Michelin ECT Practice Exam 2026 – Complete Study Resource

Overload current is the extra current drawn when a load exceeds its normal operating level. Protection devices are designed to tolerate some overload for a period without tripping, so the typical magnitude of an overload is a modest multiple of the normal current. This range accounts for normal demand variations and starting surges (like motors) that are temporary but not faults. If the current were 10 to 20 times the normal, that would resemble a short-circuit situation, which protections clear much more quickly. If it were only 1 to 2 times, it wouldn’t capture the reality of brief but substantial overloads. Therefore, the common, practical range is about one to six times the normal current.