What is the maximum permissible voltage drop in a residential circuit?

The maximum permissible voltage drop in a residential circuit is important to ensure that electrical systems operate efficiently and safely. The National Electrical Code (NEC) generally recommends a maximum voltage drop of 3% for branch circuits and 5% for feeders. This range helps to maintain proper voltage levels at outlets, which is crucial for the operation of electrical devices.

When the voltage drop exceeds these levels, it can lead to problems such as dimming lights, reduced performance of appliances, and, in some cases, overheating due to increased current draw. Choosing values that are too low, such as 1% for branch circuits, would not reflect standard industry practices and could result in unnecessary complications in residential wiring design. Overall, the specified percentages in the correct answer maintain a balance between system performance, efficiency, and practicality in residential electrical installations.