NEC - Short Circuit Tab

This tab displays details about source equipment, impedance and the calculated impedance values.

Cable Impedance details are displayed in the section shown below.

Note:
Values with an asterisk have been calculated using the Standards table data rather than Cables Catalogue data in AVEVA Electrical Wiring Manager. Therefore as a general rule asterisk values are less accurate.

In order to size cable under short circuit conditions, the following are provided.

Used to enter the limit for duration, from 1 to 5 seconds:

The initial temperature is equal to the conductor temperature from the cable rating table.

If the user specified that the cable temperature is to be calculated then it will be calculated using the appropriate NEC equation.

Final temperature is a calculated value.

Click on this button to perform the short circuit calculation:

The calculated core sizes are then displayed in the Results fields: