Portable Appliance Testing, usually shortened to PAT, is the process of checking electrical equipment to make sure it is safe to use. If you manage a workplace, a rental property, or a shared building, one of the first questions is always the same: which items actually need checking, and how often? This guide explains what PAT testing covers, what the general requirements are, which types of equipment fall inside or outside the scope, and how to build a testing schedule that makes sense for your situation.
What Is PAT Testing?
PAT testing is a combination of a visual inspection and a set of electrical safety tests carried out on equipment that connects to the mains supply. The aim is simple: find damage, wear, or faults before they cause a shock or a fire.
The word “portable” is slightly misleading. In practice, PAT testing covers far more than items you can easily pick up and carry. It includes anything connected to the electrical supply by a plug and flexible cable, from a phone charger to a fridge.
Is PAT Testing a Legal Requirement?
There is rarely a single law that says every appliance must be tested once a year. Instead, general workplace and electrical safety rules place a duty on employers, landlords, and people in control of premises to keep electrical equipment maintained so it does not cause danger.
PAT testing is one of the most common and practical ways to show that this duty has been met. The sticker on the plug is evidence of the check, not the requirement itself. That distinction matters, because it means the real question is not “which items legally need a sticker?” but “which items need to be maintained and checked, and how?”
In broad terms, those responsible for electrical equipment are expected to:
- Keep equipment in a safe condition and use it correctly.
- Arrange inspection and testing where it is needed, based on risk.
- Keep records of the checks that have been carried out.
- Take faulty items out of use immediately and repair or replace them.
What Kind of Equipment Needs Checking?
Almost anything with a plug and a flexible cable can fall within the scope of PAT testing. Equipment is usually grouped by how it is used and how likely it is to be damaged.
Portable appliances
These are items that are moved regularly and are easy to carry, such as kettles, toasters, lamps, chargers, small fans, and cleaning equipment. Because they are handled and shifted often, they are among the most likely to suffer cable or plug damage.
Movable and transportable equipment
These are heavier items that are not fixed in place but can be moved, often with wheels or handles. Examples include mobile heaters, floor-cleaning machines, and trolley-mounted equipment.
Hand-held equipment
Tools and devices designed to be held during use, such as power drills, hair dryers, and similar appliances, need particular attention because a fault is passed directly to the user’s hands.
Stationary equipment
Items that stay in one place but are still connected by a plug and cable, such as fridges, microwaves, and washing machines, are generally included. They are not carried around, but their leads can still be damaged by being trapped, pulled, or exposed to moisture and heat.
Information technology and office equipment
Computers, monitors, printers, chargers, power supplies, extension leads, and multi-way adapters are all commonly included. Extension leads and adapters are frequently overlooked, yet they are among the most heavily used items in an office or home workspace.
Fixed appliances with a flexible cable
Some items are wired into the building but still connect through a flexible cable, such as hand dryers, wall-mounted heaters, or certain lighting units. These are often included in a PAT programme, even though they are not portable in the everyday sense.
What Usually Falls Outside PAT Testing?
Not everything with electricity running through it belongs in a PAT schedule.
- Fixed wiring installation. Sockets, switches, lighting circuits, and distribution boards are part of the building’s electrical installation and are covered by a separate inspection and testing regime.
- Battery-only devices. Equipment that runs entirely on batteries and is never charged from the mains is generally outside the scope.
- Equipment under a separate maintenance programme. Some specialist equipment is inspected and tested under its own dedicated routine, which may already meet the safety duty.
- Newly purchased items. New equipment still needs to be visually checked, registered, and brought into the schedule, even if a formal electrical test is not carried out straight away.
How Often Does Equipment Need Testing?
There is no single rule that applies to every appliance. Frequency should be based on a risk assessment, and that assessment depends on several practical factors:
- Type of equipment. Hand-held tools and high-power appliances carry more risk than a desk lamp.
- Likelihood of damage. Items that are moved, dropped, or knocked are more likely to develop faults.
- Environment. Dust, moisture, heat, vibration, and outdoor use all increase wear.
- Who uses it. Equipment used by the public, by children, or by untrained people needs closer attention.
- Manufacturer guidance. Some makers specify inspection intervals that should be followed.
- Previous results. A history of faults or repairs suggests the item, or the way it is used, needs more frequent checks.
As a general principle, low-risk items in a clean, low-risk setting may go long periods between formal tests, with regular user checks in between. High-risk equipment in demanding environments may need testing several times a year.
How to Decide What Needs Testing: Step by Step
- Create an inventory. List every item that has a plug and a flexible cable, including extension leads and adapters.
- Group items by type and risk. Separate low-risk desk equipment from high-risk tools and appliances.
- Choose the level of check. Decide whether each group needs user checks, a formal visual inspection, or a combined inspection and electrical test.
- Set a frequency. Assign an interval to each group based on the risk factors above.
- Label and record. Mark tested items and log the result, the date, and the next due date.
- Review regularly. Adjust intervals when equipment, usage, or the environment changes.
What Happens During a PAT Test?
A full check usually has two parts. The visual inspection looks for cuts in the cable, damaged plugs, cracked casing, signs of overheating, incorrect fuses, and loose connections. The electrical tests then measure things such as:
- Earth continuity – confirming that the safety earth connection is intact on equipment that relies on it.
- Insulation resistance – checking that current cannot leak through damaged insulation.
- Polarity and wiring – making sure the plug is wired correctly.
- Functional check – confirming the item still works as intended.
Equipment described as double insulated does not rely on an earth connection, so it is tested differently and does not receive an earth continuity check.
Records and Documentation
Good records are as important as the tests themselves. A simple register should include the item, its location, the date of the last check, the result, who carried it out, and when the next check is due. Records show that a genuine maintenance system is in place, help spot repeat offenders, and make it easy to prove that faulty items were removed from use.
Common Misconceptions
- “Every appliance must be PAT tested every year.” The duty is to maintain equipment safely; the interval should reflect risk.
- “New equipment never needs checking.” New items should still be inspected and added to the register.
- “Only portable items count.” Movable, stationary, and some fixed appliances are also included.
- “Once tested, always safe.” Damage can happen the day after a test, which is why user checks matter.
- “The sticker is the point.” The sticker is simply a record; the inspection and testing are what keep people safe.
Conclusion
PAT testing requirements are not about hitting a fixed annual deadline for every plug in a building. They are about identifying which electrical equipment is used, how likely it is to become damaged, and putting a sensible system of inspection and testing in place to match that risk. Start with a complete inventory, group items by risk, set realistic intervals, and keep clear records of every check.
Handled that way, PAT testing becomes a straightforward part of routine maintenance rather than a confusing paperwork exercise. If you found this guide useful, explore more practical home, workplace, and safety topics to keep your everyday decisions simple and well informed.