Installation of cables for electrical calculations

Symbol
$inst_{elec}$
Choices
IdInstallationInfo
11 cable1 single-core cable (single-phase system) / 1 multi-core cable
22 cables2 single-core cables (two-phase system), DC or railway system
33 cables flat3 single-core cables (three-phase system), flat vertical or horizontal
43 cables trefoil3 single-core cables (three-phase system), trefoil (equilateral triangle)
53 cables rectangular3 single-core cables (three-phase system), rectangular (right isosceles triangle)