Earth Continuity Testing

This test is carried out on all Class I appliances during PAT Testing. The purpose of the test is to check that there is a good connection between the Earth pin on the plug and the case of the appliance. A good connection is defined as having a resistance of less than 0.1 ohms (or 100 milli-ohms).

The Earth Continuity test is sometime referred to as the Earth Bond test or the Earth Resistance test. In effect they all measure that there is a good connection between the mains plug and the Earth point. The conventional way to carry out this test is to plug the appliance into a PAT Tester and clip the Test lead to a suitable earth point.

 When the test is done, if the resistance measured is less than 0.1 ohms, then there is a good earth connection and the appliance is considered safe. When carrying out this test during PAT testing, there are a number of practical things to be taken into consideration.

Insulation Resistance Test

This test is carried out on Class I and Class II appliances during PAT Testing. The purpose of this test is to ensure that there is adequate insulation between the Live parts of the appliances and the user touchable metal parts. Adequate insulation is defined as greater than 1 M ohm for Class I appliances and 2 M ohm for Class II appliances.


Earth Leakage Measurement

This test is carried out on Class 1 appliances and looks to see if there is any leakage current flowing from the live wire to the earth wire of an appliance. This current might be due to a breakdown of insulation, or components between Live and Earth (such as in surge protection devices,) or a combination of both. This test is done at full mains voltage i.e. at 230V. The appliance is plugged into the tester and while 230V mains is being applied, the tester measures the current flowing through the Earth wire. As the earth wire is known as the Circuit Protective Conductor, this test is now referred to as the “Protective Conductor current” test.

Visual & Functional Testing

This is a process of simply inspecting the appliance, the cable and the plug for any obvious signs of damage as well as making sure the item works as it should i.e. turn on/off, heats up etc.

NOTE: They do not cover Earth Bond Testing or Load Tests.

We can also test the following :-

13 amp plugs, 110v 16 amp yellow plugs, 240v 16 amp plugs, 32 amp blue/yellow plugs and different shaped 13 amp plugs.

Please ask if you have these requirements as we do not carry these attachments to test unless required.