Low voltage PDC installation requirements and specifications

When selecting a low-voltage distribution device, it should meet the nominal voltage, frequency and calculated current of the network where it is located, and also meet the dynamic and thermal stability under short circuit condition ‌.

‌ The convenience of operation, handling, maintenance and testing of the equipment shall be taken into account in the layout of the distribution unit ‌.

‌ The installation height of the low-voltage PDC should be 1.4m above the ground when the PDC is hidden, 1.2m above the ground when the PDC is open, and 1.8m below the ground when the watt-hour meter is open ‌.

‌ distribution box, switch box box material is generally selected ‌ steel plate or ‌ insulation board, should not be used wooden material ‌.

‌ The vertical distance between the bottom of the fixed distribution box and the switch box and the ground shall be greater than 1.3m, less than or equal to 1.5m; The vertical distance between the bottom of the mobile distribution electrical box and the switch box and the ground shall be greater than or equal to 0.6m, less than or equal to 1.5m‌.

Specification standard

‌ standard configuration of distribution equipment including, ‌, ‌ main switch current transformer, voltage transformer, switch, ‌, ‌, ‌ circuit breaker air fuse, ‌, ‌ contactor relays, electric meter, ammeter, voltmeter, and ‌, ‌ thermal relay

‌ Paint the outer wall of the distribution box with anti-corrosion oil. Paint the inner wall and panel with two coats of gray paint. Iron distribution boxes should be coated with camphor oil before painting ‌.

‌ When measuring instruments and transformers are installed on the switchboard, use the copper core conductor ‌ with a cross-sectional area of not less than 1.5mm² for the conductors at the secondary side.

‌ The conductor behind the disk shall be covered with soft plastic sleeve in phase sequence color, yellow for U phase, green for V phase, red for W phase and black for neutral line ‌.

‌ The door of the power distribution box should be equipped with a lock. Do not connect or plug other temporary electrical equipment in the power distribution box and the switch box. Do not place any foreign objects ‌.