What Equipment Do I Need for PAT Testing?

Choosing equipment for portable appliance testing starts with defining the work—not buying every tester and accessory available. The right kit depends on the electrical equipment involved, its construction and connection method, the conditions in which it is used, and the competence of the person carrying out the work.

In everyday language, “PAT testing” usually means a combination of user checks, formal visual inspection and, where justified, electrical testing of in-service equipment. It is not one universal test, and not every item needs the same procedure.

This is an educational summary of current guidance for workplaces in Great Britain. Northern Ireland has separate workplace safety legislation and enforcement arrangements. This guide does not qualify someone to undertake electrical work or prescribe a test sequence for a particular appliance. A competent person should make equipment-specific decisions using the appliance and test-instrument manufacturers’ instructions and recognised technical guidance.

Is PAT testing a legal requirement?

Great Britain’s legislation does not impose a universal procedure called “PAT testing”, nor does it require every appliance to receive an annual electrical test. Regulation 4(2) of the Electricity at Work Regulations 1989 requires systems to be maintained, so far as reasonably practicable, to prevent danger.

The Health and Safety Executive (HSE) explains in its portable appliance testing FAQs that the law does not require all portable electrical appliances to be tested or prescribe testing intervals. A proportionate regime may combine user checks, formal visual inspections, maintenance and electrical testing according to risk.

PAT is therefore one possible part of an electrical maintenance system, not a compulsory annual ritual for every business or item. Other duties, sector rules, tenancy arrangements or contracts may also apply. Dutyholders should establish the requirements relevant to their premises, equipment and jurisdiction rather than relying on a generic PAT label.

For a broader introduction, read what PAT testing is.

Competence comes before equipment

HSE’s Maintaining portable electric equipment in low-risk environments guidance explains that maintenance work should be carried out by someone with the knowledge, training and experience needed for the task. A user check may require straightforward instruction, whereas combined inspection and testing requires greater technical knowledge and practical ability.

The person undertaking formal inspection and testing must be able to identify the equipment and its protective construction, recognise defects, select a suitable method, use the instrument safely and interpret the result. Buying a multifunction tester does not by itself establish competence.

Before selecting a kit, define:

• the types of appliances, leads, plugs and connectors involved;
• whether equipment is portable, movable, stationary, fixed or built in;
• the protective construction and available manufacturer information;
• the environment, frequency of use and likelihood of damage;
• whether any powered or leakage-current assessment is appropriate;
• the number of assets and records the organisation must manage; and
• which tasks must be referred to an electrical professional competent for that work.

Repairs, dismantling, safe isolation and work on hard-wired equipment may require different or higher competence. Keep those tasks outside the scope of a routine PAT programme unless the people, procedures and equipment are demonstrably suitable.

Inspection usually starts without an electrical tester

A visual inspection can identify many common defects. Depending on the item, this may include checking the plug, flexible cable, cord grip, connector, enclosure, switches and signs of overheating, contamination, impact or unsuitable use. Rating plates, electrical class symbols and manufacturer information help determine what further assessment is appropriate.

The item should be disconnected where the inspection or test procedure requires it. The work area should also be controlled so that nobody reconnects or uses suspect equipment unexpectedly.

Formal visual inspection does not mean routinely opening every appliance. A plug, cover or enclosure should be removed only where the maintenance procedure calls for it and the person is competent to isolate, inspect and reassemble the equipment safely. Observe manufacturer restrictions, warranties and equipment-specific hazards.

Understand protective construction before selecting tests

Equipment classes describe protective construction; they are not a scale from “most dangerous” to “least dangerous”. Do not assign a class from an appliance’s appearance or product name. Check its markings, connections and manufacturer documentation.

The IET’s fifth-edition Code of Practice is a published technical reference for detailed in-service test selection, methods and result interpretation. HSE’s HSG107 directs readers to the IET Code of Practice for fuller advice on testing and pass or fail criteria. Competent practitioners should use the current edition alongside appliance and instrument manufacturers’ instructions rather than treating the summaries below as test procedures.

Class I equipment

Class I equipment uses basic insulation and protective earthing. Its assessment may include protective-conductor continuity and an appropriate insulation-resistance or leakage-current method. The correct connections, test conditions, limits and interpretation depend on the item and applicable technical guidance.

Reliable contact with the relevant accessible conductive parts matters. A result can be misleading if a probe touches a painted, anodised or otherwise insulated surface, or if the wrong part is assessed.

Class II equipment

Class II equipment uses double or reinforced insulation and normally displays the square-within-a-square symbol. It does not rely on a protective-earth connection for safety, so an earth-continuity test is not applicable merely because a tester offers one.

Visual inspection is particularly important because damage to the enclosure can compromise the insulation system. Where an electrical test is appropriate, the method must suit the actual design and current technical and manufacturer guidance.

Class III equipment and external power supplies

Class III equipment is supplied at separated extra-low voltage and does not depend on a protective connection to earth. It still merits an appropriate visual check. Any mains-powered external power supply, detachable mains lead and connector should be identified and assessed according to its own construction.

A laptop demonstrates why product-name tables are unreliable: the computer operates from a low-voltage output, the external power supply may be Class I or Class II, and the detachable mains lead is another component. Lamps, drills, televisions and other products can also differ within the same category. Inspect the actual item rather than assuming its class.

Essential PAT testing equipment

1. Visual-inspection tools

Start with good lighting and a way to inspect markings and accessible components clearly. Depending on the workplace, useful items may include a torch, inspection mirror and magnifier. A suitable plug-opening tool can be relevant where inspection of a rewireable plug is within the person’s competence and documented procedure; it is not an invitation to dismantle an appliance.

2. A suitable PAT instrument

Many modern PAT instruments combine several functions, so separate continuity, insulation and leakage testers are not automatically necessary. Choose an instrument whose declared intended use covers the equipment and tests within the defined programme.

Depending on scope, available functions may include:

• protective-conductor continuity testing;
• insulation-resistance testing;
• protective-conductor, differential or substitute leakage assessment;
• touch-current assessment where appropriate;
• polarity and continuity checks for compatible leads; and
• result storage and transfer.

Having a function does not mean it should be applied to every item. Test selection, settings, connection methods and acceptance criteria must follow the current IET Code of Practice and the appliance and instrument manufacturers’ instructions. Sensitive electronic equipment, surge-protection components, filters and switching arrangements can affect which method is suitable. Do not apply a universal insulation-test voltage or substitute one test for another without competent justification.

3. Compatible leads, probes and adaptors

Use leads, clips, probes and adaptors approved or specified for the instrument and intended task. Check them before use and remove damaged accessories from service. Their ratings and design must be appropriate, and they should allow reliable contact without introducing avoidable danger.

4. A recording system

Records help identify assets, document defects, track repairs and inform future inspection intervals. The system could be a controlled paper register, spreadsheet, tester memory or asset-management platform. HSE does not generally require PAT labels or records in every circumstance, but sensible records can support an effective maintenance regime.

A useful record normally identifies the item and location, inspection date, outcome, defect or action, and person carrying out the work. Do not let a label replace the underlying inspection record or risk decision.

Test-dependent accessories

The following items are useful only when they match the equipment and procedures in scope:

• IEC and appliance-coupler adaptors: for compatible detachable leads and equipment connections.
• Extension-lead adaptors: for appropriate continuity, protective-conductor and polarity checks on compatible extension assemblies.
• Industrial or specialist adaptors: only where the tester, adaptor and procedure are designed for the relevant connector and electrical rating.
• Leakage-current capability: integrated into the tester or provided by appropriate separate equipment where the selected assessment requires it.
• Safe-isolation and lock-off equipment: where the task and safe system of work require them. Users need suitable training and correctly rated equipment.
• Equipment-specific fixtures: where specified by the appliance manufacturer or maintenance procedure.

A travel adaptor is not a universal PAT adaptor. Imported products, non-UK plugs and conversion devices should be assessed for their suitability and compliance rather than connected through an improvised arrangement merely to make testing possible.

Optional equipment for larger programmes

Workflow tools can save time, but they do not make a test safer or technically valid by themselves. Options include:

• barcode or QR-code scanners;
• label printers and durable asset labels;
• downloadable tester memory;
• USB or wireless result transfer;
• asset databases and compatible reporting systems; and
• approved spare leads, batteries and protective carrying cases.

Failed or suspect equipment should be clearly identified, withdrawn from use and controlled so that it cannot return to service before suitable repair, further assessment or disposal.

A practical equipment-selection matrix

Intended scope	Core equipment or functions	Useful options	Important boundary
Small office with standard plugs, detachable IEC leads and external power supplies	Visual-inspection kit; suitable tester covering the identified construction types; compatible probe and lead adaptors; recording method	Tester memory, spreadsheet export or label printer	Assess power supplies and detachable leads separately; do not assume all computer equipment has the same class
High-volume facilities programme	Suitable multifunction tester, approved adaptors, inspection tools and a controlled method for isolating defects	Barcode scanner, downloadable results, database integration and portable printer	Automation assists administration, not competence; sequences still require equipment-specific validation
Workshop or demanding environment	Equipment suitable for the intended connectors and conditions, relevant test functions, inspection tools and appropriate isolation controls	Protective case, asset tracking and approved spare leads	Harsh conditions may justify more frequent checks; repairs and fixed electrical work can require an electrical professional
Fixed or built-in equipment	Risk assessment and maintenance method selected for the item’s construction and connection	Asset records linked to planned maintenance	A conventional plug-in PAT test may be unsuitable; never improvise hard-wired work

This matrix intentionally gives no universal test settings or pass limits. Those decisions depend on the individual item, the current IET Code of Practice, manufacturer instructions and competent interpretation.

A useful mechanism: divide the kit into four layers

A practical way to avoid both under-buying and unnecessary expense is to divide a proposed kit into four layers:

1. Identify: lighting, magnification where needed, asset information and access to manufacturer documentation.
2. Inspect and measure: an instrument, probes, leads and adaptors that cover the defined equipment and selected methods.
3. Control: defect labels, withdrawal arrangements and any isolation equipment required by the safe system of work.
4. Record: a proportionate register, from a controlled spreadsheet to an integrated database.

For example, an office may need only standard plug and IEC-lead capability plus straightforward records. A facilities team managing thousands of mixed assets may justify scanners and automatic transfer. The second organisation needs a faster workflow, not necessarily more aggressive testing.

Portable, movable, stationary and fixed equipment

The word “portable” can obscure the wider maintenance duty. HSE guidance addresses electrical equipment more broadly, and risk does not disappear because an item is heavy or secured in place.

• Portable equipment can readily be moved and includes many hand-held appliances.
• Movable equipment can be moved for use, although it may be heavier.
• Stationary equipment is normally not moved during use.
• Fixed or built-in equipment is secured or incorporated into its location and may be permanently connected.

These descriptions do not dictate one testing method. A plug-connected stationary appliance may fit within an in-service inspection programme. A hard-wired towel rail, machine or built-in oven may require inspection and maintenance, but not a conventional plug-in PAT test. Accessing terminals, disconnecting fixed equipment or investigating the installation should be referred to a professional competent for that work.

How often should equipment be inspected or tested?

There is no universal annual interval, nor a general rule requiring every appliance to be tested after two years or every IT item after four. HSE’s PAT FAQs state that the law does not specify testing frequency. Its free HSG107 guidance on maintaining portable and transportable electrical equipment describes a risk-based maintenance approach.

A schedule should consider:

• the type and construction of the equipment;
• whether it is hand-held, portable, movable, stationary or fixed;
• how often and in what manner it is used;
• the likelihood of impact, moisture, heat, dust or cable damage;
• manufacturer recommendations;
• previous inspection, test, repair and defect records; and
• the users and working environment.

HSE guidance contains suggested initial intervals for certain environments and equipment categories, but these are not statutory deadlines. Dutyholders should use evidence from checks and maintenance history to shorten or extend intervals appropriately. User checks can also identify damage between formal inspections.

Checking and maintaining the tester

Follow the instrument manufacturer’s instructions for pre-use checks, functional verification, servicing and calibration. There is no defensible universal rule that every tester must be calibrated at exactly the same interval.

A proprietary check unit may help reveal unexpected changes between formal calibrations, but it does not automatically replace traceable calibration or the manufacturer’s requirements. Protect the tester from moisture and impact, inspect leads and connectors, and withdraw damaged accessories.

Do you need gloves, eye protection and hand tools?

Personal protective equipment should follow a task-specific risk assessment; it is not a universal shopping list for appliance inspection. Gloves do not make live work safe, and generic “electrical safety gloves” may be inappropriate for the task or voltage.

Live work should be avoided unless the conditions in regulation 14 of the Electricity at Work Regulations 1989 are satisfied. Eye protection or other PPE may be appropriate where a particular workplace hazard exists. Intrusive repair tools should be used only by someone competent and authorised to perform the repair; routine PAT guidance should not encourage untrained appliance dismantling.

Buying checklist

Before purchasing equipment, ask the supplier or manufacturer:

• Which test functions does the instrument provide, and what is its intended use?
• Can methods and settings be selected for the actual equipment in scope?
• Which connectors, adaptors, leads and check devices are approved?
• Does it support the required asset volume and recording method?
• How are firmware, servicing, functional checks and calibration handled?
• Are clear instructions, suitable training and UK technical support available?
• Can the supplier explain the limitations of automatic test sequences?

A simple manual instrument may suit a low-volume, well-defined programme. A downloadable tester with barcode support may reduce transcription errors across thousands of assets. Wireless transfer and cloud-compatible reporting are administrative benefits; they do not identify every defect or decide which assessment is safe.

Frequently asked questions

Must businesses carry out PAT testing?

No universal law requires a process bearing that name. In Great Britain, regulation 4(2) of the Electricity at Work Regulations 1989 requires systems to be maintained, so far as reasonably practicable, to prevent danger. Risk-based inspection and electrical testing may form part of meeting that duty.

Does non-portable equipment need PAT testing?

It requires maintenance appropriate to its risk, but not necessarily conventional PAT testing. Its construction, use and connection method determine the suitable inspection, testing and maintenance approach.

Does a built-in oven need a PAT test?

Not automatically. A built-in or hard-wired oven needs an appropriate maintenance assessment. Work involving its fixed connection or the installation should be undertaken by an electrical professional competent for that task.

Who can carry out inspection and testing?

Someone competent for the particular task. Basic user checks require less knowledge than combined inspection and testing, fault diagnosis, repairs or work on fixed equipment.

Does new equipment need PAT testing?

HSE’s default position is that new equipment should arrive in a safe condition and should not ordinarily require formal portable appliance testing before first use. A simple visual check should identify obvious damage. If damage or a defect is suspected or identified, or equipment-specific instructions require further action, withdraw the item where appropriate and arrange assessment by a competent person rather than applying routine testing indiscriminately.

How much does PAT testing cost?

There is no reliable universal per-item price. A quotation may include a call-out charge, travel, a minimum quantity, asset labels, reports, retests and VAT. Compare offers on the same basis by specifying the number and types of items, locations, access requirements and reporting format. Confirm whether the charge is per item, per person, per site or for the entire visit, and whether VAT is included.

Key takeaway

For most clearly defined programmes, the core kit consists of good visual-inspection tools, a suitable PAT instrument, compatible leads and adaptors, and a dependable recording method. Leakage-current capability, extension-lead adaptors, isolation equipment, printers and barcode systems are test-dependent or operational choices—not universal essentials.

Most importantly, equipment selection must follow competence, risk and correct identification of the item. Use HSE’s current guidance, the current IET Code of Practice, and the appliance and instrument manufacturers’ instructions. Refer repairs, intrusive work and hard-wired equipment to a professional competent for that work.

How this guidance was prepared

Lead Academy’s editorial team prepared this educational article by checking the applicable Great Britain legislation and current public guidance from HSE, then identifying the IET publication to which HSE directs practitioners for detailed technical methods and acceptance criteria. It does not represent a site assessment or substitute for competent, equipment-specific advice.

What to Read Next:

• How to Become a Qualified Electrician in the UK
• Why Do You Want to Be an Electrician? Interview Q&A