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ETICC > L safety > Flashcards

L safety Flashcards

1
Q

What are the major causes of accidents?

A 
Pre-occupation
Ignorance/lack of skill
Over familiarity
Laziness or fatigue
Physical hazards
Horseplay
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2
Q

How do we tackle the accident problem?

A

Know the hazard-know the precaution.
Maintain safety discipline.
Develop the habit of noticing potential dangers.

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3
Q

What are the 3 main causes of electric shock?

A 
Equipment failure(indirect contact)
Human failure(direct contact)
Combination of equipment failure and human error
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4
Q

What happens to the human body when exposed different to electrical currents?

A
  1. @ 1mA – Involuntary reaction
    1. @ 10mA – prevent you releasing your hold
    2. @ 20mA –physical damage
    3. @ 30mA –can kill
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5
Q

What voltage is considered to be safe onboard?

A

24 D.C.

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6
Q

What is the correct electric shock procedure?

A

Raise the alarm immediately
Isolate the supply by switching off supply or open breakers
(If supply cannot be isolated, stand on dry insulating material and push or pull with a rescue hook)
Once isolated, check for response.(If no response then finish DRABC)
Keep shouting for assistance until help arrives.
Carry out CPR until qualified help arrives.

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7
Q

Describe the procedure for removing fuses?

A

Ensure all services have been isolated
Confirm equipment is off/ stopped
1)Place a finger firmly in centre of fuse holder
2)With the free hand, unscrew fuse older using a fuse key
3)When fully unscrewed, firmly grasp the fuse holder, turn head away from the fuse box and remove fuse holder smartly.
4)Remove fuse from fuse holder and keep safe, replace empty fuse holder to maintain the dead front of the fuse panel.
5)Repeat for the second and third fuse way.

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8
Q

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

A

Tantalum capacitor- Stores electricity, can explode, might SPRAY SULPHURIC ACID when it explodes, face protection must be worn, found in AVR’S.
Selenium rectifiers- A rectifier is an electrical component that converts AC to DC, releases TOXIC DUST if they burn out during operation, care must be taken to ensure the dust is not inhaled or ingested.
Penetone TPC- Used to clean electrical components and can be VERY TOXIC, flash point of 53c.
Radioactive valves- found in minerva smoke detector heads

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9
Q

What precautions are to be taken when using Penetone TPC?

A

Keep away from naked flames.
Use fans if available.
Never spray directly on equipment.
Always wear rubber gloves.

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10
Q

What PPE should be worn whilst working in the galley?

A

D.M.S boots
Overalls or No4’s with sleeves rolled down
chefs hat

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11
Q

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

A

The galley electrical isolator- Located outside the galley, big red box.

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12
Q

What is the biggest fire hazard within the galley?

A

The deep fat fryer 180/190c

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13
Q

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

A
  • Do not take risks
  • Wear rubber gloves if practicable
  • Use insulated boots if practicable
  • Stand on insulating mats, don’t lean on bulkheads
  • Wear insulating boots
  • Be aware of voltages that are or can be present
  • Do not rely on interlocks or other safety devices
  • Unless essential do not render interlocks or safety devices inoperative
  • Don’t work alone
  • Take care that tools do not cause short circuits
  • Work with one hand
  • Check all items of portable equipment ha been tested and has been tested and has an in date test label
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14
Q

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

A
  • Isolate and carry out the correct lock off/ tag out procedure
  • Prove its dead by using an item of GPTME
    1) Carry out a voltage test between phases- Red to Yellow- Blue to red- Yellow to blue
    2) Carry out a voltage test between each phase and a known good earth.
    3) Discharge any capacitors in the circuit
    4) Fit shorting strips to prevent capacitors from recharging
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15
Q

What is the correct procedure for the RESTORATION of supplies?

A

1) Inform senior rate that work is complete and obtain permission to restore supply.
2) sign LOTO safety certificate for removal.
3) collect the fuses/keys along with part B and C of the label.
4) Obtain part A
5) Check you have correct fuse and check the circuit is dead
6) Return all label parts and safety certificate to the senior rate/ authorising person.
7) Safety certificate will completed- index sheet closed- labels destroyed

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16
Q

What specific PPE should you wear when working on tantalum capacitors?

A

Face protection

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17
Q

List the 3 types of hand change over switches.

A

Normal/alternative change over switch
Normal/emergency changeover switch
Normal/alternative/emergency changeover switch

18
Q

What should happen to the labels after reinstating a LOTO?

A

To be given back to the senior rate who then destroys them.

19
Q

What is the resistance of the human body, when dry?

A

Can be as low 1 kilo ohm, can be lower if skin is damp

20
Q

Why is it important to avert your eyes when removing fuses?

A

To prevent eye damage in the event of sparking

21
Q

Why is it important to avert your eyes when removing fuses?

A

To prevent eye damage in the event of sparking

22
Q

When carrying out a LOTO, where should “Part B” of the LOTO be placed?

A

Tag out board

23
Q

Why are shorting straps fitted to capacitors during maintenance?

A

To prevent the capacitors from recharging.

24
Q

When is it considered safe to work on live electrical equipment?

A

Only work on live equipment when there no alternative
Never work on HV
Only permitted when under supervision of a senior rate
1500vdc
1000vac

25
Q

The reasons for isolating supplies using the LOTO system

A
  • Allow maintenance to proceed without hazard to maintainers of equipment
  • Isolate equipment that is defective and its operation may be dangerous
  • Prevention of the selection of a mode of equipment operation which may be unavailable or dangerous
  • Where supplies have been provided but equipment has yet to be fitted
25
Q

The reasons for isolating supplies using the LOTO system

A
  • Allow maintenance to proceed without hazard to maintainers of equipment
  • Isolate equipment that is defective and its operation may be dangerous
  • Prevention of the selection of a mode of equipment operation which may be unavailable or dangerous
  • Where supplies have been provided but equipment has yet to be fitted
26
Q

Name the 2 parts of the Long Term LOTO Log

A

Long term loto index

long term loto safety certificate

27
Q

Radioactive Valves are broken down into Three categories. What are they?

A 
A-class one) Theta sign
B-class two) Trefoil symbol and words 'class two'
C-Hazard) Trefoil symbol and word 'caution' in black
28
Q

Work is NEVER carried out on Live Equipment with Voltages above what?

A

1000 V AC

1500 V DC

29
Q

State the procedure for REPLACING Fuses.

A
  • Ensure you have the right fuse, remove empty fuse from fuse way
  • Using approved test equipment, test for voltage across the empty fuse way is dead. This proves the equipment isolating switch/breaker is still open. If zero volts is indicated replace the fuse, repeat for 2 and 3.
  • Ensure you have correctly rated fuse
  • Avert eyes, locate the fuse carrier smartly onto the bus bars.
  • Tighten with fuse key whilst holding the fuse carrier firmly in place.
30
Q

How would You prove that a circuit is DEAD before working on it?

A

Isolate and carry out the correct tag out procedure
Prove that it is dead using GPTME and test equipment by testing between phases and phase and earth.
Discharge any capacitors using GPTME
If required fit shorting straps to prevent capacitors from recharging.

31
Q

What are the three items of Paperwork required for a LOTO Routine?

A

Safety certificate
LOTO label
Index sheet

32
Q

When you replace Fuses at the Fuse Panel. How do you prove Electrical Switches are open, or not?

A

Test for voltage across empty fuse way to ensure fuse way is dead. This proves equipment isolating switch is still open.

33
Q

List the five examples of HUMAN FAILURE that could lead to Electric Shock?

A 
Pre-occupation
Ignorance/ lack of skill
Over familiarity 
Laziness and fatigue
Horseplay
34
Q

What does HV stand for? and define its values?

A

High voltage- 1000 Volts AC- 1500 Volts DC

35
Q

List the seven Hazards that are associated with Arc Flash?

A 
Plasma
Light
Pressure wave
Shrapnel
Sound
Smoke
Heat
36
Q

What is a CP? And What is the definition of one?

A

A competent person- someone who has sufficient technical knowledge or experience.

37
Q

Definition of HV Live?

A

Informs personnel that the ship is either generating HV, is capable of generating HV or is connected to an external HV shore supply.

38
Q

Definition of HV Dead?

A

The ship is no longer capable of generating distributing or receiving HV. All sources of HV supply are disconnected and isolated with circuit main earths applied.

39
Q

Definition of HV Safe?

A

Informs personnel that a particular compartment is safe, all forms of HV power source disconnected and HV decay periods have elapsed. Must only be used in connection with the identified area.

40
Q

When is additional testing for DEAD carried out

A

Taking over from another personnel
When a break is taken
During inspections

ETICC (11 decks)

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