Voltage drop is a critical but frequently underestimated factor in the performance and safety of low-voltage electrical systems. This paper investigates the systemic impact of undersized conductors, focusing on their contribution to excessive voltage drops under normal operating conditions. Drawing from field observations and simplified calculations, the study shows that installations using 1.0 mm² or 1.5 mm² cables over extended distances often exceed regulatory voltage drop limits, leading to thermal buildup, equipment malfunction, and gradual system degradation. The analysis reveals that these conditions are often overlooked due to cost-cutting, inadequate technical training, and a lack of post-installation testing. The findings emphasize the need for improved design practices, routine under-load voltage measurements, and stricter inspection protocols. By addressing this overlooked issue, significant improvements can be made in energy efficiency, system longevity, and end-user satisfaction, particularly in residential, institutional, and rural electrification projects.