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Вы можете ознакомиться и скачать презентацию на тему Electrical safety. Доклад-сообщение содержит 25 слайдов. Презентации для любого класса можно скачать бесплатно. Если материал и наш сайт презентаций Mypresentation Вам понравились – поделитесь им с друзьями с помощью социальных кнопок и добавьте в закладки в своем браузере.

Слайды и текст этой презентации

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Flexible Products & Services: Electrical Safety Safety Awareness

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Introduction There are four main types of electrical injuries: Electrocution (death due to electrical shock) Electrical shock Burns Falls

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General Requirements for Electrical Equipment Examination – free from recognized hazards Installation – in accordance with labeling Marking – manufacturer’s name, voltage, current, wattage

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Training Requirements Applies to: Supervisors*, electricians, machine operators*, painters*, engineers*, and welders (*) Do not have to be trained if they do not work close to exposed parts Requirements depend on job tasks: PPE, installation, safe clearances, skills to distinguish exposed parts, determine voltage

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Electrical Terminology Current – the movement of electrical charge Resistance – opposition to current flow Voltage – a measure of electrical force Conductors – substances, such as metals, that have little resistance to electricity Insulators – substances, such as wood, rubber, glass, and bakelite, that have high resistance to electricity

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Working on or near exposed electrical parts Don’t work on or near exposed electrical parts unless: The part is de-energized The part is locked/tagged out

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Electrical Shock Received when current passes through the body Severity of the shock depends on: Path of current through the body Amount of current flowing through the body Length of time the body is in the circuit Low voltage does not mean low hazard

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Electrical Burns Most common shock-related, nonfatal injury Occurs when you touch electrical wiring or equipment that is improperly used or maintained Typically occurs on the hands Very serious injury that needs immediate attention

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

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Inadequate wiring hazard A hazard exists when a conductor is too small to safely carry the current Example: using a portable tool with an extension cord that has a wire too small for the tool The tool will draw more current than the cord can handle, causing overheating and a possible fire without tripping the circuit breaker The circuit breaker could be the right size for the circuit but not for the smaller-wire extension cord

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Overload hazards If too many devices are plugged into a circuit, the current will heat the wires to a very high temperature, which may cause a fire If the wire insulation melts, arcing may occur and cause a fire in the area where the overload exists, even inside a wall

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Electrical Protective Devices These devices shut off electricity flow in the event of an overload or ground-fault in the circuit Include fuses, circuit breakers, and ground-fault circuit-interrupters (GFCIs) Fuses and circuit breakers are overcurrent devices When there is too much current: Fuses melt Circuit breakers trip open

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Guarding of Live parts Must enclose or guard electric equipment in locations where it would be exposed to physical damage

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Cabinets, Boxes and Fittings Junction boxes, pull boxes and fittings must have approved covers Unused openings in cabinets, boxes and fittings must be closed (no missing knockouts)

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Thermal imaging

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Use of Flexible Cords More vulnerable than fixed wiring Flexible cords can be damaged by: Aging Door or window edges Staples or fastenings Abrasion from adjacent materials Activities in the area Improper use of flexible cords can cause shocks, burns or fire

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Permissible Uses of Flexible Cords - examples

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Prohibited Uses of Flexible cords - examples

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Procedures for using Portable Appliances Proper handling of cords Don’t raise or lower equipment by its cord Don’t unplug the equipment by pulling on its cord Don’t staple or fasten the cord so as to damage the outer jacket

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Procedures for using Portable Appliances Equipment inspection Visually check for: Loose parts Deformed or missing parts Damaged jackets or insulation

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Procedures for using Portable Appliances Equipment inspection Remove defective equipment from service Check the plug and receptacle mating configuration before connecting

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Procedures for using Portable Appliances Plugging/unplugging cord and cord-connected equipment and flexible cords Ensure hands are dry Never pull the plug out by the cord

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Use of Nonconductive Ladders Portable ladders must have nonconductive side rails when used near energized parts Metal ladders can conduct electricity and cause arcing and shocks

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

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Summary Hazards Inadequate wiring Exposed electrical parts Wires with bad insulation Ungrounded electrical systems and tools Overloaded circuits Damaged power tools and equipment Using the wrong PPE and tools Overhead power lines All hazards are made worse in wet conditions

Теги Electrical safety

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