Electrical engineers document a line set of conductors in schematics, specifying gauge, insulation, routing
http://historieblog.dk/index.php?title=How_Copper_Line_Sets_Improve_Refrigerant_Flow
Electrical engineers document a line set of conductors in schematics, specifying gauge, insulation, routing, and separation to meet ampacity, noise immunity, and EMC standards in complex assemblies.