Measuring Electricity (01:02)
At the heart of any electrical system is electricity itself--the movement of electrons. Units of electrical power are watts, or the product of volts multiplied by amps. Electrical measure in kilowatt-hours.
How Electricity Travels (01:18)
Power companies generate electricity at power plants, and then increase the voltage through step-up transformers. Voltage is then reduced to 120 volts at utility pole transformers. Electricity arrives through the service drop and the electric meter.
Purpose of Main Service Panel (02:02)
The main service panel acts as the control center and safeguard for the whole electrical system. The service panel is often called the fuse box or breaker box. Branch circuits leave the panel and go to different parts of a house.
Materials for Electrical Work (02:06)
In electrical wire, a conductor holds the electrons loosely to let current pass, and the insulator holds the electrons tightly. Flowing electrons encounter resistance, measured in ohms. Cables and conduit systems are demonstrated.
How Electricity Travels Through a Residence (03:14)
Electricity travels throughout a residence through boxes and receptacles. Each of these comes in a variety of types for specific purposes.
Electrical Safety and Regulations (03:16)
Underwriters Laboratories Inc. (UL) and National Electrical Code (NEC) provide product safety certifications and regulate electrical work. Electricians must follow specified safety measures as demonstrated in this segment.
Electrical Work Tools (02:25)
Using specified electrical symbols, electricians draw up circuit or wiring plans and make a materials list prior to getting a permit to alter an electrical system. The drawings must follow code requirements.
Preparation for Cable Running (02:30)
Before installing running cable, electricians must determine the most efficient path, and comply with code's height regulations and staple placement. This segment includes box installation, measurements, and circuit testers.
Wiring Tools (03:47)
Tools and processes used in wiring include cable rippers, side cutters, combination tool, wire nuts, and pigtailing. Detailed demonstrations guide the viewer through wiring processes.
Electrical Wiring Tips (02:02)
Plastic boxes do not conduct electricity, whereas metal boxes do. Electricians make sure metal boxes are double-grounded. Finish work includes patching holes in ceilings and walls, and cleaning up all remains of electrical wiring and tools.
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