What may be the locked rotor current be assumed to be for small motor compressors not having the locked rotor current marked on the nameplate?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards

From $25.99Unlock all

Prepare for the New York City Electrician Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

What may be the locked rotor current be assumed to be for small motor compressors not having the locked rotor current marked on the nameplate?

When a motor starts, there’s no back-emf yet, so current is governed mainly by the winding resistance, causing a large inrush—the locked-rotor current. For small motor compressors that don’t publish this value, a practical rule of thumb is to assume the locked-rotor current is about six times the rated running current. This sits in the common range for small induction motors (roughly 5–7x) and provides a safe basis for sizing fuses, breakers, and conductors when the exact value isn’t listed. The other multipliers are less typical for these motors, making six times the rated load current the best default estimate.

What may be the locked rotor current be assumed to be for small motor compressors not having the locked rotor current marked on the nameplate?

Prepare for the New York City Electrician Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

What may be the locked rotor current be assumed to be for small motor compressors not having the locked rotor current marked on the nameplate?

Get the latest from Passetra