Abstract: A joint elbow assembly for wiring comprises a pipe elbow, two annular nuts, and a plurality of roller assemblies. The pipe elbow comprises a lower housing and a detachable upper housing. A plurality of flanges are formed on the outer periphery of the lower housing. A bracket is formed on the inner surface of the flange and two female lugs are formed on the two protruding ends of the bracket respectively. Each roller assembly which comprises two sleeves, a plurality of needle bearings and a central roller is inserted into the two female lugs. An adhesive is applied to the upper edges of the lower housing and the lower edges of the detachable upper housing.