GB 50057-2010 第4.2.2条
| **** | **Grounding resistance value**: When the lightning protection grounding device of a hotel building is shared with the electrical system, the grounding resistance shall not exceed 1Ω (according to Clause 4.2.2 and Clause 6.1.2; in practice, hotels usually adopt a common grounding system). If the lightning protection grounding is installed independently, the impulse grounding resistance shall not exceed 10Ω (Class II lightning protection) or 30Ω (Class III lightning protection). |