Electrical maintenance hints.


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Electric Testing and Maintenance Lectures

Thermal burns including burns from heat generated by an electric arc, and flame burns from materials that catch on fire from heating or ignition by electrical currents or an electric arc flash. Contact burns from being shocked can burn internal tissues while leaving only very small injuries on the outside of the skin. Thermal burns from the heat radiated from an electric arc flash. Ultraviolet UV and infrared IR light emitted from the arc flash can also cause damage to the eyes.

An arc blast can include a potential pressure wave released from an arc flash. This wave can cause physical injuries, collapse your lungs, or create noise that can damage hearing. Muscle contractions, or a startle reaction, can cause a person to fall from a ladder, scaffold or aerial bucket. The fall can cause serious injuries. If you must be close to power lines, you must first call your electrical utility company and they will assist you.

Call and your local utility service for help.

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Wait for the electrical utility to come and they will tell you when it is safe to get out of your vehicle. Never try to rescue another person if you are not trained to do so.


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If you must leave the vehicle e. Never touch the vehicle or equipment and the ground at the same time. Keep your feet, legs, and arms close to your body.

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Keep your feet together touching , and move away by shuffling your feet. Never let your feet separate or you may be shocked or electrocuted. Shuffle at least 10 metres away from your vehicle before you take a normal step. Do not enter an electrical power substation, or other marked areas. Inspect portable cord-and-plug connected equipment, extension cords, power bars, and electrical fittings for damage or wear before each use.


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  • Repair or replace damaged equipment immediately. Always tape extension cords to walls or floors when necessary. Do not use nails and staples because they can damage extension cords and cause fire and shocks. Use extension cords or equipment that is rated for the level of amperage or wattage that you are using.

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    Always use the correct size fuse. Replacing a fuse with one of a larger size can cause excessive currents in the wiring and possibly start a fire. Be aware that unusually warm or hot outlets or cords may be a sign that unsafe wiring conditions exists. Unplug any cords or extension cords from these outlets and do not use until a qualified electrician has checked the wiring.

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    Always use ladders made with non-conductive side rails e. Place halogen lights away from combustible materials such as cloths or curtains. Halogen lamps can become very hot and may be a fire hazard.

    Risk of electric shock is greater in areas that are wet or damp. Install Ground Fault Circuit Interrupters GFCIs as they will interrupt the electrical circuit before a current sufficient to cause death or serious injury occurs. Make sure that exposed receptacle boxes are made of non-conductive materials. Know where the panel and circuit breakers are located in case of an emergency. Label all circuit breakers and fuse boxes clearly. Each switch should be positively identified as to which outlet or appliance it is for.

    Do not use outlets or cords that have exposed wiring. Do not use portable cord-and-plug connected power tools if the guards are removed. Do not block access to panels and circuit breakers or fuse boxes. Do not touch a person or electrical apparatus in the event of an electrical incident. Always disconnect the power source first.

    Switch all tools OFF before connecting them to a power supply. Disconnect and lockout the power supply before completing any maintenance work tasks or making adjustments. Ensure tools are properly grounded or double-insulated. The grounded equipment must have an approved 3-wire cord with a 3-prong plug.

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    This plug should be plugged in a properly grounded 3-pole outlet. Do not use electrical equipment in wet conditions or damp locations unless the equipment is connected to a GFCI. Do not clean tools with flammable or toxic solvents. Do not operate tools in an area containing explosive vapours or gases, unless they are intrinsically safe and only if you follow the manufacturer's guidelines.

    Keep power cords clear of tools during use. Suspend extension cords temporarily during use over aisles or work areas to eliminate stumbling or tripping hazards. Replace open front plugs with dead front plugs.


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    • Dead front plugs are sealed and present less danger of shock or short circuit. Do not use light duty extension cords in a non-residential situation. Do not carry or lift up electrical equipment by the power cord. Do not tie cords in tight knots. To see what your friends thought of this book, please sign up. Lists with This Book.

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