Employees (operators) wearing synthetic clothing and moving around easily generate static discharge. Additionally, the friction, mixing, and movement of packaging products or equipment, as well as air friction in high-temperature rooms, can also produce static electricity. The static electricity can easily cause electronic components to break down and burn, affecting the accuracy of detection equipment and instruments, and can also cause computer systems to malfunction. The sparks produced by static electricity are sufficient to ignite and explode flammable and explosive gases like natural gas, oil, and alcohol. Therefore, proper grounding is required for equipment, containers, and pipelines prone to static electricity generation, as well as for production processes that are prone to static. Grounding refers to making an electrical connection between a specific point in a system, device, or equipment and the local ground (earth). Thus, the smaller the resistance, the faster the current flows, and the higher the level (or safer) of equipment (or grade) that can be protected. Furthermore, good grounding can effectively reduce static noise in computer systems caused by potential variations.

Types of grounding: Work grounding, protective grounding, anti-static grounding, lightning protection grounding, multiple grounding, equipotential grounding, shielding grounding, signal grounding for electronic equipment, power grounding for electronic equipment, etc.

Based on international and domestic standards, the static grounding resistance values (earth resistance values) are categorized into three grades:

        ①.≤1Ω; ②.≤4Ω; ③.≤10Ω; 

General Requirements:

Communication working ground: ≤4Ω

Safety protection ground: ≤4Ω

Anti-static grounding: ≤4Ω

Surge Protection and Grounding: ≤10Ω

Factories or laboratories can choose the appropriate grounding resistance value according to their own environmental requirements.

Suggestion: The general factory grounding resistance should be ≤10Ω (but the grounding resistance should be ≤4Ω if all equipment needs to be connected). For example, in chemical factories (factories producing hazardous chemicals) and factories producing and processing flammable and explosive gases, the grounding resistance should be required to be ≤4Ω or higher. For electronic factories, semiconductor factories, inspection laboratories, and computer systems (cleanroom 100 or above, with electronic components withstand voltage not exceeding 100V), the grounding resistance should be required to be ≤4Ω or higher.

Guangzhou Lihuang Antistatic Technology Co., Ltd. has extensive experience in the construction and renovation of static grounding and indoor wiring systems. We have professional technical staff and construction teams that can provide technical references based on your production or safety environment, and suggest the appropriate resistance value for the standard level. Welcome manufacturers and companies to consult and place orders. Thank you!