Safety device for a street lamp system

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.

Dependencies are inferred from the claim text.