The Cable Chase is designed to provide a straight, clean path for wires with no obstructions. The brackets allow you to greatly reduce friction and stress on wires being pulled through the holes due to the hole design. Using the Cable Chase instead of drilling holes will greatly reduce the damage to floor joists, LVL’s and manufactured wood. It will also provide less opportunity for the wire to become damaged because of crookedly drilled holes, sharp wooden edges or wooden splinters. Maximum distance between each CC under floor joists is 16 in (when using under floor joists, the maximum distance, on one side from any wall, joist, pipe or ductwork is 12 in) Maximum distance between each CC along floor joists is 30 in Maximum distance between each CC above ceiling joists is 24 in Wire fill per hole - no more than (3) of 14-2, 14-3, 12-2, 12-3 romex, no more than (2) of 10-2, 10-3, 8-2, 6-2 romex. No more than (1) of 8-3, 6-3 romex and any SER up to #2, unlimited low voltage, data, phone, cable