IEC 402 Homework Questions and Answers Latest (2024 / 2025) (Verified Answers)

1. A voltage surge can be caused by . Select one: a. a lightning strike b. normal switching of high-power circuits c. either a or b d. neither a nor b: c. either a or b 2. A lightning arrester is a device that protects electrical equipment from . Select one: a. short circuits b. ground faults c. voltage surges d. all of these: c. voltage surges 3. In addition to protecting a motor from single-phasing, phase failure relays provide protection against . Select one: a. undervoltage b. voltage unbalance c. phase reversal d. all of these: d. all of these 4. Busway sections contain . These can be tapped for connection to utiliza- tion equipment. Select one: a. circuit breakers b. transformers c. busbars all of these: c. busbars