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L Safety > Electric Shock > Flashcards

Electric Shock Flashcards

1
Q

Six major causes of electric shock

A

Pre occupation
Ignorance, lack of skill
Over familiarity
Fatigue
Physical hazards
Horseplay

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2
Q

Three steps to minimize or eliminate accidents

A

Know the hazard
Maintain safety discipline
Develop the habit of noticing dangers

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3
Q

Basic causes of electrical shock

A

Equipment failure (indirect contact)
Human failure (direct contact)
Combination of both

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4
Q

Reactions to different amps

A

1mA - involanrty reaction
10mA - prevent from releasing grip
20mA - physical damage
30mA - can kill

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5
Q

Dry body resistance

A

1 Kohm

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6
Q

Electric shock procedure

A

Raise the alarm

Isolate person from supply

If not possible,stand on dry insulating material push pull casualty clear of supply

Loud vocal alarm

Check for response

Carry out CPR if needed

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7
Q

What does LOTO do

A

Allow maintenance to proceed without hazard

Isolate equipment that is defective
and it’s operation may be defective

Prevent selection of mode of operation that may be unavailable or dangerous

Where supply’s have been provided but equipment is yet to be installed

Equipment been removed

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8
Q

4 sections of LOTO

A

LOTO safety index

LOTO safety certificate

LOTO label

LOTO display board

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9
Q

Where do the parts of LOTO label go

A

Part A: point of isolation

Part B: tag out board

Part C: fuses taken out or key

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10
Q

Order of LOTO tag out

A

Obtain permission from senior rate

Identify all isolation points

Inform all users

Complete LOTO index

Complete LOTO safety certificate

Complete LOTO labels A,B,C

Turn equipment off

Remove fuses or lock off main circuit breaker and attach part A

Part B of label on LOTO board

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11
Q

Fuse removal

A

Machine is off

Place thumb on middle of breaker

Unscrew fuse holder with fuse key

When fully unscrewed firmly grasp fuse holder, turn head away and remove fuse.

Remove fuse from holder and keep safe

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12
Q

How to remove a LOTO

A

Inform senior rate

Complete section 2 of LOTO safety certificate

Collect fuses and part B and C of LOTO label

Remove part A of LOTO label from fuse holder and replace fuses

Return all LOTO labels to senior rate

Authorising person completes section 2a of safety certificate

Person removing LOTO completes section 2a

Authorising person completes LOTO closed portion of 2a

Destroy LOTO labels

transfer LOTO safety and transfer safety cert to LOTO log sec 5

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13
Q

Replacement of fuse

A

Remove one empty fuse holder from fuse way

Test voltage across fuse way to ensure dead

Ensure you use correct rated fuse

Averting eyes locate fuse carrier on bus bars

Tighten with fuse key whist holding the fuse carrier

Person completing the LOTO should have parts A,B,C in possession for inspection by senior rate

Complete section 2a of safety certificate

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14
Q

Hazardous components and materials

A

Tantalum capacitors

Selenium rectifiers

Lotoxane

Radioactive valves
Class one-theta sogn
Class two-trefoil symbol with words class two
Hazard-trefoil with word hazard

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15
Q

Galley ppe

A

DMS boots
Overalls or 4s with sleeves down
Chefs hat

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16
Q

Live electrical precautions

A

Do not take risks
Wear rubber gloves
Use insulated tools
Stand on rubber insulating mats
Be aware of voltages present
Do not rely on interlocks
Don’t work alone
Work with one hand

17
Q

Dead electrical equipment precautions

A

Isolate and carry out tag-out procedure

Prove dead with GPTME testing between phases

Discharge any capacitors

If required fit shorting straps to capacitors

18
Q

3 types of change over switch

A

Normal/alternate
Normal/emergency
Normal/alternate/emergency

19
Q

Are changeover switches operated while running

A

No

20
Q

Definition of high voltage

A

1000V AC or 1500V DC

21
Q

HV definitions

A

HV LIVE- ship is generating, is capable of generating, or is connected to HV shore supply

HV DEAD- ship is no longer capable of generating, distribution or receiving HV. All sources of HV are isolated with main earth’s applied

HV SAFE- informs a particular compartment/area is safe to enter

22
Q

HV system use of documents

A

Permit to work (ptw)
Sanction for test(sft)
Limitation of access(loa)
Switching schedule(ss)

23
Q

HV arc flash hazards

A

Heat: 20,000C
Plasma discharge: IR radiation
Light: blinding
Pressure wave
Shrapnel
Sound
Smoke

24
Q

Only safe voltage

A

24v dc

L Safety (1 decks)

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