Services can be low voltage or high voltage (NEC definition) depending how you obtain your supply from the local utility. At our plant, we receive 115kV service and then transform and distribute within our customer owned distribution system. The NEC handbook has some good explanation of this distinction for campus styled multibuilding complexes in Art 90.2, 225.32, and 695.3 (C). The definition of service has changed over the years and many older engineers and electricians still use the old definitions. I have attached a few docs I developed to help explain services to my workforce. They may be of use to you also.
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Svc Xfmrs vs SDS.pdf [127.02 KiB]
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Services vs. Bldgs Supplied by Feeder with text (NEC 2020).pdf [466.19 KiB]
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Service Definitions.pdf [121.87 KiB]
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