The total cross-sectional area of the conductor in the pipe (including the outer sheath) shall not exceed 40% of the cross-sectional area of the pipe, which can be referred to the following table: a.
i.
Fixing Socket Cross Pin Nail Plate
The installation shall be in the form of hanger and bracket.
When the copper conductor is connected, the number of winding turns of the conductor is less than 5.
e.
The bending radius of the conduit shall not be less than 6D for open laying and not less than 10d for concealed laying.
Section 10mm ² Single strand copper core wire with section of 2.5mm and below ² Multi strand copper core wires of and below can be directly connected with the wiring terminals of electrical appliances, but the multi strand copper core shall be tightened first and then connected after tinning.
L1 phase is yellow, L2 phase is green, L3 phase is red, N line is light blue, and PE protection line is yellow and green.
If the joint is not flat and tight, it shall be wrapped again according to the process requirements.
Line inspection and insulation telemetering A.
the spacing between horizontal strong current cable tray and bracket shall not be greater than 2m.
The insulation resistance of lighting lines is not less than 0.5m Ω, and that of power lines is not less than 1m Ω.
The muddy water in the pipeline shall be cleaned in time or the conductor shall be replaced.
Wire laying: A.
b.
The conductor shall not have joints or kinks in the pipe or trunking.
Lines with different systems, different voltage levels and different current categories shall not be threaded in the same pipe or the same slot in the trunking.
g.
Unqualified connecting button and too short margin of wire core cutting will cause its loose support and cumbersome core cutting too long, which will lead to exposed wire core.
Sida & Jianghai enterprise medical special project and nondestructive testing project integrated contractor service provider like to prepare insulating wire specifications and models for our standard star I, construction process II, electrical wiring 1, materials before construction, which must meet the design requirements and have factory certificate.
d.
The insulation resistance of the line is low.
k.
the fixed spacing of the trunking: the bottom plate shall not be greater than 500mm, the cover plate shall not be greater than 300mm, the bottom plate shall be fixed 50mm away from the terminal and the cover plate shall be 30mm away from the terminal.
c.
The pipe protective orifice is selected, and the general plastic parts are flame retardant.
If the protective mouth is damaged and inconformity with the pipe diameter, it shall be replaced in time.
The joints that are not connected according to the process requirements shall be removed and reconnected, tightly wound and compacted to ensure reliable contact.
The yellow and green two-color insulated multi strand copper core wire shall be used as the grounding wire.
The degree of flattening shall not be greater than 10%.
b.
When laying wires in trunking, they shall be fixed according to the specified distance and marked with number marks.
Process flow: wire selection → pipe cleaning → threading → setting out and breaking → binding band mouth protection of wire and belt → wire connection → wire welding → wire binding → line inspection and insulation shake test.
The corresponding blade of wire stripper shall be selected according to the wire diameter.
Water may enter the pipeline or the insulation layer may be damaged, which will cause the insulation resistance of the line to be low.
After the casing is crimped, the position of the die is not on the center line, the die is not matched and the depth is not enough, so the qualified die shall be selected for crimping.
When the trunking is connected with the electrical base, the base shall press the trunking head, and the conductor shall have allowance.
If it must be connected, it shall be connected in the junction box.
The soldering tin temperature should be appropriate, and the rinsing tin should be uniform.
during construction, there are phenomena such as missing, falling off, damage and inconformity with the pipe diameter of the protective mouth.
The terminal blocks with corresponding specifications to the number of conductors and total section shall be selected.
Junction boxes shall be added every 45 meters when there is no bend, every 30 meters when there is one bend, every 20 meters when there are two bends, and every 12 meters when there are three bends.
The soldering tin at the wire connection is not full, and there are phenomena such as faulty soldering and slag inclusion.
For specific installation, refer to national standard 86sd169 and the installation details provided by the tray manufacturer.
The damage of wire core is caused by excessive force and improper use of wire stripper.
Insulation telemetering: megger with 500V range of 0-500m Ω is generally used for insulation telemetering of lighting lines.
f.
If the protective mouth is missing or falling off due to careless operation, it shall be supplemented in time.
b.
line inspection: after the connection, welding and wrapping are completed, self inspection and mutual inspection shall be carried out to check whether the wire connection, welding and wrapping meet the design requirements and the provisions of relevant construction acceptance specifications, quality and inspection and evaluation standards.
2.
The following lengths of wires in the vertical conduit shall be fixed in the nozzle or junction box: every 30 meters for those with a section less than 50mm, every 20 meters for those with a section of 70 ~ 95mm2, and every 18 meters for those with a section of 120-240mm2.
3、 Installation of cable tray and trunking a.
f.
If they do not meet the requirements, they shall be corrected immediately, and telemetering shall be carried out after the inspection is correct.
The screw connection button is loose and the wire core is exposed.
Qualified products corresponding to the cross section and number of wires shall be selected, and the reserved length of wire core shall be 1.2m.
The conductor color separation method is adopted for construction.
If the tin brushing of multiple strands of soft copper wire is missing, the tin shall be repaired in time.
Over 2.5mm ² The terminal of multi strand copper core wire shall be connected with the terminal of electrical equipment after welding or crimping the terminal.
b.
Quality problems that should be paid attention to in project construction a.
The overall layout of cable tray and trunking shall be the shortest, economical, reasonable and safe operation, and shall meet the requirements of installation, cable laying and maintenance..
i.
d.
h.
There shall be no creases, pits, cracks, etc.
Before threading the pipe, the accumulated water and sundries in the pipe shall be removed, and the pipe orifice burr shall be polished smooth.
j.
When laying the trunking, the bottom and cover interfaces shall be staggered by 20mm.
j.
g.
h.
1.
Wires shall be used in strict accordance with the specified color, so that the color of phase line, zero line and ground line of the whole project is always consistent.
c.
at the bend of the conduit.
e.
After rinsing tin, cloth should be used to wipe off the excess flux, so as to keep the joint clean.
all wire pipes or trunking materials are flame retardant PVC plastic trunking pipes or galvanized wire pipes.
2.
c.
