Introduction When evaluating solar cable suppliers, price is the first number procurement teams look at. Certification often comes second — or not at all. That's a costly mistake. UL certification (specifically UL 4703 for photovoltaic wire) is not a formality. It is the difference between a cable that performs under real-world thermal, UV, and electrical stress — and one that looks identical on a datasheet but fails in the field. This guide breaks down the five most conseque