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• Photovoltaic solar system rarely cause building fires directly, but the potential hazards they pose in the event of a building fire.
•  A solar system is a potentially dangerous, high voltage electrical generator. It should be inspected at least once in year to ensure that all system components are working correctly. It ensures ongoing operations and maintenance (O&M), including repair and replacement (R&R)
• It also Increase efficiency and energy delivery (kWh/kW)
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•       Arcing is less of not big issue in AC systems because AC arcs tend to self-extinguish as the voltage alternates, passing through 0 volts one hundred times per second for standard grid supplies.
• For an arc to be self-sustaining the conditions for starting the arc must be present continuously DC remains at a continuous voltage and once an arc has been established it will continue as long as the DC voltage is present.
  DC  Voltage and Current is a significantly higher fire risk than AC at the same voltage.
  1)    DC arc faults have been identified as the root cause of building fires that risk the safety of occupants and cause damage to property. DC arc faults also cause significant damage to solar equipment.
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• 2)    DC arc faults occur on the DC cabling under the solar array, anywhere along the DC cabling from the solar array on the roof to the string inverter and even inside the string inverter. 
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  3)     Switching off the inverter does not switch off the DC wiring.
  4)    The DC wiring from the solar array to the inverter is live whenever the sun is shining and there is no method to isolate this wiring. So switching off the inverter will not quench a DC arc fault. 
   
• 5)    Depending on the location of the fault, operating the roof top DC isolater may isolate the fault and extinguish the arc, however this will require accessing the roof and locating the appropriate DC isolator.
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  6)     Interrupting a DC arc fault with an isolator is not without its own dangers and would only be considered as a last resort.

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