What does the amperage of tap conductors have to meet according to the 10' Tap Rule?

The requirement for tap conductors to exceed the load served is rooted in ensuring safety and efficiency in electrical installations. The 10’ Tap Rule, which pertains to the sizing of conductors in relation to the devices or loads they serve, is designed to provide a margin of safety that accounts for potential overloads.

When tap conductors exceed the load they are serving, it helps prevent overheating and minimizes the risk of conductor failure. This practice is crucial because conductors can heat up due to current flow, and if they are not adequately sized, they could lead to insulation breakdown, increased resistance, and reduced lifespan of the electrical system.

By requiring that the amperage of the tap conductors exceeds the load served rather than being less than or only matching it, the electrical system is more robust and resilient, ultimately promoting safer and more reliable operation.