ESCO Electrical Theory and Application Practice Test 2025 – Complete Exam Prep

The maximum allowable supply voltage variation is commonly recognized as 5%. This standard is based on ensuring that electrical equipment operates efficiently and safely within its designated parameters. A voltage variation of this magnitude allows for practical fluctuations seen in power systems due to load changes and other factors without risking damage to equipment or a decrease in performance.

Operating within a 5% range helps maintain the operational integrity of sensitive devices, ensuring that they receive sufficient voltage for normal functioning while also protecting against potential over-voltage or under-voltage conditions. This value is also consistent with various electrical codes and standards, which aim to provide guidelines for the safe operation of electrical systems.

Understanding this concept is vital for professionals in the electrical field, as it influences decisions about equipment selection, power quality monitoring, and system design.