L-Safety Flashcards by Elliot Dicker

what are the six major causes of accidents?

1.pre-occupation
2.igroance or lack of skill
3.over familiarity
4.laziness / fatigue
5. physical hazards
6.horseplay

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why do we need to know the hazards

so that we know what to expect when starting a job and what PPE is required

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why are SOPs important?

as they are written to do the job in the safest way quickly.

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why do you need to notice hazards regularly?

so that we are always aware of them so always look for danger before starting a job.

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what is a electric shock ?

current passing through the body to earth

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what is human error

direct contact with a conductor by a error.
failure to observe safety precautions
not reporting defects
inspect equipment

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what is equipment failure?

break down of the insulators around the conductor which can then touch the casing
indirect contact.

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what is the rough resistance of a human body?

1k ohms can be lowered by damp skin

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what current can kill you?

30mA

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is it current or voltage that kills you?

current will kill you not voltage

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what is the only voltage considered to be safe on board

24volts DC
but no supply is really safe

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what are the effects of electric shock

death / unconsciousness
asphyxia
burns
physiological shock

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what happens when you are exposed to 1mA?

involuntary response

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what happens when you are exposed to 10mA?

unable to release hold

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what happens when you are exposed to 20mA?

physical damage

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why is LOTO important?

as it prevent the energising of equipment you are working on which could lead to a accident

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when can a system can be turned back on
(there u go dale)?

when section 2 is completed
only done by team leader or originator

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what are the steps to prevent accidents?

know the hazards
maintain safety discipline
develop habit of noticing hazards

what are the procedure for electric shocks

Loud Vocal Alarm
isolate the supply
remove the casualty if possible
DRABC

what is the LOTO procedure

+
fill out LOTO index sheet
fill out part A B and C of the tag
place part A on the fuse board
Place part B on the LOTO Board
attach part C to the fuse
place the fuse and part C by the LOTO board

what is the isolation procedure?

obtain permission
identify all isolation points
inform all users
fill out LOTO index and tag
attach part A to fuse empty fuse holder
place part B on LOTO board
place Part C on fuses

what are the four hazardous component?

tantalum capacitors
selenium rectifiers
penetone / lotoxane
radio active valves

what is the danger of a tantalum capacitors?

can explode when to much current or voltage is passed through realising sulphuric acid
full face protection required

what is the danger of a selenium rectifiers?

release toxic dust if burnt out
do not inhale or ingest dust

what is the danger of lotoxane?

degreaser for electrical contacts fume inhalation where gloves use in ventilated space do not spray on hot surfaces

what is penetone TPC / lotoxane

degreaser 12 months shelf life 53 degrees c flash point keep away from flames not use on HM submarines

what are the signs for radioactive valves?

class one - theta signs class two - trefoil sign with class 2 hazard - trefoil sign with caution

what PPE is need for the galley?

DMS boots Sleeves down on 4's or overalls chef's paper hat

how do you isolate the galley from outside it?

pull the red galley isolation switch

what is the most dangerous piece of kit in the galley?

Deep fat fryer

when should you work on live equipment?

when there is no alternative and must be approved by the MEO and supervised by a ME senior rate never on HV 1,000v ac or 1,500v dc

precautions for working with Live electrical equipment

1.do not take unnecessary risks 2.wear rubber glove if practicable 3.use insulated tools 4.stand on rubber insulating mats 5.avoid leaning on bulkheads or equipment(secondary injuries) 6.wear insulating footwear 7.beware of voltage that could become live 8.don't rely on interlocks or other safety devices 9.don't bypass safety devices 10.don't work alone 11.work one handed 12.don't cause short circuits 13.ensure all portable equipment is tested and in date

what are the precautions for working on dead electrical equipment?

YOU prove it is dead isolate and carry out the correct lock out prove it is dead again using GPTME

how do you prove dead?

check the voltage between all 3 phases should be 0 volts check each phase between know good earth discharge any capacitors and fit with shorting strap

what is the job of a change over switch?

to allow one piece of kit to use two supplies

what are the 3 types of hand change over switches?

normal / alternative normal/ emergency normal / alternative / emergency

what does HCOS stand for?

Hand Change Over Switch

why do you never change HCOS when running?

it will kill the equipment its running

how do you supply a motor with a HCOS

switch the motor off wait for it to stop spinning by sight or wait 10 secs switch to alternative restart the motor

what is high voltage

working voltage exceeding 1000 volts AC (RMS) or 1500 Volts DC

what are the terms associated with HV

HV live ( generating or connected to HV) HV dead( not generating or receiving HV) HV safe(all sources discounted and HV decay period elapsed)

how are the key personal in terms of HV

authorising engineer (MEO) authorising person in control (APC) authorising person(AP) competent person (ME dept.) HV aware(everyone on board)

what is the documentation for HV

permit to work(PTW) sanction to test(SFT) limiting access(LOA) switching schedule (SS)

what is arc flash?

current jumping a air gap between phases/neutral/ earth causing plasma