PAT Testing Regulations

PAT Testing Regulations: A Comprehensive Guide

Portable appliance testing (PAT testing) is one of the ways employers meet their health and safety obligations for electrical equipment.

PAT testing helps keep a workplace free from electrical risks and hazards. This matters most in higher-risk environments — construction sites, workshops, kitchens, anywhere power tools and hard use are the norm.

Several pieces of UK legislation sit behind PAT testing, along with one industry code of practice that does most of the practical work. We’ll go through each of them in this guide to PAT testing regulations.

Last reviewed: September 2026.

Regulatory Compliance

Currently, no UK legislation makes PAT testing a legal requirement. There is no law that says “you must PAT test”, and no law that sets an interval.

What the law does require is that electrical equipment which can cause danger is maintained in a safe condition. As the HSE puts it, the law does not say how you must do this or how often — that is for you to decide on the basis of risk.

The UK legislation that applies is:

• Health and Safety at Work etc. Act 1974 — the overarching duty to ensure, so far as is reasonably practicable, the health and safety of employees and others affected by the work.
• Electricity at Work Regulations 1989 — the specific electrical safety duties, including the duty to maintain electrical systems to prevent danger.
• Provision and Use of Work Equipment Regulations 1998 (PUWER) — work equipment must be suitable, maintained in efficient working order, and inspected where safety depends on installation conditions.
• Management of Health and Safety at Work Regulations 1999 — the duty to carry out a suitable and sufficient risk assessment, which is where your inspection and testing regime actually comes from.

Alongside these sits the IET Code of Practice for In-service Inspection and Testing of Electrical Equipment, 5th Edition (2020) — not law, but the document the industry works to. More on that below.

Employers’ Legal Obligations

These regulations place obligations on employers to maintain health and safety in the workplace, which in practice means eliminating or minimising electrical defects.

What starts as a minor fault — a damaged lead, a loose cord grip, a cracked casing — can become an electric shock or a fire. Inspection and testing is how those faults get found before they cause harm.

PAT testing is one method employers can use to demonstrate that electrical equipment is being maintained.

The duty is broader than most people assume. It covers any electrical equipment your employees use at work, including equipment they own themselves and bring in. Where equipment is leased — a photocopier, for example — or provided by a contractor, you have a joint responsibility for maintaining it. Equipment both provided and used by a contractor is their responsibility.

In meeting this obligation, employers must take a risk-based approach, considering the type of equipment, how it is constructed, how it is used, and the environment it is used in.

For example, a power drill on a busy construction site needs inspecting and testing far more often than a vending machine in a coffee shop. That is not a matter of opinion — it is the whole basis on which intervals are set.

Safety At Work Act 1974

The Health and Safety at Work etc. Act 1974 is the foundation of UK workplace health and safety law.

Section 2 places a general duty on employers to ensure, so far as is reasonably practicable, the health, safety and welfare at work of their employees. Section 3 extends a similar duty to people who are not employees but may be affected — visitors, customers, contractors.

Maintaining electrical equipment in a safe condition is part of discharging those duties. Inspection and testing is how you demonstrate that you have.

It is worth being precise about what “PAT testing” actually covers, because three distinct activities get bundled under the label:

• User checks — a quick look by the person about to use the equipment. No records required, no formal competence needed, but the most frequent line of defence.
• Formal visual inspection — a structured check by someone with basic electrical knowledge, including opening a rewireable plug where possible. This picks up the large majority of faults.
• Combined inspection and testing — the formal visual inspection plus instrument tests (earth continuity, insulation resistance and so on), carried out by a competent person with the right equipment and the ability to interpret the results.

Not every item needs all three. Deciding which item gets what, and how often, is the substance of a PAT regime.

Electricity at Work Regulations 1989

The Electricity at Work Regulations 1989 are the most directly relevant piece of legislation.

Regulation 4(2) is the key provision: “As may be necessary to prevent danger, all systems shall be maintained so as to prevent, so far as is reasonably practicable, such danger.”

That single sentence is the legal basis for in-service inspection and testing. Note what it doesn’t say: it doesn’t say how, and it doesn’t say when. Those are for the duty holder — the employer or whoever controls the system — to determine.

The Regulations apply to electrical systems of all kinds, whether portable equipment or fixed installation. They also place duties on employees to co-operate and to work safely — which includes sensible practice such as not overloading extension leads and not continuing to use damaged equipment.

Inspection and testing helps spot the defects that matter: failed earth continuity on a Class I appliance, deteriorating insulation resistance, incorrect polarity, damaged flexes and poor terminations.

Safety Regulations for PAT Testing

Various work equipment regulations create legal duties for employers and employees, and inspection and testing is one of the effective ways of meeting them.

Although there is no legal requirement to PAT test specifically, PAT testing safety should be standard practice, especially in higher-risk environments.

Electrical Safety Regulations

The Provision and Use of Work Equipment Regulations 1998 (PUWER) is a crucial piece of legislation here.

PUWER requires employers to ensure work equipment is suitable for its purpose, maintained in an efficient state and in good repair, and inspected where its safety depends on the conditions of installation or where it is exposed to conditions causing deterioration.

PUWER doesn’t mention PAT testing by name. But a documented programme of user checks, formal visual inspections and, where appropriate, combined inspection and testing is a clear and defensible way to demonstrate compliance with it.

The IET Code of Practice — the Operative Document

If there is one document that governs how PAT testing is actually done in the UK, it is the IET Code of Practice for In-service Inspection and Testing of Electrical Equipment, 5th Edition (2020).

The Code of Practice is not law. It is guidance — but it is the guidance that duty holders, insurers, competent persons and training providers all work to, and it is what a court or an HSE inspector would expect a competent organisation to have followed.

The 5th Edition matters for a few reasons:

• It sets out a risk-based approach to determining what needs inspecting and testing, and how often. It explicitly moves the industry away from blanket fixed intervals.
• It covers electrical safety management as a system, not just the act of testing an individual item.
• It gives guidance on how to conduct the risk assessment that sets your intervals.
• It updates acceptable test result limits and introduces a hierarchy of tests, so testers work through them in a defined order.
• It incorporates ES1 and ES2 energy source classifications, reflecting changes in product standards.

The 5th Edition (2020) remains the current edition. Anyone carrying out testing, or managing someone who does, should be working to it.

Fire Safety Regulations

Faulty appliances and damaged flexes are a recognised cause of workplace fires. When a fire happens, companies suffer losses that some never recover from.

Fire safety duties sit under the Regulatory Reform (Fire Safety) Order 2005 in England and Wales, the Fire (Scotland) Act 2005 and associated regulations in Scotland, and the Fire and Rescue Services (Northern Ireland) Order 2006. All of them require the responsible person to carry out a fire risk assessment and take general fire precautions — and electrical ignition sources fall squarely within that.

Inspection and testing supports this in practical ways. It identifies overloaded extension leads and adaptors, deteriorating connections that heat up under load, damaged flexes, and equipment being used beyond its rating or outside the manufacturer’s instructions.

It also means employees know the condition of the equipment they’re using, and are more likely to report a problem rather than work around it.

Health and Safety Regulations

Underpinning everything above is the Management of Health and Safety at Work Regulations 1999.

Regulation 3 requires every employer to make a suitable and sufficient assessment of the risks to the health and safety of employees and others. This is the regulation that actually generates your inspection and testing schedule: you assess the risk from the electrical equipment you have, in the environment you use it in, and the schedule falls out of that assessment.

It also requires that assessment to be reviewed if it is no longer valid or circumstances change — new equipment, a change of premises, a change in how equipment is used, or a pattern of faults emerging from your own inspection records.

Where testing is carried out, it should be done by a competent person, and may include earth continuity, insulation resistance, polarity and functional checks as appropriate to the equipment class.

Benefits of Adhering to Regulations

There are real benefits to a properly run inspection and testing regime, for employers and employees alike.

1: Reduces the Risk of Electrical Accidents

Accidents can happen anytime, especially in a high-risk working environment.

The likelihood is greater where risk assessments haven’t been done. The consequences can be an electric shock or a fire.

A visual inspection catches most faults, but not all. Loss of earth continuity in a Class I appliance, or degraded insulation, will not show up to the eye — those require instrument testing.

Ask about the different types of PAT testing to understand what suits your equipment.

2: Helps You With Insurance Requirements

Insurance is one of the first things company owners arrange, and policies commonly require the insured to comply with statutory duties and maintain equipment properly.

Where a fire or injury claim is made, an insurer will look at whether equipment was being maintained.

Keeping evidence protects you. Make sure you have:

• Records of inspections and tests carried out
• Labelling showing the date and result
• PAT testing records retained and available

There is no legal requirement to keep records or label equipment, but the HSE recommends both — and in practice, records are how you demonstrate a maintenance regime exists. Requirements vary from insurer to insurer, so check the wording of your own policy rather than assuming a standard applies.

3: Boosts the Lifespan of Appliances

Portable electrical appliances wear out through normal use. That’s expected.

But underlying problems — a deteriorating flex, a loose terminal, a failing cord grip — shorten equipment life considerably and cause faults that are expensive to deal with later.

Regular inspection catches those early, when a lead or a plug can be replaced instead of the whole item.

How often you inspect and test is not a fixed number. It depends on the class of equipment, how it’s constructed, how it’s used and where. Some equipment needs no testing at all; some low-risk items sit on multi-year cycles; hand-held equipment on a construction site needs far more frequent attention. See the interval guidance in the FAQ below.

4: Improves Your Business

Simple electrical maintenance supports business efficiency.

Equipment that works properly keeps people productive, and reduces the disruption of unexpected failures and incident investigations.

Employers spend less on emergency replacement, and can plan expenditure instead — including investing in training someone in-house.

Frequently Asked Questions (FAQs)

To help you understand the basics, we’ve answered some of the questions we’re asked most often.

How Often Is PAT Testing Required?

There is no legally required PAT testing interval. No UK regulation sets one, and any provider quoting a blanket “annual PAT test” as a legal requirement is wrong.

Instead, the interval is set by the duty holder’s risk assessment, and reviewed in light of what that assessment produces over time. The factors to weigh are:

• Equipment class — Class I (earthed) equipment relies on its earth connection, so it generally needs testing. Class II (double insulated) equipment usually needs inspection but not testing.
• Equipment type — hand-held equipment takes more abuse than something that sits on a desk and is never moved.
• The environment — an office is not a construction site, a commercial kitchen or a workshop.
• Frequency and manner of use — daily hard use versus occasional light use.
• Who uses it — equipment used by the public, or by people unfamiliar with it, warrants more frequent checks.
• Your own fault history — if inspections keep finding nothing, you may be able to extend intervals. If faults keep appearing, shorten them.

One practical point worth knowing: the person carrying out the test should not decide when the next test is due. That decision belongs to the duty holder, on a risk assessment basis. A testing contractor who applies “1 year” stickers to everything by default is not doing a risk assessment on your behalf.

Indicative intervals

The table below gives indicative starting points only. These are guidance figures for lower-risk environments drawn from HSE leaflet INDG236(rev3) Table 1; the IET Code of Practice 5th Edition gives fuller guidance covering higher-risk environments such as construction sites, industrial premises and equipment used by the public. They are not legal requirements and they are not a substitute for your own risk assessment.

Equipment / environment	User check	Formal visual inspection	Combined inspection and testing
Battery-operated (under 40 V)	No	No	No
Extra-low voltage (under 50 V AC) — e.g. telephone equipment, low-voltage desk lights	No	No	No
Desktop computers, monitors	No	Yes, 2–4 years	No if double insulated, otherwise up to 5 years
Photocopiers, fax machines — not hand-held, rarely moved	No	Yes, 2–4 years	No if double insulated, otherwise up to 5 years
Class II (double insulated), not hand-held, moved occasionally — e.g. fans, table lamps	No	Yes, 2–4 years	No
Class II (double insulated), hand-held — e.g. some floor cleaners, some kitchen equipment	Yes	Yes, 6 months – 1 year	No
Class I (earthed) — e.g. kettles, some floor cleaners, some kitchen equipment, irons	Yes	Yes, 6 months – 1 year	Yes, 1–2 years
Leads, plugs, mains extension leads and battery-charging equipment	Yes	Yes, 6 months – 4 years, depending on the equipment it serves	Yes, 1–5 years, depending on the equipment it serves

Two notes on using this table. If you group equipment together for testing, apply the shortest interval in the group, not the longest. And higher-risk settings — construction, industrial, hire equipment, equipment used by the public — need considerably shorter intervals than anything shown here; refer to the IET Code of Practice for those.

What Equipment Will You Need for PAT Testing?

Different types of PAT testing equipment are available, from basic pass/fail units to fully downloading instruments that record results.

Whatever the instrument, the tests it performs are broadly the same, and which apply depends on the equipment class:

• Earth continuity — for Class I equipment, confirming a sound, low-resistance earth path
• Insulation resistance — confirming the insulation between live parts and the earthed casing is intact
• Polarity — on leads and rewireable plugs, confirming the conductors are on the correct terminals
• Functional check — confirming the equipment operates as intended
• Substitute or protective conductor current tests — where insulation resistance testing is not appropriate for the equipment

The instrument matters less than the person using it. Testing does not have to be carried out by an electrician, but it does require someone who knows how to use the instrument, knows which tests apply to which class of equipment, and can interpret the results against the limits in the Code of Practice.

Always ask a provider which tests they will carry out and what they will record.

How Much Does PAT Testing Cost?

There is no standard figure for how much PAT testing costs.

The cost varies with the service needed. Factors include:

• Electrical class and type of the appliances involved
• The environment where the equipment is used
• Type of PAT testing procedure required: user check, formal visual inspection or full combined inspection and testing
• Number of items to be covered
• Whether records, labelling and a report are included
• Type of PAT testers and level of competence required

Ask for a written quote setting out what is included.

Alternatively, you can have one of your own staff take a PAT testing course, which is often more economical for organisations with a lot of equipment — and means you keep the knowledge in-house.

Conclusion

PAT testing is not a legal requirement in itself. Maintaining electrical equipment so that it does not cause danger is — under the Electricity at Work Regulations 1989, PUWER 1998 and the Health and Safety at Work etc. Act 1974.

The way to meet that duty is a risk-based regime built on your own assessment: user checks, formal visual inspections, and combined inspection and testing where the equipment class and environment call for it, at intervals you have justified and can review. The IET Code of Practice, 5th Edition (2020), is the document to work to.

What it is not is a date in the diary once a year. Anyone who tells you otherwise is selling you a schedule rather than a safety regime.

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