[gleenn]

My friend also always runs multiple string lines through during construction. Later if a wire breaks or you want an additional cable or upgrade, you attach your new wire to a string and pull the string from the other end all the way through. If they had done this, they could have simply dragged a new fiber optic cable through.

[aarmot]

You can pull the wire and second string together so you have always a single string in conduit.