What is the recommended maximum total voltage drop on both feeders and branch circuits to the farthest outlet?

The recommended maximum total voltage drop for both feeders and branch circuits to the farthest outlet is typically set at 5%. This standard is established to ensure that electrical systems operate efficiently and safely. A voltage drop greater than this can lead to a significant reduction in performance at the farthest outlet, which might manifest as dim lights, underpowered devices, or increased heat generation in wiring.

A 5% voltage drop is generally considered a balance between allowing enough voltage to reach the endpoint devices while minimizing unnecessary energy loss and ensuring that the system is reliable and compliant with electrical codes. This figure is commonly used in both residential and commercial electrical installations, providing a guideline that helps in designing circuits effectively.

If the voltage drop exceeds this recommendation, it can lead to issues such as reduced efficiency, increased risk of equipment malfunction, and potentially hazardous conditions due to overheating or overloading of the circuit. Thus, adhering to this guideline promotes safety, efficiency, and longevity in electrical installations.