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| Distributed hard wired panels – The central panel is identical to a hard wired panel described above. However extra junction boxes are supplied to be distributed around a building. Groups of dampers are then wired to the nearest junction box using a 4 core cable for each damper. A multicore cable is then run to connect each junction box to the central panel. The number of cores required is generally (2n + 2) where n is the number of dampers. This system is most suitable for 24v motors where a power supply is incorporated in each junction box to reduce voltage drop over long cable runs. |