Requirements for high voltage parallel lines

Requirements for high voltage parallel lines

1. Installation position of distribution box: it should be installed in a well-ventilated and easy-to-operate position, which is convenient for daily operation and maintenance. The height from the bottom of the box to the ground should be1.8m. Generally, the original distribution box cannot be moved. If it is necessary to move, it is necessary to install a transition box, and the design and construction personnel will determine the scheme and move under the guidance of professionals.

2. The wires entering the box must have a certain length, and not less than < 150mm, so as to prepare for the installation and maintenance of switches and sockets and the replacement of wires in the future.

3. Line color code: The distribution box and the wiring of each loop shall be color-coded as required. L 1 phase is yellow, L2 phase is green, L3 is red, neutral line (n) is black, grounding line (PE) is yellow-green double-color line, and lamp cap line is white.

4. Section requirements of grounding wire (PE): the cross-sectional area of phase wire is below 16mm2, and the cross-sectional area of PE wire is the same as that of phase wire. The cross-sectional area of PE line above 16m2 is half of that of phase line.

5. Wiring principle in the pipe: horizontal and vertical, the pipe groove shall be chiseled and discharged into the special flame-retardant electric conduit with the pipe wall > >1.5 mm. The conduit must be fixed with wooden pegs in the conduit, and the junction between the conduit and the conduit shall be locked with a lock. Conductors must be inserted after conduit laying, and the grooving depth is 1.5 times the pipe diameter.

6. When laying pipelines, the number of bent pipes should be reduced as much as possible. Extra-long pipes must be added with transition boxes. Elbows must be bent with springs, and 90 elbows and tees are not allowed. Pipe connections shall be made by binding.

7. When laying pipelines, the number of bent pipes should be reduced as much as possible. Extra-long pipes must be added with a box. Now elbows must be bent by springs, and 90 elbows and tees are not allowed. Pipe connections shall be made by binding.

8. It is forbidden to directly lay the conduit under the composite floor, carpet and floor tile in the kitchen and bathroom. The conduit laid under the floor must be fixed.

9. The total cross section of the wires entering the conduit shall not be greater than 40% of the effective area of the conduit hole. According to the use requirements, the total number of wires in the conduit shall be ≤3, and there shall be no joints and kinks in the conduit.

10. Check the leakage protector and air switch: Check the leakage protection switch, and the power supply can be cut off when the leakage is 30mA, and the action time should be ≤ 0.1s. Check the number and capacity of air switches. If it cannot meet the requirements, it must be replaced or added. Lighting electricity must be equipped with bipolar short-circuit protector, which is not controlled by the main switch of leakage protector. Air conditioners, vacuum cleaners and other outlets above 15A, as well as the commonly used five-hole outlets of 10A, must be controlled by the main switch leakage protector in addition to a unipolar short-circuit air switch.

1 1. air conditioning: the power cord below two (including two) units is 4mm2, and the socket is 16A. The power cord of all three machines is 4mm2. More than 5 air conditioning cabinets must be powered by three-phase five-wire system, and the main line should be at least 6mm2 flexible wires, with emphasis on grounding wire connection.

12. The diameter of the separate branch line for installing Yuba in the bathroom is 2.5mm2, and the socket beside the water source is splash-proof. The diameter of the independent branch line in the kitchen is 2.5mm2 (if there are high-power appliances, the cross-sectional area of the conductor needs to be increased).