GB 50057-2010 第5.4.2条
| **** | **Grounding electrode materials**: When hot-dip galvanized angle steel is used for artificial vertical grounding electrodes, the thickness shall not be less than **4mm**; when hot-dip galvanized steel pipe is used, the wall thickness shall not be less than **3.5mm**. When hot-dip galvanized flat steel is used for horizontal grounding electrodes, the cross-sectional area shall not be less than **90mm²** and the thickness shall not be less than **4mm**; when round steel is used, the diameter shall not be less than **10mm**. |