Introduction to the Inspection Standards for Electric Oven Products Inspection and Certification Services for Warehousing and Factory Audits

September 10, 2025

Electric ovens, as common kitchen appliances, their quality directly affects the safety and experience of users. For purchasers, brand owners, and quality inspection professionals, establishing a comprehensive supply chain quality management system is of great significance through strict factory audits and pre-shipment inspections (PSI). This article will systematically elaborate on the inspection and testing standards, quality control (QC) processes, and inspection methods for electric ovens.
I. Source Control: Key Points for Factory Audit of Electric Oven Manufacturers
Before mass production, conducting a comprehensive supplier audit of the manufacturer is the foundation for ensuring product compliance and safety.
Quality Management System Certification:
Has the factory established and implemented the ISO9001 quality management system?
Do we have complete procedures and records for incoming material inspection (IQC), production line inspection (IPQC), and final product inspection (FQC)?
Does it have a complete quality traceability system?
Security Certification and Compliance:
Verify whether the factory holds the required CCC certification, CE certification, UL certification, and other relevant qualifications.
Confirm that the product design complies with the safety standards stipulated in IEC/EN 60335-2-9 and other relevant regulations.
Check whether the key components have the corresponding certification certificates.
Production equipment and testing capabilities:
Evaluate whether the production line is equipped with safety isolation devices and protective measures
Check whether the factory laboratory is equipped with devices such as pressure resistance testers, grounding resistance testers, and power testers.
Confirm whether the detection equipment is regularly calibrated and within its validity period.
Supply Chain Management:
Verify the qualifications of the suppliers for key components such as the heating tubes, temperature controllers, and glass doors.
Confirm whether the raw materials comply with environmental protection requirements such as ROHS and REACH.
II. Finished Product Inspection: Sampling Inspection Standard Process for Electric Ovens
The inspection of electric ovens should follow the AQL sampling standard (usually LEVEL II) and conduct random sampling, covering multiple aspects such as packaging, appearance, functionality, safety and performance.
1. Packaging and Labeling Inspection
Packaging materials: Check if the outer box is sturdy, and whether it is damaged, damp or deformed.
Product Identification: Verify whether the contents of the outer box label and the product nameplate are accurate and clear.
Completeness of attachments: Compare with the instructions and specifications, and check whether all attachments are complete.
Labels and Certifications: Ensure that the CCC, CE, and other certification marks are correct and accurate.
2. Visual and Structural Inspection (Appearance and Structure Check)
Shell quality: Check if the casing is cracked, deformed, damaged or rusted.
Glass door: Check if the surface has any scratches or deformations, and whether the installation is secure.
Assembly quality: Check whether the seams are uniform and whether the fasteners are complete and not loose.
Nameplate and identification: Check whether the nameplate, trademark, and decorative parts are installed correctly.
Power cord: Check if the power cord is damaged and if the plug conforms to the standard.
3. Functional Testing - Core Inspection Item
Switches and Knobs: Test whether all switches and knobs function properly and whether the feel is comfortable.
Heating function: Tests whether the heating element is functioning properly and whether the temperature has reached the required level.
Timer function: Test the accuracy of the timer and the normality of the alarm function.
Indicator lights: Check whether all indicator lights are functioning properly.
Fan: Test whether the fan is working properly and check for any abnormal noises.
4. Safety Testing - Mandatory Inspection Items
Ground Resistance Test: Measure the resistance between the grounding terminal and accessible metal components. The value should be ≤ 0.1Ω
Pressure resistance test: Apply 1250V AC voltage between the energized components and the housing for 1 minute. No breakdown phenomenon occurred.
Leakage current test: Measure the leakage current to ground during normal operation, and it should comply with the standard requirements.
Stability test: To check the stability of the product during normal use.
Temperature rise test: Measure the temperature rise of the housing, handle and other parts during normal operation. The results should comply with the standard requirements.
5. Performance Testing
Power Test: At the rated voltage, measure the input power. It should be within the range of +5% to -10% of the rated power.
Temperature uniformity test: Measure the temperatures at different locations within the oven and evaluate the temperature uniformity.
Thermal efficiency test: Evaluating the energy utilization efficiency of the product
III. Common Defect Classification
Critical (Severe Defects): Breakdown during withstand voltage test,不合格 grounding resistance， Excessive leakage current， Damaged power cord， Presence of metallic foreign objects inside the machine.
Major Defects: Power deviation, heating element not working, timer malfunction, switch knob failure, glass door cracked.
Minor (minor defect): Slight scratches on the appearance, misaligned labels, slight damage to the packaging, and minor deviations in non-critical dimensions.
IV. Inspection Rules and Criteria
Sampling Plan: Based on the batch size, samples are randomly selected according to the AQL standard.
Defect determination:
If just one Critical defect is found, the entire batch can be judged as不合格 (unqualified).
The number of major defects exceeded the AQL acceptance limit, so it was determined to be unqualified.
The safety project adheres to the principle of "zero tolerance".
Report Output: The detailed inspection report should include the sample size, test data, defect description (with attached pictures), and safety compliance conclusion.
Conclusion
Electric ovens, as electrical appliances directly related to user safety, must undergo strict and meticulous quality inspections. Factory inspection audits are conducted to ensure that manufacturers have the ability for safe production. Then, final random inspections before shipment are carried out to verify the finished products, forming a complete quality assurance system. Purchasers and brand owners should pay special attention to electrical safety tests to ensure that the products comply with relevant safety standards, providing consumers with safe and reliable products.
Key terms: Electrical oven inspection, Electrical safety testing, IEC 60335-2-9, Voltage withstand test, Ground resistance test, Leakage current test, Factory inspection audit, Supply chain quality management, AQL sampling