Distribution counters, control cabinets, distribution box installation and acceptance of the master project

1, the metal frame and the basic steel of the cabinet, screen, table, box and tray must be grounded (PE) or PEN (PEN) reliable; open appliances with doors, doors and frame grounding terminals between the bare braided copper Connected, and logo.

2, low-voltage distribution cabinets, control cabinets (screen, Taiwan) and power, lighting distribution box (plate) should have a reliable electric shock protection. The protective conductor in the cabinet (screen, desk, box, plate) shall have exposed terminals for connecting the external protective conductor. When the design is not required, the minimum cross-sectional area Sp of the protective conductor in the cabinet (screen, desk, box and disk) shall not be less than Table 2 requirements.

3, handcart, pull out the power distribution cabinet push-pull should be flexible, no jamming collision phenomenon. Moving contact with the center line of the static contact should be the same, and the contact close contact, input, the ground contact before the main contact contact; exit, the ground contact after the main contact disconnect.

4, high-voltage switchgear must comply with the relevant provisions of the transfer test pass, and should meet the following requirements:

â‘  relay protection components, logic components, transmitters and control computers and other single-qualified check, the entire group of test action is correct, the tuning parameters meet the design requirements;

â‘¡ Where approved by the legal procedures, into the market put into use the new high-voltage electrical equipment and relay protection devices, according to the technical requirements of the product transfer test.

5, low-voltage switchgear distribution switchgear must comply with the relevant provisions of the rules.

6, cabinet, screen, table, box, disk line between the line and line to ground insulation resistance, feed line must be greater than 0.5MΩ; secondary loop must be greater than 1MΩ.

7, cabinet, screen, table, box, disk between the secondary circuit AC frequency withstand voltage test, when the insulation resistance is greater than 10MΩ, with 2500V megger oscillation test 1min, there should be no flashover breakdown phenomenon; when the insulation resistance Value of 1 ~ 10MΩ, do 1000V AC power frequency withstand voltage test, time 1min, there should be no flashover breakdown phenomenon.

8, DC screen test, the screen electronic devices should be withdrawn from the line, the detection of the main circuit line and line to ground insulation resistance value should be greater than 0.5MΩ, DC panel attached battery charging, discharging should be consistent with product technical documents Requirements; Rectifier control and output characteristics of the test should be consistent with product technical documentation requirements.

9, lighting distribution box (plate) installation should meet the following requirements:

① box (plate) wiring neat, no twist phenomenon. Wire connection is tight, do not hurt the core wire, constantly shares. Washer screws under the pressure on both sides of the same cross-sectional area of ​​the same terminal on the wire connection is not more than 2, lock washers and other parts complete;

â‘¡ box (plate) switch flexible and reliable, with a leakage protection circuit, the leakage current protection device operating current is not more than 30mA, the action time is not greater than 0.1s.

â‘¢ Lighting box (plate), respectively, set the zero line (N) and the protection of the ground (PE line) bus, zero line and the protection of the ground allocated by the bus.

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