A safety mechanism is provided for an electrical equipment rack. The rack has a frame with a vertical frame element including vertically spaced at intervals mounting points which are apertures for accepting mounting pegs of a frame mountable portion of an electrical equipment unit mounting rail. The safety mechanism has a vertical strip member mounted for vertical movement adjacent the vertical frame element, and the vertical strip member includes spaced apertures corresponding to the apertures on the vertical frame element. The vertical strip member is movable between a fully raised position and a lowered position. The safety mechanism further includes a raising mechanism for raising the vertical strip member from a lowered position to the fully raised position.