Particle trapping elbow joint for enclosed high voltage electric bus apparatus

In an enclosed angular joint between a pair of linear high voltage electric bus conductors disposed with the longitudinal axis of at least one said conductor horizontal, each said conductor being mounted in coaxial radially spaced relation within a tubular sheath of conducting material adapted to be maintained at ground potential, an enlarged connector of generally spherical configuration forming a conductive joint between said linear conductors, a joint housing coupled to both said tubular sheaths and having walls radially spaced from said connector, the bottom wall of said housing including a particle trapping recess substantially centrally positioned in said bottom wall directly beneath said enlarged connector, substantially the entire area of said bottom wall being inclined downwardly toward said recess at an angle to the horizontal of the order of at least 2.degree. to 5.degree..