11/22/2017
Definitions
• Circuit ▫ Wires that carry electricity from a source to an electrical device and back • Circuit Breaker ▫ Switch which can stops the flow of electricity in a circuit when circuit is overloaded • Conductor ▫ Wire used to carry electricity • Conduit ▫ Channel or tube that carry conductors when protection is needed • Convenience Outlet ▫ Also referred to as Respectable
• Fixtures
▫ Lighting fixtures
• Ground ▫ All electrical systems have a wire connected to the ground • Service Entrance ▫ Wires/equipment which brings electricity into a facility • Service Panel ▫ Main panel which receives electricity from the service entrance • Switch ▫ Control used to manage the flow of electricity to electrical devices
Electrical Systems
Power Distribution Network
Grid Substation •400,000 to 275,000 Volts
Supply Point
Primary Substation •33,000 to 11,000 Volts
Overhead Lines
Step down
Transformer
•11,000 to 277/480 Volts
•277/480 to 120/208 Volts
•132,000 to 33,000 Volts
•11,000 Volts
•400,000 to 275,00 Volts
Service 480/208 V
Power
•Mechanical Equipment •Receptacles •Switches •Servers Lighting
Generator
Conductors
Main Distribution Panel
• Materials ▫ Copper
•Site •Building •Special •Lighting Control Low Voltage
Feeder
▫ Aluminum
• Sizing ▫ AWG – smaller the AWG number that lager the wire ▫ MCM – based on one mil of diameter • Group of conductors are called Cables • City of Chicago requires copper conductors
Sub Panels
•Fire Alarms •Exit Signs •Emergency Lighting •Speakers •Paging •Card Access •CCTV •Communications •Internet (Wi Fi)
Power
Lighting
Low Voltage
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