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Basic electrical safety training

Basic electrical safety training


Basic electrical safety training



Electrical safety Objectives


Electrical safety Objectives

Basic Electrical safety


Basic Electrical safety

* Course not designated to teach you to work on electrical equipment

* You will not be qualified to work on electrical equipment.

* If you spot problems with electrical equipment you should report it to your supervisor.

Electrical Objectives


Electrical 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.

Electrical Objectives


Electrical Objectives

* Be familiar with electrical protective devices.

Fundamentals of electrical Hazards


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.

Fundamentals of electrical Hazards

Fundamentals of electrical Hazards

* Have you ever been shocked?

Fundamentals of electrical Hazards

Fundamentals of electrical Hazards

* More than 3 ma - Painful shock

* More than 10 ma - muscle contraction "no-let-go'' danger

* More than 30 ma - lung paralysis - usually temporary

* More than 50 ma - possible ventricular fib. (heat dysfunction, usually fatal)

* 100 ma to 4 amps - certain ventricular fibrillation, fatal

* Over 4 amps - heart paralysis, severe burns. Usually causes >600 volts.

Fundamentals of electrical Hazards

Fundamentals of electrical Hazards

* Hazards of Electricity - Electrocution / shock/ Burns/ Death

* Minimum distance from overhead lines 10 ft.

* Inspect all the electrical tools and equipment

Frayed, cut, broken wires
grounding prong missing 
improper use of cube taps
improper applied or missing strain relief


Electrical protection

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 4-6 ma

- Monthly test



Electrical protection

Electrical protection

* Distance

- If you sense the presence of an electrical hazard or exposed conductors that may be energized , keep your distance and STAY AWAY

Terminology

Terminology

Electrical grounding

Electrical grounding

Electrical grounding

Electrical grounding

Electrical grounding

Electrical grounding

Electrical grounding

Electrical grounding

Electrical grounding

Electrical grounding

Fundamental of Electrical Hazards

Fundamental of Electrical Hazards

* Voltage

- electrical pressure (water pressure)

* Amperage


- electrical flow rate (gallons / min)

* Impedance


- restriction to electrical flow (pipe friction)

Fundamental of Electrical Hazards

Fundamental of Electrical Hazards

* 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

Fundamental of Electrical Hazards

Fundamental of Electrical Hazards

* What is grounding?



- Protection from electrical shock

normally a secondary protection measure

* A ground is a conductive connection




- between electrical circuit or equipment and earth and earth or ground plane.

- creates a low resistance to the earth.


Basis Rules of Electrical Action

Basis 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

Preventing Accidental Electrical Contact


Electrical safety Do's and Don's

Electrical safety Do's and Don's

- 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. 

Electrical safety Do's and Don's

Electrical safety Do's and Don's

- Do check the receptacles for missing or damaged parts.

- Do not plug equipment into defective receptacles.

- Do check for frayed, cracked or exposed wiring on equipment cords.

Electrical safety Do's and Don's

Electrical safety Do's and Don's

- Do check for defective cords clamps at locations where the power 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 person

Electrical safety Do's and Don's

Electrical safety Do's and Don's

- "cheater plugs" extension cords with junction box receptacle ends or other jury-rigged equipment should not be used. 

Electrical safety Do's and Don's

Electrical safety Do's and Don's

- Consumer electrical equipment or appliance should not be used if not properly grounded (Look for the UL label) 

Electrical safety Do's and Don's

Electrical safety Do's and Don's

- 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.

Electrical safety Do's and Don's

Electrical safety Do's and Don's

- Temporary or permanent storage of any materials must not be allowed within 3 feet of any electrical panel or electrical equipment.

- Any electrical equipment's causing or with high leakage potential must be tagged with a Danger tag or equivalent..  

Electrical safety Myths and Misconceptions

Electrical safety Myths and Misconceptions

- Electricity takes the path of least resistance.

- Electricity wants to go to ground.

- if an electrical tools falls on into a sink or tub of water , the item will short out.   

Electrical safety Myths and Misconceptions

Electrical safety Myths and Misconceptions

- 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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