Insert Voltage Drop Schedule

Design Master calculates the voltage drop for every panel, one line device, and branch circuit. All these calculations can be displayed on the drawing via the voltage drop schedule.

You will be prompted to Draw Voltage Drop Schedule, by which Design Master is asking for you to indicate, via a click, where on the drawing you wish the top left-hand corner of the schedule to be placed.

Field	Displays
Location	This field displays the one line device for which the voltage drop is being calculated.
Feeder 1	This field displays the voltage drop through the feeders leading to the one line device.
Feeder 2	This field displays the voltage drop through the feeders leading to the one line device from a second power source, when applicable. For example, if a panel has a feeder from the Utility and from a generator.
Max Branch Circuit	This is the branch circuit with the worst voltage drop on a particular one line device. If this is in compliance with the NEC code, then every other circuit on the one line device is within compliance as well.
Total	This is the total voltage drop for the worst-case branch circuit on each one line device. It is the sum of the feeder voltage drop and the branch circuit voltage drop.

Voltage drop numbers will be highlighted in yellow if the feeder voltage drop is greater than 3%, if the branch is greater than 3%, or if the total voltage drop is greater than 5%. See NEC Section 210.19 (A) FPN 4 for branch circuit criteria and NEC Section 215.2 (A) (4) FPN 2 for feeder criteria.

In order for a branch circuit to be calculated, the homerun must be drawn on the floor plan, as the homerun is the mechanism through which Design Master is told how to calculate the distance between the branch circuit and the one line device.

If there are errors in the calculation process, Design Master will alert you at the command line and list the possible problems. The software will also suggest how to fix the errors.

Any time you need to update the voltage drop schedule, re-insert it the same way you originally placed it on the drawing. While Design Master automatically recalculates the voltage drop, it does not update the numbers in the voltage drop schedule unless you re-insert it.