Microwave ovens are common appliances in workplace staffrooms, warehouses, and commercial kitchens across NSW. Because they are used frequently, they should be periodically inspected and tested to confirm they remain safe to operate.
In Australia and New Zealand, microwave testing forms part of broader electrical safety practices under AS/NZS 3760, while specific safety requirements for microwave ovens are defined under AS/NZS 60335.2.25.
This standard governs the inspection and testing of electrical equipment used in workplaces. For microwave ovens this includes:
This standard specifies the maximum allowable microwave leakage level.
Leakage must not exceed 5 mW/cm² (50 W/m²) measured approximately 50 mm from the external surface of the appliance.
Microwave testing requires a specialised microwave leakage detector in addition to standard electrical safety testing equipment.
Microwave leakage testing measures the amount of microwave radiation escaping from the appliance while it is operating. A specialised microwave leakage detector measures energy density in either mW/cm² or W/m².
Under AS/NZS 60335.2.25, the maximum allowable leakage level for microwave ovens is:
5 mW/cm² (50 W/m²) measured approximately 50 mm from the external surface of the appliance.
During testing, technicians scan the perimeter of the microwave door, viewing window, and ventilation openings while the microwave operates with a water load inside the cavity. The leakage detector identifies any points where radiation levels approach or exceed the permitted limit.
If measured leakage exceeds this limit the appliance must be removed from service and either repaired or replaced.
A small water load is placed inside the microwave while it operates. A leakage detector is passed around the door seal, window, and ventilation openings to measure radiation levels.
Testing intervals under AS/NZS 3760 are determined by the environment in which equipment is used rather than the appliance itself.
| Environment | Example Location | Testing Interval |
|---|---|---|
| Harsh / High-Use | Commercial kitchens, workshops | 6 months |
| Open Access | Office staffrooms | 12 months |
| Low Risk | Boardrooms | Up to 2 years |
If excessive radiation leakage or electrical faults are detected the appliance must be removed from service immediately and either repaired or replaced.
Routine inspection and testing helps businesses demonstrate due diligence under workplace safety obligations and supports compliance during audits, insurance reviews, and SafeWork inspections.