Duct cable is a conduit system and must be treated as such. If the system is damaged the duct may be spliced, however, the electrical conductors in the duct cannot be spliced inside the duct. Depending on the length of the duct run, maintenance personnel may want to remove the existing wire and pull new conductors or consider placing a ground box and splicing the conductors.

If the conductors are spliced, splicing procedures in the Electrical Details standards should be used to make the splice. Heat shrink tubing or gel caps are the only recommended splice insulators. Where two or more conductors enter one heat shrink tube, wrap the conductors with heat shrink tape. Heat shrink tubing must then be applied to insulate the splice. It is important to note that when duct cable is severed to make a splice, the ends of the duct must be cut straight and neat. Ends must also be reamed to remove sharp edges.