An electrical room houses critical electrical equipment like switchboards, circuit breakers, transformers, and backup batteries. The size of the electrical room is proportional to the building size, with large buildings having a main electrical room and smaller subsidiary rooms. Electrical rooms contain power distribution and communications equipment to safely supply electricity to a building.

1. CONTROL ROOM
An electrical room is a room or space in a building dedicated to electrical
equipment. The size of the electrical room is usually proportional to the
size of the building. Large buildings may have a main electrical room
and subsidiary electrical rooms. Electrical equipment may be for power
distribution equipment, or for communications equipment.
Electrical rooms typically house the following equipment:
 Electric switchboards
 Distribution boards
 Circuit breakers and disconnects
 Electricity meter
 Transformers
 Bus bars
 Backup batteries in a Battery room
 Fire alarm control panels
 Distribution frames