Write a toolbox talk on Electrical wire stripping

Source excerpt

# Hazard assessment worksheet: Leg protection (cont.) ## PPE required (cont.) OSHA Oregon OSHA Department of Consumer and Business Services # Hazard assessment worksheet: Hand protection Salem Central Office [redacted street address]. NE Salem, OR [redacted postal code] Phone: [redacted phone] Toll-free: [redacted phone] osha.oregon.gov Work task: Date ## Potential hazards - No hazards requiring hand protection - Harmful or hazardous temperatures - Chemicals that can be absorbed into the skin or cause burns - Energized electrical equipment - Mechanical equipment that can cause bruises, abrasions, cuts, punctures, fractures, or amputations Other hazard: ## PPE required None required - Cut resistant gloves General-purpose work gloves Chemical resistant gloves ............... Insulated gloves Heat and flame resistant gloves Latex or nitrile gloves Electrician's insulated rubber gloves Cotton, leather, or anti-vibration gloves Other PPE: 440-5871 (07/23/COM)

Source excerpt

# HAZARDS: SAFE WORK ENVIRONMENT t about 1:45 a.m., two journeyman electricians began replacing bulbs and making repairs on light fixtures in a spray paint booth at an automobile assembly plant. The job required the two pipes and ducts that restricted visibility and movement. Flashlights were required. The electricians started at opposite ends of the booth. One electrician saw a flash of light, but continued to work for about 5 minutes, then climbed down for some wire. While cutting the wire, he smelled a burn- ing odor and called to the other electrician. When no one answered, he climbed back on top of the booth. He found his co-worker in contact with a single-strand wire from one of the lights. Needle-nose wire strip- pers were stuck in the left side of the victim's chest. Apparently, he had been stripping insulation from an improperly grounded 530-volt, single-strand wire when he contacted it with the stripper. In this case, the electricians knew they were working on energized circuits. The breakers in the booth's control panel were not labeled and the lock used for lock-out/tag-out was broken. The surviving electrician stated that locat- ing the means to de-energize a circuit often takes more time than the actual job. The electrician would be alive today if the following rules had been observed. • Always shut off circuits—then test to confirm that they are de-energized-before starting a job. • Switchgear that shuts off a circuit must be clearly labeled and easy to access. - Lock-out/tag-out materials must always be provided, and lock-out/tag-out procedures must always be followed. ## Lock out and tag out circuits and equipment Create a safe work environment by locking out and tagging out circuits and machines. Before working on a circuit, you must turn off the power supply. Once the circuit has been shut off and de-energized, lock out the switchgear to the circuit so the power cannot be turned back on inadvertently. Then, tag out the circuit with an easy…

Source excerpt

# -RECOGNIZING HAZARDS (cont.) SAFETY MODEL STAGE 1 ■ wire gauge-wire size or diameter (technically, the cross-sectional area) ■ampacity—the maximum amount of current a wire can carry safely without overheating ■ Overloaded wires get hot! ■Incorrect wiring practices can cause fires! ## Inadequate wiring hazards An electrical hazard exists when the wire is too small a gauge for the current it will carry. Normally, the circuit breaker in a circuit is matched to the wire size. However, in older wiring, branch lines to permanent ceiling light fixtures could be wired with a smaller gauge than the supply cable. Let's say a light fixture is replaced with another device that uses more current. The current capacity (ampacity) of the branch wire could be exceeded. When a wire is too small for the cur- rent it is supposed to carry, the wire will heat up. The heated wire could cause a fire. Section 5 When you use an extension cord, the size of the wire you are plac- ing into the circuit may be too small for the equipment. The circuit breaker could be the right size for the circuit but not right for the smaller-gauge extension cord. A tool plugged into the extension cord may use more current than the cord can handle without tripping the circuit breaker. The wire will overheat and could cause a fire. The kind of metal used as a conductor can cause an electrical hazard. Special care needs to be taken with aluminum wire. Since it is more brittle than copper, aluminum wire can crack and break more easily. Connections with aluminum wire can become loose and oxidize if not made properly, creating heat or arcing. You need to recognize that inade- quate wiring is a hazard. ## Exposed electrical parts hazards Electrical hazards exist when wires or other electrical parts are exposed. Wires and parts can be exposed if a cover is removed from a wiring or breaker box. The overhead wires coming into a home may be exposed. Electrical ■If you touch live electrical parts, you will…

Source excerpt

# Synthetic amorphous silica insulation ## Explain dangers Synthetic amorphous silica insulation (SASI) is a thermal insulating material used in some building and manufacturing applications. SASI blankets are often used as an insulating material to cover pipes. The dust produced from handling or cutting this material can cause the following health effects: - Skin dryness • Irritation of the eyes, skin and respiratory tract. ## Identify controls ## HOW TO PREVENT EXPOSURE Use the following precautions when handling or cutting SASI blankets: • Keep the SASI blanket sealed and unopened until it is ready for use. - Use yellow tape to cordon off the work area and post warning signs that personal protective equipment (PPE) must be worn in the work area. - Wear all PPE recommended by the manufacturer. ## PERSONAL PROTECTIVE EQUIPMENT ## Respiratory protection Full-facemask air-purifying respirator equipped with a P100 filter. ## Eye protection Goggles or equivalent ## Clothing Impermeable disposable coveralls that are tight-fitting at the wrists, ankles, and face (i.e., it must have a hood). ## Hand protection Impermeable gloves with cuffs overlapped and taped at the wrists. If cutting, use cut-resistant gloves with impermeable gloves underneath. ## CUTTING APPLICATIONS • Use hand tools to cut blankets whenever possible. Power tools create more dust. • If power tools are used, make sure they are equipped with a HEPA filter. Otherwise, use a local exhaust ventilation system to capture dust at the source. • Designated cutting areas or cutting shacks should be used for high-volume cutting. - For prolonged periods of cutting, the work area should be fully enclosed. The enclosure should have installed a mechanical ventilation system equipped with a HEPA filter to keep the work area under negative pressure. ## CLEAN-UP AND DISPOSAL . Dispose of SASI waste in plastic bags upon removal. • After exiting the insulation work area, put all disposable …

Source excerpt

# INDEX A aluminum wire hazard 24 amp 6 ampacity 24 ampere 6 arc-blast 12 arc-fault circuit breaker 46 arcing 12, 29 arthritis 30 AWG 39 ## B bonding 49 bonding jumper 50 burns, arc 12, 15 burns, electrical 6, 10, 12, 15 burns, thermal contact 12, 15 C cable, 240v 4 cardiopulmonary resuscitation 17 carpal tunnel syndrome 31 circuit 2 circuit breaker 29, 34, 50 circuit breaker, and leakage current 28 clearance distance 26 clues of electrical hazards 34 clues, blown fuses 34 tripped circuit breakers 34 tripped GFCI 35 warm extension cord 34 warm junction box 35 warm tools and wire 34 worn insulation 35 Code of Federal Regulations 75 concussion 12 conductor 3 controlling hazards 19, 21, 36, 54 CPR (see cardiopulmonary resuscitation) CFR (see Code of Federal Regulations) current, calculating 42 current 2 effects on body 7 path through body 8, 9, 10 current leakage 47 cuts 31 D 76 de-energizing circuits 55 E electrical hazards, aluminum wire 24 damaged hand tool 31, 34 damaged tool 29 defective insulation 26 exposed electrical parts 24 improper grounding 27 inadequate wiring 24 overhead powerline 25 overload 28 wet conditions 29 electrical shock, amount 6, 11 current density 9 duration 6, 7, 11 path 8, 9, 10, 11 receiving 2 electrical shock-what to do for 16 electrocution, deaths 1, 7, 10 energized 2 evaluating hazards 19, 21, 34 evaluating risk 34 extension cord 24, 34, 42, 46, 63 F falls 56 fault 27 fault, low current 47 fire extinguisher, types 14 fires, electrical 14, 24, 28, 29 fires what to do 14 fixed wiring 40 flexible wiring 41 foot protection 70 freezing 6 fuse 29, 34, 51 G Page GFCI (see ground fault circuit interrupter) ground 2 ground connection 47 ground fault 28 ground fault circuit interrupter 28, 34, 48, 61 ground potential 27 grounding 27, 28, 46 grounding path 47 guarding 43 H hard hat 68 hazards (also see electrical hazards), chemical 30 control (see controlling hazards) falling objects 32 falls 32 inadequate wiring 24 lifting 32 ove…

Source excerpt

# Hazard assessment worksheet: Torso protection (cont.) ## PPE required (cont.) OSHA Oregon OSHA Department of Consumer and Business Services # Hazard assessment worksheet: Eye and face protection Salem Central Office [redacted street address]. NE Salem, OR [redacted postal code] Phone: [redacted phone] Toll-free: [redacted phone] osha.oregon.gov Work task: Date ## Potential hazards - No hazards requiring eye and face protection - Dust, dirt, metal, or wood chips from chipping, grinding, sawing, hammering, and from power tools - Chemical splashes from corrosive substances, hot liquids, and solvents - Objects such as tree limbs, chains, tools, and ropes that swing into the eyes or face - Radiant energy from welding and harmful rays from lasers or other radiant light - Other hazard: ## PPE required - None required - Chemical goggles Face shield - Chemical splash goggles Glasses or goggles with face shield Impact goggles Welding hood Welding helmet Safety glasses with side shields ............... Safety goggles with face shield Welding goggles Other PPE: 440-5871 (07/23/COM)

Source excerpt

# Section 1 (cont.) ## How Is an Electrical Shock Received? (cont.) ELECTRICITY You can even receive a shock when you are not in contact with an electrical ground. Contact with both live wires of a 240-volt cable will deliver a shock. (This type of shock can occur because one live wire may be at +120 volts while the other is at -120 volts during an alternating current cycle-a difference of 240 volts.). You can also receive a shock from electrical components that are not grounded properly. Even contact with another person who is receiving an elec- trical shock may cause you to be shocked. 30-year-old male electrical technician was helping a company service representative test the volt- A age-regulating unit on a new rolling mill. While the electrical technician went to get the equipment trol cabinet in preparation to trace the low-voltage wiring in question (the wiring was not color-coded). The service representative climbed onto a nearby cabinet in order to view the wires. The technician returned and began working inside the control cabinet, near exposed energized electrical conductors. The techni- cian tugged at the low-voltage wires while the service representative tried to identify them from above. Suddenly, the representative heard the victim making a gurgling sound and looked down to see the victim shaking as though he were being shocked. Cardiopulmonary resuscitation (CPR) was administered to the victim about 10 minutes later. He was pronounced dead almost 2 hours later as a result of his contact with an energized electrical conductor. To prevent an incident like this, employers should take the following steps: • Establish proper rules and procedures on how to access electrical control cabinets without getting hurt. • Make sure all employees know the importance of de-energizing (shutting off) electrical systems before performing repairs. - Equip voltage-regulating equipment with color-coded wiring. • Train workers in CPR. A maintenance man rode 12 …

Source excerpt

# ―RECOGNIZING HAZARDS Extension cords may have damaged insulation. Sometimes the insu- lation inside an electrical tool or appliance is damaged. When insula- tion is damaged, exposed metal parts may become energized if a live wire inside touches them. Electric hand tools that are old, damaged, or misused may have damaged insulation inside. If you touch damaged power tools or other equipment, you will receive a shock. You are more likely to receive a shock if the tool is not grounded or double- insulated. (Double-insulated tools have two insulation barri- ers and no exposed metal parts.) You need to recognize that defective insulation is a hazard. This extension cord is damaged and should not be used. ## Improper grounding hazards When an electrical system is not grounded properly, a hazard exists. The most common OSHA electrical violation is improper grounding of equipment and circuitry. The metal parts of an electrical wiring system that we touch (switch plates, ceiling light fixtures, conduit, etc.) should be grounded and at 0 volts. If the system is not grounded properly, these parts may become energized. Metal parts of motors, appliances, or electronics that are plugged into improperly grounded circuits may be energized. When a circuit is not grounded properly, a hazard exists because unwanted voltage cannot be safely eliminated. If there is no safe path to ground for fault currents, exposed metal parts in damaged appliances can become energized. Extension cords may not provide a continuous path to ground because of a broken ground wire or plug. If you contact a defective ■If you touch a damaged live power tool, you will be shocked! ■ A damaged live power tool that is not grounded or double-insulated is very dangerous! ■fault current-any current that is not in its intended path ■ ground potential-the voltage a grounded part should have; 0 volts relative to ground Section 5 Page 27

Source excerpt

# SAFETY MODEL STAGE 3-CONTROLLING A 22-year-old male carpenter was building the wooden framework of a laundry building. He was using portable power tools. Electricity was supplied to the tools by a temporary service pole 50 feet away. carpenter plugged a "homemade" cord into the service pole and then plugged a UL-approved cord into the homemade cord. His power saw was plugged into the UL-approved cord. The site was wet. Humidity was high and the carpenter was sweating. Reportedly, he was mildly shocked throughout the morning and replaced the extension cord he was using in an effort to stop the shocks. At one point, as he was climbing down a makeshift ladder constructed from a floor truss, he shifted the power saw from his right hand to his left hand and was shocked. He fell from the ladder into a puddle of water, still hold- ing the saw. The current had caused his hand to contract, and he was "locked" to the saw. A co-worker disconnected the power cord to the saw. CPR was given, but the shock was fatal. Attention to these general safety principles could have prevented this death. - Any and all electrical equipment involved in a malfunction should be taken out of service immediately. The carpenter should have taken the saw out of service, not just the extension cord. (As it turns out, the saw was the source of the shocks, not the cord.) • Although the homemade extension cord does not seem to have contributed to this incident, it should not have been used. - The floor truss should not have been used as a ladder. For climbing, use only approved ladders or other equipment designed specifically for climbing. • Do not work in wet areas. The water should have been removed from the floor as soon as it was found. Humidity and perspiration can also be hazards. Try to stay as dry as possible, be alert, and take action to protect yourself when needed. - OSHA requires that all receptacles at construction sites that are not part of the permanent wiring have GFCI's. …

Source excerpt

# HAZARDS: SAFE WORK PRACTICES Wear safety glasses-Wear safety glasses to avoid eye injury. Wear safety glasses to avoid eye injury. - Wear proper clothing-Wear clothing that is neither floppy nor too tight. Loose clothing will catch on corners and rough sur- faces. Clothing that binds is uncomfortable and distracting. □ Contain and secure loose hair-Wear your hair in such a way that it does not interfere with your work or safety. - Wear proper foot protection-Wear shoes or boots that have been approved for electrical work. (Tennis shoes will not protect you from electrical hazards.) If there are non-electrical hazards present (nails on the floor, heavy objects, etc.), use footwear that is approved to protect against these hazards as well. - Wear a hard hat-Wear a hard hat to protect your head from bumps and falling objects. Hard hats must be worn with the bill forward to protect you properly. - Wear hearing protectors-Wear hearing protectors in noisy areas to prevent hearing loss. - Follow directions-Follow the manufacturer's directions for clean- ing and maintaining PPE. - Make an effort-Search out and use any and all equipment that will protect you from shocks and other injuries. Don't wear hard hats backwards! Arcing electrical burns through the victim's shoe and around the rubber sole. ■Think about what you are doing. ■ PPE is only effective when used correctly. Section 8 Page 67

Source excerpt

# HAZARDS: SAFE WORK PRACTICES n employee was climbing a metal ladder to hand an electric drill to the journeyman installer on a scaffold about 5 feet above him. When the victim reached the third rung of the ladder, he A a scaffold 5 feet above him. When the the that the grounding prong was missing from the extension cord attached to the drill. Also, the cord's green grounding wire was, at times, contacting the energized black wire. Because of this contact with the "hot" wire, the entire length of the grounding wire and the drill's frame became energized. The drill I was not double-insulated. To avoid deadly incidents like this one, take these precautions: • Make certain that approved GFCI's or equipment grounding systems are used at construction sites. - Use equipment that provides a permanent and continuous path to ground. Any fault current will be safely diverted along this path. • Inspect electrical tools and equipment daily and remove damaged or defective equipment from use right away. - Use the right tool correctly-Use tools correctly and for their intended purposes. Follow the safety instructions and operating procedures recommended by the manufacturer. When working on a circuit, use approved tools with insulated handles. However, DO NOT USE THESE TOOLS TO WORK ON ENERGIZED CIRCUITS. ALWAYS SHUT OFF AND DE-ENERGIZE CIRCUITS BEFORE BEGINNING WORK ON THEM. - Protect your tools-Keep tools and cords away from heat, oil, and sharp objects. These hazards can damage insulation. If a tool or cord heats up, stop using it! Report the condition to a supervi- sor or instructor immediately. If equipment has been repaired, make sure that it has been tested and certified as safe before using it. Never carry a tool by the cord. Disconnect cords by pulling the plug-not the cord! - Use double-insulated tools-Portable electrical tools are classi- fied by the number of insulation barriers between the electrical conductors in the tool and the worker. The NEC perm…