Page 113 - Basic Course
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KNX BASIC COURSE
18 Recommendations to the use of overvoltage arresters
The use of overvoltage arresters is recommended for:
bus devices with protection class 1
bus devices with more connections than just bus (230/400 V AC and/or pipes of the
heating system)
In distribution boards, it is sufficient to equip each bus line with one overvoltage arrester.
In this case also the outer conductor and the neutral conductor need to be equipped with
overvoltage arresters.
For luminaries with built-in switching actuators the installation of overvoltage arresters is
only necessary when the bus and the mains form large-surface loops.
Home and Building Management Systems KNX Association
KNX TP Installation Installation_E1213c 23/28
