A:AnswerIt depends on the type of material used in the manufacture of the sheathing. If the sheathing is PVC most building codes prohibit its enclosure inside walls because it gives off chlorine gas in the event of a fire. There is no information given to determine the sheathing material.
A:AnswerA Cat-6 will carry power but does not act as a power source. As long as the devices that are connected with the cable support PoE (Power over Ethernet) and the devices supply power, then the cable will support the connection and will carry power.
A:AnswerYes, any Ethernet cord will work PoE, permitting it is connected to a PoE injector or compatible switch, etc. Cat 5e cables and beyond all support all PoE voltages - cat 5 typically supports lower PoE voltages only