One commonly used component in PV mounting systems is the C channel, also known as a C purlin. Designed for durability and precision, these brackets are engineered to withstand various environmental conditions, from extreme weather to long-term wear. Whether for. The Protea Bracket fits most trapezoidal sheet profiles, including pre-ssembled foam core panels (IMPs - Insulated Metal Panels). The bracket is set up with long and short legs before and after the bracket, and the legs are bolted to the foundation respectively, one end of the diagonal brace is supported at the foot of the long column. SteelPRO Group is a manufacturer of high-quality galvanized steel photovoltaic racking, providing reliable, durable and efficient photovoltaic support solutions tailored to your needs.