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rn - etme > Electrical Safety > Flashcards

Electrical Safety Flashcards

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1
Q

what are short straps used on capacitors during maintenance

A

prevent them from recharging

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2
Q

what are the two parts of the long term LOTO log

A

Long Term index sheet
LOTO safety certificate

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3
Q

Precautions on dead electronic equipment

A
  • isolate/carry out tag procedure
  • prove that it is dead - GPTME
  • Discharge any capacitors - GPTME
  • if required, fir short straps, to stop recharge
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4
Q

What are the four major parts to the LOTO system

A

LOTO index sheet
LOTO label
LOTO Safety certificate
LOTO Display board

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5
Q

What is the procedure for LOTO

A
  • obtain permission
  • identify isolation points
  • inform the users
  • Fill out the LOTO index sheet in section 3 and collect serial number
  • complete sections on LOTO safety certificate
  • ensure equipment is off and isolated, then attach part A to the emptry fuse holder
  • place part B on the relevent section on the LOTO board
  • attach part C to the removed fuses and place them in the fuse box
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6
Q

What should happen to the labels after reinstalling a LOTO

A

Handed back to the authorising person and destroyed

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7
Q

What is a CP

A
  • Capable person
  • person who has sufficient technical knowledge
    has experience in the subject
  • avoids danger from hazards
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8
Q

What is the resistance of the human body, when dry

A

1K ohms (1000 ohms)

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9
Q

What is HV safe

A
  • informs personal that a compartment is safe to enter
  • all forms of HV power sources are disconnected
  • Appropriate HV decay periods have elapsed
  • only used with the clearly identified compartment
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10
Q

What is HV Dead

A
  • ship is no longer capable of generating, distributing or recieving HV
  • All sources of HV supply are disconnected and isolated
  • With circuit main earths applied
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11
Q

What is LOTO

A

Lock-Off/Tag Out

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12
Q

What is the purpose of LOTO

A
  • provides a common method, for the isolation of mechanical/pneumatic, hydraulic and electrical systems/equipment
  • minimum level
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13
Q

how would you prove that a circuit is dead before working on it

A

by measuring zero volts between phases and between phase and earth

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14
Q

What is HV live

A
  • that HV can be generated
  • informs peronel that HV is being generated
  • That the ship is connected to an external HV shore supply
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15
Q

Reasons for isolating supplies using the LOTO system

A
  • allows maintenance to proceed without hazard to equipment
  • isolate equipment that is defective and its operation may be dangerous
  • prevention of ‘mode selection’ of operation equipment, may be dangerous or unavaliable
  • where equipment has been removed
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16
Q

what are the three hazardous components you encounter

A
  • tantalum capacitors
  • selenium rectifiers
  • loxotane
17
Q

list the three types of hand-over switchs

A
  • Normal/Alternative change over
  • Normal/Emergancy chane over
  • Normal/Alternative/Emergancy change over
18
Q

How do we tackle the accident problem

A
  • know the hazard
  • maintain safety discipline
  • develop the habit of noticing potential dangers
19
Q

What is GPTME

A

General Purpose Test Measuring Equipment

20
Q

Precautions to be taken when working on live electronics

A
  • Ask for authorisation
  • dont take risks
  • use insulated tools
  • use rubber mats
  • Never on volts about - 1000v AC / 1500v DC
  • wear correct PPE
  • All equipment is to be indate/tested
    *Don’t work alone
    *Know the voltage being worked on
    *Don’t lean
    *Don’t rely on safety equipment
21
Q

What happens to the human body when exposed to
* 1ma
* 10ma
* 20ma
* 30ma

A
  • 1ma - involuntary reaction
  • 10ma - prevent you rom releasing
  • 20ma - physical damage
  • 30ma - can kill
22
Q

What voltage on board is considered to be ‘safe’

A

24V DC

23
Q

What are the major causes of accidents

A
  • physical hazards
  • pre-occupation
  • ignorance or lack of skill
  • over familiarty
  • lazyness or fatigue
  • horseplay
24
Q

What is Ohm’s law

A

V = I x R

25
Q

Describe the procedure for removing fuses

A
  1. place a finger in the center of the fuse holder
  2. freehand unscrews fuse holder using fuse key
  3. grasp holder, turn head away from fuse box and remove the holder
  4. remove from the holder and keep safe
  5. repeat the procedure for each fuse
26
Q

what are the results of electric shock

A
  • immediate death/unconsiousness
  • paralysis of the muscles or repiration, leading to asphyxia
  • electric burns
  • physiological shock
27
Q

what are the three main causes of electrical shock

A
  • equipment failiure (in-direct contact)
  • human failure (direct contact)
  • combination of both
28
Q

What is LOXOTANE

A

A degreaser for cleaning electronic equipment

29
Q

rules of use for LOXOTANE

A
  • wear gloves/PPE
  • use in ventilated environments
  • Dont spray onto hot surfaces
    *dont spray on live equipment
30
Q

what is the biggest fire hazard in the galley

A

deepfat fryer

31
Q

how are all galley supplies isolated in the event of a fire

A
  • big isolation switch box
  • painted red
  • outside the galley compartment
32
Q

What PPE should be worn while working in the galley

A
  • DMS boots
  • overalls/4’s with sleeves rolled down
  • chefs paper hat
33
Q

what is the correct electrical shock procedure

A
  1. raise the alarm (LVA)
  2. isolate the supply
  3. isolate the casualty from supply
  4. check for responce
  5. check airways
  6. shout for help
  7. perform correct medical actions
34
Q

what documents are requird for the control of the HV system

A

permit to work
sanction for test
limiation access
switching schedule

35
Q

what forms of energy are released from an arc flash

A

*heat up to 20,000’
*plasma discharge IR radiation
light, very intense uv radiation
pressure wave,
*vaporised copped expands up to 67000x
*shrapnel: molten copper, insulation, peices of switchboard
*sound - permanent damaged hearing

36
Q

What color are HV cables

A

normally RED
however sometimes black

rn - etme (7 decks)

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