What is the recommended practice before selecting the size of an overcurrent device?

Determining the load requirements is a critical step in the process of selecting the size of an overcurrent device. This practice ensures that the device can adequately protect the wiring and equipment from overloads and faults. By understanding the actual load demands, an individual can size the overcurrent device appropriately to handle not just the normal operating conditions but also potential overload scenarios without tripping unnecessarily.

When you accurately assess the load requirements, you take into account factors such as load types (resistive, inductive, etc.), continuous versus non-continuous loads, and possible future expansions. This comprehensive analysis helps ensure that the selected overcurrent protection can effectively prevent damaging conditions while still allowing for normal operation.

Considering load requirements first also aligns with electrical codes and practices, ensuring that the device is compliant and capable of operating safely within the specified electrical system. This foundational analysis is often the starting point before addressing installation specifics or consulting codes, as those elements rely on having a clear understanding of the load the system will support.