Variable 
Description 
Units 
Rcap 
Overall thermal resistance between conductor & ambient 
Thermal ohmft 
Rd 
Duct thermal resistance 
Thermal ohmft 
Rdc 
Conductor dc resistance at conductor specified or rated
temperature 
microhms/foot 
Reactance 
Conductor ac reactance used for voltage drop calcs 
ohms/1000 feet 
Resistance 
Conductor ac resistance used for voltage drop calcs 
ohms/1000 feet 
Ri 
Insulation thermal resistance 
Thermal ohmft 
Rj 
Cable Jacket thermal resistance 
Thermal ohmft 
Rsd 
Thermal resistance between cable exterior and duct interior 
Thermal ohmft 
Shield 
Cable shielded? Yes or No 

Shield 
Shield grounding, No shield, Shield w/1 end grd or Shield
w/2 end grd 

Shield Dia 
Shield mean diameter 
Inches 
Shield Rdc 
Shield dc resistance 
microhms/foot 
Shield Th 
Shield thickness 
Inches 
Shld X 
Mutual reactance conductor to shield 
Microhms/foot 
SIC 
Insulation Specific Inductive capacitance (SIC), SIC = SIC x
e^(SIC exp x Temp) 

SIC Exp 
Insulation SIC exponent, overall SIC = SIC x e^(SIC exp
Temp) 

Size 
Cable size designation 

Spacing 
Spacing between conductors in the same phase group 
Inches 
Specified Amps 
Specified conductor current 
Amperes 
Specified Temp 
Specified conductor temperature 
Deg C 
Sys Freq 
Applied power frequency in cable 
Hertz 
Sys kV 
Applied cable linetoline kilovolts 
kilovolts 
System 
Number of system (assigned in order entered) 

Temp 
Calculated or specified total conductor temperature 
Deg C 
Thermal Factor 
Factor specifying relative heating at each cable position 

Type of underground system 
Type of underground system, ductbank or direct buried 

Underground system filename 
Path and *.ugs filename where underground system data stored 

Voltage Mag 
Source or load voltage magnitude in load flow calcs 
Volts 
Voltage Deg 
Source or load voltage phase angle in load flow calcs 
Degrees 
Volt Drop (+%) or Rise (%) 
Voltage drop or rise across circuit length, = 100 x (VsourceVload)
/ Vsource 
% 
Watts/ft 
Total cable watts loss per foot 
Watts/foot 
Wd 
Cable dielectric loss 
Watts/foot 
x Coord 
Position x coordinate 
Inches 
y Coord 
Position y coordinate 
Inches 
Yc 
Increment of Rac/Rdc ratio due to conductor effects =
Ycs + Ycp 

Ycp 
Increment of Rac/Rdc ratio due to conductor proximity effect 

Ycs 
Increment of Rac/Rdc ratio due to conductor skin effect 

Yp 
Increment of Rac/Rdc ratio due to pipe or conduit losses 

Ys 
Increment of Rac/Rdc ratio due to total shield losses = Ysc
+ Yse 

Ysc 
Increment of Rac/Rdc ratio due to circulating currents in
shield 

Yse 
Increment of Rac/Rdc ratio due to eddy currents in the
shield 
