SYSTEM CONFIGURATION
An electrical distribution system should be configured in a manner that ensures power supply to load centers economically and reliably.
Types of system configuration include
nRadial
nPrimary selective
nPrimary loop
nSecondary selective
POWER SOURCES
Emergency power sources include
nEngine driven generator set
nStorage batteries
nUninterruptible Power sources UPS
nUnit Equipment
Factors to consider when designing emergency power systems
nQuality of power required
nMotor starting requirements
nAnticipated future loads
nTime requirements
nSwitching conditions
nCapacity
SYSTEM VOLTAGES
Factors to consider in selecting utilization voltages include
nSpecific load server (size and voltage level)
nVoltage level supplied by the utility or on-site generation
nExisting voltage levels in the facility
nCost of electrical equipment and cable at different voltage levels and current ratings
nLosses due to higher current (at lower voltages)
nOverall system flexibility (i.e. capacity for future expansion)
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