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Listing of Variables Utilized in AmpCalc, (Page 2 of 3)

Variable Description Units

Grd OD

Overall outer diameter of ground cables at position

Inches

Grd Qty

Quantity of ground cables at position (needed only for conduit fill calculations)

Grd Size

Size of ground cables at position

Grd Type

Whether ground cables are Insulated or bare

Identifier

Cable position identifier assigned by user

Ins RHO

Thermal resistivity of insulation

Deg C-cm/watt

Insulation Thickness

Cable insulation thickness

Inches

Ipf

Insulation power factor, overall Ipf = Ipf x e^(Ipf Exp x Temp)

Ipf Exp

Insulation power factor exponent, overall Ipf = Ipf x e^(Ipf Exp x Temp)

Jac RHO

Cable jacket thermal resistivity

Deg C-cm/watt

Jacket Thickness

Cable jacket thickness

Inches

Jam Ratio

Ratio of duct ID to cable OD, to be OK for 3 cables must be < 2.8 or > 3.2

kcmil

Conductor area

Thou. circ mils

kp

Conductor proximity effect factor

ks

Conductor skin effect factor

kV

Rated cable line-to-line kilovolts

kilovolts

kVA

Circuit three phase load flow kilovoltamperes for all cables at position

kVA

kVAR

Circuit three phase load flow kilovars for all cables at position

kVAR

kVAR Loss

Total Circuit three phase kilovars losses for all cables at position

kVAR

kW

Circuit three phase load flow kilowatt for all cables at position

kW

kW Loss

Total Circuit three phase kilowatt losses for all cables at position

kW

Length

Circuit length, (one-way distance for dc as well as ac)

Feet

LF%

Load factor

%

Lib Volume

Cable Library data volume tag

LOG10(Fd)

Log (base 10) of distance product factor

Loss Fac

Loss factor

Neut OD

Overall outer diameter of neutral cables at position

Inches

Neut Qty

Quantity of neutral cables at position (needed only for conduit fill calculations)

Neut Size

Size of neutral cables at position

No.

Cable position number not including inactive positions

Nom. Size

Nominal duct size

Inches

Number of cable positions in system

Number of active cable positions in system calculation

PF %

Load Power Factor, (for voltage drop calcs)

%

Ph OD

Overall outer diameter of phase cables at position

Inches

Ph Qty

Quantity of phase cables at position

Ph Size

Size of phase cables at position

Qp

Loss ratio = Losses in (Conductor + Shield + Duct) / Conductor

Qs

Loss ratio = Losses in (Conductor + Shield) / Conductor

Qty-Type

Quantity and type (1/c or 3/c) of cables at position

Rac

Conductor ac resistance at conductor specified or rated temperature

microhms/foot

Rated kV

Cable line-to-line kilovolt rating

kilovolts

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