Transcript Slide 1

Electrical Safety
While Working In and Around a
Lift Station
Presentation by
Dave Sayward President
Magnum Electric
Staying Safe in a
Dangerous Situation
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ID all hazards
ID all electrical sources
Lock out -Tag out
Know how to use your equipment
Above Ground Lift Stations
• Breaker Safety
• Puddles of water
around control panel
• Water leaks into the
control panel
• Danger
• Electrocution- water is
a conductor; electricity
jumps.
Below Ground Lift Stations
• ID the Hazards
• Air Quality
• Confined Space
• Electrocution
• Most stations have
metal ladders
• Engulfment
How FAST Can You Get Out?
• De energized at the
main source not at the
quick disconnect.
• ID the highest point of
conductivity not the
lowest elevation in the
station.
• Lock out- Tag out
saves lives.
Safe Working Principals
• All equipment must be
inspected by qualified
person.
• Open all motor
housings check for
water
• Open control panels
check for water
damage
Safe Working Principals
• Check air quality
• Know how to “check” for voltage or have a
qualified trained person perform the work.
• Always disconnect the power source from
the control panel if you are working on it.
• The main power source is for a lift station
is not a motor control disconnect
ARC FLASH HAZARD
• Electrons move at
186,000 miles/sec
• It can take 12 cycles
for a breaker to “trip”
• Plasma ( Blood)
vaporizes at 8000
degrees F
How to Check for Voltage
• Shut off power source
• Using a voltage meter
• Place the other probe
on the L1 and L2
• Check L1,L2, L3
respectively.
• Then L1, L2, L3 to
ground also.
How to test a Fuse
• Checking for
Continuity
• Shut off power source
• Check for voltage
• Using one of the meter
probe place it on one
end of the fuse
How to test a Fuse
• Remove fuse from the
fuse holder
• Using the meter
probes touch each end
cap of the fuse. If the
fuse is good the meter
will read closed.
• If the fuse is bad it
will read open.
Dangers of working on VFD
• The DC voltage is greater than 700 volts.
• Clear! Its 600 volts to start your heart or it
can stop it!
• There is stored voltage in capacitors in the
drive units even with the power off.
AMPS KILL
• 6 ma of an amp can
kill
• 4 ma can paralyzed
“shock” you. You
can’t LET GO
• Daily your body’s
resistance changesbased on body
moisture
Summary
• Work only on electrical
equipment your are
trained to work on.
• Only work with electrical
meters you have been
trained to use
• Always use your Lock
Out – Tag out program
when working on
electrical equipment.
• Only allow trained
qualified people to work
on your lift station control