Any idea if there is any way I can supply a honeywell orbiter gold dome camera using 1 cat5 cable. The trouble is the cable is already installed and is behing plaster and has been decorated.

The camera requires 24VAC and uses around 3 Amps.

Could i get away with using 3 of the pairs to supply power and the other pair for video and up the coax telemetry.

The distance between dome and PSU is about 15m, but i could move the psu nearer if necessary, probably about 5m.