GB 50057-2010 第4.4.3条
| **** | **Equipotential bonding**: All metal pipes, cable metal sheaths, building metal components, etc. entering or exiting the hotel building shall be connected to the grounding device at the **main distribution box and main equipotential terminal box**. The main equipotential terminal box shall be connected to the grounding device, with a connecting conductor cross-sectional area of not less than **25mm²** copper conductor. |