UL Standards free download UL 6703-2021 pdf download – Connectors for Use in Photovoltaic Systems UL 6703-2021 pdf download - Connectors for Use in Photovoltaic Systems. 6 Polymeric Materials 6.1 General 6.1.1 Polymeric materials may be used as an enclosure or as insulating materials that are in direct contact with or in... 02-09 Download Now