The L-coupling (protective conductor is located on the outside) is one of many components in the DUOline rail system and connects two rails at an angle of 90 degrees. The 2-phase system is extremely flexible and offers many possibilities for individual lighting design. With DUOline 2-phase rails, the protective conductor is located on one side of the rail profile. The position of the protective conductor (right or left) is determined by the installation of the respective connection unit and must continue continuously through the system. The system is available in three different color variants, here m-black.