When PAT Testing portable appliances, it is essential for the person undertaking the inspections & testing to determine the correct equipment classification.This is paramount, because a specific test sequence exist for each class of equipment.
Classification of equipment are divided into three sections:
- Class I – Earthed Appliance
- Class II – Double Insulated Appliance
- Class III – Separated Extra Low Voltage
How to identify class 1, 2 & 3 appliances
Class 1 appliances do not rely upon basic insulation only, but also include an earth connection to exposed conductive parts. A class 1 appliance does not have a symbol indicating its classification.
Class 2 appliances contains supplementary insulation, with no provision for exposed metalwork to be connected to earth. A class 2 appliance is identified with a double insulated marking which is a symbol of a square within a square This symbol can be normally found on the appliance/equipment manufacturers plate.
Class 3 appliances are supplied at a low voltage (usually called Separated Extra Low Voltage) which must be less than 50 V. These appliances are supplied with a transformer supply that is also marked.
Of course, you might want to learn from an expert on a one-to-one level. Our PAT training courses can be carried out the comfort of your office, or at our premises. Courses can be booked as group booking or individual sessions.