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Wednesday, 21 September 2016

Welcome to Basic Electrical safety

Welcome to Basic Electrical safety


Objectives



Basic Electrical safety



Objectives



Objectives



Fundamentals of electrical Hazards



Fundamentals of electrical Hazards


Fundamentals of electrical Hazards


Fundamentals of electrical Hazards


Electrical protection


Electrical protection


Terminology


Electrical grounding


Electrical grounding


Electrical grounding


Electrical grounding


Electrical grounding


Fundamental of Electrical Hazards


Fundamental of Electrical Hazards


Fundamental of Electrical Hazards


Basis Rules of Electrical Action


Preventing Accidental Electrical Contact


Do's and Don's


Do's and Don's


Do's and Don's


Do's and Don's


Do's and Don's


Do's and Don's


Do's and Don's


Myths and Misconceptions


Myths and Misconceptions


safety first


Thank you.

Welcome to 
Basic Electrical Safety


Basic Electrical Safety

Ö  Course not designed to teach you
   to work on electrical equipment.
Ö   You will not be qualified to work on   electrical equipment.
Ö  If you spot problems with electrical   equipment you should report it to   your supervisor.



Objectives

Be familiar with the fundamental concepts of electricity.
Be familiar with the effects of electricity on the human body.
Be able to recognize common electrical   hazards.
Be familiar with electrical protective devices.


Fundamentals of Electrical Hazards

To flow electricity must have a complete path.
Electricity flows through conductors
water, metal, the human body
Insulators are non-conductors
The human body is a conductor.
Have You Ever Been Shocked?

Ö  More than 3 ma
  painful shock
Ö  More than 10 ma
  muscle contraction “no-let-go” danger
Ö  More than 30 ma
  lung paralysis- usually temporary
Ö  More than 50 ma
  possible ventricular fib. (heart dysfunction, usually fatal)
Ö  100 ma to 4 amps
  certain ventricular fibrillation, fatal
Ö   Over 4 amps
  heart paralysis; severe burns. Usually caused by >600 volts
Hazards of Electricity
Electrocution/Shock/Burns/Death
Minimum distance from overhead lines 10 ft.
Inspect all electrical tools and equipment
Frayed, cut, broken wires
grounding prong missing
Improper use of cube taps
improperly applied or missing strain relief

Electrical Protection

Circuit Breakers
Provided to protect EQUIPMENT not people
Do not reset breakers with a line voltage higher than 120V and only reset if you know why it tripped
GFCI’s
- Provided to protect people
- Trip range 4-6ma
-  Monthly test
Distance
If you sense the presence of an electrical hazard or exposed conductors that may be energized, keep your distance and STAY AWAY


Terminology

Electrical Grounding

Fundamentals of Electrical Hazards

Voltage
electrical pressure (water pressure)
Amperage
electrical flow rate (gallons/min)
Impedance
restriction to electrical flow (pipe friction)
Circuit
path of flow of electricity
Circuit Element
objects which are part of a circuit and
through which current flows.
Fault
current flow through an unintended path.
What is Grounding?
Protection from electric shock
normally a secondary protection measure
A ground is a conductive connection
between electrical circuit or equipment and earth or ground plane
creates a low resistance to the earth.


Basic Rules of Electrical Action

Electricity isn’t live until current flows

Electrical current won’t flow until there is a complete loop, out from and back to the power source.

Preventing Accidental Electrical Contact

Do’s and Don'ts

Do plug power equipment into wall receptacles with power switches  in the Off position.
Do unplug electrical equipment by grasping the plug and pulling. Do not pull or jerk the cord to unplug the equipment.
Do not drape power cords over hot pipes, radiators or sharp objects.
Do check the receptacle for missing or damaged parts.
Do not plug equipment into defective receptacles.
Do check for frayed, cracked, or exposed wiring on equipment cords.
Do check for defective cords clamps at locations where the power cord enters the equipment or the attachment plug.
Extension cords should not be used in office areas. Generally, extension cords should be limited to use by maintenance personnel
“Cheater plugs”, extension cords with junction box receptacle ends or other jury-rigged equipment should not be used.
Consumer electrical equipment or appliances should not be used if not properly grounded. (Look for the UL Label)
Employees should know the location of electrical circuit breaker panels that control equipment and lighting in their respective areas. Circuits and equipment disconnects must be identified
Temporary or permanent storage of any materials must not be allowed within 3 feet of any electrical panel or electrical equipment.
Any electrical equipment causing shocks or with high leakage potential must be tagged with a Danger tag or equivalent. 

Myths and Misconceptions

Electricity takes the path of least resistance.
Electricity wants to go to ground.

If an electric tools falls into a sink or tub of water, the item will short out.
AC reverse polarity is not hazardous.
It takes high voltage to kill; 120 volts is not dangerous.
Double insulated power tools are doubly safe and can be used in wet and damp locations.

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