HV Exit Exam • Set 1 Question 3 of 30

What safety document MUST be issued before performing maintenance on High Voltage switchgear?

✓

Direct Answer

Option C: High Voltage Permit to Work (PTW) and Sanction to Test

A formal High Voltage Permit to Work (PTW) and Sanction to Test are mandatory under international safety management codes. These documents ensure the system is isolated, locked, and verified safe by an authorized person, preventing accidental re-energization while personnel are exposed to hazardous live components during maintenance.

All Options

Verbal approval

Deck log entry

High Voltage Permit to Work (PTW) and Sanction to Test (Correct Answer)

Hot Work Permit only

Detailed Explanation & Context

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).

Practice Full HV Set 1

Test yourself with 30 interactive questions, live timer, and instant score.

Launch Practice Simulator →

Question Discussion & Notes

Have a doubt, memory trick, or exam update? Share your insights with fellow mariners.

Loading mariner discussions...

« Previous Question Next Question »

More Questions in HV Set 1

View All 30 →

Q1 What voltage level is defined as High Voltage (HV) under marine SOLAS and STCW regulations? Q2 What is the primary hazard of working on High Voltage marine equipment compared to Low Voltage? Q3 What safety document MUST be issued before performing maintenance on High Voltage switchgear? Q4 What mandatory step must be taken immediately after opening an HV circuit breaker and isolator? Q5 What medium is commonly used inside modern High Voltage marine circuit breakers for arc quenching? Q6 What safety equipment must be worn when racking in or out an HV circuit breaker truck? Q7 What is the purpose of earthing switches or portable earthing leads on isolated HV equipment? Q8 What key interlock system is used to enforce strict mechanical sequence during HV switching operations? Q9 What instrument is used to measure insulation resistance of High Voltage cables and machinery? Q10 Who is authorized to issue a High Voltage Permit to Work on a ship?