For secondary power mains, what is the usual limit for voltage drop?

The typical limit for voltage drop in secondary power mains is often considered to be 5%. This standard is established to ensure that the electrical systems operate efficiently while minimizing losses and maintaining the safety of electrical devices connected to that supply. A voltage drop exceeding this range can lead to inefficient operation of electrical equipment, potential damage, and increased energy costs due to lower voltage levels. Maintaining a voltage drop at or below 5% is therefore essential in design and installation practices to ensure reliable service and performance in electrical systems.