The Difference Between Cable Testing and Appliance Testing (And Why You Need Both)

Understanding the basics: Cable testing vs appliance testing

Appliance testing is the process of inspecting the internal electrical safety of the device itself. This applies to common workplace equipment like computers, kettles, microwaves and power tools. The test checks for internal faults that could cause electric shock or fire, such as insulation breakdown and earthing issues.

It also confirms the appliance is operating within safe limits. Regular appliance testing helps guarantee equipment remains compliant with safety standards and minimises the risk of unexpected electrical failure.

Alternatively, cable testing focuses on the safety of the cords and connections that supply power to appliances. This includes power leads, extension cords, and portable RCDs (Residual Current Devices). While these items might appear fine to the eye, internal issues like exposed wires, poor connections, or insulation faults can pose serious electrical hazards.

Cable testing uses specialised equipment to detect faults that aren’t visible during a simple visual inspection. Regular testing helps prevent incidents caused by damaged cords and ensures that all components in the electrical chain meet safety requirements.

Why full safety requires both

Combined testing = Full safety assurance

To guarantee complete electrical safety, a qualified tester must test both the appliance and its power supply. While appliance testing checks the internal safety of the equipment, many faults actually occur in the power leads, plugs or connectors. Frayed cords, loose wiring or damaged insulation can easily go unnoticed without proper cable testing. By testing both components, you cover the full risk spectrum, ensuring not just that the device works safely, but that it’s safely connected to power too.

AS/NZS 3760:2022 compliance

The AS/NZS 3760:2022 standard outlines the procedures for testing and tagging electrical equipment in Australia and New Zealand. It requires both appliance and cable testing as part of a complete safety inspection. Skipping either part increases risk and can render the test non-compliant. To meet the standard and protect users, a tester must check both the device and its power connection.

Insurance and legal obligations

Failing to conduct proper testing, which includes missing cable checks or skipping appliance assessments, can have serious consequences. In the event of an electrical incident, incomplete or incorrect testing may void your insurance coverage and expose your business to legal action. 

It’s essential to adhere to the full testing requirements as it protects people and maintains compliance with workplace safety laws and insurance conditions.

What can go wrong if you fail to test appliances and cables?

Plugs, extension leads and power boards are some of the most common points of electrical failure in the workplace. While it's easy to focus on the appliance itself, a worn-out cord or faulty plug can be just as dangerous.

Skipping appliance or cable testing leaves gaps in your safety checks, increasing the risk of electric shock, equipment failure, or even fire. Comprehensive testing is the only way to ensure all parts of the electrical setup are safe and compliant at all times.

How professional test and tag services ensure you cover both

Professional test and tag services follow a logical process that ensures the tester misses nothing. Trained technicians carry out a full visual inspection and use specialised testing equipment to check both appliances and their cords or leads. These professional-grade testers can detect internal faults that are not visible to the naked eye.

Once testing is complete, the tester applies a tag and record to each item, accompanied by detailed reports. This not only maintains compliance with AS/NZS 3760:2022, but also gives you peace of mind that your workplace is safe and you are meeting your legal obligations.