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ME150/21/13 > Electrical Safety > Flashcards

Electrical Safety Flashcards

1
Q

Name 6 electrical hazards.

A
  1. Exposed wire.
  2. Working live.
  3. Exposure to hazard.
  4. Fire.
  5. Damaged earth wire.
  6. Exposed to water.
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2
Q

Define electrical shock.

A

The physiological reaction, sensation or injury caused by electric current passing through the human body.

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3
Q

When does electrical shock occur?

A

Occurs upon contact of a human body part with any source of electricity that causes a sufficient current through the skin, muscles or hair.

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4
Q

What are the 6 major types of incidents?

A
  1. Pre-occupation.
  2. Ignorance or lack of skill.
  3. Over familiarity.
  4. Tiredness/fatigue.
  5. Horseplay.
  6. Physical hazards.
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5
Q

How do we tackle the accident problem? (5)

A
  1. Know the hazard, know the precaution.
  2. Maintain safety discipline.
  3. Develop habit of noticing potential dangers.
  4. Learn first aid procedures.
  5. Be fully aware of all hazards.
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6
Q

Causes of electric shock. (8)

A
  1. Equipment failure (indirect contact)
  2. Human error (direct contact)
  3. A combination of both the above.
  4. Failure to observe proper safety precautions.
  5. Over familiarity.
  6. Shoddy work.
  7. Not reporting defective components.
  8. Failure to inspect/test portable equipment.
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7
Q

Draw the current - effect table.

A

Current Effect
1mA Involuntary reaction.
10mA Prevents releasing your hold.
20mA Physical damage.
30mA Can kill.

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8
Q

How much resistance does the human body have? (Wet + Damp)

A

Dry - roughly 100k ohms.

Damp - less than 1k ohms.

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9
Q

What voltage is (technically) considered safe in the rn?

A

24v DC.

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10
Q

How many volts and amps required to kill a human.

A

V - 30V.

A - 30mA.

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11
Q

What is LOTO?

A

LOTO (lock off/tag out) is a SSOW (safe system of work) used to lock off a system for maintenance and repairs.

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12
Q

Is LOTO the only safeguarding measure required?

A

LOTO is only a minimum and other safeguards can be employed such as a PTW (permit to work).

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13
Q

What are the reasons for isolating supplies from service by the LOTO system?

A
  1. Allows maintenance without hazard to maintainers.

2. Isolates equipment that is defective and be danger.

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14
Q

Name the 4 parts of the LOTO (Lock Off/Tag Out) system?

A
  1. Log-Off/Tag-Out index sheet.
  2. LOTO safety certificate.
  3. Lock-Off/Tag-Out label.
  4. LOTO- Display board.
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15
Q

What are the 3 MAIN causes of electrical shock?

A
  1. Equipment failure (indirect contact)
  2. Human error (direct contact)
  3. A combination of both the above.
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16
Q

What is the correct electric shock procedure? (8 marks)

A
  1. L.V.A.
  2. Isolate supply.
  3. If not able to isolate supply, remove person from supply safely.
    (Go on to explain DRSABC)
17
Q

Before carrying out a LOTO on equipment/system what 3 steps must be carried out?

A
  1. Obtain permission from senior rate to carry out isolations.
  2. All isolation points are to be identified.
  3. The equipment user is to be informed.
18
Q

Describe the procedure for removing fuses? (5 marks)

A
  1. Place finger in the centre of the fuse holder firmly
  2. With the free hand unscrew the fuse holder with a fuse key
  3. When unscrewed firmly grasp the fuse holder turn head away from fuse panel and
    remove the fuse holder smartly.
  4. Remove the fuse from the holder and replace the empty fuse holder to maintain a dead front.
  5. Repeat for second and third fuse way.
19
Q

Name the dangerous components and their associated hazards found on board HM Ships.

A
  1. Tantalum capacitor - subject to certain conditions they may explode, contains sulphuric acid.
  2. Selenium rectifier - toxic substances are released when they burn out during operation.
  3. Penetone TPC (not used in HM Submarines)
20
Q

What precautions are to be taken when using Penetone TPC?

A
  1. Flash point of 53* Celsius.
  2. Keep away from naked flames.
  3. Supply and exhaust fans to be running.
  4. Never to be sprayed onto live electrical equipment.
  5. Shelf life of 12 months.
  6. Always wear rubber gloves.
21
Q

What PPE should be worn while working in the galley?

A
  1. D.M.S. Boots.
  2. Overalls or 4’s with sleeves down.
  3. Chef’s hat.
22
Q

How are all galley supplies isolated in the event of a fire?

A

All supplies have isolation switch outside galley. They are all painted red.

23
Q

What is the biggest fire hazard within the galley?

A

Deep fat fryer due to high oil temp 180-190 Celsius.

24
Q

What are the precautions to be taken when working on live electrical equipment?

A
  1. Do not take unnecessary risks.
  2. Wear rubber gloves if possible.
  3. Use insulated tools.
  4. Take care not to cause short circuits.
  5. Wear insulating footwear.
  6. Be aware of voltages that are, or can be present.
  7. Do not rely on interlocks or other safety devices.
  8. Unless essential do not render interlocks or other safety devices inoperative.
  9. Do not work alone.
  10. Stand on rubber mats, avoid leaning on bulkheads.
  11. Work with one hand If possible.
  12. Check all test equipment is in date.
25
Q

What are the precautions to be taken when working on dead equipment?

A
  1. Isolate and carry out LOTO procedure.
  2. Discharge any capacitors in the circuit.
  3. Prove the equipment is dead using GPTME.
  4. Fit shorting straps to prevent capacitors from recharging.
26
Q

What is the correct procedure for removal of LOTO?

A

ME150/21/13 (3 decks)

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