GB 50057-2010 第4.3.6条
| **** | **Down conductors should preferentially use the reinforcement in the building's reinforced concrete or steel structural columns. When reinforcement in concrete or steel columns is used as natural down conductors, no separate test joints need to be provided, but several connection plates should be installed at appropriate locations indoors and outdoors for measurement, connection to artificial grounding electrodes, and equipotential bonding.** |