I have two lights one on my house and one on my barn outside.There are two threeways that operate them.I need a recept. in the barn and the pipe to the barn is maxed out. How can I get the plug to stay hot.
You mean you're looking to run a receptacle off of a lighting circuit? Is that legal?
Mike, It's quite normal in North America to have a branch circuit feeding both receptacles and lights, although there are a few NEC requirements to limit this, e.g. the small appliance branch circuits in a kitchen.
There is a legal way to do it with 4 wires, plus the grounding conductor. Picture the receptacle in the garage. It takes two wires to energize it, the hot (1) and the neutral (2). Run them from the house. Picture two three-way switches, one at the garage and one in the house. Connect a hot jumper conductor to the top of each three-way. Connect one wire between the pivot-points (or commons) of the two switches (3). The last wire is the switched leg (4). Connect the switched leg to the bottom part of each three-way and to the lights at the garage and the house. Draw it out, it works, and it is legal. (Paralleling the hots with two #12s connected to a 20 amp breaker is legal.) What is not legal is the California hook-up where the ground is used as the return path (neutral), but the rest is the same.