Cable Sizing Setup
- Last UpdatedJul 25, 2025
- 2 minute read
The standard used in Engineering is selected using the Options window: AS, BS, IEC or NEC.
To specify the default values displayed in the Cable Sizing window:
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Select Setup > Cable Sizing Configuration from the Project tab. The Cable Sizing Configuration window is then displayed. For example:
Note:
The exact layout of the window will depend on the selected standard. -
Enter or select the default values.
Note:
For the IEC standard, the minimum value that may be saved in the Permitted Volt Drop and Starting Volt Drop fields is 0.05.
The maximum value permitted for the Permitted Volt Drop field is 20. The maximum value permitted for the Starting Volt Drop field is 30. -
The fields displayed in the lower section of the window change to depending on whether Free Air or Buried Underground is selected from the External Situation list.
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To view and (if required) add de-rating factors, access the De-Rating Factors tab:
The top section lists the de-rating factors from the selected cables sizing standard. These cannot be edited.
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The lower section is used to add, edit and delete project specific de-rating factors if required.
Click Add to create a new de-rating factor, and enter its description and value in the fields provided.
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To delete a de-rating factor, select it and click Delete.
Note:
Project specific de-rating factors should all be fully defined before any cable sizing calculations are preformed.
When a project specific de-rating factor is added or deleted, any cable calculations already carried out are made effectively incorrect. The following message will be displayed:
This does not happen if de-rating factors are edited. -
To specify which fields are to be included on the Cable Sizing Check Report, access the Cable Sizing Check Report tab:
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The tab lists the cable property fields. If a field is to be included in the report, make sure its Select checkbox is checked.
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Click Save to save any changes and exit the window.