Quote:
Originally Posted by tlgerdes
North Sydney library found this out 15years ago, when a strike hit the parking lot 50 metres away and blew out the serial ports of 43 terminals.
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If light poles are powered by AC electric wires and every AC wire (in each cable) does not connect short to the building's single point earth ground where entering the buiding, then each overhead light pole is nothing more than a lightning rod connected to earth ground destructively via computers inside the building.
All computer ports already have significant protection. So that protection on each USB, ethernet, et al port is not overwhelmed, the surge must be earthed where that wire enters the building. If those overhead parking lot lights violated the single point grounding principle, then surges may find earth ground destructively via USB or ethernet ports - with or without surge protectors adjacent to those ports.