Handling Voltage Drop and Transformers

There are three options for how to deal with transformers when calculating voltage drop.  You may Ignore Transformers, Reset Voltage Drop at Transformers, or Include Transformers in Voltage Drop.

To specify which option you would prefer to use, open the Design Master Electrical Options dialog box.

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Expand the Miscellaneous section of the Design Master Electrical Options dialog box.

Select the Voltage Drop and Transformers line, then select the option you prefer:

Here are a few more words explaining each of the three options.

Ignore Transformers for Voltage Drop Calculations

With this option selected, Design Master computes voltage drop including all conductors from the utility to the panel and/or branch circuit. It is assumed that nominal voltage is available at the terminals of the utility transformer.

Reset Voltage Drop at Transformers

With this option selected, Design Master computes the voltage drop including all conductors with nominal voltage assumed at the terminals of the nearest transformer, if a transformer is in the circuit.

Include Transformers in Voltage Drop Calculations

With this option selected, Design Master computes the voltage drop from the utility to the panels and branch circuits including all conductor voltage drop and the voltage drop through any transformers.  It is assumed that nominal voltage is available at the terminals of the utility transformer.

Once you have made your selection, press OK.

You may now continue to run your voltage drop calculations as you normally would. It may be necessary to reinsert the Voltage Drop Schedule to display correct voltage drop numbers after you change the calculation method. Follow the link above for more information.