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Inspecting Commercial Electrical Systems

Section: 5 Distribution and Devices

Branch Distribution

Branch Circuit Distribution

Color-Coding Wires

Matching Overcurrent Device and Wire Gauge

Components of Branch Distribution

Types of Branch Distribution

Nonmetallic Cables

Armored Cables and Metal-Clad Cable

Other Types of Branch Distribution

Wireways and Auxiliary Gutters

Observations and Field Questions

Common Defects #1

Common Defects #2

Common Defects #3

Field Questions

Quiz #8: Branch Distribution

Outlets and Receptacles

Outlets and Receptacles

How a Receptacle Works

Installation of the Ground Conductor

Types of Receptacles

Single-Phase Receptacles

Three-Phase Receptacles

Receptacle Locations #1

Receptacle Locations #2

Testing Receptacles

Inspection Considerations

Defects Indicated by the Receptacle Testers

Overview of Inspection Tools

Quiz #9: Outlets and Receptacles

GFCI and AFCI Protection

GFCI Protection

Testing and Reporting on GFCI Receptacles and Breakers

AFCI Protection

Testing and Reporting on AFCI Receptacles and Breakers

Testing and Reporting on AFCI- and GFCI-Protected Devices

Observations and Field Questions

Field Questions

Quiz #10: GFCI and AFCI Protection

Switches and Lighting

How a Switch Works

Types of Switches

Rheostat/Dimmer

Motion/Occupancy Sensor

Three-way Switches

Four-way Switches

3 of 4

Testing and Reporting on AFCI- and GFCI-Protected Devices

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