Iec1312-1 lightning electromagnetic pulse protection standards, computer systems, electrical systems, lightning protection zone is divided into four regions, districts at the junction should be lightning processing. When metal wires (power lines, signal lines, etc.) through the different protection partition, because the role of electromagnetic induction to produce a higher over-voltage, affect the safety of the indoor equipment.

Therefore, the need to install the appropriate over-voltage protection, to protect the equipment. SPD level of the electrical system in the protection partition is different. At the same time, the need for a corresponding other potential processing.

Into the building the building of power lines and communication lines should lpz0 and lpz1 lpz1 and lpz2 District at the junction, and the front end of the terminal electrical systems, lightning protection equipment according to iec1312 - lightning electromagnetic pulse protection standards, the installation of the different categories of obo power class spd, and the communication network class spd. (spd transient over-voltage protection), spd is an effective means for the protection of electronic equipment subjected to the conduction of the lightning flashes and other interference caused by over-voltage surge.