When should a hand-held portable phase...

When should a hand-held portable phase...

Question 1 of 270705eccefa3bacbc34ba4d47f91

When should a hand-held portable phase sequence indicator be used?

Question 1 of 27070

Q

When should a hand-held portable phase sequence indicator be used?

🔍 Key Concepts

• Phase sequence in three-phase AC systems (order in which the phases reach their peak voltage) • Importance of correct phase rotation for motors and large AC loads • Situations where incorrect phase sequence can cause motors to run backward or damage equipment

💭 Think About

• Which of these tasks involves connecting or confirming a three-phase AC supply where rotation/direction of motors or systems matters? • For each option, ask: would reversing the order of the three phases cause a serious operational issue (e.g., reverse rotation of motors, pumps, fans)? • Which job normally includes a step to verify phase rotation before closing a breaker or energizing the system?

✅ Before You Answer

• Identify which choices involve three-phase power connections rather than simple single-phase devices or passive components • Consider where motor direction of rotation or system rotation depends on correct phase sequence • Ask yourself: for which option would a standard procedure explicitly say "check phase rotation/sequence" before energizing?