Introduction to Industrial Automation

6.10.5   Lightning  Protection

In the past few years, lightning protection was mainly confined to the protection of buildings. 

Today, this situation has changed since industry now uses automation equipment that contains 

a large number of microprocessors and generally integrated circuits for control and monitor pur-

poses. These units are much more sensitive to overvoltages than traditional relays and other con-

ventional automation devices. In these cases, overvoltages of a few volts above the nominal ones 

are enough to destroy the corresponding electronic components, and for this reason it is necessary 

that the automation installation is protected from lightning discharges.

1 Details of the shield connection terminal

2 Wiring of the shielded cable to analog I/O through terminal  

PS

CPU

2

2

1

Figure 6.47  Mechanism for the quick connection of a braided shield of a cable to the grounded