Precisely. In the US we usually run 208VAC at 30 Amps. In other countries where they run very high voltages with DC current ( more efficient but more dangerous ) a fault in the system could have sent high voltage down the communications line. Bad if you touch it and you are grounded.

Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


On 10/3/2013 12:40 PM, Roberto José Etcheverry Romero wrote:
May i ask what the good reason was? maybe dangerous voltages on some
comm equipment or one country's weird electrical code?

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