What is the maximum permissible voltage drop for feeders in a residential system?

The maximum permissible voltage drop for feeders in a residential system is typically set at 5%. This standard is based on the guidelines established by the National Electrical Code (NEC) and industry best practices. A voltage drop exceeding this limit can lead to a variety of issues, including inefficient operation of electrical equipment, potential overheating of conductors, and unnecessary energy consumption.

In residential applications, maintaining a voltage drop of 5% or less ensures that appliances and lighting operate within their specified voltage range, providing reliable performance and prolonging the lifespan of electrical devices. It also helps to reduce the risk of nuisance tripping of circuit breakers and voltage-related issues.

While some lower percentages, such as 2%, may be ideal for branch circuits supplying sensitive equipment, the 5% guideline for feeders strikes a balance between performance and practical implementation in most residential settings. Therefore, adhering to this tolerance is fundamental for effective electrical system design and maintaining safety standards.