Manufacturing and Installation of Cable Head Necessary for Electrical Installation 1. Wire threading pipes generally include: PVC pipe: PC20 Welded steel pipe: SC20 Galvanized steel pipe: SR Buckling galvanized thin-walled wire tube: KBG20 Compact galvanized thin-walled wire tube: JDG20 2. Circuit laying methods commonly used in electrical design and construction drawings: SR: Groove Laying along Steel Line BE: Laying along or across roof trusses CLE: Laying along or across columns WE: Laying along the wall CE: Laying along the ceiling or ceiling ACE: Installed in a ceiling that can enter a person BC: Covered in beams CLC: Secretly laid in the column WC: Secretly laid in the wall CC: Covered in the ceiling ACC: Covered in an inaccessible roof FC: Covered in the ground SCE: The metal pipe should be worn in the ceiling. 1. Representation of conductor through pipe SC-Welded Steel Pipe MT- wire tube PC-PVC Plastic Hard Pipe FPC-Flame Retardant Plastic Hard Tube CT- Bridge MR-metal slot M- wire rope CP-metal hose PR-plastic groove RC-galvanized steel pipe 2. Representation of laying ways of conductors DB- buried directly TC- cable trench BC-Covered in Beam CLC-Covered in Column WC-Covered in the Wall CE - Laying along the ceiling CC-Covered in Ceiling Roof Inside SCE-ceiling laying F-Floor and Underground SR- along the wire rope BE - along roof truss, beam WE - Open application along the wall 3. Representation of Lighting Installation Mode CS-Chain Crane DS- pipe crane W-Wall Installation C- suction top R- embedding S- stent CL- column Slot along steel line: SR Along or across a roof truss: BE Along or across columns: CLE Welded steel pipe laying: SC Thread-through Pipe Laying: MT Hard plastic pipe laying: PC Flame-retardant semi-rigid PVC pipe laying: FPC Cable bridge erection: CT Metal wire groove laying: MR Plastic groove laying: PR Laying with steel cables:M Laying of polyvinyl chloride plastic corrugated wire pipe: KPC Piercing metal hose laying: CP Direct Embedding: DB Cable trench laying: TC Labeling of Wire Laying Position Laying along or across beams (roof trusses): AB Covered in beams: BC Around or across columns: AC Secretly laid in the column: CLC Wall Laying: WS Secretly laid in the wall: WC Laying along ceiling or roof surface: CE Covered in roof or roof: CC Inside the ceiling: SCE Floor or or Underground Laying: FC 1. Number of switch boxes = number of switches + number of sockets 2. Number of junction boxes = Number of headboxes + Specification (1) No more than 30m non-bending pipeline; (2) When there is a bend between the two junction boxes, it shall not exceed 20m; (3) When there are two bends between the two junction boxes, they shall not exceed 15m; (5) When there are three bends between the two junction boxes, they shall not exceed 8m; (5) Four bends are not allowed between two junction boxes of concealed piping 3. Connection box A junction box (piping first) is used behind each open assembly box (piping concealed).The general distribution boxes of junction boxes are all terminal boxes of junction boxes. In general, there are only terminal boxes and no components. For example, branch junction boxes and equipotential junction boxes, the ground terminal boards are one of the terminal boards of the grounding terminal boxes. LEB is a local equipotential junction boxes. Generally, it is very small, and the terminal boards inside are also very small, and the terminal boards are seldom used for grounding cross-connection, such as the sections of the bridge and the wire pipes.The electrical auxiliary connection between the disconnected interfaces plays the role of conduction potential. Normally, it is used on lightning-proof grounding without current disconnection card. Generally, it is used on the lead-in line of artificial grounding pole. The main purpose is to disconnect the artificial grounding pole from the grounding network when measuring grounding resistance, so as to measure the grounding of this artificial grounding pole conveniently and accurately. Differentiation of Cable Head Installation I. Making and Installing Material for Cable Head It can also be divided into heat-shrinkable (currently the most commonly used one), dry-packed and epoxy resin casting type, now more than 70 mm2 cables generally use heat-shrinkable type, in fact, it is used to heat shrinkable head, a heat-shrinkable head in the tens to hundreds of yuan, that is, the so-called "glove" shape, like gloves, the cable protective l

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