250' 18/5 Blk Sprinkler Cable 18/5 solid underground sprinkler system wire. 30 volts RMS max. Used for sprinkler control systems. Soft annealed solid copper per ASTM B3-90. Polyethylene insulation and jacket. 18 AWG bare copper. Cable consists of 5 bare copper insulated conductors wit h an overall outer jacket diameter of 0.246; UL listed.