What is the recommended maximum total voltage drop on both feeder and branch circuit conductors?

The recommended maximum total voltage drop for both feeder and branch circuit conductors is 5 percent. This guideline is important because it ensures that electrical systems operate efficiently and effectively. A voltage drop beyond this limit can result in equipment malfunctions, reduced performance, and even damage to electrical devices due to insufficient voltage being delivered.

The 5 percent threshold is considered a balance between maintaining adequate voltage levels to equipment and minimizing energy loss in the conductors. In practice, if the voltage drop exceeds this limit, it may indicate that the conductors are undersized for the load or that the circuits are too long for the amount of current being carried.

In contrast, the other options suggest higher percentages that would allow for more voltage drop, which could lead to problems in performance and reliability. By adhering to the 5 percent guideline, electrical installations can optimize performance and maintain safety standards as outlined in the National Electrical Code.