What is the maximum allowable voltage drop for feeder and branch circuits?

The maximum allowable voltage drop for feeder and branch circuits is defined to ensure efficient operation of electrical systems while minimizing energy losses. According to the National Electrical Code (NEC), it is generally accepted that a maximum voltage drop of 3% is advisable for feeders and 5% for branch circuits. This guideline helps maintain the performance of electrical devices, reduces the risk of interference, and ensures safety by preventing overheating in conductors due to excessive drop.

This standard is rooted in the understanding that excessive voltage drop can lead to subpar performance of devices, inefficient operation, and potential damage, meaning the selected answer effectively balances efficiency and equipment safety. By adhering to these standards, systems can maintain reliable functionality even as load conditions fluctuate. This knowledge is essential for electrical professionals to ensure compliance with NEC guidelines and to provide safe and effective installations.