In Single-Phase Motor Installations, the Branch-Circuit Protection Is Based on NEC

question 12

Essay

In single-phase motor installations, the branch-circuit protection is based on NEC Table 430.52 as a percentage of full-load current. (Note: Full-load current referred to here is the Code book value.) The full-load current is listed in Table 430.248 for single-phase motors. If using a typical inverse time breaker, the percentage for single-phase motors is 250% of the Code book value for the size of the motor at the connected voltage.
Briefly explain why this high percentage is allowed.

---

Definitions:

Premise

A foundational assertion or premise leading to further deductions or outcomes as logical conclusions.

Enthymeme

A logical argument in which one premise is not explicitly stated.

Premise

A statement in an argument that is believed to be true and from which a conclusion is drawn.

Venn Diagram

A diagram using overlapping circles to visually represent the relationships among sets, illustrating both commonalities and differences.