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L Safety > L safety > Flashcards

L safety Flashcards

1
Q

What is the procedure for electric shock?

A

1) LVA
2) Isolate supply if possible
3) If 2 is unavailable then use a safety hook to move the causality
4) Check for response
5) Check Airways are open
6) Check the causality is breathing
7) Call for help (HQ1)
8) Start CPR

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2
Q

Define Electric shock

A

Electric shock is where an external current is passed through the body

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3
Q

3 causes of electric shock

A 
Equipment Failure (non-direct contact)
Human Error (direct contact)
Combination
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4
Q

Another way of describing equipment failure

A

Non direct contact

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5
Q

What cause of accident is direct contact?

A

Human error

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6
Q

At what value of current would you have an INVOLENTARY REACTION

A

1mA

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7
Q

What are the causes of human error?

A 
Over familiarity
Failure to inspect equipment 
Shoddy work
Working in damp conditions
Failure to observe relevant safety
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8
Q

Give an example of equipment failure?

A

Casing of equipment becoming live

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9
Q

Give an example of a combination cause of electric shock

A

Failure to repair damaged leads

Using untested equipment

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10
Q

What would a 10mA electric shock do?

A

Cause you to be unable to release the grip on the supply

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11
Q

What value of current would cause physical damage?

A

20mA

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12
Q

What value of current would have the potential to kill

A

30mA

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13
Q

What “safe” voltages do the RN use?

A

24VDC

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14
Q

What is the resistance of the human body

A

1000 Ohms (although this can be reduced due to dampness)

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15
Q

What procedure would be followed in the event of an electric shock?

A

1) LVA
2) Isolate supply either by switching fuses or breakers
3) If 2 is not possible use a safety hook/insulative PPE to move the causality away from the source of the current
4) Check for response
5) Check their airways are open
6) Check that the causality is breathing
7) Call for help (Notify the HQ1)
8) Start CPR

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16
Q

How often is the earthing of cased electrical equipment checked?

A

Every 3 months

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17
Q

What hazards are associated with Tantalum Capacitors?

What mitigating actions should be taken when working on them?

A

1) They contain sulphuric acid and are liable to explode

2) You should wear a face covering

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18
Q

What hazards are associated with Selenium Rectifiers?

A

They contain selenium dust which is toxic.

Care should be taken to prevent its inhalation or ingestion

19
Q

What is Lotoxane?

A

Lotoxane is the only cleaning agent used on RN ships for electrical equipment

20
Q

What hazards are associated with lotoxane and what mitigating precautions should be taken when using?

A

It has a low flash point.

It should not be sprayed on live equipment or hot surfaces
The user should wear gloves
It should be used in well ventilated areas

21
Q

What PPE should be worn when working in the galley?

A

DMS Boots
Coveralls or No. 4’s with sleeves rolled down
Chefs Hat

22
Q

When would you work on LIVE electrical equipment?

A

NEVER ON HV.

Only when there is no alternative

23
Q

What is required when working on live electrical equipment?

A

Must be approved by the MEO
Must be supervised by an ME senior rate
Appropriate measure taken to prevent shock (PPE, Standing on a thick rubber mat, having a safety number

24
Q

What precautions can be taken when working on LIVE electrical equipment?

A 
Stand on rubber mating 
Wear rubber gloves
Wear insulating boot covers
Use insulated tools 
Avoid leaning on bulkheads
Be aware of the voltages present 
Take care not to cause short circuits with tools
Don't take unnecessary risks
Don't rely on interlocks or other safety devices
25
Q

What is the procedure for working on DEAD electrical equipment?

A

1) Isolate the equipment and carry out LOTO
2) Prove the circuit is dead by using GPTME (test between phases and between phase and earth, looking for a 0V reading)
3) Discharge any capacitors using GPTME set to voltage shorting across the terminals until V reads 0
4) Fit the required shorting straps to prevent the capacitors recharging

26
Q

What are the 4 parts (Paper work) of LOTO?

A

LOTO Index sheet
LOTO safety certificate
Red LOTO label
LOTO display board

27
Q

Where does part B of a LOTO label go?

A

On the LOTO display board

28
Q

What would you need to find from the LOTO index sheet

A

The next sequential LOTO serial number

29
Q

What are the 8 stages for the APPLICATION of LOTO?

A

1) Obtain permission
2) Identify all isolation points
3) Inform the user
4) Fill out the LOTO index sheet (LOTO log sec. 3) and collect the safety certificate serial number
5) Complete the relevant sections of the LOTO safety certificate
6) Complete LOTO log parts A, B and C
7) Ensuring the circuit is switched off, the isolation switches/breakers are open. Remove the fuses. Replace the empty fuse holder with “part A” attached
8) Place part B in the LOTO Board and Part C on the fuses in the fuse board

30
Q

What is the correct procedure for REMOVING a fuse?

A

Ensure the load is removed
With a finger in the centre of the fuse casing. Use a fuse key to slacken the screws and then fully loosen the screws
Looking away (in case of arch flash), smartly remove the fuse
Remove the fuse from the fuse housing
Replace the fuse housing to maintain a dead front and attach part A of the LOTO label to the front

31
Q

What is the correct procedure for REPLACING a fuse?

A

Remove one empty fuse holder from the fuse way
Using a piece of GPTME (set to V) across the empty fuse way check for dead (0V) - If voltage indicated do not replace the fuse
Using a correctly rated fuse, replace the fuse into the empty casing
Averting eye locate the fuse carrier smartly onto the bus bars
Whilst holding the carrier in place tighten with a fuse using a fuse key

32
Q

What is HV?

A

High Voltage
1000V AC
1500V DC

33
Q

What are the 3 specific terms used to describe the ships state in terms of HV?

A

HV Live
HV Dead
HV Safe

34
Q

What does a ship being HV Live mean?

A

Its capable of generating HV
Its generating HV
Its connected to a HV Shore supply

35
Q

What does a ship being HV dead mean?

A

The ship cannot generate, distribute or receive HV
All sources of HV are disconnected and isolated
The circuit main earth is applied

36
Q

What does a HV safe mean?

A

This refers to an area not the entire platform
The area is safe to enter
The HV power source is disconnected
The HV decay period has been elapsed

37
Q

Who is a competent person in regards to HV?

A

A person who has sufficient technical knowledge or experience to enable the person to avoid danger from electrical hazards.

38
Q

What documentation would be needed to control HV?

A

Permit to work (PTW)
Sanction for test (SFT)
Limitation of Access (LOA)
Switching Schedule (SS)

39
Q

What does arch flash cause?

A
  • Heat up to 20,000oC
  • Plasma Discharge
  • Very intense, blinding light
  • Pressure wave - Vaporized copper expands 67,000 times
  • Shrapnel - molten copper, insulation, pieces of switchboard
  • Sound 140-165 db. (permanent hearing damage)
  • Smoke
40
Q

Where can arch flash occur?

A

At a breaker or at the fuse

41
Q

What is the procedure for REMOVING LOTO?

A

1) Obtain permission to remove
2) Sign the LOTO certificate for the remove of LOTO request
3) Collect the right fuses and part B And C of the the LOTO label
4) Ensure the circuit isolation switches are open
5) Remove Part A and empty fuse holder, test across the fuse way for 0V, if dead replace fuse
6) Return all 3 parts of the LOTO labels to approving senior rate
7) Sign the LOTO safety certificate for LOTO removal and closure
8) Close LOTO index sheet entry (date and sign)
9) Destroy all LOTO labels, Transfer LOTO safety certificate to sec. 6 of Log

42
Q

What are the 6 main causes of accidents?

A 
Over familiarisation 
Lack of skill or ignorance 
Laziness or fatigue 
Preoccupation 
Physical Hazards
Horseplay
43
Q

When would additional testing for DEAD be done?

A

1) When there has been a break from work
2) When handing over to other personal
3) If inspections are required.

L Safety (1 decks)

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