Importance of Grounding The Anti-static Raised Floor
Why anti-static raised floor should be grounded?
Many enclosures or connections of electrical equipment can cause electric shocks and injuries in daily wear. Therefore, in a neutral-grounded system, the current may flow through the neutral point of the human body to the ground which allows current to flow into the earth.
In a parallel circuit, the current value through each branch is inversely proportional to the resistance. The smaller the resistance of the equipment connected to the underground, the smaller the current through the human body and the damage to the human body can be minimized. When the shell is touched on the ground, the voltage to the human body is very low, so that there is no danger.
Therefore, the installation of anti-static grounding devices is the most effective measure to avoid electric shock.
How to ground the anti-static raised floor?
In areas with strict anti-static requirements, it is necessary to ground the anti-static raised floor. There are two connections while grounding raised floor, one is the connection between raised floor and understructures(stringers and pedestals), another is the connection between pedestals and ground.
1.Connection between floor and understructures
There are several ways to connect raised floor and understructures, for installation convenience, the most popular way we are using is bonding clips which is copper. We installs bonding clips on the edge of raised floor when we are producing. When the workers are doing installation at project site, raised floor can be put on stringers directly. Bonding clips will connect raised floors and stringers by itself.
2.Connection between pedestals and ground
Conductive copper foil strips can be installed under pedestals to enhance the conductive effect. They are arranged horizontally and vertically under pedestals. The commonly used specifications of copper strips are 2×0.05 mm, 4×0.08 mm, and 6×0.5 mm. Different requirements for anti-static environment use different specifications according to design requirements construction.
Generally, copper foil strips are attached to the ground in a predetermined size to form a mesh. The intersection of the copper foils needs to be bonded with a conductive adhesive. So that it can ensure continuity between the copper foils. Then use a megohmmeter to measure the resistance between adjacent copper foils. If there is any problem, you need to find out the reasons for re-adhesion to ensure continuity between copper foils. Based on the size of the room, the number of points connected to the grounding wire (at least four points per hundred square meter) is determined in the pasted copper foil mesh.
The copper is usually used in combination with soft copper strips to achieve grounding. The bronze medals are fixed to the ground as required. One end of the copper strip is connected to the copper bar and the other one is connected to the floor leg. The conductive paste is applied at the connection and the copper bar is reserved with the building. The grounding point can be connected.
Notes
Grounding avoid as much as possible where there are instrument with precision signals, because it may disturb static electricity when discharged. Not only that, but also separate from the lightning protection grounding equipment. Because it will produce a counter-attack voltage when the lightning current is released. When the protection area is protected from static electricity, it can damage the equipment.
