ELECTRICAL SAFETY
OSHA Code 29CFR 1910 Subpart S
Electrically Powered
Laboratory Equipment
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Computers,
lasers,
heating mantles,
ultrasonicators,
power supplies,
oscilloscopes,
microwave ovens,
hot plates,
vacuum pumps
etc. etc.
These devices can cause hazards if
mishandled or not maintained.
ELECTRICAL SAFETY
• Electrical Hazards
• Preventing Hazards
• Safe Work Practices
Electrical Hazards
Major Hazards
1. Electrical shock
2. Fire Hazard
Electrical shock
Electrical Hazards
Reasons:
• Contact with both wires of an electrical
circuit
• Contact with one wire and the ground or
a metallic part
SEVEROTY FACTOR
OF
ELECTRIC SHOCK
Electrical Hazards
• The pathway through the body.
• The amount of current.
• The time duration of exposure.
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and whether the skin is wet or dry.
Electrical Hazards
Effect of Electrical shock
• A slight tingle
• Severe burns
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Fibrillation
Electrical Hazards
Effects of electricity on the body
Milliamperes (Thousands of an ampere)
Body Effect
DC Voltage
AC Voltage 60 hz
No sensation on hand
0.6 - 1
0.3 - 0.4
Slight tingling
3.5 - 5.2
0.7 - 1.1
Non-painful shock, muscular control not lost
6-9
1.2 - 1.8
Painful shock, muscular control not lost
41 - 62
6-9
Severe shock, muscular control lost, difficult breathing
60 - 90
15 - 23
Fibrillation from shock, 3 second duration
500
100
Fire Hazard
Electrical Hazards
• Sparks from electrical equipment & ignition of
flammable or explosive vapors or combustible materials.
• Stored flammable or toxic vapors may be released when
e.g. electrically operated refrigerator or freezer fail.
• Fume hoods may cease to operate, allowing flammable
vapors to be released into the laboratory.
Fire Fighting
Electrical Hazards
• Fire Detection
Visual, Auto
• Fire Extinguishing
Manual, Auto
Fire Detectors
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Manual Fire Alarm Box
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Heat Detectors
• Smoke Detectors
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Radiant Detectors
Electrical Hazards
Electrical Hazards
Fire Extingushing
• Water
• Gas
• Chemicals
7
DO NOT FIGHT A FIRE IF:
You don’t know
what is burning!
• Wrong extinguisher can make things worse
• Risk of toxic fumes, explosion hazards
8
COMMON FIRE
CLASSIFICATIONS
“Ordinary” combustibles
Paper, wood, rubber, plastics
and textiles.
“Flammable liquids”
Oil, gasoline, solvents
“Energized circuits”
Electrical equipment
and computers
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MULTI-PURPOSE RATED
Extinguishers
either
or
• CO2 or
• Dry Chemical
Commercially Available
Fire Exnigushing Cylinders
Class A
Class B
Class F
Class A+B
Class A+B+C
12
Extinguisher
Common features
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Locking pin
Carrying handle / operating lever
Pressure gauge
Label :
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Type (Water, C02, Dry Chemical)
Classification (A, B, C)
Capacity Rating
Instructions
• Discharge nozzle or horn
14
Remember the P(t)ASS word:
20
OK, It’s out…
Now What?
• WATCH the fire area
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If the fire flares up again repeat!
If you can’t control the fire, LEAVE immediately!
immediately
• Call the safety department to inspect the area!
Preventing Electrical
Hazards
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Insulation
Guarding
Grounding and
Electrical protective devices.
Preventing Electrical Hazards
Insulation
• All electrical cords should have sufficient
insulation to prevent direct contact with
wires.
• Damaged cords should be repaired or
taken out of service immediately,
especially in wet environments.
Some insulating equipment
Matting,
Gloves
Insulated blankets,
Arc Flash Protective Clothing
Guarding
Preventing Electrical Hazards
• Guard live parts of electric equipment
operating at 50 volts or more against
accidental contact. Plexiglas shields may
be used
• Use three-prong plugs .The third
prong (Earth)provides a path to
ground for internal electrical short circuits.
Preventing Electrical Hazards
Grounding
• Always use
three-prong
plugs
• Ground the third
prong
Protection Devices
• Circuit protection devices
• Circuit breakers and
• Fuses
Protection Devices
• Ground-fault circuit interrupters,
or GFCI
It shall shutoff electric power if a ground
fault is detected. The GFCI is particularly
useful near sinks and wet locations.
• Circuit breakers and fuses
Fuses and circuit breakers
prevent over-heating of wires
and components. They disconnect the
circuit when it becomes overloaded.
Safe Working Practices
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Inspect wiring of equipment before each use.
Replace damaged or frayed electrical cords immediately.
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Know the location and how to operate shut-off switches
and/or circuit breaker panels.
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Shut off equipment in the event of a fire or electrocution.
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Limit the use of extension cords.
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Multi-plug adapters must have circuit breakers or fuses.
continued
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Minimize the potential for water or chemical spills on or
near electrical equipment.
• Avoid contact with energized electrical circuits.
• Disconnect the power source before servicing or repairing
electrical equipment.
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When working with a plugged in equipment :
Be sure hands are dry and, when possible, wear
nonconductive gloves and shoes with insulated
soles.
Work with only one hand, keeping the other hand at
your side or in your pocket, away from all
conductive material.
continued
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Minimize the use of electrical equipment in cold rooms
or other areas where condensation is likely.
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If water or a chemical is spilled onto equipment, shut off
power at the main switch or circuit breaker and unplug
the equipment.
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If an individual comes in contact with a live electrical
conductor, do not touch the equipment, cord or person.
Disconnect the power source from the circuit breaker or
pull out the plug using a leather belt.
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Repairs of high voltage or high current equipment should
be performed only by trained electricians.
continued
• Any modifications to existing electrical service in a
laboratory or building must be completed or approved by
the building authority
• All modifications must meet both safety standards and
facilities engineering design requirements.
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Any unapproved laboratory facilities modifications may be
reviewed by Engineering Department to determine whether
they meet design specifications.
5 dumb things smart people do while
working with electricity
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1. Replace the original fuse with a cheaper one
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2. Use a bit of wire or metal to get around the fuse all
together.
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3. Use the wrong test tool for the job.
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4. Work on a live circuit.
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5. Keep both hands on the test.
First Aid
• Separate victim
from current with a
non-metallic
insulator
• Check ABC
• Call the doctor
A
Open victims airway
B
Look & Listen for Breathing
C
Check for a pulse
Place the victim in a
recovery position
EMS –
LUMS, EMERGENCY
MEDICAL SERVICE
8:30 a.m. – 12:00 midnight)
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12:00 midnight to 8:30 a.m.
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From campus phone Call
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From cell phone call
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Jamal Abdul
Nasir
03335272336- Room 205,
M2
Ahsan
Ali
03343629004- Room
315, M3
Joshua
Gill
03343517704- Room
108, M5
Farhan ul
Haq
03454242533- Room
116, M2
Gull Hassan
Chisti 03218665116- Room 117,
M3
Yahya
Azeem
03214344341- Room
106, M4
1122
• 03328400542
• 03004014243
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IMPORTANT
EMS IS INTENDED FOR MEDICAL
EMERGENCIES OR ACCIDENTS, WHERE AS
MEDICAL CONDITIONS AND COMMON MEDICAL
TREATMENTS SHOULD BE REFERRED TO THE
DOCTOR.
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LUMS – DOCTOR
If you are:
·
·
Sick, or have a common medical problem
Minor cuts, bleeding or skin allergy, fever etc
(Call LUMS –Doctor at
3805
Time
• 3:00p.m. to 7:00 p.m. Monday to Friday
Office
• 12-A Sports Complex
)
STUDENT COUNSELOR
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If you are seeking counseling, kindly feel free to contact
and schedule a free & friendly counseling session.
• Call 3804
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Time
10:00 a.m. to 12:00 noon
Mon, Tue, Thu & Fri
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Office
11-A Sports Complex
Some other emergency
numbers:
• Police
• Rescue
services
• Electricity
• Edhi Ambulance
• Civil Defense
• Fire Brigade
15
1122
03064350204
042 7579173
042 37352828
042 37310354
THANKS