Although the entire data loop is installed next to the power loop, or is installed very close to the building's steel structure or lightning rod, the ground potential of the AC power supply of the communication interface equipment connected to the data loop is seriously unbalanced, so the data communication interface is easily damaged.

The ways in which lightning can cause damage to electronic devices:

2. Through various coupling channels

2.1 Resistive coupling (earth potential retorting): There is a common impedance between the interference source and the working loop. The voltage generated by the interference source through this impedance is transmitted to the working loop.
2.2 Inductive coupling (electromagnetic induction): Inductive coupling, also known as electromagnetic coupling or electromagnetic induction, is generated by the interaction of magnetic fields between circuits. The main reason for this coupling is the mutual inductance between circuits.

2.3 Capacitive coupling (electrostatic induction): Capacitive coupling, also known as electrostatic coupling or electrostatic induction, is generated by the interaction of electric fields between circuits. The main reason for this coupling is the presence of distributed capacitance between circuits.
How to reduce or avoid the damage of lightning to electronic devices? We can divide the space where the protected equipment and systems are located from the outside to the inside into different lightning protection zones to facilitate the configuration of SPD and other lightning protection devices. According to the specific requirements of different zones, we can install corresponding levels of SPD on the line routing from one zone to another. As long as there are electrical and electronic devices, it is necessary to install SPDs to prevent lightning electromagnetic pulses.

The integration level of various information technology devices is increasing, buttheability to resist electromagnetic interference and attacks is actually deteriorating.The harm of lightning and artificial electromagnetic environment is becoming increasingly serious. More and more companies are beginning to pay attention to and apply lightning protection measures. The installation of SPDs plays an effective role in protecting information technology equipment from damage caused by lightning strikes.