myElectrical - Cable Sizing Tool Upgrade 

By on

Our IEE cable sizing was wrote a few years ago and had become rough around the edges.  I thought it was time to give the tool a service.  Unfortunately when I looked under the hood I found cracked cylinders, broken bell ends and worn cylinders.  Rather than a quick service I had no choice be to do a major rewrite on the software.  The only thing I didn't touch is the chassis [database], which while suffering from patches of rust, was still usable.

In rewriting the software good things have happened.  There has been a large increase in performance [no more very long waits, with frequent postbacks] and I have put in a couple of enhancements.  The main things users will notice are:

 

  • things should be a lot quicker.  The number of postbacks has been minimized (unfortunately a few are required to retrieve cable configuration data).  Calculation of the cable size itself has been improved to make the processing more efficient.
  • everything is all on one page.  A slicker user interface with no more switching between tabs.
  • you now have quick access to the underlying data.  Click any of the  'i' buttons on the form and the relevant data table should pop up.

Of all the software tools on the site, the cable sizing one is the most complex.  A lot of the complexity derives from strictly following the Wiring Regulations, which while designed for humans to work through, are not necessarily software friendly.  Hopefully the tool should be working well, but if you do come across and bugs or have any suggestions, please let me know.

Click here to  give the Cable Sizing Tool a try.



Steven McFadyen's avatar Steven McFadyen

Steven has over twenty five years experience working on some of the largest construction projects. He has a deep technical understanding of electrical engineering and is keen to share this knowledge. About the author

myElectrical Engineering

comments powered by Disqus

  1. skalooba76's avatar skalooba76 says:
    12/7/2011 9:49 AM

    hi,

    i noticed when i try to size cable for small load, the software keep giving the wrong size, i.e for 12 Amp load, 380V, protected by 16 Amp, the cable calculation software will give 35mm2 which is wrong.

    please look into this matter

    thanks for all the help

    niki

    • Steven's avatar Steven says:
      12/7/2011 10:25 AM

      It may be the fault level. In calculating the size the following happens:

      Cable is calculated on current capacity
      Voltage drop is calculated (and cable size increased if necessary)
      Fault level withstand is calculated (and cable size increased if necessary)

      I have just tried your scenario (with XLPE cable) and at 25kA fault, 25m2 was required, but at 1kA fault only 1mm2.


Comments are closed for this post:
  • have a question or need help, please use our Questions Section
  • spotted an error or have additional info that you think should be in this post, feel free to Contact Us



Welcome back Bottle

‘Kept looking at a card, y’see? Kept looking at it. Welcome back Bottle. Gods below welcome home. The Crippled God A Tale of the Malazan Book of the...

Photovoltaic (PV) Panel - Performance Modelling

In an earlier note on the site [Photovoltaic (PV) - Electrical Calculations], the theory of solar (PV) cell calculations was introduced.  In particular...

Difference Between Live and Dead Tank Circuit Breakers

A quick post in connection with an email question: Live Tank - the circuit breaker the switching unit is located in an insulator bushing which is live...

How a Digital Substation Works

Traditionally substations have used circuit breakers, current transformers (CT), voltage transformers (VT) and protection relays all wired together using...

Getting Started with Patents

If you have a great idea or invent something the last thing you want is someone to steal the idea. One of the things you can do is protect the intellectual...

RLC Circuit, Resistor Power Loss - some Modelica experiments

Modelica is an open source (free) software language for modelling complex systems. Having never used it before, I thought I would download a development...

Skin Tapping Input

Tapping your forearm or hand with a finger could soon be the way you interact with gadgets. A new technology created by Microsoft and Carnegie Mellon ...

Fault Calculations - Introduction

Fault calculations are one of the most common types of calculation carried out during the design and analysis of electrical systems. These calculations...

3 Phase Loads

Three phase systems are derived from three separate windings, either connected in delta or star (wye). Each winding can be treated separately, leading...

myElectrical - Cable Sizing Tool Upgrade

Our IEE cable sizing was wrote a few years ago and had become rough around the edges. I thought it was time to give the tool a service. Unfortunately when...

Have some knowledge to share

If you have some expert knowledge or experience, why not consider sharing this with our community.  

By writing an electrical note, you will be educating our users and at the same time promoting your expertise within the engineering community.

To get started and understand our policy, you can read our How to Write an Electrical Note