The product has been certified by CCC and is still judged to be unqualified in the market supervision and random inspection. Why?

Date：2021/9/7　　Clicks：1060

Case 1

The grounding wire structure of a CCC certified product of an electric heater is shown in Figures 1, 2 and 3.


   Figure 1 The structure of a heater                    Figure 2 A partial enlarged view of the grounding structure

(All pictures are from real shots)

After the product went on the market, a certain supervisory random inspection judged that the grounding terminal did not have a grounding symbol, and it did not meet the standard 7.8 of GB 4706.1-2005 "Safety of Household and Similar Electrical Appliances Part 1: General Requirements". The grounding wire structure is shown in Figure 4.

Note: The stamped ground symbol is still on the bottom plate.

Figure 4 Unqualified ground wire structure

Why are CCC-certified products still being judged unqualified in the market supervision and random inspection?


For a certain electric oven, the N symbol indicating the middle line of the power cord is marked after the second terminal, as shown in Figure 5. Does it meet the requirements of clause 7.8 of the GB 4706.1-2005 standard?

Figure 5 N symbol of an electric oven

Case 1: Electric heater

The grounding wire structure of the certified product type test sample is: the grounding wire of the power cord is directly screwed on the bottom plate with a grounding symbol.

The structure of the grounding wire of the unqualified product is: the power cord is replaced with a high temperature resistant internal wiring through the closed terminal, and then screwed on the bottom plate. The vicinity of the "first" grounding terminal connected to the power supply, that is, the closed terminal, without a grounding symbol, was judged not to comply with clause 7.8 of the GB 4706.1-2005 standard.

As a researcher, the basic concept must be clear. The high-temperature grounding wire in the red box in Figure 4 is the "internal wiring", not the "grounding wire in the power cord". Whether the internal grounding conductor of the product should be marked with a grounding symbol is not required by the GB 4706.1-2005 standard. The "first" grounding terminal where the external power cord enters the product for connection should be marked with a grounding symbol.

This case also revealed that the company had loopholes in the “certified product changes” project, and the changes related to product safety regulations had not been fully evaluated, and they had to be reported to the certification body if necessary.

Case 2: Electric oven

The situation is similar to case 1, because there is no N mark near the "terminals connected to the grid", but there is an N mark near the internal wiring terminals, which does not meet the requirements of clause 7.8 of the GB 4706.1-2005 standard.


GB 4706.1-2005 "Safety of Household and Similar Electrical Appliances Part 1: General Requirements" (IEC 60335-1:2004, IDT) standard

7.8 Except for Z-connections, the wiring terminals used to connect to the power grid shall be marked as follows:

——Connecting terminals specially connected to the neutral line should be marked with the letter N.

——The protective ground terminal shall be marked with the symbol 5019 specified in GB/T 5465.2 (idt IEC 60417).

These symbols should not be placed on screws, removable washers or other parts that can be removed when connecting wires.

Determine whether it is qualified by inspection.