-K originates in building 503. Note: Bld. 503 is owned by the state and not the VA. The scope of this project does not include providing a new alternate emergency feeder from a VA owned building. The existing emergency feeder and generator start signal will be used for this project.

a Figure 5 - 519-ATS-K

6. Replace the fire pump ATS.

The fire pump ATS, 502-ATS-A, is to be replaced as part of this project. The ATS will be replaced in place. The fire pump itself and all associated feeders are existing to remain. The fire pump controller and transfer switch are two separate enclosures. Only the transfer switch will be replaced as part of this project.

AESUS Design Group E - 5

Figure 6 – 502-ATS-A

7. Replace medium voltage ATSs No. 2, 3 and 4 in place. All incoming and outgoing feeders are to remain the same.

At Lakemont

8. Relocate or Replace ATS in chiller yard under a covered area.

There is an existing ATS located near the chiller within the chiller yard walls. This ATS is not protected from the elements or the chiller spray. This ats will be relocated and replaced as part of this project.

The ATS feeders will be intercepted and re-routed to the new location. The ATS will be located at the west end (right side of figure 7) of the existing canopy covered equipment outside the chiller yard proper. The canopy will be extended to cover the ATS. There is no other work to the ATS or Lakemont distribution system as part of this project.

Figure 7 – Existing Canopy to be extended.

AESUS Design Group E - 6

Furthermore, the following applies to the areas in scope:

Electrical Service and Distribution:

• All existing electrical service and distribution are to remain “as-is” unless noted otherwise.

Additions or modification to any panel or service will be documented.

• No additional backup, standby or emergency power will be required unless specifically noted.

Branch Wiring:

• Branch wiring system will be installed in accordance with 2017 NEC. Each branch circuit will utilize a dedicated neutral conductor. All branch circuits shall utilize an equipment grounding conductor in each conduit. The conduit will not be allowed to be used as the sole grounding path.

• All branch circuiting will be copper conductors in conduit. Minimum conduit size will be 3/4”.

• Typical branch circuit wiring will be minimum #12 AWG CU, installed in EMT conduit for power and lighting systems. Rigid conduits shall be used for all exposed conduit runs where EMT would be subject to physical damage as defined by the National Electrical Code (NEC). Conduits to be installed concealed, except where installed in electrical rooms, mechanical rooms or other unfinished areas.

• All empty conduits shall have a pull string installed in them.

• All panelboard feeders shall be copper conductors installed in conduits.

• All electrical equipment shall be bonded with a dedicated equipment grounding conductor.

Wiring Devices:

• Wiring Devices shall be hospital-grade, tamper-resistant duplex receptacles rated for 120V with 5-20 NEMA configuration, nylon type, with finishes determined by architect. Device faceplates shall be stainless steel.

• Interior receptacles located within 6 feet of a water source shall be provided with GFCI.

• Wiring devices to be mounted in 4” square x 2-1/8” deep minimum boxes with appropriate gang mud ring.

• Where wiring devices are surface mounted or in unfinished areas, devices to be mounted in a 4” square outlet box with matching industrial raised cover plates.

• Device wall plates to have extra strength laminated adhesive tape labels indicating the source panel and circuit number. Labels to be white with black letters for “normal” power and red with black letters for “emergency” power.

• Receptacles shall have the following finish:

o Normal = White o Life Safety / Emergency = Red

• Receptacle cover plate to be stainless steel.

• Receptacles to be installed in accordance with the electrical drawings.

Lighting and Lighting Control Systems:

• There is no lighting as part of this project.

Fire Alarm System:

• There are no additions or modifications to the fire alarm system as part of this project.

Information Technology Systems:

• There are no additions or modifications to the IT system as part of this project.

Security and Access Control:

• There are no additions or modifications to the access controls system as part of this project.

SWS Engineering, Inc.

Civil Engineering | Land Surveying | Land Planning | Construction Staking

2400 Maitland Center Parkway, Suite 235 Maitland, FL 32751

SAN DIEGO NASHVILLE PHOENIX ORLANDO

Improve Lake Baldwin Electrical Distribution – 100% Narrative

VA Project #:

Engineer: Michael D. Schweitzer, P.E.

March 4, 2024

Civil Design Narrative

Design References

The project will be designed and constructed in accordance with VA program guides, directives, design manuals, and specifications in conjunction with industry standard criteria.

Building Codes and Design References

1. U.S. Department of Veterans Affairs, Master Specifications PG-18-1

2. U.S. Department of Veterans Affairs, VHA Program Guide PG-18-3, July 2021

3. U.S. Department of Veterans Affairs, National CAD Standards and Details PG-18-4

4. U.S. Department of Veterans Affairs, Construction Standards H-18-3

5. U.S. Department of Veterans Affairs, Design Manuals PG-18-10

6. U.S. Department of Veterans Affairs, Design Submission Requirements PG-18-15C

7. ACI 360R-10, Specifications Guide to Design of Slabs-On-Ground

Existing Conditions:

The Lake Baldwin VA Medical Center campus is a suite of buildings surrounded by parking lots to the north, south, east, and west. SWS Engineering, Inc. (SWS) is being tasked with miscellaneous site design to support the electrical distribution upgrades as designed by AESUS Design Group.

Site Demolition:

This project will involve limited site demolition as needed to remove existing electrical gear as shown on the Electrical plans designed by AESUS Design Group. Contractor shall evaluate the conditions of the existing concrete pads upon removal to determine if they can be reused for new electrical equipment. If the existing concrete pads are damaged or unsuitable to support new electrical equipment, the contractor shall remove the existing pads.

Site Improvements:

Proposed site improvements will include new electrical gear as shown on the Electrical Plans as designed by AESUS Design group, new concrete encased duct banks, and new concrete pads (as needed) to support new electrical gear. In addition, the project may include miscellaneous sidewalk and pavement repairs as required to install the new electrical duct banks.

VA Orlando – Lake Baldwin Clinic Structural Narrative

AESUS Design Group S-1

Introduction

The scope of work will involve extending an existing canopy and its concrete pad at one location.

Additionally, a canopy over an existing concrete pad will be added at another location. The existing concrete pad will be extended, too.

The canopy extension will be performed by others.

All aspects of the design shall be in full compliance with VA design criteria as listed in VA design guides and manuals and comply with the latest building codes.

The following codes and design criteria shall be utilized to the extent applicable:

• 2020 Florida Building Code

• 2016 Minimum Design Loads and Associated Criteria for Buildings and Other Structures -

American Society of Civil Engineers (ASCE 7-16)

• 2019 Building Code Requirements for Structural Concrete – American Concrete Institute

(ACI 318-19)

• 2016 Building Code Requirements and Specification for Masonry Structures – The

Masonry Society (TMS 402/ 602-16)

• 2016 Steel Construction Manual, 15th Edition – American Institute of Steel Construction

(ANSI/AISC 360-16 15th Ed.)

• 2018 National Design Specification for Wood Construction – American Wood Council

(2018 NDS)

• VA Seismic Design Requirements (H-18-8)

• VA Physical Security Design Manual

• VA Structural Design Manual – Most Building Types

• VA Master Specifications

Existing Conditions

The existing conditions consist of an existing canopy with a concrete equipment pad. At another location there is an existing concrete equipment pad.

Scope of Work

Provide an extension of the equipment pads for the canopy extension and addition. This will involve placing an 8-inch concrete equipment pad down with #4 bars at 16” on center, each way.

Attachment to the existing concrete equipment pads with be with #5 bars at 8” on center. These will be epoxied into the existing concrete pad with an embedment of 8 inches.

Concrete caissons will be provided for the columns of the new canopy addition.

The canopy extension is by others.

06 675-23-801 Baldwin 100% Structural Narrative