Solar DC cables interconnect solar panels to the combiner boxes to inverter. The DC cables are usually two-core cables, a current-carrying live red wire and a negative blue wire, both are typically surrounded by an insulation layer. DC cables are generally made of copper conductors which provides more flexibility. As the life of the solar plant is expected to be more than 25 years, DC cables should be capable to withstand high temperatures, UV radiations, fire risk, expose to water etc.
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