All- I've got two switches on the outside of the house (housed in outdoor-rated boxes mounted on the wall and fed by wall-mounted conduit)- one controls pool lights (2x500W), other controls a single overhead area light (500W). I want to convert them to 3-way with an additional two switches immediately on the inside of the house. So I'll replace the switches outside to 3-way, add in two 3-way switches in the wall on the inside of the house and wire them up. Question- does the wiring need to be inside conduit to make that 6-8 inch run through the wall? All the connections will be made inside boxes. Thanks!

My house was built in 1955 and we are approximately 3/4 way through a partial tear down rebuild. We have installed a new breaker box and the addition has all updated up to code wiring in it. My question is the electric wiring in the old part of the house. There is a hot wire that is coming out of the old part of the house with what appears to be brown fabric type stuff on it. It has two wires and no grounding wire. Is this the original wiring from the home? It appears to be brown cloth insulated wiring with two plastic insulated wires inside. If not where is the ground wire?