How Often Should PAT Testing Be Carried Out?

Is there a legal requirement to PAT test every year?

No. There is no law that requires PAT testing to be carried out annually or at any other fixed interval. The Health and Safety at Work Act 1974 and the Electricity at Work Regulations 1989 require employers to maintain electrical equipment in a safe condition, but neither piece of legislation specifies how often testing must take place.

The frequency of testing is a matter of risk assessment, not a fixed calendar rule.

What does the HSE say?

The Health and Safety Executive (HSE) is clear that the decision on testing frequency should be based on the type of equipment, how it is used, and the environment in which it operates. A desktop computer in a low-risk office environment does not need to be tested as often as a power tool on a construction site.

The HSE guidance states that a formal inspection and test may not be necessary at all for some low-risk equipment, provided a regular visual check is carried out by a competent person.

The IET Code of Practice

The Institution of Engineering and Technology (IET) Code of Practice for In-Service Inspection and Testing of Electrical Equipment — now in its 5th edition — provides the most widely referenced guidance on testing intervals. It sets out suggested frequencies based on equipment type and environment:

• Construction sites: Class I equipment every 3 months; extension leads every month
• Industrial and manufacturing: Class I equipment every 6–12 months
• Schools and colleges: Class I equipment every 12 months; IT equipment every 4 years
• Offices and low-risk environments: IT equipment every 4–5 years; Class I equipment every 1–2 years
• Hotels and hospitality: Class I equipment every 12 months; IT equipment every 2 years
• Care homes and NHS settings: Class I equipment every 12 months in line with HTM 06-01

These are suggested intervals, not legal requirements. A documented risk assessment may justify longer or shorter intervals.

What factors affect testing frequency?

When carrying out a risk assessment, the following factors should be considered:

Equipment type and class. Class I equipment (earthed appliances such as kettles, toasters, and floor-standing equipment) carries a higher risk than Class II double-insulated equipment. Class I appliances generally require more frequent testing.

Environment. Equipment used outdoors, in wet conditions, or on construction sites is exposed to greater risk of damage and requires more frequent inspection. Office equipment in a controlled environment carries a lower risk.

How the equipment is used. Equipment that is moved frequently, subject to rough handling, or used by multiple people is more likely to sustain damage than fixed equipment used by a single operator.

Age and condition. Older equipment or equipment with a history of faults may warrant more frequent inspection.

Previous test results. If equipment consistently passes with no issues, the interval may be extended. If faults are regularly found, the interval should be shortened.

Can I extend or reduce the recommended intervals?

Yes. The IET guidance explicitly states that intervals should be reviewed in light of experience. If your records show that a particular class of equipment consistently passes without fault over several test cycles, it is reasonable to extend the interval. Conversely, if faults are being found regularly, the interval should be reduced.

Any decision to deviate from the suggested intervals should be documented as part of your risk assessment.

What counts as a visual check?

A visual inspection involves checking the equipment and its lead for obvious signs of damage: frayed or damaged cables, cracked or broken plugs, signs of overheating, damaged casings, or incorrect fuse ratings. Visual checks can be carried out by any competent person — they do not need to be a qualified electrician.

For low-risk equipment in stable environments, a regular visual check combined with a less frequent formal test is often sufficient to meet the duty of care under the Electricity at Work Regulations.

Sector-specific guidance

Certain sectors have additional requirements or guidance that sits alongside the IET Code of Practice:

• NHS and care homes: HTM 06-01 sets out specific requirements for medical and non-medical electrical equipment in healthcare settings. Annual testing of Class I equipment is standard practice.
• Schools and colleges: The IET recommends annual testing for Class I equipment and 4-year intervals for IT equipment, though many schools test IT equipment more frequently given the volume of use. See our full guide to what appliances need PAT testing in a school.
• Airports and transport hubs: Equipment in public-facing and operational areas is typically tested annually given the high-use environment and duty of care to passengers and staff. See our airport PAT testing compliance guide.
• Offices: Low-risk environments may justify 2–4 year intervals for IT equipment, provided visual checks are carried out regularly.
• Multi-site operations: Organisations with multiple premises should apply a consistent risk-based approach across all sites, with records maintained centrally.

Record keeping

Regardless of the interval chosen, maintaining accurate records is essential. Your test register should record the appliance description, asset number, location, date of test, test result, and the name of the person who carried out the test. These records are your evidence of compliance during HSE inspections, insurance assessments, and — in healthcare settings — CQC audits.

Summary

There is no legal requirement to test annually. The correct approach is a documented risk assessment that takes into account equipment type, environment, and use. The IET Code of Practice provides a sensible starting point for intervals, but those intervals should be reviewed in light of your own test history and operational circumstances.

If you are unsure what testing frequency is appropriate for your premises, contact Maritime Electrical Services for a no-obligation assessment. We cover Kent, London, Essex, Surrey, West Sussex, East Sussex, and Hertfordshire.