The electrical parameters of the components installed in the low-voltage distribution cabinet shall meet the requirements of the rated parameters of the equipment. If the short-circuit withstand strength or breaking capacity of the element is insufficient to withstand the stress that may occur in the installation site, the element shall be protected by current limiting protection devices (such as fuse or circuit breaker).
安裝在同一支架（安裝板、安裝框架）上的電器元件和外接導線端子的布置應使其在安裝、接線、維修和更換時易于接近，尤其是外部接線端子應安裝在裝置基礎面上方至少0.2m,并且端子的安裝應使電纜易于與其連接。低壓配電柜內由操作人員觀察的指示儀表不應安裝在高于設備基礎面2m處。操作器件，如手柄、按鈕等，應安裝在易于操作的高度上，其中心線一般不應高于設備基礎面2m。緊急操作器件應盡可能安裝在距離地面0.8 - 1.6m的范圍內。
The arrangement of electrical components and external conductor terminals installed on the same support (mounting plate and mounting frame) shall make them easy to access during installation, wiring, maintenance and replacement. In particular, the external wiring terminal shall be installed at least 0.2m above the basic surface of the device, and the terminal shall be installed so that the cable can be easily connected with it. The indicating instrument observed by the operator in the low-voltage distribution cabinet shall not be installed 2m higher than the equipment foundation surface. Operating devices, such as handles and buttons, shall be installed at a height easy to operate, and the center line shall generally not be 2m higher than the equipment foundation surface. Emergency operating devices shall be installed within 0.8 - 1.6m from the ground as far as possible.
Normal temperature rise, aging of insulating materials and vibration during normal operation shall not cause abnormal changes in the connection of current carrying parts, especially considering the thermal expansion and electrochemical corrosion of different metal materials and the impact of actual temperature on material durability. The connection between current carrying parts shall ensure sufficient and lasting contact pressure.
The selection of conductor cross-sectional area in low-voltage distribution cabinet shall consider the following factors: bearing current, mechanical stress, conductor laying method, insulation type and type of connected components.
The insulated conductor in the low-voltage distribution cabinet shall not be lower than the rated insulation voltage of the corresponding circuit. The wires between two connecting devices shall not have intermediate joints or welding points, and shall be wired on fixed terminals as far as possible. Insulated conductors shall not be supported on exposed live parts with different potentials and edges with sharp corners, and appropriate methods shall be used to fix the insulation. The conductor connecting the electrical components on the cladding or door and the measuring instrument shall ensure that the movement of the cladding and door will not cause any mechanical damage to the conductor. Usually, only one wire can be connected to a terminal. When two or more wires are connected to a terminal, it is allowed only if the terminal is designed for this purpose.
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