Pre-fabricated junctions (Ø.187"") have a grid pattern of 2 inches x 4 inches and are available in standard widths of 6, 8, 12, 18 and 24 inches with a depth/height of 2, 4 or 6 inches. Junctions/intersections lengths are standard: 12 inches wide or less come 2 feet in length and junctions/intersections more than 12 inches wide come 3 feet in length. All drops are available in 12, 18 or 24 inches in length. See finish chart for colors; safety yellow is the standard. Custom colors are available. Junctions/intersections include interconnecting hardware. CM20 meets UL requirements as a ground conductor.