Employees (operators) wearing synthetic clothing and walking easily generate static discharge. Additionally, the movement of packaging products or equipment, as well as friction and stirring 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 from static electricity are also sufficient to ignite and explode flammable and explosive gases like natural gas, oil, and alcohol. Therefore, proper grounding is required for equipment, containers, and pipes prone to static electricity, as well as for production processes that generate static. Grounding refers to the electrical connection between a specific point in the system, device, or equipment and the local ground (Earth). Thus, the lower the resistance, the faster the current flows, and the higher the level of protection (or safety) for the equipment (or class). Moreover, good grounding can effectively reduce static noise in computer systems caused by potential variations.

Types of grounding: working grounding, protective grounding, static dissipative grounding, lightning protection grounding, redundant grounding, equipotential grounding, shielding grounding, signal grounding for electronic equipment, power grounding for electronic equipment, etc.

In accordance with 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: ≤4Ω

Static Dissipative Grounding: ≤4Ω

Lightning Protection Grounding: ≤10Ω

The factory or lab can choose the appropriate grounding resistance value based on their own environmental requirements.

Recommendation: The ground resistance value for general factories 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 that produce and process 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 above 100级, with electronic components having withstand voltage not exceeding 100V), the ground resistance value should be required to be ≤4Ω or higher.

Guangzhou Lihuang Antistatic Technology Co., Ltd. has years of 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!