Wednesday, 21 September 2016

Electrical safety session

Electrical safety Session


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


Internal injuries

Involuntary Muscle Contraction


Causes of Electrical Injuries

Unauthorized Operation



Transformer Neutral Earthing - Size of Earth lead.


Single insulated cable


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


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 Good Slave
  Bad Master,

Electrical Injuries 

ØElectrical shock;
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,

Dangers of Electrical Shock


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
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.


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;



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;   


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;



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 


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


Single phase supply
Phase - red
Neutral - black
Earth - green
Three phase supply
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


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 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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