* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Electrical shock
Flexible electronics wikipedia , lookup
Current source wikipedia , lookup
Electric machine wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
Opto-isolator wikipedia , lookup
Mechanical filter wikipedia , lookup
Electrification wikipedia , lookup
Telecommunications engineering wikipedia , lookup
Voltage optimisation wikipedia , lookup
Power engineering wikipedia , lookup
Electronic engineering wikipedia , lookup
Mechanical-electrical analogies wikipedia , lookup
Ground loop (electricity) wikipedia , lookup
Electrical substation wikipedia , lookup
Surge protector wikipedia , lookup
History of electric power transmission wikipedia , lookup
Electromagnetic compatibility wikipedia , lookup
Alternating current wikipedia , lookup
History of electromagnetic theory wikipedia , lookup
Electrical engineering wikipedia , lookup
Portable appliance testing wikipedia , lookup
Mains electricity wikipedia , lookup
Stray voltage wikipedia , lookup
Electrical wiring wikipedia , lookup
Earthing system wikipedia , lookup
Ground (electricity) wikipedia , lookup
Electrician wikipedia , lookup
FHM TRAINING TOOLS This training presentation is part of FHM’s commitment to creating and keeping safe ►►► workplaces. Be sure to check out all the training programs that are specific to your industry. These materials have been developed based on applicable federal laws and regulations in place at the time the materials were created. The program is being provided for educational and informational purposes only and does not constitute and is not intended to provide OSHA compliance certification, regulatory compliance, a substitute for any "hands on“ training required by applicable laws and regulations, or other legal or professional advice or services. By accessing the materials, you assume all responsibility and risk arising from the use of the content contained therein. ©2010 Grainger Safety Services, Inc. Electrical Safe Work Practices for Unqualified Workers ►►► These materials have been developed based on applicable federal laws and regulations in place at the time the materials were created. The program is being provided for educational and informational purposes only and does not constitute and is not intended to provide OSHA compliance certification, regulatory compliance, a substitute for any "hands on“ training required by applicable laws and regulations, or other legal or professional advice or services. By accessing the materials, you assume all responsibility and risk arising from the use of the content contained therein. ©2010 Grainger Safety Services, Inc. Learning Objectives Objectives: ► Be familiar with the information required by the OSHA’s standard for Electrical Safety-Related Work Practices, Code of Federal Regulations as Title 29 Part 1910.332 ► Possess information necessary to work safely with, on, or near electrically-powered equipment Agenda Presentation agenda: ► Overview ► Basics of electricity ► Hazards of electricity ► Safe work practices ► Your responsibilities ►Section 1 Overview Electrical Safety Electricity facts: ► Electrical generation is less than 150 years old ► Average of one worker electrocution daily ► Major cause of home fires Electrical Safety OSHA standards: ► Requires safe work practices and protective equipment when electric hazards are present person – familiar with electrical equipment and its hazards ► Qualified ► Covers daily use of electrically-powered equipment Employee Training OSHA requirements: ► Qualified employees may work on energized systems ► Required training: – Distinguishing exposed live parts – Determining nominal voltage – OSHA specified clearance distances ►Section 2 The Basics of Electricity Electrical Terminology Basic terms: ► Current ► Circuit – the movement of electrical charge – the flow of electrical charge ► Resistance ► Voltage – opposition to current flow – measure of electrical force Electrical Terminology More terms: – substances with little electrical resistance ► Conductors – substances with high electrical resistance ► Insulators ► Grounding to the earth – conductive connection Basics of Electricity The basics: ► Electricity is the flow of electrons through a conductor ► Current is the flow and measured in amps ► Current only flows within a complete circuit ► Current flows due to voltage ► DC is constant voltage ► AC is alternating current ►Section 3 The Hazards of Electricity Injuries Related to Electricity Main types of injuries: – death due to electrical shock ► Electrocution ► Electrical ► Burns shock – non-fatal shocks – most common – from muscle spasms due to shocks ► Falls Electrical Shock Facts on shocks: ► Occur when a part of the body comes in contact with an electrical circuit ► Small currents and low voltages can still be fatal ► Severity of shock depends on: – Path through the body – Amount of current – Length of time in circuit ►Section 4 Safe Work Practices Electrical Safe Work Practices Categories of practices: ► Grounding ► Electrical protective devices ► Guarding energized parts ► Proper use of cords ► Maintaining ► Clothing distances and jewelry Proper Grounding Grounding is a physical connection to the earth: ► Grounding paths must be permanent and continuous or System Ground – primarily designed to protect machines and tools against damage ► Service Ground – provides a path from the tool or machine for current to flow to the ground ► Equipment Proper Grounding Hand-held tools must be: ► Equipped with three-wire cord with ground ► Plugged into a grounded receptacle ► Double-insulated ► Powered by a low-voltage isolation transformer Electrical Protective Devices Types of protective devices: – will be destroyed before considerable damage can be dealt ► Fuses breakers – a set of contacts opens the circuit ► Circuit ► Ground-fault circuit-interrupters Electrical Protective Devices Ground-fault circuit-interrupter (GFCI): ► Detect leakage currents ► Matches current going to a device against current returning down within 1/40th of a second when fault is detected ► Shuts ► Able to detect loss of current due to a person who is being shocked Guarding Energized Parts Equipment operating at 50 volts or more should be isolated by: ► Protective cabinet or enclosure ► Permanent ► Elevation ► Must partitions above working surface be conspicuously marked Guarding Energized Parts All wiring needs to be protected: ► Junction boxes, outlet boxes, switches and fittings must have approved covers ► Unused ► Wiring openings must be closed needs to be intact and shielded Flexible (extension) Cords Causes of cord damage: ► Aging ► Door or window edges ► Staples or fastenings ► Abrasions ► Activities in the area Flexible (extension) Cords Cords may not be used: ► As a substitute for fixed wiring ► Where run through holes in walls, ceilings or floors ► Where run through doorways or windows ► Where attached to building surfaces ► Where concealed behind walls, ceilings, or floors Maintaining Distances Maintaining distances is a necessity: ► Overhead power lines are not insulated ► Unqualified workers are required to maintain at least 10 foot clearance ► Fallen overhead wires should never be touched ► Ladders should not be used near power lines Clothing and Jewelry Conductive clothing and jewelry: ► Watch bands ► Bracelets ► Rings ► Key chains ► Necklaces ► Metalized aprons ► Cloth with conductive thread ► Metal headgear Clues that Electrical Hazards Exist Clues: ► Tripped circuit breakers ► Blown fuses ► Warm wiring ► GFCI shuts down the circuit ► Damaged ► Wiring insulation pulling loose ►Module 5 Your Responsibilities Your Responsibilities Your responsibilities include: ► De-energizing ► Maintain ► Be equipment before inspecting and inspect electrical tools aware of your surroundings ► Inspect and properly use extension cords ► Wear personal protective equipment when necessary ► Maintain 10 foot clearance from overhead power lines