The editor teaches you how to choose the type of wire and cable

　　(1) First of all, copper or aluminum core wires and cables shall be selected according to the location and load characteristics. Due to the high conductivity of copper, low loss of copper, good mechanical property ductility, easy processing and installation, and high fatigue resistance, the specifications require: flammable and explosive places, important public buildings and residential buildings, especially places with aluminum corrosion and humidity and places where people gather, important reference rooms, machine rooms and important warehouses, Copper conductor shall be used for mobile equipment or places with severe vibration and other places with special provisions; Because of its small proportion and light weight, aluminum core wires and cables are mostly used for overhead transmission lines and medium frequency lines with large cross-section. Moreover, aluminum core wires and cables are also widely used in many places because of its low cost.

　　(2) Select the insulation type of the conductor according to the laying method and environmental conditions. PVC wires and cables have low cost, acid and alkali resistance, and are suitable for general projects. However, when the PVC wires and cables are burned in the fire, they will produce highly toxic smoke, causing people to be poisoned and suffocated. The sediment in the smoke is conductive and corrosive. Therefore, cross-linked polyethylene, halogen-free ethylene propylene rubber and cables can be used in places with low toxicity and fire resistance requirements; For fire power supply and control lines, the automatic fire alarm system shall correspond to the mineral insulated cables or organic insulated fire-resistant wires and cables according to the level of the protection object, and the branch shall be the trunk or trunk with the lower level of wires and cables. For buildings with high requirements such as class I high-rise buildings and important public places, flame retardant low smoke halogen-free crosslinked polyethylene insulated power cables and wires or smokeless halogen-free power cables and wires shall be used.

　　(3) Correctly select the rated output voltage through wires and cables. The insulated conductor shall meet the requirements of voltage provided by social work. The indoor plastic insulated wire shall not be less than 0.45/0.75kv, and the power system cable enterprise shall not be less than 0.6/1kv The rated current and voltage of control network cable shall not be lower than the voltage in the working process of the circuit, and generally 0.45/0.75kv should be selected When the influence of external environmental electrical information interference factors is small, a lower rated input voltage can be selected.