What is the PAT test frequency?:
The IEE code of Practice recommend that the PAT test frequency depends on the type of equipment, location, and the environment in which the equipment is used.
PAT test frequency in regards to equipment type:
Hand held appliances are much more likely to be damaged than fixed appliances. Class I appliances (containing and earth) have a higher risk of danger because the safety of the appliance depends on the continuity of the protective conductor from the plug to the appliance.
PAT test frequency depending on users:
Users of the equipment should be trained in line with a company’s health and safety policy. If employees are trained on being able to report faults when they occur or inspecting faulty looking equipment, this will reduce the PAT test frequency. The PAT test frequency will then depend on a Risk Assessment (focusing on dangerous risks which have the potential to cause harm). With a Risk Assessment the PAT test frequency will be reduced. On the other hand, if appliances are more likely to be subject to damage then the PAT test frequency is increased.
PAT test frequency in regards to the environment of the appliance:
If an appliance is used in an environment where it is more likely to be damaged, for example, a construction site, the PAT test frequency should increase.
PAT test frequency and equipment construction:
Protection of a Class I appliance depends on the connection with earth of the electrical installation; if the cable is damaged then the connection with the earth may be lost.
PAT test frequency with new equipment:
Many people assume that the PAT test frequency for new equipment is very rare. New equipment may have, for example, a power supply lead with reversed polarity or has not had the metal case bonded internally to the earth conductor of the power supply lead. Therefore, it is suggested that new equipment is purchased from reliable sources and the appliance is visually inspected for signs of damage. Appliances which are brought onto the premises by a member of staff from home could be more dangerous because it is coming from an unknown background.