In the photovoltaic system of the color steel tile roof, most of the solar cables are in direct contact with the color steel tile roof, especially in coastal areas with high humidity, where the working environment is very harsh. In addition, arcing on the DC side of the photovoltaic system sometimes occurs, and the solar cables that contact the roof will burn through the roof or even cause a fire when arcing. Pay attention to the following two points when installing solar cables:
First, when installing roof solar, you can consider installing additional insulating materials between the color steel tiles and the photovoltaic cables, such as bushings, insulating material trunking, etc., which can prevent most hidden dangers.
Second, install a DC arc detection device to shut down the system and troubleshoot in time when an arc occurs. At present, photovoltaic systems exceeding 80 volts in North America must be equipped with DC arcing detection devices, and IEC is also developing standards for DC arcing devices.
At present, there have been several cases of system fires in household PV, which burned the entire roof and caused heavy losses to farmers. The NEC2017 system specification in the United States clearly stipulates that the DC voltage of the system needs to be reduced to less than 80V in emergency situations to ensure Firefighters can quickly take fire-fighting measures to prevent the accident from expanding.
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