Abstract: In general, a wire retainer according to the present invention includes an exterior retaining wall having a first dimension adapted to be inserted through the aperture between the resilient fingers of the wiring duct, an interior retaining wall, a projection which extends normal to the interior retaining wall, and a duct engaging portion, disposed between a portion of the interior and exterior retaining walls, for securing the wire retainer at any selected vertical height between adjacent resilient fingers, having a first dimension substantially similar to the exterior retaining wall first dimension, and a second dimension larger than the duct engaging first dimension, whereby the second dimension interferingly engages adjacent resilient fingers after insertion and one-quarter turn rotation of the wire retainer.