Lightning protection resistance value
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When a combined grounding system is used for lightning protection, should the requirement for grounding resistance be 4 or 1?
According to design requirements, some values are set at 4Ω while others at 10Ω; it is not necessarily determined based on factors such as the environment or factory facilities.
The grounding resistance for lightning protection is generally less than 10Ω; a value of less than 4Ω is perfectly fine
Depending on the requirements, there are also those that require 0.5Ω
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It can be determined that when combined grounding is used in civil buildings, the resistance value is 1
The Code for Design of Lightning Protection of Buildings only specifies 10Ω; what standard is 4Ω based on?
The standard requirement is less than or equal to 4 ohms
Grounding includes equipotential grounding, lightning protection grounding, anti-static grounding, and electrical protection grounding. The resistance value of a standalone anti-static ground is generally 100 ohms ； The individual lightning protection grounding resistance is generally 10 ohms ； The individual electrical protection ground is generally 4 ohms ； The grounding for low-voltage systems is generally 1 ohm ； Then the combined grounding resistance is minimized ； For example, in cases where lightning protection, anti-static protection, and electrical protection share the same grounding system, 4 ohms is used ； For grounding systems shared between lightning protection and low-voltage systems, the grounding resistance should be 1 ohm ； I haven’t come across the 0.5 ohm value mentioned above yet.