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All electrical appliances applying mains voltage have to supply at minimum 2 degrees of defense to the person. This is to guarantee that if one of the safety layers ended up to fall short, there is the again-up of the second layer nevertheless in place. This would make electrical machines very protected to use. Appliances can be Course one or Course 2.When PAT testing, it is essential to very first detect the Class of the appliance as Class one appliances are analyzed in a different way from Course two appliances.Dependent on how accurately the defense is offered, electrical equipment are put into 5 Courses of tools building which are Class one, 2, 3, , 01. Of these the most essential are Class 1 & 2. For completeness all the Courses are explained down below.Course 1In this article the security is furnished by a mixture of insulation and use of the mains Earth. It is ideal demonstrated by referring to an electric powered fireplace that has been taken apart.In the open plug the three wires connecting to the Are living, NEUTRAL and EARTH pins. Inside the fire, the brown Dwell wire and the blue NEUTRAL wire link to a plastic connector. The environmentally friendly/yellow Earth wire connects to the steel circumstance of the fireplace.The consumer is guarded from electrical shock by the plastic insulation of the connector. This holds the Stay and NEUTRAL wires in place and helps prevent them from touching the metal case of this electric powered fire. This plastic insulation of the connector is acknowledged as primary insulation.If this standard insulation had been to fall short, say due to excessive motion of the cable in which it touches the metal case then the consumer of the fire can receive an electrical shock if not for the truth that the EARTH wire is existing.By connecting to the steel case of the electrical fire, the EARTH wire retains all this metallic at EARTH likely. What this implies is that it is unachievable to get an electrical shock even when the steel case of the fire is related straight to the Live voltage. In apply a fuse would blow both in the plug or the key fuse box to defend the user.In summary, in Class one appliances the consumer is guarded by a mixture of simple insulation and the provision of an EARTH connection, consequently offering two degrees of safety.When PAT Testing Class one appliances, the Earth Continuity and Insulation Resistance tests are carried out.Course 2In a Course 2 appliance, the user is shielded by at minimum two levels of insulation. For this purpose, Class 2 appliances are also known as Double Insulated. They do not involve an Earth relationship. This is ideal shown by wanting inside a Course two electrical drill which has been opened up. Inside 1 can see that as nicely as the plastic connector delivering fundamental insulation, there is extra insulation delivered by the plastic enclosure of the drill.The user is for that reason secured by two different layers of insulation. When PAT screening Class two appliances, just the Insulation Resistance exam is carried out.Course 2 appliances are usually indicated by the double box symbol on the score plate.Class 3Tools created to Course 3 common are intended to be supplied from a special safety isolating transformer whose output is acknowledged as Safety Extra-Lower Voltage or SELV. This will have to not exceed 50 V AC and is ordinarily is beneath 24V or 12V. All Course 3 appliances are marked by a particular image. There is no use of an Earth in Class III equipmentThe electrical safety of Class three appliances are taken treatment of in the security isolating transformer style exactly where the separation involving the windings is equivalent to double insulation. The transformer is marked as being suited for use with Class III appliances.Class & 01This kind of products is not for normal use in business enterprise or household environments. It is just offered in this article for completeness.Course appliances depend only on basic insulation for security from electric powered shock. For this purpose, they do not have two amounts of security crafted in and are not allowed for sale. The brass lamp shown below is an example of a two wire, metallic cased appliance with only basic insulation. There is no provision for link of an earth to the bulb holder.In Course 01 appliances, there is provision for an Earth connection, but it is wired with possibly twin core cable or only has a two-pin plug, so an Earth are unable to be related. AS in Class equipment, 1 is dependent only on fundamental insulation for safety from electric shock. As they only have 1 degree of safety, Course 01 appliances are not authorized for sale.If all through PAT tests one particular arrives throughout a Course or Class 01 appliance these can be unsuccessful.Identifying Course I & Class II EquipmentAs the PAT tests carried on Course 1 and Class two appliances differ, it is important to recognize 1 from the other. There is no other location of PAT testing that leads to much more confusion than this and there are a lot of myths encompassing this. It will be insightful to list some of these.If there is a fuse in the plug, then it need to be Class one.It is manufactured of steel so it ought to be Class oneThe situation is plastic so it ought to be Course 2It has a three core cable so it should be Class oneThe plug has a metal Earth pin so it will have to be Class 1None of the earlier mentioned statements is a fool-proof way to discover Class I and Course II appliances and some are very misleading.The easiest rule to implement is the one particular under.If the ranking plate has a double box then the equipment is Course 2. If it does not then it is Class 1.Illustration - KettleThe score plate on this kettle plainly has no "double-box" image, so employing our rule, it have to be Class one. The Earth link from the plug is terminated on the outside the house steel casing of the heating factor. When PAT testing this kettle the Earth Continuity and Insulation Resistance test has to be carried out.Example - Plug-top rated power provideThe ranking plate on this Plug-best transformer obviously displays the "double box" symbol, so this is a Class two equipment. Observe that it has a plastic Earth pin, as this is not required for Class II. (Not all Course 2 appliances have a plastic earth pin). Just the Insulation Resistance examination has to be carried out through PAT tests.Illustration - Mains extensionThe score plate on this extension is moulded in the plastic. It plainly does not have a "double-box" image, so it need to be a Class one. When PAT testing this extension direct the Earth Continuity and Insulation Resistance check has to be carried out.Case in point - Desk lampThe rating plate on this table lamp evidently exhibits the "double-box" so it is a Course 2 equipment. (Take note that this is a Class 2 equipment that is largely in a metallic enclosure). The bulb holder is designed of plastic and presents the required double insulation. Just the Insulation Resistance check has to be carried out all through PAT testing.