1. Electrical Systems
Construction
Mr. O

2. Components Incoming Electrical Lines Electrical Meter Service Panels
and Subpanels
Wiring
Outlets
Switches
Appliances

3. Rough-In Components Wires Cables Electrical Boxes
All added during beginning stages of construction

4. Finish Components Outlets Switches Light Fixtures
Added toward the end of construction

5. How it Works:
Electricity is delivered through overhead lines and/or underground conduit to your house
Typically a three-wire system (two hot wires each delivering 120v, plus a neutral)
Runs through electric meter to main service panel (breaker box)
Electricity travels in a closed path from source to device, then back to source

6. Electrical use Household lights and small appliances use around 110v
Two wire system
(one hot, one neutral
Plus a ground)

7. Electrical Use (cont’d)
Larger appliances use around 240v
(electric stove, dryer, larger AC)
Three wire system
(two hot, one neutral,
Plus a ground)