【Daily Topic】【Electrical Edition 20160807】

(1) Indoor cable wiring, including the exposed installation of cables along walls and building components indoors, as well as the buried installation of cables in metal pipes. (2) Cables should preferably be installed exposed indoors, and they must not have jute or other easily flammable outer coatings. (3) Cables without protective covers shall be installed exposed indoors. When laid horizontally, the distance from them to the ground shall not be less than 2.5 m; when laid vertically, the distance from them to the ground shall not be less than 1.8 m. When the above requirements cannot be met, measures should be taken to prevent mechanical damage to the cables; this restriction does not apply when the cables are installed in dedicated areas such as distribution rooms, motor rooms, and equipment floors. (4) When cables of the same voltage are installed side by side, the clear distance between them should be no less than 35 mm, and it should also be no less than the outer diameter of the cables; this restriction does not apply when the cables are installed in trays, channels, or conduits. (5) Power cables and control cables of 1 kV and below should be laid separately from power cables above 1 kV. When installed side by side, the clear distance between them should not be less than 150 mm

(1) The voltage rating of the conductor used in the circuit should be one level higher than the operating voltage of the circuit； Its insulation layer shall meet the wiring installation method and environmental conditions of installation ； The safe current for the cross-section should be determined based on the electrical load current and the requirements for mechanical strength. 　(2) The pipeline should be kept away from heat sources and heat-generating objects (such as chimneys, steam pipes, etc.). If passage is necessary, the temperature around the wire must not exceed 35°C, and insulation measures must be taken. 　(3) All exposed wiring should be laid horizontally and vertically ； The horizontal height of the conductor above the ground should be no less than 2.5 m, and for vertical lines it should be no less than 1.8 m. If these requirements are not met, protection measures must be implemented to prevent mechanical damage. 　(4) Wires cross each other during open wiring. All must be fitted with insulating sleeves or isolated. 　(5) At connections and branch points, the wires shall not be subjected to mechanical stress, and joints shall be minimized. The wire must be firmly and securely connected to the electrical terminal. For large-cross-section wires, terminal fittings made of the same metal as the wire should be used; when connecting copper and aluminum terminals, the copper terminal should be tinned. 　(6) When passing wires through a wall, they should be guided through pipes. The ends of the pipes running through the wall should extend at least 10 mm outside the wall surface. The insulation resistance of the wiring relative to ground should be no less than 1000 Ω/V.

(1) The voltage rating of the conductor used in the circuit should be one level higher than the operating voltage of the circuit； Its insulation layer shall meet the wiring installation method and environmental conditions of installation ； The safe current for the cross-section should be determined based on the electrical load current and the requirements for mechanical strength. 　　(2) The pipeline should be kept away from heat sources and heat-generating objects (such as chimneys, steam pipes, etc.). If passage is necessary, the temperature around the wire must not exceed 35°C, and insulation measures must be taken. 　　(3) All exposed wiring should be laid horizontally and vertically ； The horizontal height of the conductor above the ground should be no less than 2.5 m, and for vertical lines it should be no less than 1.8 m. If these requirements are not met, protection measures must be implemented to prevent mechanical damage. 　　(4) Wires cross each other during open wiring. All must be fitted with insulating sleeves or isolated. 　　(5) At connections and branch points, the wires shall not be subjected to mechanical stress, and joints shall be minimized. The wire must be firmly and securely connected to the electrical terminal. For large-cross-section wires, terminal fittings made of the same metal as the wire should be used; when connecting copper and aluminum terminals, the copper terminal should be tinned. 　　(6) When passing wires through a wall, they should be guided through pipes. The ends of the pipes running through the wall should extend at least 10 mm outside the wall surface. The insulation resistance of the wiring relative to ground should be no less than 1000 Ω/V.

Q&A: What are the general requirements for indoor wiring? Answer: Regardless of the wiring method, it should meet the requirements of safety and reliability, economic Reasonableness, ease of use, and ease of maintenance. The general technical requirements are as follows: 1) Requirements for the wires to be used: Their rated voltage should be no less than the operating voltage of the circuit; their insulation layer should meet the conditions of the circuit’s installation method and the surrounding environment; their cross-sectional area should satisfy the requirements regarding power supply and mechanical strength.   2) The wires should be replaceable, and the connection and branching points of the wires should not be subjected to mechanical forces.  3) The number of conductor joints in the circuit should be minimized to reduce failure points.   4) The connection between the wire and the electrical terminal must be tight and secure, in order to minimize contact resistance and prevent detachment.   5) The wiring should avoid heat sources as much as possible and should not be laid on heated surfaces.   6) Lines laid horizontally must be at a height of no less than 2 meters above the ground, and lines laid vertically must be at a height of no less than 1.8 meters above the ground; otherwise, devices to prevent mechanical damage must be installed.   7) The installation location should be convenient for inspection and maintenance. To prevent electric leakage, the resistance of the circuit to ground should not be less than 0.5 MΩ.

(1) The voltage rating of the conductor used in the circuit should be one level higher than the operating voltage of the circuit； Its insulation layer shall meet the wiring installation method and environmental conditions of installation ； The safe current for the cross-section should be determined based on the electrical load current and the requirements for mechanical strength. 　　(2) The pipeline should be kept away from heat sources and heat-generating objects (such as chimneys, steam pipes, etc.). If passage is necessary, the temperature around the wire must not exceed 35°C, and insulation measures must be taken. 　　(3) All exposed wiring should be laid horizontally and vertically ； The horizontal height of the conductor above the ground should be no less than 2.5 m, and for vertical lines it should be no less than 1.8 m. If these requirements are not met, protection measures must be implemented to prevent mechanical damage. 　　(4) Wires cross each other during open wiring. All must be fitted with insulating sleeves or isolated. 　　(5) At connections and branch points, the wires shall not be subjected to mechanical stress, and joints shall be minimized. The wire must be firmly and securely connected to the electrical terminal. For large-cross-section wires, terminal fittings made of the same metal as the wire should be used; when connecting copper and aluminum terminals, the copper terminal should be tinned. 　　(6) When passing wires through a wall, they should be guided through pipes. The ends of the pipes running through the wall should extend at least 10 mm outside the wall surface. The insulation resistance of the wiring relative to ground should be no less than 1000 Ω/V.

Safe and reliable, cost-effective, easy to maintain, and convenient to use

Neat, beautiful, and in compliance with standards!

(1) The voltage rating of the conductor used in the circuit should be one level higher than the operating voltage of the circuit； Its insulation layer shall meet the wiring installation method and environmental conditions of installation ； The safe current for the cross-section should be determined based on the electrical load current and the requirements for mechanical strength. 　　(2) The pipeline should be kept away from heat sources and heat-generating objects (such as chimneys, steam pipes, etc.). If passage is necessary, the temperature around the wire must not exceed 35°C, and insulation measures must be taken. 　　(3) All exposed wiring should be laid horizontally and vertically ； The horizontal height of the conductor above the ground should be no less than 2.5 m, and for vertical lines it should be no less than 1.8 m. If these requirements are not met, protection measures must be implemented to prevent mechanical damage. 　　(4) Wires cross each other during open wiring. All must be fitted with insulating sleeves or isolated. 　　(5) At connections and branch points, the wires shall not be subjected to mechanical stress, and joints shall be minimized. The wire must be firmly and securely connected to the electrical terminal. For large-cross-section wires, terminal fittings made of the same metal as the wire should be used; when connecting copper and aluminum terminals, the copper terminal should be tinned. 　　(6) When passing wires through a wall, they should be guided through pipes. The ends of the pipes running through the wall should extend at least 10 mm outside the wall surface. The insulation resistance of the wiring relative to ground should be no less than 1000 Ω/V.