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Behind the living room sofa, what is the box with many wires inside the wall?

2 [YJV22-4 * 185] -SC150-FC is the representative of the two YJV22-4 * 185 cable at the same time wear SC150 mean? Or are they wearing two tubes? why? More

Answer:

Steel pipe and its accessories and other accessories, should be anti-corrosion treatment, the tube back and forth with a wire twist round steel wire brush rust, buried in the concrete pipe surface should not be painted
Heat shrink tube and cable support: . the main insulation between the cable core, the exposed wire and the whole set of insulation with the original layer of not less than 20mm, tightened after the outer jacket; . The same with the original outer layer of the intersection of not less than 20mm, if possible where the moisture immersion, the intersection needs to be coated (heat shrink tubing) sealant. Heat shrink tubing and cable supporting the use of specifications:
Ming Fu in the wet places and dark deposited pipe, should be thick-walled tube Drying occasions can be used thin-walled steel pipe, piping should be along the shortest route, and minimize the number of bending Steel pipe in the laying before the nozzle should be polished smooth Pipe leads to the ground, the ground from the need to be greater than 200mm, outdoor nozzle application of waterproof elbow, indoor nozzle should be tightly packed When the pipe is laid vertically, the wire should be fixed in the junction box In addition to the voltage below 36V, the same equipment and the same pipeline power control circuit, three-phase four-wire lighting circuit, different voltage, different circuits, different frequency of the wire should not wear in the same tube Steel pipe and steel pipe, steel pipe and junction box, the general use of thread (pipe hoop) connection, and with a jumper into one
Electrical discharge pipe in the installation of steel pipe wiring, should be noted that can not be used in places with severe corrosion

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