Secure Ignition Protection Categories
Only equipment protected against explosion is permitted in Ex areas. Ignition protection categories are constructive and electrical measures for equipment and qualify as secondary explosion protection.
An explosion occurs when oxygen (air), a flammable substance and an ignition source meet in a specific ratio to each other. Ignition protection categories counteract the origination of explosions; here, these categories designate measures with the goal of preventing ignition sources – for example, in production systems.