Load Calculations – Feeders and Services (26401) Practice Test 2026 - Free Load Calculations Practice Questions and Study Guide

In the context of calculating feeder circuit conductors, continuous loads must be treated as 125% of their actual load value. This requirement is outlined in the National Electrical Code (NEC), which specifies that any load expected to run for three hours or more continuously should be increased by 25%. This adjustment accounts for the additional heating and potential voltage drop that might occur under continuous use, ensuring that the conductors are adequately sized to handle these conditions without overheating or failing. By applying the 125% rule, designers ensure the electrical system operates safely and efficiently under sustained load conditions.

This treatment is important in feeder calculations, as it helps prevent undersizing wires that may lead to overheating and could pose safety hazards. Proper scaling of continuous loads ensures that electrical systems remain reliable and maintain performance standards over time.