A thermal expansion and contraction system secures cables to a ladder rung. The thermal expansion and contraction system includes a cable grip secured to the ladder rung. The cable grip includes a protective grommet for holding cables to the ladder rung, a metal plate and wire forms to secure the protective grommet to the metal plate. The thermal expansion and contraction system also includes a cable divider secured to the ladder rung to maintaining separation of cables and a cable containment clamp secured to the ladder rung.