The cable calculator software incorporates an swa cable calculator which also calculates the cable volt drop, expected Zs value and r1+r2.
Cable Calculator Software
Input your design parameters such as design current, length of circuit, supply voltage and Ze.
Then select from the built-in options for the circuit maximum volt drop % and earthing system type.
Earthing system options include:
RCD Max Zs in TT Earthing Systems Supported
As with most TT earthing systems it can be extremely difficult to achieve a low enough Ze reading to satisfy the maximum permitted Zs value of the circuit protective device, hence RCD's are required.
This cable calculation software includes support for TT earthing systems, the TT earthing system options supports using the RCD / RCBO maximum permitted Zs values instead of the MCB values, such as 1667 for a 30mA RCD enabling a more precise cable size calculation.
Cable Size Calculation Formula
SWA Cable Calculator
Cable Size Calculator Excel
This app has a lot of data programmed in to the app. Cable calculations based on Excel such as cable size calculator excel have to have accurate and current data setup by the means of multiple complex formulas, the formulas can easily be accidentally deleted or changed resulting in an incorrect cable size calculation. This app limits the mistakes that would result from using an un-trusted excel formula for cable calculations.
Volt Drop Calculator
A volt drop calculator is included within this cable calc app along with calculated Zs and calculated r1+r2.
Other Electrical Apps
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