A barrier plate for supporting a cable within the internal channel of a ceiling mounted track having a pair of inwardly projecting parallel rails separated by a bottom slot. The barrier plate can be inserted completely into the internal channel and manipulated using a fingerhole through the plate to block downward movement of the cable through the slot. The plate can have radial disuniformities to frictionally bear against the pad of a user's finger to allow greater control of the plate orientation while engaged in the track channel.