Why do you need to investigate the existing loads when performing load calculations?

Investigating existing loads is crucial for ensuring that feeders can adequately handle the accumulated loads. Load calculations are essential to prevent overload situations that can lead to system failures, fires, or other safety hazards. By analyzing current load conditions, you can confirm that the infrastructure—such as the feeders and service panels—is rated appropriately for the existing demand. This assessment allows for any necessary upgrades or modifications to be made before further expansion or changes to the electrical system occur.

A focus on understanding how much current is already being drawn helps in achieving compliance with electrical codes and standards, which is important for safety and reliability. This knowledge also assists in planning for future load requirements, making cost-efficient decisions, and ensuring that older systems are not left inadequately supported.