What is the typical voltage drop limit for branch circuits?

The typical voltage drop limit for branch circuits is often accepted as 3%. This percentage is widely recommended in the electrical industry to ensure that equipment operates efficiently and reliably. Excessive voltage drop can lead to poor performance, overheating, and can shorten the lifespan of electrical appliances. Keeping the voltage drop within this limit helps to maintain the proper functioning of devices and systems, ensuring safety and energy efficiency.

A 3% limit for branch circuits strikes a balance between practical installation considerations and the need for sustained performance across a wide range of loads and distances. This guideline helps to minimize energy loss while ensuring that the voltage at the point of use remains adequate for operation. In contrast, stricter limits, such as 1% for sensitive electronic equipment, are often specified, but the 3% is a more general rule applicable under typical circumstances for branch circuits.