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 disrupt computer systems. 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 electricity. Grounding refers to the electrical connection between a specific point in a system, device, or equipment and the local ground (earth). Thus, the lower the resistance, the faster the current flows, and the higher the level (or safer) of protection for the equipment (or grade). Furthermore, good grounding can effectively reduce static noise in computer systems caused by potential variations.

Types of grounding: including working grounding, protective grounding, static electricity grounding, lightning protection grounding, multiple grounding, equipotential grounding, shielding grounding, signal grounding for electronic equipment, power grounding for electronic equipment, etc.

According to international and domestic standards, static grounding resistance values (earth resistance values) are classified into three grades:

        ①.≤1Ω; ②.≤4Ω; ③.≤10Ω; 

General Requirements:

Communication Work Site: ≤4Ω

Safety Protection Ground: ≤4Ω

Anti-static grounding: ≤4Ω

Lightning Protection Grounding: ≤10Ω

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

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

Guangzhou Liying Anti-Static Technology Co., Ltd. has many years of experience in the construction and renovation of static grounding and indoor wiring systems. We have professional technical staff and construction teams, capable of providing technical references based on your production or safety environment, and recommending the appropriate resistance value standard. We welcome inquiries and orders from various manufacturers and companies, thank you!