Insulation and Continuity Meters

Insulation and Continuity Meters

Course Introduction

Welcome to the e-learning module on

Insulation and Continuity Meters.

This course will take about 30 minutes to complete.At the end of this learning unit, you have to pass an exam to receive a certificate.

Course Objectives

During this module you will cover:

  • What we are testing. 
  • Why we are testing.
  • How to undertake the tests.
  • With what instruments we use for the tests.

Course Information

There will be short test questions as you progress through the course, with a final test at the end. Successful candidates will be awarded a completion certificate. This course is intended for Trainee Service Technicians relying upon mentoring from their Manager or other qualified person.

What we test?

What we test?

Vitally important is the earth return path from the metalwork on the appliance back to the earth point at the sub station transformer. The path back to the substation will be covered in another of these modules but when we servicing a metal bodied Class 1 appliance we must check the continuity of the earth from the plug top to the metalwork of the appliance.

What we test?

Domestic electrical appliances have a many electrical components and extensive wiring within them. All this electrical equipment must be electrically safe, one indication of the safety is the strength of the electrical Insulation between sections of these components and between the wiring, as well as the strength of the insulation to the metal body of the appliance.If this Insulation were to break down components may overheat or short to the metal earthed sections. Both of these situations we seek to avoid by testing the strength of this insulation on a service visit.

Why do we test?

Why we test an Appliance?

  • Why test functional testing?
  • Why test customer safety?
  • Testing components insulation
  • Testing traped wires

Why test functional testing?

Why test customer safety?

When you have repaired an appliance or even visited an appliance it is your responsibility to leave it in a safe condition, undertaking electrical safety tests would prove it is electrically safe.

Testing components insulation

Testing before you begin work can identify if components have failed or are beginning to fail.

Testing traped wires

To verify you have not inadvertently trapped any wires or any electrical connections are touching the metal cabinet.

Why test these appliances? Please complete the task.

Please 'tick 'the correct answers.

  • To impress the customer.
  • To verify it is safe to functionally test.
  • Testing an appliance can identify if components within a machine have a fault to earth or have failed.
  • Testing can identify if components are beginning to fail by indicating the insulation is breaking down.
  • To make sure you get a cup of Tea.
  • To identify if you have trapped any wires or have an earth fault on the appliance after you have worked on it.
  • To make sure the appliance is safe for the customer to use.
  • To make sure the appliance does not electocute the customers dog.

Exercise at the end.

Exercise at the end.

Welcome to the test at the end. 

You have 20 minutes to complete this. To be successful you will have to answer all the questions and attain a pass mark of  80%.

Question 1

Drag the description to the correct setting.

Complete the task and then click the Submit button.

  • Resistance scale for testing low resistance components.
  • Setting for earth continuity.
  • Megohm range for 240 volt appliances.

Question 2

Place the statements in the correct sequence.

Complete the task and then click the Submit button.

  • Visual check of the plug and Lead.
  • Earth Continuity from plug to accessible metal part of appliance.
  • Insulation resistance of appliance.
  • Repair the product using your multimeter to trace the fault.
  • Check the earth continuity and Insulation resistance before functionally testing.

Question 3

Identify the test here.

Complete the task and then click the Submit button.

  • Insulation Resistance test on Machine.
  • Earth Continuity Test on Machine.

Question 4

Link the sentence to the correct answer to make a correct statement.

Complete the task and then click the Submit button.

  • The minimum Insulation resistance for an appliance is
    2MΩ
  • The minimum Insulation resistance of a heater when hot is
    10MΩ
  • The maximum earth continuity of an appliance is
    0.1Ω

Question 5

Which test is this? Please tick the correct answer.

Complete the task and then click the Submit button.

  • Earth Continuity Test.
  • Insulation Test