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Re: Why Did California Build Such Tall Bridges Over Its High-Speed Train Tracks?
Author: Dr Zarkoff
Date: 03-04-2019 - 12:58
To clarify things a little: the GOs (95 and 176) essentially lump contact wires and feeders into the same category, which means they're subject to the same clearance requirements. A "feeder" is the single phase supply to the trolley wire. Any three-phase high voltage lines running along the track to supply the phase-converting substations are "transmission lines" and are subject to a different set of rules. The media has thoroughly muddled things as usual.
That 26' pantograph safety zone in GO 176 extends 6'7" either side of the centerline of the track. It's intended to prevent a broken but still energized pantograph from flying around above the contact wire and striking the undersides of things crossing over the track and energizing them. Broken wire considerations are the same: the zone provides enough free space so a breaking wire, span wire, etc. can't recoil far enough to brush up against the overpasses and do the same thing.
That 26' pantograph safety zone in GO 176 extends 6'7" either side of the centerline of the track. It's intended to prevent a broken but still energized pantograph from flying around above the contact wire and striking the undersides of things crossing over the track and energizing them. Broken wire considerations are the same: the zone provides enough free space so a breaking wire, span wire, etc. can't recoil far enough to brush up against the overpasses and do the same thing.
