Selecting test equipment for household appliance safety testing is not simply a matter of purchasing instruments listed in a standard. Engineers must understand the relationship between product characteristics, applicable safety requirements, test procedures and the equipment needed to perform each evaluation.
The IEC 60335 series covers a broad range of household and similar electrical appliances, from cooking equipment and kitchen machines to washing machines, refrigerators and personal care appliances.
Although these products share many general safety requirements, their particular construction, operating principles and potential hazards can lead to significantly different testing arrangements.
For testing laboratories, manufacturers and product compliance engineers, the real challenge is translating standard requirements into a practical and reliable testing configuration.
This guide explains how to approach IEC 60335-2 equipment selection, identify the required test functions and plan laboratory capabilities more effectively.
1. Understanding the Structure of IEC 60335
Before selecting equipment, it is important to understand how the IEC 60335 series is organized.
The series consists of two complementary types of standards.
IEC 60335-1: General Requirements
IEC 60335-1 establishes general safety requirements for household and similar electrical appliances.
Its scope covers common electrical, thermal, mechanical and other reasonably foreseeable hazards.
Typical evaluation areas include:
- Protection against access to live parts
- Input power and current
- Heating and operating temperature
- Leakage current and electric strength
- Moisture resistance
- Abnormal operation
- Mechanical strength
- Construction and insulation
- Resistance to heat and fire
These requirements establish a common safety framework for many appliance categories.
IEC 60335-2: Particular Requirements
IEC 60335-2 contains additional or modified requirements for specific types of appliances.
Examples include:
| Standard | Appliance Category |
|---|---|
| IEC 60335-2-5 | Dishwashers |
| IEC 60335-2-6 | Stationary cooking ranges, hobs and ovens |
| IEC 60335-2-9 | Grills, toasters and similar portable cooking appliances |
| IEC 60335-2-14 | Kitchen machines |
| IEC 60335-2-15 | Appliances for heating liquids |
| IEC 60335-2-24 | Refrigerating appliances and ice-makers |
| IEC 60335-2-25 | Microwave ovens |
| IEC 60335-2-80 | Fans |
An important distinction is that Part 2 is generally applied together with Part 1. The applicable Part 2 standard may add requirements, modify general requirements or replace particular provisions.
Therefore, equipment selection should always consider both the general requirements and the relevant appliance-specific requirements.
2. Identify the Applicable Test Requirements Before Selecting Equipment
One of the most important steps in laboratory planning is identifying exactly which requirements apply to the product being evaluated.
The same test category can involve different procedures depending on the appliance.
For example, a heating test for a stationary cooking appliance may require particular test vessels, temperature measurement arrangements and specified operating conditions.
A similar evaluation for a kitchen machine may involve different operating loads, materials and specimen configurations.
A practical starting point is to establish a test requirement matrix.
| Evaluation Area | Key Questions | Equipment Considerations |
|---|---|---|
| Electrical safety | How are accessible live parts and insulation evaluated? | Test probes, leakage current testers and dielectric strength testers |
| Heating | Where and under what conditions must temperature be measured? | Temperature sensors, thermocouples and data acquisition systems |
| Moisture resistance | What type of liquid exposure or spillage is specified? | Splash test apparatus, funnels and specified test solutions |
| Abnormal operation | What abnormal conditions must be simulated? | Programmable power supplies, monitoring instruments and dedicated fixtures |
| Mechanical strength | What forces, impacts or mechanical conditions are applied? | Impact testers, force measurement systems and mechanical fixtures |
| Construction | What dimensions, clearances or protective features must be verified? | Measuring gauges, test probes and dedicated accessories |
| Heat and fire resistance | What material-related thermal or fire tests are applicable? | Glow-wire apparatus, ball pressure testers and other specified test systems |
Not every category applies to every appliance. The actual requirements must be determined from the applicable standard, edition, clause and test conditions.
3. Translate Standard Clauses into Equipment Requirements
Understanding a standard is only the first part of the process. Engineers must also determine what is physically required to perform each test.
A useful method is to separate testing resources into three groups.
A. Measuring Instruments
These instruments measure electrical, thermal, mechanical or other physical parameters.
Examples include:
- Digital multimeters
- Power analyzers
- Leakage current testers
- High-voltage dielectric testers
- Temperature measurement systems
- Force gauges
- Resistance measurement instruments
The required measurement range, accuracy, response characteristics and operating conditions should be checked against the test procedure.
B. Standardized Accessories and Test Materials
Many IEC 60335 tests require specific accessories that are not conventional measuring instruments.
Examples include:
- IEC 61032 test probes
- Standardized test vessels and pans
- Specified test loads
- Test rods and mechanical gauges
- Fabrics and other test materials
- Defined liquid solutions and consumables
These items can be just as important as the measuring instruments because their dimensions, materials and physical characteristics may directly affect the test result.
C. Dedicated Test Apparatus
Some requirements cannot be conveniently performed using general-purpose instruments alone.
They may require dedicated mechanical structures, controlled operating conditions or integrated testing arrangements.
Examples include:
- Appliance-specific heating test arrangements
- Door endurance test systems
- Water splash and spillage test apparatus
- Mechanical strength test fixtures
- Specialized abnormal-operation test systems
The choice between a general-purpose instrument and a dedicated test system should be based on the actual test method.
4. Equipment Requirements Across Different Appliance Categories
The following examples illustrate why equipment configurations should be developed around individual appliance categories rather than treating IEC 60335 as one uniform testing program.
4.1 Stationary Cooking Appliances — IEC 60335-2-6
This standard covers stationary cooking ranges, hobs, ovens and similar appliances.
Depending on the applicable requirements, testing arrangements may involve:
- Standard test vessels and pans
- Temperature measurement probes
- Liquid spillage test accessories
- Mechanical test fixtures
- Electrical safety measuring instruments
- Specialized accessories for particular cooking technologies
For example, induction hobs and conventional heating appliances may require different test arrangements because their operating principles and heating characteristics are different.
Engineers should therefore consider both the appliance construction and the specific test conditions when preparing the equipment list.
4.2 Portable Cooking Appliances — IEC 60335-2-9
This standard addresses portable appliances with cooking functions, including grills, toasters and similar products.
Potential equipment requirements include:
- Specified heating loads
- Test vessels
- Temperature probes
- Moisture resistance accessories
- Mechanical test materials
- Electrical safety instruments
The test setup may vary considerably between a toaster, a portable oven and an electric grill.
A single general-purpose fixture is unlikely to cover every application without considering the particular test requirements.
4.3 Kitchen Machines — IEC 60335-2-14
Kitchen machines include blenders, food processors, mixers, juicers and other electrically operated food preparation appliances.
Their testing may involve:
- Specified operating loads and materials
- Mechanical and construction-related test accessories
- Temperature measurement instruments
- Electrical safety test equipment
- Application-specific fixtures
For these appliances, the operating load and specimen configuration can be particularly important.
A test arrangement should reproduce the conditions specified by the relevant procedure rather than relying on an arbitrary operating condition.
4.4 Appliances for Heating Liquids — IEC 60335-2-15
This category includes appliances such as coffee-makers, kettles and other equipment designed to heat liquids.
Depending on the appliance and applicable clauses, testing may require:
- Defined water conditions
- Standardized containers or test vessels
- Temperature measurement systems
- Electrical safety instruments
- Moisture-related accessories
- Specific operating and abnormal-condition arrangements
The physical properties and conditions of the test liquid may influence the test procedure and must be controlled where specified.
4.5 Refrigerating Appliances — IEC 60335-2-24
Refrigerators, freezers and ice-makers introduce additional testing considerations.
Equipment requirements may include:
- Temperature monitoring systems
- Specified test materials and loads
- Water spillage test arrangements
- Mechanical and stability test accessories
- Electrical safety instruments
- Specialized equipment for particular refrigerating technologies
The testing configuration should reflect the appliance's refrigeration system, operating conditions and applicable safety requirements.
These examples are intended to illustrate equipment selection principles. They are not exhaustive lists or substitutes for the actual requirements of the relevant IEC publications.
5. General-Purpose Equipment vs. Dedicated Test Systems
When establishing a laboratory, one important decision is determining which equipment should be shared across different testing programs and which requires a dedicated configuration.
Both approaches have advantages.
| Consideration | General-Purpose Equipment | Dedicated Test Systems |
|---|---|---|
| Application | Multiple testing tasks | Specific test procedures |
| Configuration | Adjustable or reusable | Designed around defined requirements |
| Flexibility | Generally higher | Depends on system design |
| Integration | May require additional fixtures | Can integrate multiple test functions |
| Investment planning | Suitable for shared laboratory resources | Suitable for specialized capabilities |
For example, a temperature measurement system may support several appliance testing programs, provided its channels, sensors and measurement performance are suitable.
However, a specialized endurance test may require a dedicated mechanical structure, controlled movement and integrated data recording.
A practical laboratory should balance shared instruments with application-specific testing equipment.
The goal is not to purchase a separate instrument for every clause, but to establish a configuration that can reliably perform all required test procedures.
6. How to Build an IEC 60335 Laboratory Equipment List
A structured approach can help laboratories avoid unnecessary purchases and reduce gaps in their testing capabilities.
The following workflow is useful when planning a new laboratory or reviewing an existing equipment inventory.
Step 1: Define the Appliance Categories
Identify the products the laboratory intends to evaluate.
For example:
- Cooking appliances
- Kitchen machines
- Refrigerating appliances
- Washing machines
- Heating appliances
- Personal care appliances
Step 2: Confirm the Applicable Standards and Editions
Identify the relevant IEC 60335-1 and Part 2 publications.
Check the publication status, amendments and applicable edition for the intended certification or target market.
Do not assume that an equipment list developed for an earlier edition remains fully applicable to a newer edition.
Step 3: Review Individual Clauses and Test Conditions
For every applicable requirement, identify:
- Test objective
- Test procedure
- Operating conditions
- Measurement parameters
- Required accessories
- Specimen preparation
- Required test materials
Step 4: Map Requirements to Equipment
Create a clause-to-equipment matrix.
For example:
| Test Requirement | Equipment or Accessory | Existing Equipment Available? |
|---|---|---|
| Electrical accessibility | IEC 61032 test probes | To be evaluated |
| Temperature measurement | Temperature sensors and data acquisition | To be evaluated |
| Dielectric strength | High-voltage tester | To be evaluated |
| Mechanical impact | Spring impact hammer or specified impact apparatus | To be evaluated |
| Moisture resistance | Applicable splash or spillage apparatus | To be evaluated |
| Heat resistance | Applicable glow-wire or ball pressure apparatus | To be evaluated |
This matrix helps distinguish equipment that is already available from equipment that must be purchased, customized or supplemented.
Step 5: Evaluate Equipment Performance
Before confirming a purchase, check:
- Measurement range
- Accuracy and resolution
- Operating frequency, where applicable
- Mechanical dimensions
- Control and adjustment capabilities
- Compatibility with the specified test procedure
- Calibration and verification requirements
An instrument that has the correct general name may still be unsuitable if its technical characteristics do not satisfy the test conditions.
Step 6: Plan Integration and Documentation
For more complex testing programs, consider whether separate instruments should be integrated into a common test platform.
Data acquisition, operating control, test records and report generation can improve laboratory efficiency.
However, integration should not change the essential test conditions or compromise the measurement requirements.
7. Common Mistakes in IEC 60335-2 Equipment Selection
Several problems frequently occur during laboratory equipment planning.
Mistake 1: Selecting Equipment Based Only on Standard Numbers
A standard number does not automatically identify every required instrument and accessory.
Individual clauses, figures and test procedures must be reviewed.
Mistake 2: Treating Part 1 as the Complete Testing Requirement
Part 1 establishes general requirements, but Part 2 may introduce additional or modified testing conditions.
Ignoring appliance-specific requirements can result in incomplete equipment configurations.
Mistake 3: Overlooking Accessories and Test Materials
Test vessels, fabrics, specified liquids and mechanical accessories are sometimes excluded from preliminary equipment budgets.
Yet these items can be essential to performing the prescribed tests.
Mistake 4: Using Outdated Equipment Lists
Standards are revised periodically. Changes may affect test procedures, accessories, measurement conditions or equipment configurations.
Existing laboratory inventories should therefore be reviewed against the applicable editions.
Mistake 5: Confusing Instrument Specifications with Test Compliance
A tester's measurement range or accuracy alone does not establish that the complete test setup meets a standard.
The instrument, fixture, specimen, operating conditions and test procedure must be considered together.
8. Developing a More Efficient Testing Laboratory
An effective appliance safety laboratory should be planned as a coordinated testing capability rather than a collection of independent instruments.
A practical laboratory configuration can be divided into three levels.
Level 1: Core Testing Capabilities
These include commonly used electrical, temperature and mechanical measurement instruments.
Level 2: Appliance-Specific Accessories
These include standardized test probes, vessels, loads, materials and dedicated fixtures for particular product categories.
Level 3: Specialized Testing Systems
These include integrated or customized systems for complex testing procedures that cannot be adequately performed using general-purpose instruments alone.
This approach allows laboratories to share suitable equipment between different programs while maintaining dedicated configurations where necessary.
It also makes future laboratory expansion easier because new capabilities can be added according to actual testing demand.
For engineers preparing equipment inventories or planning laboratory upgrades, a useful starting point is to review an IEC 60335-2 test equipment guide covering appliance-specific standards and clause-level equipment requirements.
The reference organizes different appliance categories, related testing requirements and corresponding equipment, helping engineers identify potential equipment needs before developing a detailed laboratory configuration.
The final selection should always be verified against the official IEC publication and the specific test conditions.
Conclusion
Selecting test equipment for IEC 60335-2 requires more than matching a standard number with an instrument.
Engineers need to understand the relationship between general safety requirements, appliance-specific provisions, test procedures and the technical capabilities of the equipment.
A structured clause-to-equipment approach helps laboratories identify shared resources, determine where dedicated fixtures are necessary and avoid gaps in their testing capabilities.
Ultimately, a well-designed laboratory is not defined by the number of instruments it contains, but by its ability to perform the required evaluations reliably, consistently and in accordance with the applicable standards.
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