Interesting situation I've got to figure out. I have a commercial site where the controller is installed 30 feet below grade. The control wire (multi-strand) exits the building 3 feet below grade. The valve box that the control wire goes to is in an area that has some serious ground moisture issues. So...here is the problem... the ground water is getting into the control wire between the wires and the sheathing and wicking down into the controller in a small drip. Any one dealt with this before? Any ideas on solution? The only thing I have thought of so far is to smear caulking over the cable where we've cut the sheathing back for wire access and stop the water from entering the cable. I don't want to replace the cable itself because a) I don't want to have to deal with recoring and waterproofing the concrete wall and b) this isn't a fault in the cable per se, more a ground water issue.