The new 2014 National Electrical Code (NEC 2014) contains a somewhat controversial new rule intended to protect firefighters who have to work on rooftops where solar photovoltaic (PV) systems are installed - Article 690.12, Rapid Shutdown of PV Systems on Buildings.
It requires a shutdown system with which emergency responders can de-energize the entire solar array within 10 seconds from a clearly-marked central switch before venturing onto a rooftop for firefighting.
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Amidst much media buzz about efficient new lighting technologies and a general uproar about government light bulb "bans" worldwide, the most fundamental rule for saving energy on lighting seems to be fading: Make only as much of the right kind of light as you need, and shine it only where you need it. That's the key to saving money on your lighting bill.