Electrician's Licensing Practice Exam

The correct answer, which states that a maximum of 50% of the load is included in the demand factor calculation for the portion above the initial 10KW, is based on established electrical codes and standards. When calculating demand factors, particularly in relation to larger electrical systems, the load served after the first 10KW is typically considered a smaller percentage of the total connected load.

This approach reflects the reality that as the load increases, the overall demand does not typically rise linearly; hence, high-load scenarios are capped at a certain percentage. The rationale behind setting 50% as the maximum for the load above the initial 10KW is to account for diversity and potential peak demand that may not materialize consistently.

This means that while it is essential to consider the entirety of the load connected to a system, the actual demand can often be lower in practical situations due to the way loads are utilized over time. Other percentages, such as 25%, 75%, or 100%, might not adequately represent the actual operational load conditions based on how systems are designed and used in commercial and residential settings. Thus, understanding this capped percentage helps electricians and engineers effectively size equipment and ensure compliance with safety standards.