Household wire and cable selection and safety

Household wire and cable should be in accordance with the rated voltage of the low-voltage power distribution system, electrical load, laying environment, and whether it is with the nearby electrical installations, facilities to produce harmful electromagnetic induction between the requirements to select the appropriate type and cross-section, in order to achieve the effect of economic, practical and safe. The first consideration is the safety of laying electricity, for household wires and cables is the use of copper conductors or the use of aluminum conductors is also very important, it is recommended that residential laying of lines must be used when the copper core wire, because copper-core wire than aluminum core line has better strength and ductility, conductivity is also better than the aluminum core line, the same cross-section of the service life of the copper-core wire than the aluminum-core wire, long, and the melting point of the aluminum is lower than the copper, once the line is overloaded, it is very Once the line is overloaded, it is easy to fire. Commonly used in general household copper wire, model: BV, BVR, BVV, BVVB, RVV, etc., all of which are soft polyvinyl chloride insulation, moisture-proof, oil-resistant, acid-resistant, corrosion-resistant and so on, the use of a fairly wide range of characteristics. For the selection of cable cross-section size, should be based on the greater demand for residential electricity and wire and cable can withstand a greater flow rate. In the past, people calculate residential electricity consumption, is based on the building design specification said that according to each square meter area of 40 ~ 50W calculation. This is fine for large houses of more than 90 square meters, but it cannot meet the requirements for ordinary houses of 50~60 square meters. Therefore, before residential renovation, you should plan the entire power consumption of the residence, and then choose the cross-section of the wire. If all the general household appliances are calculated, including air conditioners, refrigerators, washing machines, color TV, microwave ovens, water heaters, rice cookers, computers, stereos, etc., and then leave a few years of development of the margin, then the electrical load of each residence should be 6 ~ 8KW.

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