Stations Wire Twisted. ESSEX GROUP, INC. Station Wire Twisted is designed for inside-outside runs from station protectors or building terminals to telephone terminal blocks. The jacket is made of a tough weather and flame resistant polyvinyl chloride (PVC) that provides protection when exposed to outside weather conditions and inside cleaning aids such as detergents, waxes, moisture, oil and most solvents. Generally 22 AWG copper color-coded polyethylene paired insulated wire with a single overall polyvinyl chloride jacket in beige or gray. Available in 2, 3 or 4 pair sizes. UL listed as CMX.