Insert Voltage Drop Schedule

The Voltage Drop Schedule command is used to calculate and display the voltage drop on the feeders and branch circuits in the project. See the Voltage Drop Calculation Method section for information on how voltage drop is calculated.

To insert the voltage drop schedule, go to

Ribbon: DM Electrical->Distribution Equipment-> dm_elec-insertVDSch Insert Voltage Drop Schedule

Pulldown Menu: DM Electrical->Distribution Equipment Schedules->Insert Voltage Drop Schedule

Voltage Drop Schedule Dialog Box


Schedule Notes: A note that will appear below the schedule when inserted on the drawing.

Maximum Schedule Height: Whether the schedule has a maximum height. This height corresponds to inches on the printed page.

If this is not checked, the schedule will be in a single schedule.

If this is checked, you can specify the maximum height of the schedule. When the schedule exceeds this height, it will be continued in a second schedule next to the first. The label of the second schedule will have the Schedule Title Continued Label option added to it to indicate that it is a continuation of the first schedule. See the Options->Schedules section for more information.

Specify on Drawing: Press this button to specify the Maximum Schedule Height on the drawing. The dialog box will be closed and you will be prompted to specify the height.

Specify maximum schedule height:

The distance that you enter on the drawing will be used as the maximum height. It is simplest to draw a line straight down to where the bottom of the schedule should be located.

Zoom to Schedule After Insertion: If this box is checked, the display will be moved to the schedule location after it has been inserted or updated. Check this box if you are having difficulty locating your schedule on a busy drawing.

Highlight Voltage Drops That Are Too High: Whether voltage drops that are too high are highlighted, and the threshold to be considered too high.

Yes, Feeder or Branch Circuit > 3%, Total > 5%: Feeder voltage drops that exceed 3%, branch circuit voltage drops that exceed 3%, and total voltage drops that exceed 5% will be highlighted. These values are based upon NEC 210.19(A)(1) FPN No. 4 and NEC 215.2(A)(3) FPN No. 2.
Yes, Feeder > 2%, Branch Circuit > 3%: Feeder voltage drops that exceed 2% and branch circuit voltage drops that exceed 3% will be highlighted.
No: Voltage drops that are too high will not be highlighted.

Circuits to Display: The branch circuit with the highest voltage drop will be shown for every distribution equipment. You also can choose to display additional branch circuit voltage drops.

None: No additional branch circuit voltage drops will be displayed.
All: All branch circuit voltage drops will be displayed.
All with load: All voltage drops for branch circuits with loads will be displayed.
All with voltage drop > 0: All branch circuit voltage drops that exceed 0 will be displayed.
Too high: Displays branch circuits where the branch circuit voltage drop exceeds 3% or the total voltage drop exceeds 5%.

Warn if Circuit Voltage Drop Cannot be Calculated: Whether you receive a warning if the branch circuit voltage drop cannot be calculated correctly due to circuiting errors.

If this is checked, an alert dialog box will be displayed alerting you to any errors and asking if you want to continue receiving this warning. Press the Yes button to keep the option checked the next time the Voltage Drop Schedule dialog box is opened. Press the No button to uncheck the option.

Edit Title, Column Labels, and Column Order: Press this button to modify the layout of the schedule on the drawing. See the Edit Voltage Drop Schedule List section for more information.

Inserting or Updating the Schedule on the Drawing

To insert or update the schedule, press the OK button.

Inserting the Schedule the First Time

If the voltage drop schedule is not currently inserted on the drawing, you will be prompted for the insertion location of the schedule.

Specify insertion point for voltage drop schedule:

The location you specify will be used as the top-left corner for the voltage drop schedule.

Updating the Schedule Already on the Drawing

If the voltage drop schedule is already inserted on the drawing, it will be updated in its current location.

It is necessary to update the schedule on the drawing when you make changes to the project schedule. The schedule will not update automatically.

The voltage drop schedule will also be updated when the Update All Schedules and One-Line Diagram command is run.

If you have manually inserted graphics, such as revision clouds, over the schedule graphic, always be certain to check their location after updating the schedule.


If there are errors in the one-line device definitions, an alert dialog box will be displayed alerting you to the errors. For more information on fixing these errors, see the Addressing One-Line Device Errors section.

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