OSHA focus four electrocution hazard Flashcards
What 4 types of hazards result in 90 % of work deaths
falls
caught in-or-between
struck-by
Electrocution
What are the leading types of electrocution hazards
overhead power lines
machinery and appliances
electrical equipment
energized objects
What voltage accounts for the most injuries at the work place and at home
> 600
Volts
what is considered low voltage
any system less then 600 V
dry, clean unbroken skin has a resistance of
100,000
wet or broken skin has a resistance of
1,000 ohms
how much higher is the current through wet skin then the current through dry skin
100x
what is the resistance of internal body fluids
300 ohms
What happens when current passes through the heart
ventricular fibrillation
what does ventricular fibrillation do
it causes the heart to stop pumping blood through the body
what is the lowest current that can cause death
0.05ampers or 50 milliamps
What current are most home breakers rated to trip
15 amps
what is the relationship between wire gauge, size and ampacity
the lower the gauge the larger the wire and the more current it can contain
are multiple cords allowed for fixed equipment
no
what are the 6 main electrical hazard categories
(they form the acronym besafe)
burn
electrocution
shock
arc flash
fire
explosion
what are the three type of electrical burns
electrical
arc/flash
thermal contact
how shock defined
the reflex response to the passage of electric current
how high can an arch flash be
35000
Should GFCI be used for all power tools
yes
what construction activity causes the most electrocution
excavation
when should underground locate services be used
24 inches either way where the buried services are
OSHA requires two programs for construction using temporary power
GFCI
AEG
where can min clearance distances for working near power lines be found
OSHA regulations
What ate three types of GFCI
receptacle
temporary or portable
circuit breaker GFCI
what does conductor sized 14/3 mean
it is gauge 14 and has 3 wires
should ladders be non-conductive
yes
what does lock out tag out do
prevents contact with operating equipment parts
lock out- use locks to prevent unwanted electrical equipment activation
tagout- practice of using tags with locks to increase visibility and awareness that the lock is protecting someone’s life
Authorized tagout person
some one who is incharge of lock out tag out
affect person
some one who operates on the equipment that is locked out tagged out
what is important to do to capacitors when locking out
deplete any stored energy
what are the 5 major causes of lockout/tagout injuries
accidental restarting
failure to release residual energy
failure to disconnect from power source
failure to clear work area
failure to stop equipment
are wires less then 3-wire dangerous
yes
cord should always be what when they can
overhead and able to be seen clearly
how often should you test GFCI’s
monthly
what type of fire extinguisher should you never use
a type a
how will foot ware for electrical workers be marked
EH
fuses are meant as protection for
equipment
what type of helmet is required for electrical work
class E helmets
can employers deenergize power lines
yes as long as they work with the electric company
should metal covers for electrical equipment be grouded
yes
what does ARGCP represent and who runs it
Assured Equipment grounding conductor program
OSHA
OSHA requires flexible cord to rated for
hard and extra hard usage
why should extension cords be 3 wire type
so that they can be grounded
How does OSHA define ectrocution
death by electricity
