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As a source of emergency lighting, which instrument is used generally?
DG set
Solar panel
UPS
All of above
DG set
A Diesel Generator (DG) set is the primary source of emergency power in industrial and commercial buildings to maintain critical lighting and essential loads during a utility power failure. While UPS systems provide instantaneous backup for sensitive electronics, DG sets are preferred for large-scale emergency lighting due to their ability to provide sustained high-power output.
A Diesel Generator (DG) set is the primary source of emergency power in industrial and commercial buildings to maintain critical lighting and essential loads during a utility power failure. While UPS systems provide instantaneous backup for sensitive electronics, DG sets are preferred for large-scale emergency lighting due to their ability to provide sustained high-power output.
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The DG set consists of a diesel engine coupled with an AC generator (alternator). Upon sensing a power outage, an Automatic Transfer Switch (ATS) triggers the engine to start, and once the generator reaches its rated speed and voltage, the ATS switches the emergency lighting bus from the grid supply to the DG output.
DG sets are categorized under standby power systems.
The ATS is critical for transition between normal and emergency sources.
DG sets provide high energy density compared to batteries.
Routine load testing of DG sets is mandatory as per safety codes.
High power capacity for long-duration outages
Cost-effective for high-load emergency lighting systems
Slow startup time compared to battery-backed systems
Requires regular fuel maintenance and produces emissions
Commercial complexes
Hospitals
Industrial production lines
Option B (Solar panel) requires battery storage to function as an emergency source.
Option C (UPS) is typically used for short-duration backup of critical IT equipment rather than general emergency building lighting.
A is correct тАФ DG set is generally used for large-scale emergency lighting as it provides sustained high-power output during grid failures.
Remember that while UPS is for instantaneous 'ride-through' capability, DG sets are the standard for high-capacity 'standby' duration requirements in electrical distribution design.