When you start a Revit file you have the option to start from the electrical template. The UK library has some useful templates with many of the settings already filled in.

To get to the electrical settings, navigate via the Manage tab.

When you try to add a Correction Factor to a wire, you may find the capability disabled.

This is true for any of the wire types.

A clue presents itself when you try to select a temperature to add a correction factor for – it is empty.

Go back one step then, to the Wire Sizes dialog. Note that you can add a temperature to the Material. I add a temperature of 80°C to the specific wire. To explain why a wire may have different temperature rating, consider that the insulation can be different, and that this may alter the operating temperature.

To illustrate how the table works, I deleted the ampacity of 61A from the 80°C type. Notice the difference between 70°C and 80°C below, shown side-to-side.

Now that an additional temperature has been added, you are able to add temperature correction factors to the wire.

See below the complete table.

Unfortunately, you will have to add temperature correction factors to each separate operating temperature independently. As you can see the table was not duplicated for 80°C. Note, after you do add some values for the different temperatures, you can always duplicate the material. This does copy the temperature tables to the new material.

Lastly, note that after the new temperature is added, all the wire types expose their temperature correction tables (unlike before).

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