The lightning protection grounding resistance is within 4 ohms.
The lightning protection grounding resistance value is the grounding resistance in a grounding system used to protect against lightning strikes. The grounding resistance is the resistance between the grounding electrode and the ground, which plays a key role in effectively introducing lightning or other currents into the ground.
According to International Electrotechnical Commission (IEC) specifications, different types of grounding systems have different grounding resistance requirements. General buildings According to the IEC 60364 standard, the grounding resistance for general buildings should be less than 10 ohms. For high-rise buildings, the grounding resistance requirement is lower in order to better protect the building and personnel from lightning strikes. Generally the grounding resistance is required to be less than 5 ohms or less.
For locations that are very sensitive to electromagnetic interference and lightning strikes, such as medical facilities, electronic equipment manufacturing plants, etc., grounding resistance requirements are often more stringent and may need to be 1 ohm or less.
It is important to note that grounding resistance measurements need to be made with specialized test equipment and should be performed under appropriate geological and environmental conditions to ensure accuracy and reliability.
In short, the requirement of lightning protection grounding resistance value varies according to different places and needs, but the general requirement is that the grounding resistance is less than 10 ohms. Specific requirements should be determined according to relevant standards and codes and tested under appropriate conditions.
The role of lightning protection grounding resistor
1, dispersal of lightning energy: when lightning strikes a building or other facilities, lightning protection grounding resistor can be effectively dispersed into the ground through a good grounding connection. This can avoid the direct damage of lightning to buildings and equipment.
2, protection of equipment and personnel safety: grounding resistors can safely direct lightning energy to the ground, reducing the risk of lightning damage to equipment and personnel injury. A safer working environment can be provided through proper grounding system design.
3. Stabilize equipment operation: When lightning strikes a building or equipment, it may cause transient changes in voltage and current, resulting in equipment failure or damage. Through a good grounding system, can effectively disperse and dissipate these voltages and currents, to maintain stable equipment operation.
4, to protect the telecommunications system: lightning grounding resistance is very important for the normal operation of the telecommunications system. It can provide good grounding protection to avoid lightning interference and damage to telecom equipment and communication lines.