40 FEET 12 Gauge 12 AWG UL Solar Panel Extension Cable Wire (40 ft.) with MC4 Connectors PV - 600VDC UL Listed 12 AWG Solar Panel Cable terminated with a MC4 Male Connector and MC4 Female Connector Photovoltaic module interconnection cable for use with or without a raceway in accordance with the Wiring Systems, Article 690 in the National Electric Code (NEC), NFPA 70. UL 4703 solar panel cable is designed for outdoor use and is moisture, UV and corrosion resistant. Solar panel cable is typically sold in 16, 14, 12 and 10 AWG sizes. The solar panel cable offered in this listing is 12 AWG which is the second largest diameter of the four. Using large diameter cable minimizes power loss in your solar panel system.