Case studies(Introduction examples)

Lightning protection for access control

If there is a device on each floor, there may be a difference in electric potential on each level.

Access control systems that can strictly regulate access to rooms and record and control "when," "who," and "where" people enter and leave are used in a variety of facilities. In addition, when an entire building is managed by a single system, electrical potential differences occur on each floor, and especially when multiple buildings are managed by a single system, the signal lines tend to be long, making them susceptible to lightning surges.

Dangers if no measures are taken
  • Damage, malfunction, or failure of electric locks
  • Loss of access record information

Lightning protection points for access control

Countermeasure points
Install an SPD for each wiring of the control panel. For card readers and electric locks, select SPDs according to their specifications (in the figure, SPDs for high-current signal lines and SPDs for control power circuits are shown). If the control panel is in a separate building, or if the distance between the control panel and the card reader, etc. is large, install SPDs in the vicinity of the card reader, etc. If the control panel is connected to the central monitoring PC via LAN, use an isolated lightning protector for the LAN to provide lightning protection for the LAN as well. Use SPD for power supply for the control panel and central monitoring PC.

Installation example

Lightning protection products for access control