Characteristics of particular sources and loads
Most industrial and large commercial electrical installations include certain important loads for which a power supply must be maintained, in the event that the utility
electrical supply fails:
Either, because safety systems are involved (emergency lighting, automatic fireprotection
equipment, smoke dispersal fans, alarms and signalization, and so on.) or,
Because it concerns priority circuits, such as certain equipment, the stoppage of
which would entail a loss of production, or the destruction of a machine tool, etc.
One of the current means of maintaining a supply to the so-called "priority" loads, in the event that other sources fail, is to install a diesel generator set connected, via a change-over switch, to an emergency-power standby switchboard, from which the priority services are fed.
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