While photovoltaic systems have numerous benefits for energy generation, they have always presented a unique challenge for first responders, because the systems cannot be turned off quickly or easily.
Jeffrey Sargent, NFPA regional electrical code specialist, writes in his column in the January/February issue of NFPA Journal about a new requirement in the 2014 National Electrical Code® that will help solve this problem.
The 2014 NEC requires “rapid shutdown,” a device that can quickly reduce the power output of a PV system.
“Within 10 seconds of activation, the rapid-shutdown system reduces the voltage level to not more than 30 volts, and the overall power in the system to not greater than 240 volt-amperes, levels that mitigate shock and electrical burn hazards,” Sargent writes.
To learn more about this requirement, read the latest issue of NFPA Journal.
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