Mechanically operated switches commonly found in motor control circuits
A mechanically operated switch is one that is controlled automatically by factors such as pressure, position, and temperature.
Transformer Connections and Systems
Transformer polarity refers to the relative direction or polarity of the induced voltage between the high-voltage and low-voltage terminals of a transformer
What is the Working Principle of a Transformer?
A transformer is used to transfer AC energy from one circuit to another. The two circuits are coupled by a magnetic field that is linked to both instead of a…
Power Distribution Systems
Distribution systems used to distribute power throughout large commercial and industrial facilities can be complex
Manual and Magnetic Motor Starters
Manual motor starters are a very basic way to supply power to a motor. A manual control circuit is a circuit that requires the operator to control the motor directly…
Motor Nameplate and Terminology
The motor nameplate (Figure 2-38) contains important information about the connection and use of the motor. An important part of making motors interchangeable is ensuring that nameplate information is common…
DC Motor Connections
Industrial applications use DC motor because the speed–torque relationship can be easily varied. DC motor applications include cranes (Figure 2-24), conveyors, elevators, and material handling processes. Figure 2-25 shows the…
Wiring—Single line—Block diagrams of the motor system
Wiring Diagrams Wiring diagrams are a visual representation of the point-to-point wiring between components of an electric system and their physical relation to each other. They may include wire identification…
Electrical safety codes and standards
OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION (OSHA) In 1970, Congress created a regulatory agency known as the Occupational Safety and Health Administration (OSHA). The purpose of OSHA is to assure safe…
Lockout and tagout in electrical safety
Electrical “lockout” is the process of removing the source of electrical power and installing a lock, which prevents the power from being turned ON. Electrical “tagout” is the process of…