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What’s the Difference Between PAT and Fixed Wire Testing?

Fixed Wire Testing, formally known as Periodic Inspection and Testing is very different from PAT Testing (portable appliance testing).

The two require very different tests, are different functions and require a different set of qualifications in order to carry them out.

Whilst PAT testing covers the testing of appliances such as freezers, coffee makers, fridges, laptops, printers, etc, fixed wire testing covers the testing of an electrical installation’s main electrical wiring system.

Is Fixed Wire Testing a legal requirement?

Your electrical safety is critical, therefore the law states that in order to comply with the Electrical Safety at Work Act 1989, you must be able to prove that your commercial building is safe and compliant. This requires an Electrical Installation Condition Report (EICR).

Is PAT Testing a legal requirement?

The Electricity at Work Regulations 1989 require that any electrical equipment that has the potential to cause injury, is maintained in a safe condition. To this day, there is no better, more efficient method to ensure that all electrical equipment in your workplace is safe and fit for use.

How long do the certifications last?

For fixed wire tests you are legally required to get tests done every 5 years in commercial premises, however in some circumstances we would recommend you have a re-test sooner than this. This period between tests will vary dependent on the type of premises.

For PAT testing there are no legal requirements that specifically say how often you should get your PAT Testing certificate renewed, we recommend that you get your portable equipment tested a minimum of every 2 years to ensure it’s compliant and safe for use. For more high risk items we recommend yearly testing.

How are tests passed?

In order to pass fixed wire testing you will need to pass a certain amount of requirement s and action any flagged electrical issues. These issues are coded in severity ranging from C1 ‘Danger Present’ to C3 ‘Improvement Recommended’, these are reviewed regularly and in line with the standards and guidance all electrical engineers should work to.

For PAT testing equipment will either receive a ‘Pass’ or ‘Fail’ and tests differ slightly dependent on the piece of equipment.

Can Protest ES Ltd complete both PAT and fixed wire testing?

Of course we can! Our qualified engineers are able to complete both PAT testing and Fixed Wire Testing, bringing you dedicated quality and efficiency every time.

Our team of fully qualified engineers are located across the UK. The team can also provide Emergency Light Testing, Fire Alarm Testing, Fire Extinguisher Servicing and we have highly skilled engineers who can repair faulty electrical.

Would you like to know more about how Protest ES Ltd can help protect your business, staff, and visitors, thus keeping you safe and legally compliant with the latest regulations?

Please do not hesitate to contact us, by calling this number: 01604 696113 today. Or contact us via email:


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Since 2003 we have been delivering the highest quality in Electrical Inspection & Testing to clients nationwide.

Want to know more? Get in touch now!

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