For a more advanced version of this App take a look at 'Ele Study: Network' at www.elestudy.com.au

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Calculations


  • Selected Cable
  • Cable: × mm²
  • Sc = mm²
  • Cable Current Capacity
  • Io = A, operating current
  • Icc = A, cable current capacity Table , Column
  • Nc = #, cables in parallel
  •  
  • Current Capacity (Parallel)
  • Icc,p = Icc × Nc
  • Icc,p = ×
  • Icc,p = A
  •  
  • Cable Derating
  • үB = , Table , Column
  • үS = , Table , Column
  • үT = , Table , Column
  • үR = , Table , Column
  • үB-d = , Table , Column
  • үB-s = , Table , Column
  • ү = , cable derating factor
  •  
  • Derated Current Capacity (Parallel)
  • IR = Icc,p × ү
  • IR = ×
  • IR = A
  •  
  • Operating Current Limit
  • Io ≤ IR =
  • Cable Operating Temperature
  • Io = A, cable operating current
  • IR = A, cable's derated current capacity
  • ϴR = ˚C, rated or maximum operating temperature
  • ϴA = ˚C, maximum ambient air or soil temperature
  •  
  • AS3008.1.1:2009, Section 4.4 page 89
  • (Io/IR)² = (ϴo - ϴA)/(ϴR - ϴA) ...4.4(1)
  • ϴo = (Io/IR)² × (ϴR - ϴA) + ϴA
  • ϴo = (/)² × ( - ) +
  • ϴo = ˚C, when carrying Io
  • Resistance per kilometer of cable
  • RT = Ω/km, resistance at ϴT Table , Column
  • ϴT = ˚C, temperature of RT
  •  
  • Resistance per kilometer, at operating temperature of cable
  • α = , temperature coefficient of resistance for
  • ϴo = ˚C, when carrying Io
  • Rot = RT[1 + α(ϴo - ϴT)]
  • Rot = [1 + ( - )]
  • Rot = Ω/km
  •  
  • Cable Resistance
  • Lc = m, cable length
  • Nc = #, cables in parallel
  • Rc = (Rot × Lc)/(Nc × 1000)
  • Rc = ( × )/( × 1000)
  • Rc =
  • Reactance per kilometer of cable
  • XT = Ω/km, reactance at ϴT Table , Column
  • Cable Reactance
  • Lc = m, cable length
  • Nc = #, cables in parallel
  • Xc = (XT × Lc)/(Nc × 1000)
  • Xc = ( × )/( × 1000)
  • Xc =
  • Voltage Drop Across Cable
  • Rc =
  • Xc =
  • Io = A, cable phase current
  • ϴo = ˚, phase angle
  •  
  • AS3008.1.1:2009 Section 4.5 page 89
  •  
  • Vd = Io × [Zvd]
  • Vd = Io × [Rvd + Xvd]
  • Vd = Io × [Rc × cos(ϴo) + Xc × sin(ϴo)]
  • Vd = × [ × cos() + × sin()]
  • Vd = × [ + ]
  • Vd = [ + ]
  • Vd = V, phase voltage drop
  •  
  • Percentage Voltage Drop
  • Vp = V
  • Vd% = Vd/Vp
  • Vd% = / × 100
  • Vd% = % V, percentage voltage drop
  •  
  • Voltage Drop Limit
  • Vd% ≤ VL% =
  •  
  • Cable Fault Withstand Assessment
  • Maximum temperature during fault
  • AS3008.1.1:2009, Section 5.4 page 114
  • I²t = , let through energy
  •  
  • Adiabatic Equation
  • I²t = K²S², 0.1 ≤ t ≤ 5 seconds
  •  
  • Initial temperature (Operating temperature)
  • ϴi = ϴo = ˚C
  • Final temperature (Insulation temperatre limit, Table 53)
  • ϴf = ϴr = ˚C
  • Metal =
  • β =
  • σc =
  • ρ20 =
  •  
  • Formula used to derive constant K in Table 52
  • Ko = √[(σc(β+20) × 10⁻¹²)/ρ20]
  • Ko = √[( × (+20) × 10⁻¹²)/]
  • Ko =
  •  
  • K = Ko × √[ln[(ϴf + β)/(ϴi + β)]]
  • K = × √[ln[( + )/( + )]]
  • K =
  •  
  • Cable: × mm²
  • Sc = mm²
  •  
  • Thermal Stress Limit
  • S²K² = ² × ²
  • S²K² =
  •  
  • Let Through Energy Limit
  • I²t ≤ K²S² =
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For a more advanced version of this App take a look at 'Ele Study: Network' at www.elestudy.com.au

Information


EleStudy is a free web application that performs calculations to AS3008.

Please share the link www.as3008.com with anyone that would find this site useful.

This site uses data from AS3008 and is reproduced with permission from SAI Global Ltd under Licence 1011‐c144

View Terms of Service View Links Back to Results

For a more advanced version of this App take a look at 'Ele Study: Network' at www.elestudy.com.au

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Terms Of Service


This application is provided as is and at own risk. All calculations should be independently verified. No responsibility is taken for any inaccurate results this application may produce.

Back to Information

For a more advanced version of this App take a look at 'Ele Study: Network' at www.elestudy.com.au

Load


A
W
V
Phase Rotation
Phase
Next: Cable Finish and View Results
  • Calculation Summary
  • AS3008 Tables
  • Icc = A, cable current capacity Table , Column
  • RT = Ω/km, resistance at ˚C Table , Column
  • XT = Ω/km, Table , Column
  • үB = , Table , Column
  • үS = , Table , Column
  • үT = , Table , Column
  • үR = , Table , Column
  • үB-d = , Table , Column
  • үB-s = , Table , Column
  •  
  • Results
  • IR = A, derated current capacity (parallel)
  • Vd% = % V, percentage voltage drop
  • S²K² = , thermal stress limit
  • Sc = × mm², selected cable

For a more advanced version of this App take a look at 'Ele Study: Network' at www.elestudy.com.au

Impedance


Metal
Core Structure
Core Type
Material Group
Configuration
Next: Rating Finish and View Results
  • Calculation Summary
  • AS3008 Tables
  • Icc = A, cable current capacity Table , Column
  • RT = Ω/km, resistance at ˚C Table , Column
  • XT = Ω/km, Table , Column
  • үB = , Table , Column
  • үS = , Table , Column
  • үT = , Table , Column
  • үR = , Table , Column
  • үB-d = , Table , Column
  • үB-s = , Table , Column
  •  
  • Results
  • IR = A, derated current capacity (parallel)
  • Vd% = % V, percentage voltage drop
  • S²K² = , thermal stress limit
  • Sc = × mm², selected cable

For a more advanced version of this App take a look at 'Ele Study: Network' at www.elestudy.com.au

Current Rating


˚C
Location
Arrangement
Arrangement of Cables
Next: Properties Finish and View Results
  • Calculation Summary
  • AS3008 Tables
  • Icc = A, cable current capacity Table , Column
  • RT = Ω/km, resistance at ˚C Table , Column
  • XT = Ω/km, Table , Column
  • үB = , Table , Column
  • үS = , Table , Column
  • үT = , Table , Column
  • үR = , Table , Column
  • үB-d = , Table , Column
  • үB-s = , Table , Column
  •  
  • Results
  • IR = A, derated current capacity (parallel)
  • Vd% = % V, percentage voltage drop
  • S²K² = , thermal stress limit
  • Sc = × mm², selected cable

For a more advanced version of this App take a look at 'Ele Study: Network' at www.elestudy.com.au

Voltage Drop


m
%

Fault


A

Protective Device


s
I²t
Fault Current Limiting
Next: Title Finish and View Results
  • Calculation Summary
  • AS3008 Tables
  • Icc = A, cable current capacity Table , Column
  • RT = Ω/km, resistance at ˚C Table , Column
  • XT = Ω/km, Table , Column
  • үB = , Table , Column
  • үS = , Table , Column
  • үT = , Table , Column
  • үR = , Table , Column
  • үB-d = , Table , Column
  • үB-s = , Table , Column
  •  
  • Results
  • IR = A, derated current capacity (parallel)
  • Vd% = % V, percentage voltage drop
  • S²K² = , thermal stress limit
  • Sc = × mm², selected cable

For a more advanced version of this App take a look at 'Ele Study: Network' at www.elestudy.com.au

Information



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