Depending on how far you need the circuit extension, and the size room the device is in, the NFPA 72 (FA Code) would allow you to take two cables (2 wires in each plus shield) and run to the new device. This would effectively give you the two there and the two back.
You have some limitations in this scheme if they are in the same raceway or bundle because there would need to be some separation if the area served was large.
