106 Texas A&M International University C/ APPENDIX Prepared by Texas Registered Engineering Firm F-2113 March 2023 ELECTRICAL NARRATIVE EXECUTIVE SUMMARY Texas A&M International University (TAMIU) in Laredo, Texas consists of a total of approximately 1.3 million square feet of campus facility that includes laboratories, offices, classrooms, student housing, and playing fields. Electric power for the facility is provided by one overhead utility line originating from the east side of campus. The overhead lines run along the east and south sides of campus before transitioning to underground duct bank and running to the central plant to serve a medium voltage switchgear that serves the plant and campus feeder loops. These feeder loops serve dedicated transformers in each building via underground duct banks. Shah Smith & Associates, Inc. was commissioned to perform a facility review and master plan for the expansion of TAMIU from near term (3-5 year) to long term (20+ years) and provide recommendations for electrical distribution system improvements to support these goals. A. TAMIU FACILITY REVIEW The existing buildings on the campus are fed from the loop A and loop B feeders originating in the central plant medium voltage switchgear. The overhead line that serves the campus can serve approximately 10MVA of electrical demand. The feeder loops A and B are sized at 3#4/0 15kV MV90 with #2 600V ground. The ampacity of the feeder loops at this voltage in accordance with Table 311.60(C)(77) of NEC 2020 is 295A. Therefore, the maximum loading capacity of each of these feeder loop conductors is 6,370kVA. As the feeder loops are arranged to be redundant to the campus, the total campus distribution from these two feeder loops is 6,370kVA of campus building load. The maximum metered load data from AEP Texas, as of August 2021, is 4,337kVA on the overhead line serving campus, which includes both building load and the central plant electrical load. As part of the Master Plan development, some of these existing buildings are being renovated and new loads will be added. With the estimated current renovation and future loads, the existing overhead utility line serving campus will not be capable of serving the total new and existing loads of the campus. A second overhead distribution line from AEP Texas will be required to serve the long-term needs of the campus. B. RECOMMENDATIONS Attachment A02 shows the list of all the buildings that are slated to be added to the campus as well as their square footages, their estimated electrical demand, their proposed transformer sizes, and the mechanical infrastructure per phase required to support the new building square footages of that phase. This table is split into three parts, the phase 1 or nearterm loads anticipated in the next 3-5 years, the phase 2 or mid-term loads anticipated in the next 10-15 years, and the phase 3 or long-term loads anticipated in the next 20+ years.
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