A few days ago, the State Administration of Market Supervision issued the general office of the State Administration of market supervision Wire and cable And explosion-proof electrical products quality and safety special rectification notice (hereinafter referred to as the "notice"). The State Administration of market supervision decided to From October to mid November 2020, it will be carried out once in the whole country Wire and cable The quality and safety of explosion-proof electrical products is centralized and special rectification.
In recent years, according to the quality and safety supervision of the products, Wire and cable In terms of cross-linked polyethylene insulation, it will be flame-retardant and low-voltage power cable (including halogen-free and low smoke type) as the focus, focusing on the Wire and cable Industrial cluster area and sales and circulation concentrated area are the key areas.
In this special rectification, Wire and cable (XLPE insulation flame retardant low voltage power cable ）The problems of flame retardant, halogen-free and low smoke performance not meeting the standard requirements and not implementing cross-linking process are the key points 5 years of national or local supervision and inspection results unqualified, as well as the existence of quality violations or complaints by consumers, media exposure wire and cable enterprises as the focus of the spot check.
In terms of special rectification measures for wires and cables:
1. Check whether the flame retardant, halogen-free and low smoke performance meets the standard requirements. For the flame retardant sheath material can not meet 90 degree heat resistance grade, XLPE insulation, no armor and flame retardant power cable If the flame retardant performance is unqualified and halogen-containing or low halogen materials are used instead of halogen-free and low smoke materials, the focus should be on whether the insulation is extruded according to the "rated voltage of 1KV (UM = 1.2KV) to 35kV (UM = 40.5kV) power cable And accessories Part 1: cables with rated voltage of 1KV (UM = 1.2KV) and 3KV (UM = 3.6kV) (GB / T 12706.1-2020), whether the raw material purchase inspection record is made. To focus on cross-linked polyethylene insulation without armor flame retardant power cable Whether there is isolation layer, whether the covered isolation layer is glass fiber belt (should not be combustible).
2. Check whether the crosslinking process is implemented according to the process requirements 。 In view of the problems such as low crosslinking degree of XLPE insulation material and reduction of product heat resistance grade due to non-compliance with process requirements, for the warm water (steam) crosslinking process, mainly check the quantity of cable reels and corresponding crosslinking time requirements (see the operation instructions of crosslinking process) in the warm water (steam) crosslinking process, and whether the capacity and actual output of crosslinking process are backward Match. For the UV cross-linking process, the cross-linked products (insulation inner layer) can be extracted on site, and the inspection personnel of the production enterprise can be observed to determine whether the thermal extension test is qualified, and the largest production specification products can be selected for inspection as far as possible. For irradiation crosslinking process, check whether the irradiation crosslinking equipment (electron accelerator) is provided. If the enterprise entrusts the process, check whether the processing contract is consistent with the entrusted processing quantity, and trace back to the entrusted unit if necessary.
3. Carry out on-site product sampling inspection. The spot check products are guided by finding problems, considering the sample size and process structure : (1) zc-yjv-0.6/1 (3-5) core (16-50), (2) wdzc-yjy-0.6/1 (3-5) core (16-50) products. The main detection indexes include: DC resistance of conductor, thermal extension of insulation, thermal shrinkage of insulation, bunching combustion test, pH value, conductivity and transmittance (halogen-free and low smoke products).
4. Basic requirements for enterprise rectification. Establish a sound qualified supplier evaluation system and raw material procurement quality control system; match the warm water (steam) crosslinking equipment and facilities with the production scale; strengthen the product delivery inspection, and conduct insulation thermal extension test for each batch of products.
The State Administration of the people's Republic of China should focus on market supervision at the provincial level Wire and cable For key products, the supervision and inspection shall be carried out on the site of the production enterprises, highlighting the links and aspects that may cause disqualification, and conducting random inspection of products when necessary; the enterprise shall be ordered to rectify the problems found and write off accounts one by one.