[time-nuts] GPS shielding by power lines?

[Arnold Tibus]

On Sun, 10 Aug 2008 10:27:31 +0100, Alan Melia wrote:

>.... I note there lines have three "phase" feeds but no
>neutral wire so they must use ground as the return path to any unbalance
>currents.(?)

As long as the system is kept balanced a 3 phase energy transport 
system does not need a 4th wire as the sum of all the currents in the 3 wires 
(phase shift 120deg between the wires) is zero! 
regards
Arnold, DK2WT