Seagull Cbt 0393 Answers |link| -

| Question Topic | Correct Answer (Summary) | | :--- | :--- | | First step before HV isolation | Obtain switching permit & identify circuit | | Device that opens first in de-energizing | Circuit breaker | | Device that closes last when energizing | Earth switch (closed last when de-energizing, opened first when energizing) | | Insulation resistance for 440V | >1 MΩ (Megger test) | | Action for single earth fault on IT system | Locate and repair while system runs | | Rescue: victim in contact with live wire | Switch off supply FIRST | | Rescue: victim not breathing, has pulse | Rescue breaths only | | PPE for HV switchgear operation | Arc flash suit, HV gloves, face shield | | Meaning of "lock-out" | Physical padlock prevents operation | | Maximum touch voltage for AC | 50V AC (or 120V DC per some standards) |

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