What is the recommended maximum total voltage drop for feeders and branch circuits together?

The recommended maximum total voltage drop for feeders and branch circuits together is 5 percent. This value is important because it helps ensure that electrical systems operate efficiently and safely. Excessive voltage drop can lead to equipment malfunction, performance issues, and even safety hazards.

A total voltage drop of 5 percent combines the acceptable drop for both long feeder run lengths and branch circuits that supply lighting, outlets, and motors without significantly affecting performance. Specifically, this total is often broken down into a 3 percent maximum for branch circuits (which is critical for lighting and receptacles) and a 2 percent maximum for feeders. By adhering to the 5 percent guideline, electrical professionals can help maintain proper voltage levels at the point of use, which is crucial for the effective operation of electrical devices and appliances.

This standard is established based on considerations of power quality, energy efficiency, and overall system performance, emphasizing the need for careful planning and design in electrical installations.