Distribution box wiring requirements

The upper end enters the line, the lower end exits the line, the main loop is on the left, the control loop is on the right, and the horizontal is vertical.

There are clear wire and dark wire, the sheath can be used to walk the sheath wire, or the pipe, the threading groove, the dark coating is mostly through the pipe, hidden in the building wall or the decorative wall, generally up or up or up and down the line .

Before the installation and installation of the power distribution cabinet, the environment inside the control room should have the conditions, all the interior decoration construction has been completed, and the indoors are clean and safe.

1 After the power distribution cabinet is transported to the site, the organization will open the box to check whether there is any deformation or paint fading, whether the instrument components are complete, spare parts, instructions, etc. are defective, and the unpacking records are made.

2 According to the layout of the construction drawing, the switch cabinet is placed on the basic section steel in order. After the cabinets are in place, first find the cabinets at the two ends, and then stretch the small lines at the height of the upper two-thirds of the cabinet, and align them one by one, with the counter as the standard. Use a 0.5mm gasket to adjust the timing, and each gasket should not exceed three.

3 After the position is corrected, fix it according to the size of the fixing screw hole of the cabinet. The cabinet and the cabinet, the cabinet and the side baffle are all connected by galvanized screws. The high and low voltage switchgears are firmly welded with the reserved angle steel. The exposed parts of the cable interlayer are covered with patterned steel plates. The front and back of the cabinet are covered with 1200mm×10mm (width×thickness).

4 The horizontal deviation of the top of the two cabinets is not more than 2mm, the horizontal deviation of the top of all cabinets is not more than 5mm, the unevenness of the adjacent two cabinets is not more than 1mm, the unevenness of all cabinets is not more than 5mm, the indirect seam of the cabinet is not More than 2mm.

5 After the device is positioned, tighten and inspect the internal fasteners again, especially at the end of the conductor connection. After the wiring in the cabinet is completed, use the vacuum cleaner to remove the sundries in the cabinet, keep the inside and outside of the equipment clean, and accurately identify the equipment number and circuit number.

After the distribution cabinet is installed, install the bridge above the cabinet. The position of the opening and exit of the power distribution cabinet is reserved by the supplier according to the size. Closed after the cable is laid. The bridge and the grounding busbar in the cabinet are reliably grounded with a dedicated grounding wire. The bridge and the distribution box (cabinet) are connected by rubber plates to protect the wires and cables. The secondary circuit wiring distribution cabinet shall complete the secondary circuit wiring and related testing tests in the cabinet before leaving the factory. After the distribution cabinet equipment arrives at the site, it shall be organized and accepted in time under the supervision and guidance of Party A's on-site engineers and supervisors. The relevant technical documents shall be complete, the distribution cabinets shall be packed and sealed well, the components shall be complete and the wiring shall be reliable. After the power distribution cabinet is installed and fixed, the secondary wiring circuit of the power distribution cabinet should be insulated and tested one by one. The test uses 500V grade insulation test instrument, and the test result requirement is greater than 1MΩ. All secondary circuit control lines or cables are made of multiple strands of soft copper wire. The terminals are soldered with special crimping tongs after the tin is soldered. Neutral solder should be used for hot tin.

other request:

1 drawer type switchgear installation must meet the following requirements: a, drawer push and pull flexible and lightweight, no jamming, collision phenomenon; b, moving contact and static contact centerline, contact contact tight; c, drawer machinery The interlocking or electrical interlocking device operates correctly and reliably, and the isolation contacts can be separated after the circuit breaker is opened; d, the grounding contact between the drawer and the cabinet is in close contact; when the drawer is pushed in, the grounding contact ratio of the drawer is The main contacts are first contacted, and the procedure is reversed when pulled out.

2 Before the secondary circuit insulation test of the power distribution cabinet, carefully check the design drawings, and the vulnerable components in the cabinet should be disassembled beforehand.

3 During the installation process of the power distribution cabinet, the paint layer should be complete, no damage, and the lighting in the cabinet is complete.

4 The substation indoor equipment enclosure needs to be well grounded.

Although the installation steps seem cumbersome, each step is indispensable. Only by following the above steps can you ensure that the installation of the power distribution cabinet is completed.