Wiring duct,Cable Gland,Cable Tie,Terminals,RCCN

First and second process:

1 Scope of application

 This code of practice applies to the secondary wiring of various 0.4kV~35kV switchgear electrical equipment.

2 Reference standard

     GB50171-1992 "Code for Construction and Acceptance of Electrical Installations for Panels, Cabinets and Secondary Circuits"

     GB7251.1-2005 "Low-voltage switchgear and control equipment Part 1 Type test and partial type test equipment"

     JB/T9661-1999 "Low-voltage withdrawable switchgear"

     GB/T11022-2006 "General technical conditions for high voltage switchgear"

     JB/T2436.1-1992 "Copper crimping end for wire 1st part: copper crimping end for 0.5~6.0mm2 wire"

     JB/T6330-1992 "TG1 type tubular end"

3 Equipment and tools

3.1 number printer

3.2 adjustable wrench 6 inch, 8 inch

3.3 flat head screwdriver, Phillips screwdriver (3 inch, 6 inch, 8 inch) and telecommunications screwdriver

3.4 diagonal pliers, wire strippers, needle-nosed pliers, round nose pliers

3.5 Electric iron 25W, 100W

3.6 cold crimping pliers 0.5~2.5(mm); 1,4,6(mm)

3.7 battery test light

3.8 Taps M4, M5, M6, M8

3.9 tape measure (2m)

3.10 Homemade casing M3~M6

4 materials and accessories

 BV, RV, RVVP copper core PVC insulated wire

 TU, TO, TG type tubular end

Nylon cable ties, wire tube, suction cup, porcelain sleeve, plastic line groove, rosin, solder, alcohol,

 Rubber protection ring, insulated wire clamp, corrugated hose, fasteners, copper washer, yellow wax tube.

5 basic requirements

5.1 Install the secondary components, terminal blocks and wiring correctly according to the screen layout and installation wiring diagram.

5.2 Bolt connection, plugging, welding or crimping between wires and electrical components shall be firm and reliable.

5.3 The wires in the cabinet and cabinet should not have connectors, and the conductor cores should be free from damage.

5.4 The end of the secondary insulated wire shall be marked with a number tube, the mark shall be correct, the writing shall be clear and unfavorable, and the content of the mark shall comply with the provisions of GB4884-1985 "Insulated Wire Marking".

5.5 The secondary wiring shall be horizontal, vertical, tidy, clear and beautiful, and the wire insulation shall be good and without damage.

5.6 The wiring of each terminal of each terminal shall be 1 and shall not exceed 2 (only for the terminal block if the terminal is designed for this purpose); when connecting two wires, bend the single wire A copper flat washer should be added to the middle of the eye socket when crimping.

5.7 Terminal strips should have a durable, clear serial number mark.

5.8 The connection of the secondary circuit (including the flat washer) shall be made of copper; the insulation shall have self-extinguishing flame retardancy.

6 secondary wiring process

Determine the routing scheme ® Downline ® Set of Line No. ® Traverse ® Stripping Head ® Pressure End ® Wiring ® Inspection

7 terminal block and component label

7.1 The beginning of the terminal block must be marked with a marking terminal for the name of the unit. Terminal terminals must be installed at both ends of the terminal block. When there are connecting pieces between adjacent terminals, they must be separated by a partition.

7.2 The terminals of the terminal block of each installation unit shall have sequential labels, and the writing must be clearly defined.

7.3 When the terminal block is difficult to install due to space constraints, it can be installed in two or more rows.

7.4 Only one wire can be connected to each terminal wiring screw. The connecting piece should be connected with a connecting piece. The screw without the wire must also be tightened.

7.5 Harness shall not subject the connected terminal block to mechanical stress.
7.6 Paste the component label according to the secondary wiring diagram (layout diagram). The label is generally attached to the metal frame in the middle of the component. If the label cannot be attached under the component, the appropriate position can be selected.

7.7 The font of the component label shall be correct, the writing shall be clear, and the content shall conform to the requirements of the drawings; the pasting part shall be conspicuous, and shall not be placed on the wire or component or the metal member, and clearly indicate that it belongs to a certain component.

8 check

8.1 After the secondary wiring, the wiring personnel should first conduct a self-examination, and then the inspector conducts a special inspection.

8.2 Check whether the wiring is correct. Check the terminal block from top to bottom one by one, and then check the connection between the electrical appliances.

8.3 Check the quality of the connection, whether the direction of the single-strand bent eyelet is correct, whether the crimping screw is tightened, whether the type of the cold-pressed end used by the multi-strand is correct, whether the quality of the crimping meets the requirements, and the insulation of the wire and the conductor have no damage.

8.4 Is the wiring of the secondary line straight and uniform, the quality of the cable, the bending radius of the wire, the label sleeve, the arrangement of the terminal block, the fixing of the wire harness, etc., whether the wire has reached the requirements, whether the material used in the same project is Consistent. 8.5 All components that are not wired are equipped with screws, nuts, washers, etc. and fastened

Second, the description:

1. When wiring resistors or other heating elements, two ceramic sleeves are added to the wire core. The distance between the harness and the resistor or heating element should be greater than 30 mm and laid underneath. There should be a distance of 90mm between the resistor and the resistor. In special cases, the harness can be tilted parallel or downward.

2. When the secondary wire needs to be soldered with a soldering iron, it is necessary to use rosin for welding, and no welding oil or hydrochloric acid is allowed.

3. The personnel in the component class should be in line with the wiring personnel to determine a reasonable routing plan according to the layout of the screen and the components and terminal block positions. The wiring should be consistent when the screen layout and the secondary plan are the same for each batch of products.

4. According to the design requirements of the secondary wiring diagram, the line number tube is printed by the line number printer, and the line number of the same batch of products should be the same. Then, according to the wiring diagram requirements, the wire number tube is sleeved on the wire. The direction of reading of the wire number mark is based on the front of the cabinet, from bottom to top and from left to right.

5, the wiring fixed with the suction cup must be horizontal and vertical to ensure that the wiring harness is properly fixed. The suction position of the suction cup must be avoided at the corner of the wire harness so that the wire harness is fixed in a straight position.

6. When the secondary connection of the handcart type switchgear is installed with the aviation plug, the circuit breaker cabinet must be a socket on the side of the cabinet. For the voltage transformer cabinet, the plug must be on the cabinet side.

7. The live display must use the shielded wire twisted wire, in which the shielded ground leads to the grounding of the terminal block to prevent other lines (such as the AC circuit from generating an induced voltage, resulting in a false indication of the live display).

8. For the measurement circuit, according to the requirements of national standards, the wires in the measurement circuit should be single-strand copper wire. For the current circuit not less than 4 square copper wire, the voltage circuit is not less than 2.5 square copper wire, and the phase color line is adopted. ABC corresponds to yellow-green red, and the grounding line adopts yellow-green two-color line.

9. When the wire is crimped to the end, all the wires are required to enter the end, and the thin copper wire is not allowed to remain outside the end, causing the secondary circuit to be short-circuited or the secondary circuit to withstand the pressure.