Safety device for a street lamp system
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United States of America Patent
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Oct 25, 2016
Grant Date -
Oct 29, 2015
app pub date -
Jun 30, 2015
filing date -
Mar 15, 2010
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A safety device for use in a street lamp, includes a first connection to a power grid (5), second connections to at least two external units (3,4), a first unit (3) of at least two units being adapted to draw current and a second unit (4) of at least two units being adapted to generate a potential difference. The safety device further includes a switch (6) adapted to switch between a first position, in which the first unit (3) is connected to the power line (5) to draw current from the power line, and a second position, in which the second unit (4) is connected to the power line to apply the potential difference to wires of the power line. The safety device further includes a communication system adapted to detect the presence of a safety signal on the power line and to switch the switch (6) to the first position in the event that the safety signal is missing or faulty.
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