PowerPoint presentations to increase your knowledge
The presentations below are available to presenters and learners alike. They cover a variety of subjects involving electrical distribution systems, ratings, components, codes and standards.
For complete information on each slide, please view the presenter notes.
Learn about the application considerations of an electrical system based upon roles: owners, architects, electrical engineers, contractors, electricians, electrical inspectors, workers/maintenance workers, insurance companies.
Learn about overcurrent events and how to calculate their typical values.
Learn about the types of overcurrent protective devices (fuses and circuit breakers) and how they operate to protect a circuit.
Learn about overcurrent protective device voltage ratings and how they affect application decisions.
Learn why interrupting ratings are the highest current levels at rated voltage that devices are identified to interrupt under standard test conditions.
Learn about the three ratings that must be observed for proper applications of overcurrent protective devices and two methods of achieving adequate interrupting ratings for fully rated and series rated systems, along with common misunderstandings surrounding series rated systems.
Learn why the degree of current-limitation, and protection, depends upon the type of current-limiting overcurrent protective device selected (circuit breaker or fuse).
Learn why electrical system components must be applied within their short-circuit current ratings, or be destroyed if the overcurrent protective devices do not limit the short-circuit current to within the short-circuit current rating of the system’s components.
Learn why selective coordination is a mandatory requirement in the National Electrical Code to increase system reliability for delivering power to vital loads.
Learn about selective coordination and the sections of the 2014 NEC that require “selective coordination” for fuses and circuit breakers on specific systems, and special requirements for “coordination” in Healthcare facilities.
Learn about ground faults and why they are a special form of short circuit. All ground faults are short circuits, but not all short circuits are ground faults.
Learn about the codes and standards applicable to the installation and operation of elevators.
Learn how a motor circuit operates and how to protect the components involved in the motor circuit from overloads and short circuits.
Learn about short-circuit current ratings of components that identify the maximum short-circuit current to which the components can be applied. In some cases, the short-circuit current is dependent upon a specific type and size of overcurrent protective device.
Learn the key changes to the 2014 NEC that affect overcurrent protection.
For additional information on these subjects and more, see the Bussmann Division's handbook Selecting Protective Devices (SPD) No. 3002. Click here for the web page.