What is the voltage drop limit in branch circuits according to NEC?

The voltage drop limit in branch circuits according to the National Electrical Code (NEC) is designed to ensure efficient operation of electrical systems and minimize energy loss. The correct limit is that the voltage drop should not exceed 3% for branch circuits and 5% for feeders. This standard helps to ensure that electrical equipment operates correctly and efficiently, providing a reliable supply of electricity.

When the voltage drop exceeds these limits, devices may not operate as intended, leading to potential nuisance tripping, flickering lights, or reduced performance of electrical equipment. Keeping the voltage drop within these specified limits is crucial for safety and efficiency, as higher drops can lead to longer-term equipment failures and reduced lifespan due to overheating or under-voltage conditions.

The other options reflect either excessive limits or an absence of defined standards that do not align with the NEC guidelines, which explicitly address permissible voltage drops to maintain safe and efficient electrical installations.