Talking about the making method of the grounding wire in the computer room

In the grounding system, grounding wire production and installation is very important, the following for this introduction.

One, grounding resistance requirements:

1, resistance to less than 4 Ω.

The size of the grounding resistor can define the size of the grounding current, the smaller the grounding resistance, the lower the grounding voltage value of the grounding device. This means the size of the grounding resistance value, indicating the good and bad grounding performance of the equipment.

2, resistance measurement

Grounding resistance can generally be used ammeter-voltmeter, bridge method, grounding resistance measuring instrument, etc. to measure, are currently using grounding resistance measuring instrument to measure, this method is simple and convenient. The common grounding resistance measuring instrument used by

is ZC-8 type and ZC-29 type.

Second, the installation of the grounding device

Generally speaking, grounding wire buried underground depth should not be less than 2m. When the grounding pole is installed in a special place, if the depth is less than 2m, it should be placed around the ground with salt 8kg, about 30kg of wood carbon and add water to reduce the grounding resistance. If 2 and more than 2 grounding poles are used, the spacing between poles is less than 0.5m to reduce the Earth's diaspora resistance. In soils with strong corrosive behavior, copper or zinc-plated grounding electrodes shall be used. At the same time, grounding should not be buried in the garbage layer and ash layer area, laying in the ground of the earth should not be painted to avoid the grounding resistance too large.

Also:

Scenario One: Hit the pile

(1) in the vicinity of the computer room to 4 or more 2.5m angle (45mm*45mm) along the line into the ground 80cm, each angle is 2m apart. The

(2) uses flat steel (30mm*3mm) to weld 4 steel angles in series. The

(3) uses galvanized flat steel (30mm*3mm) to weld any angle of angle steel as ground wire lead to 2m on the wall surface.

(4) The Resistance tester measures the Earth net resistance to be less than or equal to 4 Ω, otherwise, add the pile or use the field character lattice to solve. The

(5) is used to 25mm2 the copper core wire and the ground net lead through the copper wire nose into the chamber. The

(6) is connected to the signal arrester ground and the electrostatic ground.

Scheme Two: Buried Purple copper plate

(1) in the vicinity of the machine room to dig 250cm*150cm*300cm deep pits, the pit bottom sprinkle some sodium chloride, buried in the Copper (1500mm*600mm*3mm). Pit deep to seeWater is quasi, but at least greater than 200cm. The

(2) welds the flat steel (30mm*3mm) and the purple copper solder together and leads to the ground as lead. The

(3) welds the galvanized flat and flat steel leads together, leading to the 2m of the wall surface. The

(4) Tester measures the Earth net resistance to be less than or equal to 4 ω. The

(5) is used to 25mm2 the copper core wire and the ground net lead through the copper wire nose into the chamber. The

(6) is connected to the signal arrester ground and the electrostatic ground.