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Listing of Variables Utilized in AmpCalc, (Page 1 of 3)

Variable Description Units

# Cond

Number of conductors (not cables) at position

1/c OD

For 3/c Cable, outside diameter of 1/c portion

Inches

1/c Spacing

Equivalent phase spacing for 1/c cables at different positions

Inches

3/c Configuration

Type of 3/c cable, round or sector

Actual Fill %

Actual conduit fill

%

AL lay F

Lay factor for aluminum conductor

AL Res

Aluminum electrical resistivity

Cir mils ohms/ft

Allowable Fill %

Allowable conduit fill according to limits set by user or NEC defaults

%

Amps

Calculated or specified current on a per conductor basis

Amperes

Cable Lib

Cable data library descriptor

Cable OD

Cable overall outside diameter

Inches

Cable Size

Cable size designation

Cable Type

Cable type,1/c or 3/c

Concrete thermal resistivity (RHO)

Concrete thermal resistivity

Deg C-cm/watt

Cond.

Conductor Material, Copper or Aluminum

Conductor Diameter

Conductor diameter

Inches

Config

Cable configuration, non-applicable, equilateral, cradled or mixed

CU lay F

Lay factor for copper conductor

CU Res

Copper electrical resistivity

Cir mils ohms/ft

Current Mag

Magnitude of current used in load flow calculations

Amps

Current Deg

Phase angle of current used in load flow calculations

Degrees

Dissipation Factor

Insulation dissipation factor, (DF), overall DF = DF x e^(DF Exp x Temp)

Dissipation Factor Exponent

Insulation dissipation factor exponent, overall DF = DF x e^(DF Exp x Temp)

Distance from earth's surface to origin

Vertical distance from earth's surface to origin of coordinate system

Inches

Dist. top of ductbank to earth's surface

Vertical distance from top of ductbank concrete envelope to earth's surface

Inches

Dtd

Increment of conductor temperature rise due to dielectric losses

Deg C

Duct ID

Duct Inner diameter

Inches

Duct Library

Duct data library descriptor

Duct RHO

Duct material thermal resistivity

Deg C-cm/watt

Duct Thickness

Duct wall thickness

Inches

Duct Type

Whether duct material is Non-magnetic, Steel or Iron

Ductbank Geometric Factor

Calculated ductbank geometric factor

Ductbank Height

Height of ductbank concrete envelope

Inches

Ductbank Width

Width of ductbank concrete envelope

Inches

dx

Ficticious diameter at which the effect of loss factor commences

Inches

Earth temperature

Earth ambient temperature

Deg C

Earth thermal resistivity (RHO)

Earth thermal resistivity

Deg C-cm/watt

GF1

Geometric factor for 3/c cable applying to insulation resistance

GF2

Geometric factor for 3/c cable applying to dielectric loss

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