Basic Electrical Safety at Construction Project

archdevil

Royal Member
Sep 21, 2017
374
658
India
Objective of this presentation

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.

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

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.

Presentation files are attached below.
 

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