A support assembly may be configured for connections with, adjustment along, and removal from a track assembly. The support assembly may include a support member and/or an electrical connector. The electrical connector may be adjustably connected to the support member and adjustable to a first position and a second position relative to the support member. The electrical connector may include a first contact configured to engage a first conductor of said track assembly. The first contact may be engageable with said first conductor when the electrical connector is in the first position. The electrical connector may be configured such that the first contact is disposed at a distance from said first conductor when the electrical connector is in the second position. The first contact may be movably connected to the electrical connector such that the first contact is movable relative to the electrical connector and the support member.