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Wednesday, 21 September 2016

Electrical safety session

Electrical safety Session




Objective


Electricity - How it works


Electrical Terms


Is Electricity a HARM?


Electricity - A Good Slave but bad Master


Electrical Injuries


Electrical Injuries


Few facts about Electrical Injuries


Electrical Shock


Does Birds get Electrocuted?


Shock Severity


Dangers of Electrical shock


Burns


Internal injuries


Involuntary Muscle Contraction


Falls


Causes of Electrical Injuries


Unauthorized Operation


Earthing


Earthing


Transformer Neutral Earthing - Size of Earth lead.


Fuses


Single insulated cable


Cables


Cable joints


Hanging Cables


Without Plus top


Plug tops


Canopy and Rain Protectin


Over head lines


Working on Travelling Near Overhead High voltage cables


Working Near Overhead Lines


Unsafe Practices


Unsafe Conditions


PPE'S


What Regulations Says BOCWR Rules 1998; Rule No 47


First aid - Electrical shock


Thank you



Welcome to
Electrical Safety session


Electricity – How it Works
Electricity is the flow of energy from one place to another
Requires a source of power: usually a generating station
A flow of electrons (current) travels through a conductor

Travels in a closed circuit
Electrical Terms
Current -- electrical movement (measured in amps)
Circuit -- complete path of the current.                Includes electricity source, a conductor, and the output device or load (such as a lamp, tool, or heater)
Resistance -- restriction to electrical flow
Conductors – substances, like metals, with little resistance to electricity that allow electricity to flow
Grounding – a conductive connection to the earth which acts as a protective measure

Insulators -- substances with high resistance to electricity like glass, porcelain, plastic, and dry wood that prevent electricity from getting to unwanted areas

Is Electricity
a HARM
?
Electricity

A Good Slave
  but
  Bad Master,



Electrical Injuries 



Direct:
ØElectrical shock;
ØBurns;
ØInternal Damages;
ØInvoluntary muscular contraction;
Indirect – Falls

  (30 %  of Electrocutions are accompanied by fall)

Few facts about Electrical Injuries ;


Contributes to 6 – 7 % of construction accidents;
30 % of electrocution’s  are accompanied  by fall from height;
Fatality rate is more than Incidence Rate;     



Electrical Shock


An electrical shock is received when electrical
current passes through the body.
You will get an electrical shock if a part of your
body completes an electrical circuit by…
Touching a live wire and an electrical ground, or
Touching a live wire and another wire at a different voltage.




Does Birds Get

Electrocuted ?


It’s because the electricity is always looking for a way to get to the ground, but the birds are not touching the ground or anything in contact with the ground.


Shock Severity



Severity of the shock depends on:
Path of current through the body;
Amount of current flowing through the body (amps), which in turn depends on applied voltage;
Duration of the shocking current through the body,
LOW VOLTAGE DOES NOT MEAN LOW HAZARD






Dangers of Electrical Shock


Burns



Most common Electric - related injury;
Temp increases with current & resistance;
Occurs when you touch electrical wiring or equipment that is improperly used or maintained;
Typically occurs on hands
Very serious injury that needs  immediate attention



Internal Injuries


Excessive electricity cause serious damage to internal organs.
Resulting medical problems such as;
include hemorrhage (or internal bleeding);
tissue destruction;
nerve or muscle damage.
These internal injuries may not be immediately apparent to the victim or observers; however, left untreated, they can result in death.




Involuntary Muscle Contraction


Muscles violently contract by excessive amounts of electricity.
These involuntary contractions can damage
muscles,
tendons,
ligaments,
and may even cause broken bones.
If the victim is holding an electrocuting object, hand muscles may contract, making it impossible to drop the object and prolonging contact with the current. Also, injury or death may result when violent muscle contractions cause workers to fall from ladders and scaffolds or inadvertently strike other objects.






Falls


Electric shock can also cause indirect injuries 
Workers in elevated locations who experience a shock may fall, resulting in serious injury or death



Causes of Electrical Injuries




Unauthorized operation; 
without or improper Earthing;
Improper Fuses;
Single insulated Cable (s);
Improper Cable Joints; 
Hanging Cables;
Without Plug Top;   
DB’s without protection against rain & curing water;





Unauthorized

 Operation



MDB’s / SDB’s liable for unauthorized operations;
Electricians alone (with red helmet);
Electrical Connection;
Cable joints;
Other electrical related activities;
Electricians of “B” Grade license;   



Earthing



All the Electrical equipment shall be grounded;
DB’s shall be provided with double earthing;
Earthing conductor shall be capable of carrying of maximum current;
Earth Pits;







TRANSFORMER NEUTRAL EARTHING - SIZE OF EARTH LEAD




Fuses




Fuses are proven safety devices for overload conditions
Check the fuses for their current ratings
Never replace fuse wire with ordinary copper or aluminium wire
High rupturable cartridge (HRC) fuses are now a days easily available and has advantages over traditional fuses





Single insulated 

Cable


Protective insulation;
Mechanical protection against;
Abrasion;
Impact and shear load;
Fire retardant;
Functional insulation;
Only electrical insulation;
Low Shear strength  



Cables



Single phase supply
Phase - red
Neutral - black
Earth - green
Three phase supply
Phases
Red
Yellow
Blue
Neutral - black




Cable Joints


Staggered joints
Joints are not to be overlapped
One primary insulation and an overall secondary insulation is to be done
Proper insulation tape are to be used
Jointing kit





Hanging Cables


Cable hangers;
Cable stands / poles;

Cables shall be routed over head;




Without Plug Top



PLUG TOPS


Need of plug top;
To ensure the necessary contact pressure and contact gaps;
Right connections;
Chances of reverse rotation;
Earth pin
Longer among others;
Contact firsts;



Plug tops should be used to avoid shock danger.
Three point plug in case of metallic body hand tools and two point plug in case of double insulated hand tools.




Canopy and Rain 

Protection


Protection against rain and curing water;
Canopy shall be of MS.



Over Head Lines


Minimum Safe Clearance Required to be maintained;
(The Indian Electricity Rules, 1956; 64 (2) 




Working or Travelling Near Overhead High Voltage Cables.



Working Near Overhead Lines



Un Safe Practices


Un – Safe condition’s


PPE ‘s



What  Regulation Say’s ?
BOCWR Rules 1998; Rule No 47



First AID – Electric Shock



Don’t become the next victim;
Isolate the victim from the Circuit;
Disconnect the power supply;
Use Insulators;
High Voltage lines  contacts are usually fatal, better seek help from experts.
Check for breathing;
Artificial Respirations
Check for pulse;
Cardiac resuscitation
Emergency Response Plan 

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Abbreviation use for safety? (1) Accident investigation (1) Accident investigation Report? (1) Attitude (1) Authorized expose person? (1) Awareness - Electricity (1) Awareness - Malaria (1) Awareness - Swine Flu (1) Awareness - Typhoid (1) Awarness - cholara (1) Awarness message (49) Basic Electrical safety (1) Basic Orientation Training (1) Blasting awareness session (1) Carbone Monoxide (1) Chain Pulley Blocks (Do's) (1) Chain Pulley Blocks (Don'ts and Do's) (1) Classes of fire (1) communication and writen communication (1) Community unrest situation (1) competent persons? (1) Compressed Gas cylinder (1) confined space (2) confined space attendant? (1) Confined space awareness session (1) Confined space? (1) contingency plan - Accident / Incident (1) contingency plan - fire (1) contingency plan - Gas leak (1) Controlled area? (1) Cyclone (1) Defensive Driving (2) Density and specific Gravity (1) Do and Don't awareness session (1) Driving awareness session (1) Duties of a confined space attendant? (1) Earthquake (1) EHS Alert - Adverse Weather (1) EHS Alert - Air compressor (1) EHS Alert - Arc welding (1) EHS Alert - Bar Bending Machine (1) EHS Alert - Batching plant (1) EHS Alert - Cold weather (1) EHS ALERT - DENGUE (1) EHS Alert - Earth Quake (1) EHS Alert - Ebola (1) EHS Alert - Eye exposure to Portland cement (1) EHS Alert - Heat Stress (1) EHS Alert - Hot weather (1) EHS Alert - House Hold LPG (1) EHS Alert - Monsoon (1) EHS Alert - Motor cycle Helmet (1) EHS Alert - Paper (1) EHS Alert - Road / Traffic signs (1) EHS Alert - Snake Bite (1) Electrical safety (2) Electrical safety session (1) Element and Molecules (1) Emergency Evacuation Plan? (1) Employee Hand Book (1) Empty Fuel Container (1) Environment - Air pollution (1) Environment - soild waste disposal (1) Environment - Water pollution (1) Environment -Noise pollution (1) Environmental Management session (1) Ergonomics (1) Excavation safety - awareness session (1) explain each one? (1) Films (1) Fire (1) Fire fighting - Training / awareness session (1) Fire Fighting and prevention session (1) Fire Hazards and prevention (1) Fire Hazards and prevention Strategy (1) Fire Prevention session (1) Fire Protection (Do's and Dont's) (1) Fire Protection (Do's) (2) First Aid (1) First aid - Electrical (1) First aid - Electrical injuries (1) First aid - Fracture (1) First Aid – Eye Injury & Burns (1) Flood (1) Gas Cylinder Safety (Dos and Don'ts) (1) Gas Cylinder Safety (Dos) (1) Gieger meter? (1) Global warming (1) Global warming awareness (1) Grinding (Dos) (2) Grinding Safety (1) Hand-held Grinders (1) Hazardous job in a confined space? (1) Hazards (1) Hazards in a confined space (1) Heart Attack (7) Heart attack awareness session (1) Heat (1) How can extinguish and common type of fire extinguisher? (1) How is the soil classified? What is the slope to be given for each type of soil while excavating? (1) How many scaffolding tags used in scaffolding? (1) How many type of Fall Protection system? (1) How many types of accident in construction area? (1) Hydro Testing (1) Importance of Tool-box meeting (1) In what circumstances fall protection system has to be used? (1) In what situation “ear protection is needed”? (1) In which condition a scaffold cannot be erected? (1) Inspect scaffold (1) INSTRUCTION FOR STORAGE OF ELECTRICIAN’S GLOVES AND PRECAUTION S TO BE TAKEN BEFORE & AFTER USE. (1) Investigation (1) Jab safety Analysis (JSA) (1) Ladder safety (1) Ladder safety (Do's and Don'ts) (1) Ladder safety (Do's) (1) Lifting plan? 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(1) What are the precautions to be taken while handling and storing compressed cylinders? (1) What are the safety requirements for doing a hot work? (1) What are the scaffoldings and its kinds and it’s Consists? (1) What are the type of fire extinguishers commonly used and briefly (1) What is a guard rail system? (1) What is a life-line? (1) WHAT IS A NEARMISS? (1) WHAT IS ACCIDENT? (1) What is an “Assembly Point" and Head counting procedure? (1) What is color coding system? (1) What is Confined Space? (2) What is different between a flash back arrestor and a check valve? (1) What is Evocation? (1) What is excavation? (1) What is Fire (1) What is First Aid and CPR? (1) What is heat stroke? What are the different stage through which a person undergoes before he gets heat stroke? (1) What is lock-out/tag-out system? (1) What is LOTO? (1) What is method statement? (1) What is MSDS ? (1) What is Radio activity? (1) What is Risk Assessment? (1) What Is Safe working Load (SWL)? (1) What is Safety? (1) What is tag system? (1) What is the emergency evacuation procedure to follow in the event of a gas release? (1) What is the responsibility of Fire Watch? (1) What is Toolbox Talks? (1) What is trench? (1) WHAT IS WASTE MANAGEMENT? (1) What safety measure are required for SAFE CRANE OPERATION (1) Who can place a scaffold tag? (1) Who is your safety officer? (1) WHO MAKES AN ACCIDENT REPORT? (1) Why Safety Training is required? (2) width of walk-way (1) Work Management System (1) work permit? (1) Work Radius? (1) Working at height (1) Working in Confined Space (1) Workplace Heat illness (1)

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