1. Overview. With the rapid development of information technology, the network computer room has become a concentration of various important information systems and equipment. However, due to the large number of equipment in the computer room and the complexity of the wiring, lightning protection and grounding work is particularly important. A good lightning protection and grounding system can effectively protect the equipment in the computer room from lightning and ensure the stable operation of the information system. This article will focus on the lightning protection and grounding specifications of network computer rooms, in order to provide reference for relevant workers.
Second, the basic principles of lightning protection and grounding in the network room.
1.Comprehensive protection: comprehensive protection measures should be taken for lightning protection and grounding work, including external lightning protection, internal lightning protection and grounding system, etc., to improve the lightning protection effect.
2.Equipotential connection: All metal objects in the equipment room, such as equipment, pipes, and structures, are equipotential connected to reduce the potential difference caused by lightning current.
3.Grounding measures: Establish a reliable grounding system to introduce lightning currents into the ground to ensure equipment and personal safety.
3. Specific specifications for lightning protection and grounding.
1.External lightning protection system.
a.Lightning receiver: Install lightning rods, lightning belts and other lightning receivers to attract lightning and channel it underground. The flash receiver should be reliably connected to the down conductor and the installation position should comply with the relevant regulations.
b.Down lead: The diameter of not less than 8mm round steel or the cross-sectional area of not less than 48mm is used as the down lead, the number and position of which should be determined according to the distribution of the lightning receiver and the grounding device. The down conductor should be laid along the exterior wall of the building and connected to the grounding device.
c.Grounding device: The grounding device includes a grounding body and a grounding wire. The grounding body can be vertically buried in the ground with metal materials such as angle steel, round steel or steel pipe, and the grounding wire is connected with the down conductor. The grounding resistance should meet the requirements of the relevant regulations.
2.Internal lightning protection system.
a.Shielding measures: Shielding measures should be taken for the equipment and cables in the computer room to reduce the impact of electromagnetic induction. The equipment can be shielded with metal mesh, foil, shell and other materials, and the shielding mesh can be connected with the equipotential connecting belt.
b.Reasonable wiring: Reasonable wiring of the power and signal cables entering the computer room to avoid the formation of large induction loops. At the same time, lightning arresters should be installed for important cables, and grounding measures should be taken.
c.Equipotential connection: All metal objects in the computer room are equipotential connected to reduce the potential difference caused by lightning current. The equipotential connection belt should be made of copper material and ensure a reliable connection with all objects that need to be connected.
d.Lightning protection devices: Install lightning protection devices in the power supply system and signal system, such as lightning arresters, surge protectors, etc., to further reduce the damage of lightning strikes to equipment. The selection of devices should comply with the requirements of the relevant standards and should be regularly inspected and maintained.
3.Grounding system.
a.Grounding grid: Establish a reliable grounding grid, including vertical grounding and horizontal grounding body. The vertical ground body can be vertically buried in the ground with metal materials such as angle steel, round steel or steel pipe, and the horizontal grounding body can be tiled in the ground with flat steel or copper strip and other materials. The materials and specifications of the grounding grid shall meet the requirements of the relevant regulations.
b.Grounding resistance: The size of the grounding resistance is directly related to the quality of lightning protection. The grounding resistance value should meet the requirements of the relevant standards, generally not greater than 4. At the same time, the ground resistance value should be checked regularly to ensure that it is always within the acceptable range.
c.Shared Grounding System: For multiple buildings or floors sharing a common grounding system, the reliability of the equipotential connection should be ensured. The shared grounding system can adopt a one-point grounding method, that is, all the grounding wires of each building or floor are connected to the same grounding device to avoid the formation of potential differences.
Fourth, maintenance and management.
1.Regular inspection: Conduct regular inspection of the lightning protection and grounding system, including the lightning receiver, down conductor, grounding device and other parts to ensure that it is intact and effective. Problems found should be dealt with in a timely manner and recorded.
2.Maintenance: Carry out necessary maintenance work on the lightning protection and grounding system, such as cleaning dust, tightening screws, etc., to keep it in good working condition. At the same time, the lightning protection device should be regularly tested to ensure that it is working properly.
3.Personnel training: Training of personnel responsible for lightning protection and grounding systems to improve their professional knowledge and skill level. Staff should understand the basic principles of the system, how to operate it, and how to deal with common problems.