During any emergency or disaster, primary power and
communications between locations will probably be disrupted.
Therefore, a standby power-generation system
should be provided for emergency monitoring and
response. This standby power comprised of a backup gaspowered
generator or an uninterruptible power supply
with DC batteries to extend backup operation time will
keep emergency lighting, communications, and strategic
video equipment online as needed. Most installations use
a power sensing device that monitors the normal supply
of power at various locations. When the device senses that
power has been lost, the various backup equipments automatically
switch to the emergency power source.