I think your problem has to do with the fact that the meshes of your cable objects consist of edges and vertices only. I believe for Physics to work between an object with Collision and an Cloth Object, the Cloth object needs to have faces. Otherwise it will not interact with Collision objects.
Also: Visible geometry created by a Skin modifier is in this regard cosmetic only. Even if an object with faces has an Skin modifier, the geometry created by the modifiers also does not interact with Collision objects.
Here is also an image to clarify:
Selected on this image is a cloth plane with zero thickness, that fell onto a larger collision plane, and then stopped moving. The thickness made by the Skin modifier clips trough the collision plane, and was not directly influenced by physics.
Under it is the same cloth object, but with all the faces removed (so vertices and edges only). If fell right though the collision plane.
Next to it is a similar cloth object but the mesh is a single vertex (it looks like a cube). It did not move or fall at all.
(On a related note: If a Cloth object has faces but still moves through a Collision object, it might help to move the Cloth object, or alter it, so its geometry won't clip (or stick through) the Collision object, since that can cause further clipping or other undesired physics results.)
