What type of cable must be used for the supplementary power supply in Mylos and Chiaras access control devices?

Carolina Bachenheimer-Schaefer
29.08.2017 13:07

For the supplementary power supply of the devices (10 - 32VDC/12 - 24VAC), a standard cable can be used; the sizing of this must be based on the total length of cable required for the installation. Specifically, ABB recommends a dedicated insulated cable for the power supply of the access control devices, of cross section 1 mm2. It is not possible to use the additional pair of conductors present in a KNX 4-wire cable (white-yellow), unless a power supply which meets SELV specifications can be guaranteed on this pair (in particular the presence of a power supply unit with isolation transformer). In general, seeing as it is not always possible to guarantee a SELV power supply beforehand or to know whether a power supply which meets SELV specifications has been supplied, it is in any case recommended to use a dedicated cable to power the access control devices, as indicated above.

Tags: Access Control, KNX, Power Supply
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