ELETRICAL SAFETY

Views:
 
Category: Entertainment
     
 

Presentation Description

No description available.

Comments

Presentation Transcript

WELCOME:

1 WELCOME

Electrical Safety - Construction:

Electrical Safety - Construction

Electricity:

Electricity The main advantage of electrical energy is that it can be transported over large distances to our homes. Wires carry electricity from power stations to our homes/schools/offices.

Electrical Injuries:

Electrical Injuries There are four main types of electrical injuries: Direct: Electrocution or death due to electrical shock Electrical shock Burns Indirect - Falls

Electrical Shock:

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.

Shock Severity:

Shock Severity Severity of the shock depends on: Path of current through the body Amount of current flowing through the body (amps) Duration of the shocking current through the body , LOW VOLTAGE DOES NOT MEAN LOW HAZARD

A complete circuit :

A complete circuit complete Circuit or loop is necessary for current to flow Current takes the path of least resistance

Causes of Electrocution Fatalities:

Causes of Electrocution Fatalities Contact with Overhead Power lines Contact with Live Circuits Not following Lock/Tag out procedures Poorly Maintained Extension Cords Defective Power Tools

Falls:

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

Electrical Hazards and How to Control Them:

Electrical Hazards and How to Control Them Electrical accidents are caused by a combination of three factors: Unsafe equipment and/or installation, Workplaces made unsafe by the environment, and Unsafe work practices.

Hazard – Exposed Electrical Parts:

Hazard – Exposed Electrical Parts Cover removed from wiring or breaker box

Control – Isolate Electrical Parts:

Control – Isolate Electrical Parts Use guards or barriers Replace covers Guard live parts of electric equipment operating at 50 volts or more against accidental contact

Control – Close Openings:

Control – Close Openings Junction boxes Unused openings in cabinets, boxes and fittings)

Hazard - Overhead Power Lines:

Hazard - Overhead Power Lines Usually not insulated Examples of equipment that can contact power lines: Crane Ladder Scaffold Backhoe Scissors lift Raised dump truck bed Aluminum paint roller

Control - Overhead Power Lines:

Control - Overhead Power Lines Stay at least 10 feet away Post warning signs Assume that lines are energized Use wood or fiberglass ladders, not metal Power line workers need special training & PPE

Hazard – Defective Cords & Wires:

Hazard – Defective Cords & Wires Plastic or rubber covering is missing Damaged extension cords & tools

Grounding:

Grounding Grounding creates a low-resistance path from a tool to the earth to disperse unwanted current. When a short or lightning occurs, energy flows to the ground, protecting you from electrical shock, injury and death.

Hazard – Improper Grounding:

Hazard – Improper Grounding Tools plugged into improperly grounded circuits may become energized Broken wire or plug on extension cord Some of the most frequently violated OSHA standards

Control – Use GFCI (ground-fault circuit interrupter):

Control – Use GFCI (ground-fault circuit interrupter) Protects you from shock Detects difference in current between the black and white wires If ground fault detected, GFCI shuts off electricity in 1/40 th of a second Use GFCI’s on all 120-volt, single-phase, 15- and 20-ampere receptacles, or have an assured equipment grounding conductor program .

Hazard – Overloaded Circuits:

Hazard – Overloaded Circuits Hazards may result from: Too many devices plugged into a circuit, causing heated wires and possibly a fire Damaged tools overheating Lack of over current protection Wire insulation melting, which may cause arcing and a fire in the area where the overload exists, even inside a wall

Control - Electrical Protective Devices:

Control - Electrical Protective Devices Automatically opens circuit if excess current from overload or ground-fault is detected – shutting off electricity Includes GFCI’s, fuses, and circuit breakers Fuses and circuit breakers are overcurrent devices. When too much current: Fuses melt Circuit breakers trip open

Power Tool Requirements:

Power Tool Requirements Have a three-wire cord with ground plugged into a grounded receptacle, or Be double insulated, or Be powered by a low-voltage isolation transformer

Temporary Lights:

Temporary Lights Protect from contact and damage, and don’t suspend by cords unless designed to do so.

WHEN YOU HANDLE TALL OBJECTS, LOOK UP, AND SEE WHETHER THERE ARE POWER LINES:

WHEN YOU HANDLE TALL OBJECTS, LOOK UP, AND SEE WHETHER THERE ARE POWER LINES

WHILE MOVING TALL 4-LEGGED LADDERS ENSURE THE SENCE OF POWER LINES ON THE WAY:

WHILE MOVING TALL 4-LEGGED LADDERS ENSURE THE SENCE OF POWER LINES ON THE WAY

Clues that Electrical Hazards Exist :

Clues that Electrical Hazards Exist Tripped circuit breakers or blown fuses Warm tools, wires, cords, connections, or junction boxes GFCI that shuts off a circuit Worn or frayed insulation around wire or connection

Lockout and Tagging of Circuits:

Lockout and Tagging of Circuits Apply locks to power source after de-energizing Tag deactivated controls Tag de-energized equipment and circuits at all points where they can be energized Tags must identify equipment or circuits being worked on

Safety-Related Work Practices:

Safety-Related Work Practices To protect workers from electrical shock: Use barriers and guards to prevent passage through areas of exposed energized equipment Pre-plan work, post hazard warnings and use protective measures Keep working spaces and walkways clear of cords

Preventing Electrical Hazards - Planning:

Preventing Electrical Hazards - Planning Plan your work with others Plan to avoid falls Plan to lock-out and tag-out equipment Remove jewelry Avoid wet conditions and overhead power lines

Avoid Wet Conditions:

Avoid Wet Conditions If you touch a live wire or other electrical component while standing in even a small puddle of water you’ll get a shock. Damaged insulation, equipment, or tools can expose you to live electrical parts. Improperly grounded metal switch plates & ceiling lights are especially hazardous in wet conditions. Wet clothing, high humidity, and perspiration increase your chances of being electrocuted. 30

PowerPoint Presentation:

Always remember… It’s your life !

Summary:

Summary Awareness of the need for electrical safety Introduction to the source of electrical dangers Your responsibility to take care of yourself and others

THANK YOU:

THANK YOU

authorStream Live Help