Here is an interesting concept for splicing a 120v wire run where a junction box would be unsightly in the final result.
Tyco Electronics Romex Splice Kit 2 Wire, 1/Clam-CPGI-1116377-2 - The Home Depot
Herb
Tyco Electronics Romex Splice Kit 2 Wire, 1/Clam-CPGI-1116377-2 - The Home Depot
Herb