PAT testing

What PAT testing involves

Each item is given a formal visual inspection — the plug, lead and casing — followed by electrical tests appropriate to the type of equipment. Those include insulation resistance and, for earthed (Class I) appliances, earth continuity. Extension leads and multi-way adaptors are checked too.

Typical items include computers and monitors, printers, kettles, microwaves, power tools, chargers, heaters, lamps and extension leads.

Is it a legal requirement?

Not in the way it's often described. The law — including the Electricity at Work Regulations 1989 — requires employers to keep electrical equipment in a safe condition, but it doesn't say that every appliance must be tested every year. PAT testing is a practical, well-recognised way to show equipment is being maintained, and a clear record helps with insurance and inspections.

Landlords who supply electrical appliances with a property have a duty to make sure they're safe, and PAT testing is a common way to do that.

How often?

It depends on the type of equipment and how it's used. A desktop computer in an office needs far less attention than a power tool on a building site or a kettle in a busy staff kitchen. The Health and Safety Executive's guidance, Maintaining portable electric equipment in low-risk environments, is a good starting point, and we'll suggest sensible intervals for your equipment.

What you receive

• A pass or fail label on every item tested.
• A register listing each item, its location and its results.
• A note of any failures, with the reason and what we'd recommend.

We can work around your opening hours to keep disruption to a minimum. To quote, it helps to know roughly how many items you have and how many sites are involved.