Using Cablesizer is easy! First select the standard that you want to size to (e.g. NEC or IEC). Then fill in the input data on any of the main calculation screens (i.e. ampacity, voltage drop or short circuit temperature rise) and press the submit button to get your results. Once you have a set of results from any calculation, you can view the sizing report. The report will only show results from calculations that you have completed.
If you want to reset the input data and size a new cable, click on the new cable link that is accessible from the top-right menu.
For more information, see the tutorials in the help pages.
The reference installation methods are a set of common cable installation methods (coded from A to G) that are defined in IEC 60364-5-52 Annex A. Specifying a reference installation method is important because different methods correspond to different ampacities (or current carrying capacities). A description of the reference installation methods can be found here.
You must have cookies enabled in your browser in order to retain your selections across pages in the application, and also to view the sizing reports. Instructions for enabling cookies on your browser can be found here.
A cable wasn't found because the load current exceeds the derated cable ampacities available. This could be because the:
Alternatively, you could specify multiple parallel cables. Cablesizer doesn't yet support parallel cables, but you can manually do this by dividing the load current by 2 for two parallel cables, 3 for three parallel cables and so on.
You've selected a cable size that we don't have impedance values for. Please select cables within the following ranges:
If you've changed input values in the Basic Cable Information or Load Information forms, you must run all the calculations again (i.e. ampacity, voltage drop and short circuit temperature rise). The report will only output the results from the last calculation you performed on each calculation screen.
For example, if you decided to switch from copper to aluminium in the ampacity calculation, you must now run the voltage drop and short circuit temperature rise calculations again in order to get sensible results from the sizing report.