Hi all, Currently, power transformers' voltages are given by voltage=high;low or voltage-high=* / voltage-low=* keys.
Recently I found a case for which all these aren't suitable. http://www.openstreetmap.org/node/2387971998 Transmission transformers often have tertiary interfaces to feed ventilation systems or substation's auxiliary power supplies. I've used voltage:primary, voltage:secondary and so on to bring single-valued keys instead of semicolon separated ones as a test. They are more extensive than voltage-high, voltage-low which don't explicitly target transformer's interfaces. How do you feel about these points ? All the best François
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