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Anti-static grounding notes.

Anti-static grounding notes.

Issue Time:2020-10-14
Anti-static grounding notes

The metal sampler, calibration ruler, and temperature detector should be grounded via a conductive rope. In order to avoid rapid discharge, the resistance between the two ends of the sampling rope should be 107~109Ω.

The electrostatic grounding electrode resistance is required to be no more than 100Ω, and the contact resistance of the pipeline flange connection is no more than 10Ω. Notes and requirements for anti-static grounding:


Notes


Grounding is used to eliminate static electricity on conductors, but cannot be used to eliminate static electricity on insulators. Since an insulator with static electricity is directly grounded through a conductor, it is equivalent to directing the ground potential to the insulator, which will increase the risk of spark discharge, so the method of anti-static grounding is only suitable for conductors.

The anti-static grounding device can be shared with the work, protection and repeated grounding devices of electrical equipment. The ground connection wire should ensure sufficient mechanical strength and chemical stability. The connection should be reliable without any interruption. The anti-static grounding resistance value should usually not exceed 1MΩ.


The conductive ground is essentially a grounding measure. Using it can not only lead away the static electricity on the equipment, but also help to lead away the static electricity accumulated on the human body. Conductive ground often refers to ground such as concrete, conductive rubber ground, conductive synthetic resin, conductive wood, conductive terrazzo, and conductive ceramic tiles. When using conductive ground or conductive paint to spray the ground, the resistance between the ground and the ground should not exceed 1MΩ, and the contact area between the ground and the grounding conductor should not be less than 10cm2.


In some dangerous places, in order to reliably ground the shaft, conductive lubricating oil can be used or slip rings and carbon brushes can be grounded.

In order to eliminate the static electricity of the human body, you can wear conductive work shoes (such as leather-soled shoes or conductive rubber-soled shoes), which is essentially a grounding measure. The resistance of conductive work shoes should be 10MΩ.


By the way, in order to prevent the human body from being injured by static electricity, you should avoid wearing silk or synthetic fiber clothes in the workshop, especially in places with explosion or fire hazards. In addition to explosion-proof measures for electrical equipment and strict implementation of relevant rules and regulations, workers should be careful not to wear clothes, gloves, socks or scarves made of acrylic, nylon, polyester or their blends, and the tools should be used as much as possible do not use plastic or nylon products to eliminate possible fire or explosion hazards caused by static electricity to prevent accidents.