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When understanding the test and tag intervals and how often an electrical appliance should be tested, the main underlying factor is the type of environment that appliance is located in.
Just as important, the AS/NZS 3760 standard (Table 4 shown below) should be seen as a minimum test and tag requirement. A lot of workplaces and company owners will have different test and tag frequencies because of their own risk management and OHS planning. Likewise, some of these industries might require you to use certain Test and Tag Colours.
For the most common environments, we recommend the following frequencies:
According to the AS 3760 Standard which oversees the industry in Australia, the intervals listed below are only a recommendation and should be taken into account as a minimum requirement when you are PAT testing. If you have been given the job to test and tag a workplace and then discover that the previous person responsible for this task was testing items at a different frequency than recommended, it could be because:
1) The person testing and tagging was ill-informed about the test periods and is doing it incorrectly
2) The workplace business owner has completed their own risk assessment
If you require any clarification or you're unsure of your test intervals, please contact us or call 1300 848 302.
Source: AS/NZS 3760:2010 and SAI Global