Portable appliance testing (PAT) is the term used to describe the examination of electrical appliances and equipment to ensure they are safe to use. Most electrical safety defects can be found by visual examination but some types of defect can only be found by testing. However, it is essential to understand that visual examination is an essential part of the process because some types of electrical safety defect can't be detected by testing alone.
The Electricity at Work Regulations 1989 require that any electrical equipment that has the potential to cause injury is maintained in a safe condition. However, the Regulations do not specify what needs to be done, by whom or how frequently (ie they don't make inspection or testing of electrical appliances a legal requirement, nor do they make it a legal requirement to undertake this annually). For Guidance see here
There is no legal requirement to label equipment that has been inspected or tested, nor is there a requirement to keep records of these activities. However, a record and / or labelling can be a useful management tool for monitoring and reviewing the effectiveness of the maintenance scheme – and to demonstrate that a scheme exists.
It's a myth that all portable electrical appliances in a low-risk environment, such as an office, need to have a portable appliance test (PAT) every year. The law simply requires employers to ensure electrical equipment is maintained in order to prevent danger – it doesn't state what needs to be done or how often. However, the table opposite provides some guidance on the frequency of testing.
Source: HSE publication HSR25 Memorandum of guidance on the Electricity at Work Regulations 1989
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