Electrical and Electronics: Module

Module 7A: Overcurrent Devices (Core)

Suggested time: 10 - 15 hours

Level: Introductory

Prerequisites: Modules 2, 6

Foundational Objectives

To be knowledgeable and skilled with different materials and devices and their application in the electricity and electronics field.
To demonstrate the safe use and knowledge of meters and hand and power tools used in the electrical industry.

Common Essential Learnings Foundational Objectives

To understand and describe the different types of circuit protection devices that are used in the electrical trade. (COM)
To use appropriate testing equipment. (TL)

Learning Objectives	Notes
FUSES
7.1 To understand how a fuse works and explain its purpose. (COM)	Referring to Ohm's Law, discuss with students what is an overloaded circuit. Discuss what would happen in a short circuit situation. Students should wire a fuse in an electrical circuit. Using a tester, have students troubleshoot a circuit with a fuse in it.
7.2 To identify different types of fuses.	Examine different fuse types (e.g., plug fuses, cartridge fuses, time-delay fuses, renewable fuses) and explain their use. Have the students calculate the fuse rating for a given circuit.
CIRCUIT BREAKERS
7.3 To demonstrate the current flow through a circuit breaker.	Have students wire an electrical circuit using a circuit breaker. Students should draw a schematic diagram showing current flow.
7.4 To identify the bi-metallic strip that is used in a breaker.	Have students take a breaker apart and explain all the parts.
7.5 To select the correct size of circuit breaker for specific loads. (NUM)	Using Ohm's Law, have students calculate the right size breaker for a circuit. Observe the different types of breakers used for different purposes (e.g., double pole single throw).

Module 7B: Overcurrent Devices (Core)

Suggested time: 10 - 15 hours

Level: Intermediate

Prerequisite: Module 7A

Learning Objectives	Notes
GROUND FAULT INTERRUPTERS
7.6 To understand the use of a Ground Fault Interrupter (GFI) in a circuit. (TL)	Review operation of a GFI. Using the current federal and provincial resources defining electrical codes students will find where GFIs should be used. Have students examine a GFI. Investigate situations where GFIs can be installed at the receptacle.
7.7 To demonstrate the correct placement of a GFI in an electrical circuit.	Indicate the colour coding differences for the feed through side and the down stream side of the GFI.