PV wire is a single-conductor, UV-resistant cable specifically engineered for photovoltaic array interconnection and direct burial applications. Recognized by UL 4703 certification, PV wire operates at temperatures up to 90°C and maintains flexibility in cold conditions down to -40°F. Typical sizes range from 14 AWG through 2 AWG, with ampacity ratings from 15 to 95 amps, selected based on array configuration and expected system current.
Technical Advantages
PV wire features a thicker insulation jacket than standard solar wire, providing enhanced durability against abrasion and puncture. Its single-conductor design simplifies routing through conduit and reduces installation labor compared to multi-conductor cables. The specialized insulation compound maintains flexibility and electrical properties across the full temperature operating range required in solar applications.
Installation Best Practices
PV wire requires proper support spacing, typically every 18 inches in vertical runs and 24 inches in horizontal runs. Direct burial installations must place wire 12 inches below grade, or 18 inches if protected by conduit or armor. Correct wire sizing ensures compliance with NEC Article 690 and prevents voltage losses that reduce system output and efficiency.