@openstreetmap/id-tagging-schema/data/fields/voltage_electrified.json

The OpenStreetMap tagging model used by the iD editor

{
    "key": "voltage",
    "type": "combo",
    "label": "{voltage}",
    "prerequisiteTag": {
        "key": "electrified",
        "valueNot": "no"
    }
}