DEHN offers surge protection proposal for KNX systems
DEHN has released a technical proposal detailing surge protection measures for KNX building automation systems. The recommendation focuses on protection at the building's entry point and within KNX distribution panels.
DEHN, a specialist in lightning and surge protection, has issued a technical proposal outlining recommended surge protection for KNX systems, a widely adopted standard in building automation.
The KNX standard, derived from the EIB European Installation Bus, is a global open standard for building automation. While operating on a protective low voltage (SELV) and featuring robust components, long cable runs and potential induction loops can expose the system to voltage surges, especially during lightning events.
DEHN's proposal highlights the critical need for surge protection at the building's main entry point where KNX bus lines enter the structure. This is particularly relevant for buildings equipped with external lightning protection systems. Additionally, the company recommends surge protection within KNX distribution panels and at key actuators, such as those integrated with heating control systems.
The technical document also addresses cabling practices, emphasizing the need to avoid induction loops and suggesting that bus and low-voltage cables be routed in close proximity to metal structures or pipelines. In specific scenarios, such as KNX cables run in protected, earthed conduits between buildings, certain lightning protection measures may be omitted.
DEHN offers solutions, including combination surge arresters, specifically designed to meet the demands of KNX installations. These devices are engineered to safeguard systems against various voltage transients originating from direct or indirect lightning strikes and power grid switching events.