The confusion around PAT testing often comes down to one question: Does my specific tool need to be tested?
The quick answer is that any mains-powered, portable tool you use on a site or in a commercial workshop is subject to the UK’s electrical safety maintenance requirements, usually fulfilled by PAT testing.
Corded (Mains-Powered) Tools (Class I and Class II)
These are the primary focus of PAT testing. In the UK that means any tool that plugs directly into a 110V or 240V socket must be tested.
- Corded Drills, Grinders, Saws: These are typically {Class I} equipment and rely on the earth pin for safety. They require the most rigorous testing (Earth Continuity and Insulation Resistance). Due to the high-impact nature of site work, they require frequent testing, often every 3-6 months as determined by a risk assessment.
- Site Transformers & {RCD}s: These are considered part of the “system” and are subject to the same testing requirements.
- Extension Leads: These are the highest-risk item and absolutely must be tested. They are covered in detail in our dedicated guide.
Cordless (Battery-Powered) Tools
The cordless tool itself is low-risk and does not need a PAT test. The battery is simply a power source and the tool’s mechanics are isolated.
However, the charger unit MUST be tested.
- Chargers: These plug into the mains and convert voltage. They are usually {Class II} (double-insulated) and require PAT testing, often on a 1-month interval (medium-risk). Testing the charger ensures the safe transfer of power from the wall to the battery.
Low-Voltage and Hand Tools
- Hand Tools (e.g., Hammers, Screwdrivers): No, these have no electrical components and do not require testing.
- 12V/USB} Power Banks: If used to charge phones or accessories, these are typically considered low voltage and are not usually part of the formal PAT scheme, though their mains charger would be.
The legal duty to maintain safety applies to all your equipment. So for example in a staff canteen would include fridges, toasters and kettles to name a few. It also would include PCs, laptops and printers.
Read our comprehensive guide on documentation and legal penalties here: The Mandatory UK Guide to PAT Testing for Tradesmen.