Hi, frequency=* tag aims to qualify active elements on telecom or power networks (among others, see wiki http://wiki.openstreetmap.org/wiki/Key:frequency)
I see it as an optional property of power lines or cables. http://wiki.openstreetmap.org/wiki/Tag:power%3Dline In practice, a physical line/cable section isn't operated at, nor designed for, any dedicated frequency but it's all about the supported power circuit (a logical relation going from a place to another place through the grid). It always exists if line is actually powered on. We use to map such logical circuits with route=power relations where frequency is more relevant. Can we drop frequency on power lines and cables wiki page ? It can't be guess by looking at the line (instead of voltage) in landscape and there may be inconsistencies between circuits relations and lines members. If no further comments, i'll remove this option in 15 days for the above reason. All the best François
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