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Correct “General Lighting Circuit” Settings

Monday, June 20th, 2016

This page describes the most common way to use the General Lighting Circuit settings in Design Master Electrical.


Go to the DM Electrical->Customization->Options->Edit Project List command.

Set the Distribution Equipment->Default general lighting circuit value to No.

Distribution Equipment

Go to the DM Electrical->Distribution Equipment->Panels command.

If you do not have any panels, use the command appropriate for the type of distribution equipment that exists in your project.

Press the Feeder and Service Calculation Settings button. Change the Default General Lighting Circuit Value to Default (No).

If you are calculating lighting based upon the area of the building, go to the Occupancy Areas section. Set the area based upon the power density. Use the NEC Table 220.42 Demand Area field.


Go to the DM Electrical->Circuiting and Homeruns->Circuiting command.

On the right is the General Lighting Circuit setting. It should initially be set to Default (No) for all circuits in the project.

Change it to Yes for circuits that have loads that are considered “General Lighting” by the NEC. See NEC 220.42, 220.52, and similar sections. Any load on a circuit that is set to Yes is ignored in the panel load total calculation. It is assumed to be included in the load calculated based upon the area of the building.

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