In a cupboard I have 5 wires in a length of black flexible conduit coming through the ceiling, the wires end in a connector strip (choc-bloc). Also, there's a cut-off coax cable coming through the same hole. The wires are coloured: White Grey Brown Blue Green / Yellow I assume that the Brown, Blue and Gr/Yel are for 240v although there is no voltage present. A multimeter shows 20.1 volts DC across the White and Grey cables. Any ideas what might have been connected?