On the one hand, the epidemic has had a major impact on China's economy and society. On the other hand, it will also drive profound changes in many fields.

For the circuit where the cable may catch fire and spread, leading to serious accidents, and the cable-dense places that are susceptible to external influences and fires, there should be appropriate fire resistance separation, and according to the importance of the cable line, the fire probability and its characteristics and economic and reasonable factors, determine the following fire prevention measures:

When multi-core cable is selected, its allowable carrying capacity can be calculated according to the numerical value of single-core cable of the same section. Copper core cables should be selected for the control and signal cables drawn from the DC cabinet. The voltage drop should not be greater than 5% of the nominal voltage of the DC system. The selection and laying of DC cables shall comply with the relevant provisions of GB 50217.

High-performance, long-life power cables (i.e., high-life wire and cable) adopt the cable process and technology used in nuclear power plants, double-layer insulation structure and irradiation cross-linking process (insulation and jacket are all irradiation cross-linked) to ensure the mechanical and physical properties, electrical properties and low-smoke halogen-free flame retardant properties of the cable, and extend the service life of the cable.

In many announcements of the State Grid notifying suppliers, we can often see such a notification from cable companies: the thickness of the insulation layer of the power cable produced is not qualified. So what is the impact of the thickness of the specific insulation layer on the cable? What kind of sheath is qualified? How can we make qualified cables in production? Let's take a look at it.

On December 26, 2015, "Bing Hua Hua Electric" pushed a short article on "Scientific and Reasonable use of 70-year life cable", which attracted the attention and consultation of some readers. Today, from personal understanding, the use principle of 70-year life wire and cable is explained: