MIL-HDBK-1191
Parallel operations of the generator sets will be as indicated by Fig 10-1.
Automatic load shedding with manual override controls and load shifting
capacity will be incorporated in-the-event that one generator fails. Each
generator will have the capacity to handle the life safety and critical care
demand loads.
ENGINE GENERATOR SETs. Engine generator sets for hospitals
10.3.5
(MEDICAL FACILITIES) will be powered by diesel fuel and conform to Table 10-
2, "Diesel Electric Generator Sets for Medical Facilities (for 60-Hz power)."
The preferred generating voltage is the highest utilization voltage proposed
for the facility. Normally 480Y/277 volt, 3-phase, 4-wire system is the
highest utilization voltage. Higher voltages may be generated where line
losses would otherwise be excessive. The sets will include automatic start-
and-stop equipment, solid state battery chargers, fuel storage tanks, audible
and visual warning device to alert of less than 4 hours fuel supply, and day
tanks and radiators as required. The engine will have a residential type
exhaust silencer and will be able to start and assume its full electrical
loads within 10 seconds from the interruption of the normal electrical power
source. Generator controls will include reverse power relays to prevent
generator damage from commercial or on site generators per NFPA-110. If
computers are to be operated directly from the emergency generator (not
through a UPS or uninterrupted power supply), an isochronous governor is
required.
10-6
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