Class: Senior Secondary School 2 (SS2 / SSS2)
Term: 3rd Term
Week: 6
Age: 16 years
Duration: 45 minutes
Subject: Basic Electricity
Curriculum Theme: Electrical Installation
Previous Lesson: Wiring Regulation: Preparation of Cable Ends and Method of Termination of Cables.
Topic: CONDUIT MATERIALS
Subject Matter: Meaning of conduit materials (definition), types of conduit materials (PVC conduit, metal conduit), classification of conduit materials (rigid, flexible), application of conduit materials (cable protection)

Specific Objectives

By the end of the lesson, pupils should be able to:

Cognitive Domain:

Define conduit materials.
State two types of conduit materials.
Classify conduit materials into rigid and flexible.

Affective Domain:

Appreciate the importance of conduit materials in electrical wiring.
Show interest in identifying different conduit materials.

Psychomotor Domain:

Identify PVC and metal conduit materials.
Demonstrate how conduit materials protect electrical cables.

Work cooperatively when discussing types and applications of conduit materials.

Reference Materials

The following resources were used in planning this lesson:

Senior Secondary Schools Education Curriculum
State Unified Scheme of Work
Basic Electricity for Senior Secondary Schools, Book 2.

Instructional Materials

The teacher will teach this lesson with the aid of:

PVC conduit
Metal conduit
Diagrams showing different conduit materials
Charts illustrating conduit applications

Rationale for the Lesson

This lesson helps pupils understand the materials used to protect electrical wiring in buildings. Knowing about conduit materials enables pupils to identify appropriate safety measures for electrical installations and ensures the longevity of electrical systems.

Prerequisite/Previous Knowledge

Pupils have a basic understanding of electrical wiring and the need for safety in electrical installations.

Lesson Content/Board Summary

CONDUIT MATERIALS

Meaning of Conduit Materials

Conduit materials are protective tubes or pipes used in electrical installations to house and protect electrical wires and cables. They shield wires from mechanical damage, moisture, and chemical exposure, ensuring the safety and reliability of the electrical system.

Types of Conduit Materials

The following are common types of conduit materials:

PVC Conduit: Made from polyvinyl chloride, a non-metallic material. It is lightweight, corrosion-resistant, and suitable for both exposed and concealed wiring. It is commonly used in residential and commercial buildings.
Metal Conduit: Made from metals like galvanized steel or aluminum. It offers high mechanical protection and is used in areas where cables are prone to physical damage or in industrial settings. Examples include Galvanized Rigid Conduit (GRC) and Electrical Metallic Tubing (EMT).

Classification of Conduit Materials

Conduit materials can be classified based on their flexibility:

Rigid Conduits: These are stiff and non-flexible pipes that require special tools for bending. Examples include PVC rigid conduit and Galvanized Rigid Conduit (GRC). They provide strong, permanent protection.
Flexible Conduits: These conduits can be easily bent and curved without special tools. They are used in areas where rigid conduits are difficult to install, such as connecting motors or in tight spaces. Examples include flexible metallic conduit (FMC) and liquid-tight flexible non-metallic conduit (LFNC).

Application of Conduit Materials

The primary application of conduit materials is cable protection. They are used to:

Protect electrical cables from physical damage, such as impacts or crushing.
Shield wires from moisture, dust, and corrosive chemicals.
Provide a pathway for electrical wiring, making it easy to replace or upgrade cables in the future.
Enhance electrical safety by preventing accidental contact with live wires.
Improve the aesthetic appeal of electrical installations by concealing wires.

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher displays different conduit materials (PVC and metal) and asks pupils to identify them and state what they think they are used for.
Pupils’ Activity: Pupils identify the materials and share their initial thoughts on their uses.
Learning Point: Pupils are introduced to conduit materials and their potential applications.

Step 2: Meaning of Conduit Materials

Time: 5 minutes
Teaching Skill: Explanation
Teacher’s Activity: The teacher explains the meaning of conduit materials, emphasizing their role in protecting electrical wires and cables.
Pupils’ Activity: Pupils listen attentively and take notes on the definition of conduit materials.
Learning Point: Pupils understand what conduit materials are.

Step 3: Types of Conduit Materials

Time: 8 minutes
Teaching Skill: Demonstration/Explanation
Teacher’s Activity: The teacher displays the PVC and metal conduits again, explaining their characteristics, advantages, and disadvantages.
Pupils’ Activity: Pupils observe the materials, ask questions, and note the characteristics of PVC and metal conduits.
Learning Point: Pupils identify and differentiate between PVC and metal conduit materials.

Step 4: Classification of Conduit Materials

Time: 8 minutes
Teaching Skill: Explanation
Teacher’s Activity: The teacher explains the classification of conduit materials into rigid and flexible types, providing examples for each.
Pupils’ Activity: Pupils listen and contribute to the discussion by identifying situations where each type might be used.
Learning Point: Pupils can classify conduit materials as rigid or flexible.

Step 5: Application of Conduit Materials

Time: 7 minutes
Teaching Skill: Discussion
Teacher’s Activity: The teacher leads a discussion on the various applications of conduit materials, focusing on cable protection and safety.
Pupils’ Activity: Pupils state different ways conduit materials are used to protect cables and enhance safety.
Learning Point: Pupils understand the practical applications of conduit materials.

Step 6: Discussion and Clarification

Time: 5 minutes
Teaching Skill: Questioning
Teacher’s Activity: The teacher encourages pupils to ask questions and clarifies any misconceptions about conduit materials.
Pupils’ Activity: Pupils ask questions and participate in clarifying discussions.
Learning Point: Pupils’ understanding is deepened and clarified.

Step 7: Evaluation/Review

Time: 5 minutes
Teaching Skill: Questioning/Assessment
Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

Define conduit materials.
Mention two types of conduit materials.
How are conduit materials classified based on flexibility?
State one important application of conduit materials.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 2 minutes
Teaching Skill: Summarization
Teacher’s Activity: The teacher summarizes the key points of the lesson, re-emphasizing the importance of conduit materials in electrical safety and installation. The teacher then gives homework: List three advantages of using PVC conduit over metal conduit.
Pupils’ Activity: Pupils listen to the summary and copy down the homework.
Learning Point: Pupils recall the main aspects of the lesson and are given further practice.

Lesson Keywords

Conduit – A tube or pipe used to protect and route electrical wiring.
PVC – Polyvinyl chloride, a type of plastic used for non-metallic conduits.
Metal Conduit – Conduits made from materials like steel or aluminum.
Rigid – Stiff and non-flexible, requiring bending tools.
Flexible – Easily bent and curved without special tools.

Differentiation

The teacher will provide additional visual aids or simplified explanations for pupils who are struggling to grasp the concepts. More advanced pupils will be encouraged to research specific types of conduit fittings and their uses.

Note for teachers using this lesson plan

Ensure you have actual samples of PVC and metal conduits for pupils to see and touch. Emphasize the safety aspects of using conduit materials. Encourage practical examples from the pupils’ environment where conduits are visible.