toolbox talk on shock

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Arc Welding and V Construction Toolbox Talk NIOSH CPWR [● Electrical Safety Arc welding is safe if the unit is properly inspected and used. You can receive a shock, however, from the primary (input) voltage if you touch a lead or other electrically "hot" component inside the welder while touching the welder case or grounded metal. ## Marc's Story Marc was using an arc welder to install metal subflooring on a balcony at a construction site. He touched exposed wires on the welding cables and was electrocuted. Investigators found that earlier repairs to the welding cables had been done wrong, leaving them frayed and exposed. - What caused this incident? - How could this have been prevented? * Have you ever been injured while welding, or do you know someone who has? If so, what happened? ## Remember This Before starting: Inspect the arc welder. Look for frayed welding leads and damage to the cable insulation and welder. • Read all warning labels and instruction manuals. • Ground the welder case so that if a problem develops inside it, a fuse will blow and disconnect the power. • Insulate your body from the metal you are welding. ## While working: • Do not rest your body, arms, or legs on the metal being welded, especially if your clothing is wet or your skin is exposed. • Use mats of plywood, rubber, or some other dry insulation to stand or lie on. • Do not touch the electrode or metal parts of the electrode holder with bare skin or wet clothing. • Wear dry gloves in good condition when welding. • Avoid welding in wet or damp areas, to prevent electrical shock. • Always wear long sleeves and appropriate protective clothing, eye protection, gloves, and footwear to protect skin from burns due to ultraviolet light, sparks, and molten metal. ## How can we stay safe today? What will we do at the worksite to prevent injuries from electrical hazards while arc welding? C D C National Insund Health NIOSH CENTERS FOR DISEASE CONTROL AND PREVENTION OSHA S…

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# Hammer Safety (cont.) ## Remember This (cont.) CPWR TOOLBOX THE CENTER FOR CONSTRUCTION RESEARCH AND TRAINING TALK # Hammer Safety - Wear safety glasses to protect your eyes. - Make sure the hammer's handle IS NOT loose or damaged. - Use the right type of hammer for the job. ©2017, CPWR-The Center for Construction Research and Training. All rights reserved. CPWR is the research and training arm of NABTU. Production of this document was supported by cooperative agreement OH 009762 from the National Institute for Occupational Safety and Health (NIOSH). The contents are solely the responsibility of the authors and do not necessarily represent the official views of NIOSH. CPWR [O THE CENTER FOR CONSTRUCTION RESEARCH AND TRAINING

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Construction Electrical Safety: Wiring Toolbox Talk NIOSH CPWR 【 Electrical hazards are a leading cause of fatal injuries among construction workers. The main types of electri- cal injuries are electric shock, burns, falls caused by com- ing in contact with electrical energy, and electrocution. ## Ryan's Story Ryan and his supervisor were finishing the electrical wiring of an outdoor floodlight. Ryan began removing the insulation from a normal house-wiring unit, using an insulated wire stripper. His right thumb and right index finger contacted the non-insulated part of the wire stripper. The 110-volt circuit had not been shut off at the panel box. Ryan received an electrical shock and fell to the ground. The ambulance soon arrived, but he was dead upon arrival at the hospital. *What caused this incident? *How could this have been prevented? *Have you ever had an electrical shock, or do you know someone who has? If so, what happened? ## How can we stay safe today? What will we do at the worksite to prevent injury or electrocution from electrical wiring? ## Remember This - De-energize electrical circuits before doing any type of work on them. • Use lockout devices to prevent a circuit from becoming live. • Put a tag on the locked device, indicating that it should not be turned on. • Clearly identify the disconnected power source and circuits. - Use an AC voltage tester to verify that the electrical power is off. • Use insulated tools and gloves when working on electrical wires. OSHA Standards: 1926.416 and 1026.417 CD C National Intend Health NIOSH CENTERS FOR DISEASE CONTROL AND PREVENTION CPWR【O THE CENTER FOR CONSTRUCTION RESEARCH AND TRAINING

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# Head Protection (cont.) ## Remember This (cont.) CPWR TOOLBOX THE CENTER FOR CONSTRUCTION RESEARCH AND TRAINING TALK # Head Protection ✓ Correct Incorrect T * Never alter the hard hat shell or cushion-support suspension. - Always wear your hard hat with the bill facing forward. Certification by ANSI does not cover hard hats worn backwards. - Do not let your hard hat touch electrical wires. - Use only eye protection designed to work with hard hats. Be sure to follow the maker's instructions for use. ©2017, CPWR-The Center for Construction Research and Training. All rights reserved. CPWR is the research and training arm of NABTU. Production of this document was supported by cooperative agreement OH 009762 from the National Institute for Occupational Safety and Health (NIOSH). The contents are solely the responsibility of the authors and do not necessarily represent the official views of NIOSH. CPWR 【● THE CENTER FOR CONSTRUCTION RESEARCH AND TRAINING

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Electrical Safety: Construction Toolbox Talk Extension Cords NIOSH CPWR [● On construction sites, flexible extension cords for powering tools and equipment are everywhere. These cords are often loose and uncovered. They can cause tripping hazards. They also can be damaged easily and can create electrical hazards. An electric shock can result in an electrical burn or even heart failure and death. A shock that is strong enough to throw you away from the electrical source can result in other types of physical injuries. ## Bernard's Story Bernard was using a coring machine to make holes in a concrete floor. The 120-volt machine was powered by two extension cords connected together. One cord was missing its grounding prong. The cords were plugged into a permanent electrical outlet. Bernard placed the coring machine where he wanted to make the hole. When he turned on the power, Bernard received a shock and suffered an electrical burn to his hand. *What caused this incident? *How could this have been prevented? * Have you ever been injured due to an extension cord, or do you know someone who has? If so, what happened? ## Remember This • Inspect all extension cords before using for damage and missing grounding prongs. • Use a Ground Fault Circuit Interrupter to protect against any electrical fault. • Keep extension cords away from foot traffic to prevent tripping hazards and damage to the cords. The insulation in cords and electrical tools can become damaged. If a live wire touches exposed metal parts inside a tool, it can become energized. • Do not use extension cords/flexible wiring - Where frequent inspection would be difficult. - Where damage would be likely. - Where long-term electrical supply is necessary. An extension cord is not a substitute for fixed wiring. • Do not use a metal outlet box, Romex, or nonmetallic cable as an extension cord. • Do not use staples or nails to hold cords in place. • Do not use multiple cords connected together (use o…

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# Housekeeping (cont.) ## Remember This (cont.) CPWR TOOLBOX RESEARCH AND TRAINING THE CENTER FOR CONSTRUCTION TALK # Housekeeping - Keep all work areas, walkways, and stairs dry, clean, and clear of waste. Keep hoses, power cords, and welding leads out of heavily traveled walkways or areas. - Don't allow materials or garbage to build up. Remove unused materials. Continually clear out garbage and other wastes. ©2017, CPWR-The Center for Construction Research and Training. All rights reserved. CPWR is the research and training arm of NABTU. Production of this document was supported by cooperative agreement OH 009762 from the National Institute for Occupational Safety and Health (NIOSH). The contents are solely the responsibility of the authors and do not necessarily represent the official views of NIOSH. CPWR【O THE CENTER FOR CONSTRUCTION RESEARCH AND TRAINING

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Construction Electrical Safety: Power Toolbox Talk NIOSH CPWR 【 Working near or with electricity can be hazardous. A mistake around electricity could easily be your last. Even experienced electricians and electrical power installers must stay on guard. The main types of electrical injuries are electric shock, burns, falls caused by coming in contact with electrical energy, and electrocution. ## Vinny's Story Vinny and two co-workers were installing individual electrical units in an apartment building under construction. The circuit breaker protecting the main breaker box for the entire building had been labeled but not locked out. The crew began wiping down the individual units before a pre-startup inspection by the building department. They did not know that the utility workers had energized the internal circuit. As Vinny wiped down one of the units, his right hand contacted an electrical circuit and his left contacted a bar on the electrical circuit. This created a path for electrical current to flow. He died from electrocution. - What caused this incident? - How could this have been prevented? *Have you ever been electrically shocked and injured on the job, or do you know someone who has? If so, what happened? ## Remember This • Always make sure circuits are de-energized before doing any type of work on electrical circuits or around electricity, by testing with an AC voltage detector. - Always use lockout devices to prevent a circuit from becoming live. - Always put a tag on the locked electrical circuit to warn others that they should not turn it on. • Always be aware of equipment marked high-voltage, which can store lethal energy even when disconnected from the power source. ## How can we stay safe today? What will we do at the worksite to prevent injuries or deaths from electrical power? OSHA Standards: 1926.416 and 1026.417 National Insund Health CDC NIOSH CENTERS FOR DISEASE CONTROL AND PREVENTION CPWR ● THE CENTER FOR CONSTRUCTION RESEA…