Introduction to the implementation rules of the national spot check of plug and socket products and the unqualified situation of the spot check over the years

Date：2021/4/9　　Clicks：1082

Recently, the State Administration for Market Regulation released the 2021 National Supervision and Inspection Plan for Product Quality. The plan clarifies that the requirements of the "14th Five-Year Plan" for national economic and social development must be implemented, centered on the comprehensive implementation of the strategy of strengthening the country by quality, and adhere to the people's livelihood orientation and problem orientation. Adhere to the integrated supervision of production and distribution, online and offline, give more prominence to consumer products and special population products, and focus more on safety indicators and key performance indicators. In 2021, the national spot check on the quality of domestic products officially opens. Subsequently, the State Administration of Market Supervision publicly solicited opinions on the implementation rules for the national supervision and random inspection of 62 product quality (for comments on the implementation rules for the national supervision and random inspection of 62 product quality).

In the 2021 spot check plan, household and similar use plugs and sockets (hereinafter referred to as "plugs and sockets") products are included. In recent years, plug and socket products (including multi-function sockets with power adapters) have been listed in the country almost every year. The supervision and spot check plan highlights the importance of the quality and safety of plug and socket products!

In order to let the majority of enterprises better understand the content of national supervision and random inspections and do a good job in improving product quality, this article will briefly introduce the implementation rules for national supervision and inspection announced this year, and give a brief account of the process of national supervision and random inspections in recent years. The unqualified items found in the plug and socket products are summarized and analyzed!

First, briefly introduce the content of this year's implementation rules for the national supervision and random inspection of the quality of household and similar plugs and sockets (draft for comments):

1. Sampling method
Take random samples from the products to be sold by the sampled producers and sellers.
Random numbers can generally be generated using random number tables and other methods.
24 samples are taken from each batch of products, of which 12 are used as inspection samples and 12 are used as spare samples.

2. According to the standard
GB/T 2099.1-2008 Household and similar plugs and sockets Part 1: General requirements
GB/T 2099.3-2015 Household and similar plugs and sockets Part 2-5: Particular requirements for converters
GB/T 2099.7-2015 Household and similar plugs and sockets Part 2-7: Particular requirements for extension cords and sockets
GB/T 1002-2008 Single-phase plugs and sockets for household and similar purposes. Types, basic parameters and dimensions. Currently valid corporate standards, group standards, local standards and product quality requirements
*According to the preliminary judgment based on the standard, the sampling products include plugs, wall sockets, converters and extension cord sockets

3. Inspection items
Dimensional inspection, electric shock protection, grounding measures, fixed socket structure, plug and mobile socket structure, moisture resistance, insulation resistance and electrical strength, temperature rise, force required to pull out the plug, bending test, heat resistance, climbing The electrical distance, the electrical gap and the distance through the sealant, the resistance of the insulating material to abnormal heat, flame resistance and tracking resistance.

*For products that implement corporate standards, group standards, and local standards, the inspection items shall refer to the above content.

In addition, according to the National Supervision and Random Inspection Report issued last year, the enterprises and the inspection institutions to be inspected are determined by the "double random" method, that is, the sampling inspection institutions are selected through bidding, and the random inspection enterprises are randomly selected through the "double random" information system, and random matching Inspection agency. In addition, separate sampling inspections are implemented. In addition to on-site inspections, product sampling and inspection are carried out by different institutions or different personnel within the institutions.

Next, let’s introduce the unqualified items and the proportions of plug and socket products in the sampling inspection process in the past three years:


Ordinary plug and socket products

Serial number

Unqualified items

The number of occurrences

Percentage

1

Heat resistance (ball pressure test)

11

35.5%

2

Dimensional inspection

7

22.6%

3

Protection against electric shock

5

16.1%

4

Flexible cable and its connection

4

12.9%

5

Flame resistance (glow wire test)

3

9.7%

6

Mobile plug socket structure

1

3.2%


 Extension cord socket (with power adapter) multifunctional product

Serial number

Unqualified items

The number of occurrences

Percentage

1

Structure of extension cord socket

5

27.8

2

Flexible cable and its connection

4

22.2%

3

Heat resistance (ball pressure test)

3

16.7%

4

Protection against electric shock

2

11.1%

5

Creepage distance, electric clearance

2

11.1%

6

Flame resistance (glow wire test)

1

5.6%

7

Dimensional inspection

1

5.6%

According to the analysis of the unqualified items and the actual unqualified situation, the reasons for the unqualified are product design problems and product consistency problems, such as the heat resistance of insulating materials (ball pressure test) and heat resistance (glow wire) If the project is unqualified, it can basically be determined that there is a problem with the consistency of the insulating material, and the insulating material used in actual production cannot meet the standard requirements.

Unqualified size measurement (usually the actual measured value of the plug or socket exceeds the standard specified value), the creepage distance and the unqualified electrical clearance (such as the unqualified measured value between the live parts of the small five-hole product and the grounding circuit) may be caused by When designing the product, the design value is too close to the specified value of the standard. In actual mass production, some products may deviate from the design value, which will lead to the situation that the standard requirements are not met.

The structure of the extension cord socket is unqualified, and the situation is relatively complicated. Common problems include Article 14.9. For non-rewirable non-molded products, the free amount of grounding wire is required to be greater than that of LN wire. The possible reason is that it is in mass production. , Failing to strictly follow the specified stripping length, resulting in unqualified actual products. It is recommended to design the stripping length so that the grounding wire has a significant margin to avoid critical situations. It is judged as unqualified during product testing. Qualified, Article 14.10.2, is also a similar situation.

Of course, the reasons for non-conformity need to be analyzed in detail according to the specific circumstances. We hope that the majority of enterprises can fully pay attention to product quality, do a good job in product design, incoming inspection, batch inspection and other links to ensure that product quality meets the standard requirements!