How Often Should PAT Testing Be Done? Risk Decides

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There is no legal interval, so the honest answer is that frequency follows risk. A hand-held drill on a building site, a kettle in a quiet office and a server in a locked room do not need the same attention, and treating them alike either wastes money or misses the equipment most likely to hurt somebody. HSE guidance sets out suggested intervals rather than rules, and expects the duty-holder to justify their own.

What decides the interval

Four things. The type of equipment and whether it is class I or class II. The environment, because damp, dust, heat and vehicles all shorten a flex's life. How the equipment is used and moved, since portable and hand-held equipment fails far more than a fixed appliance. And the history of the equipment, because a type that keeps failing is telling you something.

The three levels of check

User checks before use, which cost nothing and catch most damage. Formal visual inspections by somebody trained, at intervals. And combined inspection and test with an instrument, least often of the three. Guidance builds a regime out of all three rather than relying on the annual visit that people mean when they say PAT testing.

Suggested intervals, and what they are not

HSE guidance offers suggested initial intervals by equipment type and environment, from months for hand-held equipment in harsh conditions to years for stationary equipment in an office. They are starting points to be reviewed against your own failure record, not a schedule the law hands down, and a regime that never changes has not been reviewed.

How long a test result stays meaningful

Until the equipment is damaged, which can be the same afternoon. A label with a date on it says when the item was last inspected, not that it is safe now. That is the argument for user checks between formal inspections and against reading the label as a guarantee.

How long the visit itself takes

A tester works through items at a steady rate once set up, so the visit length follows the item count more than anything else. Preparation is what changes it: equipment gathered in one place, access to sockets, and somebody who can say what is used where. A site walked in advance is tested faster on the day.

Questions people ask about how often should pat testing be done

How often should PAT testing be done by law?

The law sets no interval. The duty is to maintain equipment so as to prevent danger, and the frequency is for the duty-holder to justify from the risk.

Is annual PAT testing sensible for an office?

Often not. HSE guidance suggests longer intervals for stationary equipment in low-risk environments, with user checks and formal visual inspections in between.

How long is a PAT test valid for?

There is no validity period. The label records when the item was last inspected, and damage after that date is what user checks are for.

How long does a PAT test take?

Each item takes a minute or two once the tester is set up, so the visit follows the item count. Gathering equipment beforehand shortens it noticeably.