please make sure the grammar is correct-be able to rotate the pipe the welder laid the welding cable over the railing with the stinger on the outside of the railing and next to a sprinkler head. As the welder reached up to rotate the pipe, the stinger arced against the head and caused a hole in the sprinkler pipe, which in turn caused a water leak from the pipe.

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## While working: (cont.) Construction Toolbox Talk Arc Welding and Fire Safety NIOSH CPWR 【● DANGER FLAMMABLE At least 35 feet away from welding work area - Inspect the arc welder before starting any operation. Ground the welder case. - Remove all potential fire hazards from the welding area, for at least 35 feet. - Have the proper class of fire extinguisher (employer provided) nearby, ready for use. For most welding, use a combination fire extinguisher (Class A, B, C). - For magnesium fires, use a Class D fire extinguisher or cover the fire with sand or magnesium foundry flux. GET INFORMATION CDC/NIOSH INFO: 1-800-CDC-INFO (1-[redacted phone]) | TTY: 1-[redacted phone] | cdc.gov/info | cdc.gov/niosh CPWR: Contact [redacted phone] | [redacted email] | www.cpwr.com/toolbox-talks DHHS (NIOSH) Publication No. 2022-137 | DOI: https://doi.org/10.[redacted postal code]/NIOSHPUB2022137 | August 2022

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# Occupational Safety and Health Administration (cont.) 1910.159(c)(1) # Design. - 1910.159(c)(1)(i) All automatic sprinkler designs used to comply with this standard shall provide the necessary discharge patterns, densities, and water flow characteristics for complete coverage in a particular workplace or zoned subdivision of the workplace. - 1910.159(c)(1)(ii) The employer shall assure that only approved equipment and devices are used in the design and installation of automatic sprinkler systems used to comply with this standard. - 1910.159(c)(2) Maintenance. The employer shall properly maintain an automatic sprinkler system installed to comply with this section. The employer shall assure that a main drain flow test is performed on each system annually. The inspector's test valve shall be opened at least every two years to assure that the sprinkler system operates properly. - 1910.159(c)(3) Acceptance tests. The employer shall conduct proper acceptance tests on sprinkler systems installed for employee protection after January 1, 1981, and record the dates of such tests. Proper acceptance tests include the following: - 1910.159(c)(3)(i) Flushing of underground connections; 1910.159(c)(3)(ii) Hydrostatic tests of piping in system; 1910.159(c)(3)(iii) Air tests in dry-pipe systems; - 1910.159(c)(3)(iv) - Dry-pipe valve operation; and - 1910.159(c)(3)(v) - Test of drainage facilities. Submit Feedback

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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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Construction Toolbox Talk Arc Welding and Fire Safety NIOSH CPWR [● If properly inspected and used, the arc welder is safe. If used improperly, it can expose welders to fire, explosion, and burns to the retina (lining of the eye). ## Ben's Story Ben was welding angle iron supports to a steel joist. There were magnesium shavings and cuttings on the ground in his work area. Welding sparks and slag from the welding landed in the shavings, causing a violent fire that engulfed Ben. He died from severe burns, fire and smoke inhalation, and lack of oxygen. - What caused this incident? *How could this have been prevented? *Have you ever been injured while welding, or do you know someone who was injured or killed while welding? If so, what happened? ## Remember This Before starting work: • Inspect the arc welder. • Read all warning labels and instruction manuals for the welder. ## How can we stay safe today? What will we do at the worksite to prevent injuries from arc welding and fire hazards? • Insulate your body from the metal you are welding. • Ground the welder case. CD C National Insund Health NIOSH CENTERS FOR DISEASE CONTROL AND PREVENTION • Avoid fire hazards such as oil, grease, and flammables. • Remove all potential fire hazards from the welding area, for at least 35 feet. ## While working: • Wear dry gloves in good condition and the right footwear and clothes (long sleeves and pants) to protect from hot sparks, molten metal, and slag. • Do not strike an arc without putting on proper eye protection. • Have the proper class of fire extinguisher (employer provided) nearby, ready for use. - For most welding, it is best to use a combination fire extinguisher (Class A, B, C). - For magnesium fires, use a Class D fire extinguisher or cover the fire with sand or magnesium foundry flux. • Have a designated fire watcher when you weld or cut in areas where major fires can develop (such as combustible materials or materials closer than 35 feet to …

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# Occupational Safety and Health Administration (cont.) ## 1926.351(b) (cont.) duty cycle under which the arc welder or cutter is working. ## 1926.351(b)(2) Only cable free from repair or splices for a minimum distance of 10 feet from the cable end to which the electrode holder is connected shall be used, except that cables with standard insulated connectors or with splices whose insulating quality is equal to that of the cable are permitted. ## 1926.351(b)(3) When it becomes necessary to connect or splice lengths of cable one to another, substantial insulated connectors of a capacity at least equivalent to that of the cable shall be used. If connections are effected by means of cable lugs, they shall be securely fastened together to give good electrical contact, and the exposed metal parts of the lugs shall be completely insulated. ## 1926.351(b)(4) Cables in need of repair shall not be used. When a cable, other than the cable lead referred to in paragraph (b)(2) of this section, becomes worn to the extent of exposing bare conductors, the portion thus exposed shall be protected by means of rubber and friction tape or other equivalent insulation. ## 1926.351(c) Ground returns and machine grounding. - 1926.351(c)(1) A ground return cable shall have a safe current carrying capacity equal to or exceeding the specified maximum output capacity of the arc welding or cutting unit which it services. When a single ground return cable services more than one unit, its safe current-carrying capacity shall equal or exceed the total specified maximum output capacities of all the units which it services. - 1926.351(c)(2) Pipelines containing gases or flammable liquids, or conduits containing electrical circuits, shall not be used as a ground return. For welding on natural gas pipelines, the technical portions of regulations issued by the Department of Transportation, Office of Pipeline Safety, 49 CFR part 192, Minimum Federal Safety Standards for Gas Pipelines, shall…

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# Occupational Safety and Health Administration (cont.) ## 1926.351(c) (cont.) point shall cause rejection of the structures as a ground circuit. ## 1926.351(c)(4) When a structure or pipeline is continuously employed as a ground return circuit, all joints shall be bonded, and periodic inspections shall be conducted to ensure that no condition of electrolysis or fire hazard exists by virtue of such use. - 1926.351(c)(5) The frames of all arc welding and cutting machines shall be grounded either through a third wire in the cable containing the circuit conductor or through a separate wire which is grounded at the source of the current. Grounding circuits, other than by means of the structure, shall be checked to ensure that the circuit between the ground and the grounded power conductor has resistance low enough to permit sufficient current to flow to cause the fuse or circuit breaker to interrupt the current. - 1926.351(c)(6) All ground connections shall be inspected to ensure that they are mechanically strong and electrically adequate for the required current. ## 1926.351(d) Operating instructions. Employers shall instruct employees in the safe means of arc welding and cutting as follows: - 1926.351(d)(1) When electrode holders are to be left unattended, the electrodes shall be removed and the holders shall be so placed or protected that they cannot make electrical contact with employees or conducting objects. - 1926.351(d)(2) Hot electrode holders shall not be dipped in water; to do so may expose the arc welder or cutter to electric shock. - 1926.351(d)(3) When the arc welder or cutter has occasion to leave his work or to stop work for any appreciable length of time, or when the arc welding or cutting machine is to be moved, the power supply switch to the equipment shall be opened. 1926.351(d)(4) Submit Feedback

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U.S. DEPARTMENT OF LABOR # Occupational Safety and Health Administration - Part Number: 1926 - Part Number - Title: Safety and Health Regulations for Construction - Subpart: 1926 Subpart J - Subpart Title: Welding and Cutting - Standard - Number: - 1926.351 - Title: Arc welding and cutting. - GPO Source: e-CFR ## 1926.351(a) ## Manual electrode holders. 1926.351(a)(1) Only manual electrode holders which are specifically designed for arc welding and cutting, and are of a capacity capable of safely handling the maximum rated current required by the electrodes, shall be used. - 1926.351(a)(2) Any current-carrying parts passing through the portion of the holder which the arc welder or cutter grips in his hand, and the outer surfaces of the jaws of the holder, shall be fully insulated against the maximum voltage encountered to ground. ## 1926.351(b) Welding cables and connectors. 1926.351(b)(1) All arc welding and cutting cables shall be of the completely insulated, flexible type, capable of handling the maximum current requirements of the work in progress, taking into account the Submit Feedback

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## How can we stay safe today? (cont.) Construction Toolbox Talk NIOSH CPWR [● # Arc Welding and Electrical Safety - Look for frayed welding leads and damage to the cable insulation and welder. - Ground the welder case so that if a problem develops inside it, a fuse will blow and disconnect the power. - Use mats of plywood, rubber, or some other dry insulation to stand or lie on. - Wear dry gloves in good condition, eye protection, long sleeves, and footwear when welding. GET INFORMATION CDC/NIOSH INFO: 1-800-CDC-INFO (1-[redacted phone]) | TTY: 1-[redacted phone] | cdc.gov/info | cdc.gov/niosh CPWR: Contact [redacted phone] | [redacted email] | www.cpwr.com/toolbox-talks DHHS (NIOSH) Publication No. 2022-128 | DOI: https://doi.org/10.[redacted postal code]/NIOSHPUB2022128 | August 2022

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# Design. (cont.) ## 1910.159(c)(10) Sprinkler spacing. The employer shall assure that sprinklers are spaced to provide a maximum protection area per sprinkler, a minimum of interference to the discharge pattern by building or structural members or building contents and suitable sensitivity to possible fire hazards. The minimum vertical clearance between sprinklers and material below shall be 18 inches (45.7 cm). ## 1910.159(c)(11) Hydraulically designed systems. The employer shall assure that hydraulically designed automatic sprinkler systems or portions thereof are identified and that the location, number of sprinklers in the hydraulically designed section, and the basis of the design is indicated. Central records may be used in lieu of signs at sprinkler valves provided the records are available for inspection and copying by the Assistant Secretary. [45 FR [redacted postal code], Sept. 12, 1980; 46 FR [redacted postal code], May 1, 1981] Scroll to Top OSHA Standards Enforcement Topics Media Center Contact Us OF UNIVERSITY SECURITY STATES OF # U.S. DEPARTMENT OF LABOR Occupational Safety and Health Administration [redacted street address] NW Washington, DC [redacted postal code] 1-800-321-OSHA 1-[redacted phone] www.osha.gov FEDERAL GOVERNMENT OCCUPATIONAL SAFETY & HEALTH

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# Design. (cont.) 1910.159(c)(4) Water supplies. The employer shall assure that every automatic sprinkler system is provided with at least one automatic water supply capable of providing design water flow for at least 30 minutes. An auxiliary water supply or equivalent protection shall be provided when the automatic water supply is out of service, except for systems of 20 or fewer sprinklers. - 1910.159(c)(5) Hose connections for fire fighting use. The employer may attach hose connections for fire fighting use to wet pipe sprinkler systems provided that the water supply satisfies the combined design demand for sprinklers and standpipes. - 1910.159(c)(6) Protection of piping. The employer shall assure that automatic sprinkler system piping is protected against freezing and exterior surface corrosion. - 1910.159(c)(7) Drainage. The employer shall assure that all dry sprinkler pipes and fittings are installed so that the system may be totally drained. - 1910.159(c)(8) - Sprinklers. 1910.159(c)(8)(i) The employer shall assure that only approved sprinklers are used on systems. - 1910.159(c)(8)(ii) The employer may not use older style sprinklers to replace standard sprinklers without a complete engineering review of the altered part of the system. - 1910.159(c)(8)(iii) The employer shall assure that sprinklers are protected from mechanical damage. - 1910.159(c)(9) Sprinkler alarms. On all sprinkler systems having more than twenty (20) sprinklers, the employer shall assure that a local waterflow alarm is provided which sounds an audible signal on the premises upon water flow through the system equal to the flow from a single sprinkler. Submit Feedback