Many buildings and structures are supplied by power from a source other than a utility service. If the supply—such as a transformer or generator—is customer-owned, it is not a service and, therefore, is either a feeder or branch circuit.
Occasionally, I provide training on electrical wiring in healthcare facilities, and frequently I am asked about the requirements for hospital-grade receptacles. One individual recently indicated that the medical building’s patient-care areas are being wired using hospital MC cable.
Generators are commonly installed for buildings or structures requiring emergency systems, legally required standby systems or optional standby power systems. Some generators are located within the building or structure they supply; but, frequently, they are located outside.
At a recent seminar, one of the attendees asked, “What is a ‘Ufer’ ground?” This is a common question. A “Ufer” ground is slang for what the National Electrical Code (NEC) addresses as a concrete-encased grounding electrode.