A failed kettle in the staff kitchen and a hidden fault in the building’s electrical installation are not the same risk, and they are not checked in the same way. That is where PAT testing vs fixed wiring often causes confusion for duty holders. Many businesses assume one covers the other, only to find they have gaps in their compliance arrangements.
For offices, schools, healthcare settings, warehouses and multi-site estates, the distinction matters. Portable Appliance Testing focuses on electrical items that plug in and move, while fixed wiring inspection looks at the installation itself – the circuits, distribution boards, sockets, switches and hard-wired systems that supply power throughout the premises. Both support electrical safety, but they serve different purposes.
What PAT testing covers
PAT testing is concerned with portable electrical equipment and, in many cases, moveable or hand-held items used by staff, visitors or contractors. That can include computers, monitors, kettles, extension leads, printers, floor cleaners, chargers and workshop tools. The aim is to identify visible damage, wear, incorrect wiring, deterioration and electrical faults that could create a risk of shock or fire.
A proper PAT programme is not just a sticker exercise. It should combine a visual inspection with electrical testing where appropriate, along with clear records and practical advice on failed items. In many workplaces, visual checks identify a high proportion of problems before instrument testing even starts. Cracked plugs, damaged flexes and overloaded adaptors are common examples.
The frequency of PAT testing depends on the type of equipment, how often it is used, who uses it and the environment it operates in. A drill on a construction-related site will usually need closer attention than a monitor sitting undisturbed on a desk. That is why a risk-based approach matters more than applying the same interval to every item.
What fixed wiring inspection covers
Fixed wiring inspection, often referred to as an Electrical Installation Condition Report or EICR, assesses the safety and condition of the electrical installation within the building. This includes consumer units or distribution boards, circuits, earthing and bonding, socket outlets, lighting systems and hard-wired equipment.
Where PAT testing looks at appliances connected to the supply, fixed wiring inspection looks at the supply route itself. It is designed to identify issues such as overloaded circuits, deterioration, poor earthing, damage, non-compliances and defects that could lead to electric shock, overheating or fire.
This is a more involved inspection than appliance testing. It may require isolation, circuit testing and closer assessment of the installation against current standards. For that reason, it needs proper planning to keep disruption under control, especially on occupied sites such as schools, care settings and busy commercial premises.
PAT testing vs fixed wiring – the key difference
The simplest way to view PAT testing vs fixed wiring is this: PAT checks the equipment people plug in, while fixed wiring checks the electrical infrastructure they plug it into.
That distinction sounds straightforward, but in practice the two are often blurred. A business might have an up-to-date PAT register and assume its electrical safety duties are covered, even though the installation has not been inspected for years. Equally, a recent EICR does not remove the need to manage risks from portable appliances.
One does not replace the other. They address different parts of the electrical risk profile within a premises, and both may be needed to show that reasonable steps are being taken.
Is either one a legal requirement?
The legal position is often misunderstood. UK law generally requires employers, landlords and duty holders to maintain electrical systems and equipment so they do not present danger. That duty sits across regulations relating to health and safety and electricity at work. What the law does not usually do is prescribe PAT testing at a fixed annual interval for every item in every workplace.
Instead, the expectation is that electrical equipment and installations are maintained in a safe condition. PAT testing is a recognised way to help meet that duty for portable appliances. Fixed wiring inspection is a recognised way to assess the safety of the installation. If an incident occurs, the question is likely to be whether you had a sensible inspection and maintenance regime in place, not whether you bought the cheapest annual service.
That is why businesses benefit from advice based on use, environment and site risk rather than assumptions. A low-risk office and a high-use workshop should not be treated as identical.
How often should each be done?
There is no single answer that suits every site. PAT testing intervals should be based on risk. Equipment used frequently, moved regularly or exposed to harsher conditions will usually need more regular inspection. In lower-risk environments, some items may need less frequent formal testing, supported by routine user checks.
Fixed wiring inspection intervals are also shaped by the type of premises and how the installation is used. Commercial sites, industrial settings, schools and rented properties can all have different expectations and risk factors. Previous inspection findings also matter. If earlier reports identified deterioration or coded observations, a shorter interval may be appropriate.
The practical point is that testing should be planned, documented and reviewed. Leaving it until a certificate expires is not a strong strategy if the site conditions have changed or equipment use has increased.
Why businesses get caught out
The most common issue is treating compliance as a single task instead of a managed process. A business may arrange PAT testing because staff can see the appliances every day, but forget that ageing circuits, older distribution boards or damaged socket outlets present a separate risk in the background.
Another issue is inherited assumptions. New facilities managers often take over sites where testing intervals were set years ago and never revisited. That can mean over-testing low-risk equipment, under-testing high-risk items, or missing fixed wiring inspections altogether.
Multi-site organisations face an added challenge. Records may be inconsistent, asset lists incomplete and local practices different from one building to another. In those cases, a structured programme with clear reporting is far more useful than isolated visits with no wider planning.
Choosing the right approach for your premises
For most organisations, the right answer is not PAT or fixed wiring. It is both, managed properly and timed sensibly. The detail depends on the premises.
In a straightforward office, PAT testing may focus on IT equipment, kitchen appliances and extension leads, while fixed wiring inspection follows the recommended interval for the installation. In a school, there may be a broader range of equipment, from classroom devices to cleaning machinery and catering appliances, alongside the need to schedule work around term time and safeguarding requirements. In healthcare or supported living settings, disruption control becomes even more important because testing has to work around service users, clinical activity and access restrictions.
A competent provider should be able to assess the site, explain what is actually needed and plan the work with minimal interference to day-to-day operations. That includes identifying out-of-hours requirements where necessary, confirming what needs isolating and making sure reporting is clear enough for audit and remedial follow-up.
What good compliance support looks like
The quality of the service matters as much as the test itself. Reliable electrical safety support should start with practical discussion before the job, not guesswork on arrival. On some sites, a pre-visit survey makes sense, especially where access is restricted, departments operate different hours or there are specialist areas to consider.
Clear engineer credentials also matter. Businesses should expect qualified personnel, professional conduct on site and reporting that helps them act on findings rather than file them away unread. For settings with children, vulnerable adults or secure operations, DBS-cleared engineers provide additional reassurance.
At Janus Safety Solutions, that planning-led approach is central because compliance work needs to be thorough without becoming disruptive. For busy organisations, that balance is often the difference between a service that helps and one that creates operational headaches.
The real question to ask
If you are comparing PAT testing vs fixed wiring, the real question is not which one you need. It is whether your premises, equipment and inspection records together show that electrical risks are being managed properly.
A portable appliance can fail even when the installation is sound. An installation can become unsafe even when every plug-in item has a current test label. Looking at both gives you a more accurate picture of risk, a stronger compliance position and fewer surprises when audits, insurers or incident investigations ask for evidence.
If there is uncertainty around what your site requires, the sensible next step is to review the equipment, the installation history and the way the building is used. Good compliance should feel organised, proportionate and easy to manage – not like a last-minute scramble every time a certificate is due.