Spring Festival, purchase, dinner is our traditional program. When we go to the supermarket with the family shopping, see Ling Lang everywhere all kinds of New Year, can think of such a happy and peaceful environment needs how security.
　　January 17, Nanjing Jiangning District, a supermarket warehouse fire, when a large number of people are purchasing new products, but fortunately evacuation in time, no casualties. Insiders say the fire may be caused by an electrical fault.
　　Supermarkets are often one of the most crowded public places, especially holidays or evening leisure time, it is the peak of the flow of the supermarket. However, due to the construction span, wide space, combustible, air circulation is good, the supermarket in the event of fire, often rapid development of the fire, and staff-intensive, evacuation and escape challenge.
　　So how to do security precautions? First of all, should understand the main cause of the fire. According to data released by the Fire Department of the Ministry of Public Security, from January to October in 2016, the country received a total of 250,000 fire incidents, of which, due to electrical accidents caused by a total of 7.6 million, accounting for 30.3% of the total, electrical accidents become a " The culprit ". The supermarket as a result of more power equipment, such as electricity for home appliances, food processing electricity, all kinds of maintenance, daily necessities, electricity, electricity, fire "high incidence area."
　　Electrical fires generally refer to fires caused by ignition of the body or other combustibles in the presence of combustion conditions due to the thermal energy released by electrical circuits, electrical equipment, appliances and power supply equipment, including fire leakage, short circuit fires, Excessive fires and contact resistance is too large to fire. Electrical accidents are often associated with the use of wire and cable materials inextricably linked. Wire and cable is mainly responsible for the transmission of electrical energy, mechanical, electrical, electrical and all types of electricity and related equipment, construction, equipment and other essential equipment, can be described as the most basic but the most important material. Only choose fire, high temperature and good electrical performance of the cable, the formation of a solid disaster prevention, disaster barrier, in order to effectively reduce the occurrence of electrical fires.
　　Therefore, for the crowded, flammable and explosive places, residential building electrical design specifications JGJ 242-2011 clearly stipulates that should be used copper cable or wire.
　　Indeed, in the disaster prevention, disaster relief, copper cable has many technical advantages, is the supermarket, shopping malls and other staff-intensive places the ideal cable material.
　　Copper has good electrical conductivity. Under the same wire diameter conditions, copper can conduct more current than other metal materials. Copper has a high melting point and can withstand large overload current or short circuit currents while ensuring safety.
　　Copper also has good thermal conductivity and heat dissipation. Even if the current flow causes temperature rise, the copper wire can still maintain a lower temperature and reduce the resistance. This is critical to the reliability and safety of wire connections.
　　In addition, copper has a good creep resistance, easy to creep and loose during the connection, to avoid the wire connecting terminal loose and produce an electric arc and lead to electrical fires. At the same time, the high mechanical strength of copper, copper excellent tensile capacity, can effectively avoid the reduction of the cross-sectional area caused by reduced current carrying capacity, overload or overheating.
　　With excellent electrical performance and simple installation and maintenance requirements, copper cables have been universally recognized and recognized by the electrical industry. Copper cables are already the best proven cable materials, designers, contractors, and customers who have chosen copper cables in particular when considering cable materials, especially considering the reliability and safety of the building after use.