Naming what actually feeds the pump
On a rice mill east of Lamphun, the maintenance lead could name every pump by sound. He could not name the breaker that fed the smallest one, because the panel labels still used a contractor’s numbering from 2009.
Infrastructure dependency mapping starts with that gap. We walk to the panel, photograph the label, write the local nickname beside it, and draw an arrow from breaker to motor. The map is not a schematic for electricians; it is a shared sentence: this pump dies if that breaker is locked out.
Bring the person who resets trips on night shift. They will correct the day-shift story within ten minutes. That correction is the first useful line on the overlay sheet.
When two feeds share a trench, mark the trench as its own object. Flooding does not care which cable is newer. The map should show the trench as a parent, not hide it under two tidy lines.