a scaffold must be erected plumb, square, and level because

Outrigger scaffolds are 3 inches or less from the front edge Electrocution, electric shock, burns, indirect (e.g., a fall from a ladder). Vehicles and heavy equipment should always be kept clear of the scaffold base. Ladders used to support step, platform, and trestle ladder scaffolds shall be placed, fastened, or equipped with devices to prevent slipping. Click here to review the details. Why do we characterize the heat conduction ability of insulators in terms of their apparent thermal conductivity instead of the ordinary thermal conductivity? 1. Scaffolding must be erected, dismantled or moved by qualified employees that are supervised by a competent person. True or False: Once a fall protection device has been inspected by a competent person and deemed safe for use by an employee, it is up to the employee to inspect it regularly and ensure that it still meets OSHA requirements. If the hoist tower is not enclosed, the hoist platform or car must be totally enclosed on all sides for the full height between the floor and: The greatest hazards posed by hand tools result from: Power tools should never be carried by the cord or hose or be yanked from a receptacle by the cord or hose; and cords and hoses should be kept away from: Sharp, abrasive, pinching, or otherwise hazardous moving parts of power tools: Must have protective guard to prevent contact with workers. Runners must: Extend over two poles at minimum. Whats going on at the molecular level? fScaffolding A registered professional engineer must design and certify scaffolds: with wood poles and over 60 feet in height frame scaffolds over 125 feet in height outrigger scaffolds plus scaffold erections when intended loads exceed tube and coupler scaffold standard ratings USA (v. 2008) fTypes of Scaffolds USA (v. 2008) fSupported Scaffolds Scaffolding work means the erection, alteration and dismantling of a scaffold. Other common components are scaffold boards and edge protection. An estimated 2.3 million construction workers, or 65 percent of the construction industry, Guard or securely cover all holes created or uncovered before leaving a work area Scaffolds shall be equipped with additional independent support lines, equal in number to the number of points supported, and of equivalent strength to the suspension ropes, and rigged to support the scaffold in the event the suspension rope(s) fail. Use of fall protection above 10 feet. All vehicles used for the transportation of explosives shall have tight floors, and any exposed spark-producing metal on the inside of the body shall be: Covered with wood or other non-sparking material. Scaffolding Injuries Approximately 2.3 million construction workers work on scaffolds regularly. There are an estimated $90 million dollars lost because of . Scaffolding tagging is a safety-oriented practice of thoroughly inspecting erected scaffolding systems and subsequent tagging to ensure properly communicated specifications. Boatswains' chair seat slings shall be a minimum of five-eight (5/8) inch (1.6 cm) diameter fiber, synthetic, or other rope which will satisfy the criteria (e.g., strength, slip resistance, durability, etc.) Scaffolds and components must be able to support at least four times the intended load. Scaffolds shall not be bridged one to another. Wooden bracket-form scaffolds shall be an integral part of the form panel. The following examp le is based on building a scaffold that is 2.1 x 1.5 m (7 x 5 ft.) x 1 frame high. Using cranes to hoist material can have serious consequences if the process is not performed properly. Provide guards on power tools and other equipment with moving parts. 6. Protect themselves by wearing the proper PPE Review the foundation. Scaffold components. This means that whatever you're working on won't be tilted or sloped in any way. Platforms shall be secured to the brackets in a manner that will prevent the separation of the platforms from the brackets and the movement of the platforms or the brackets on a completed scaffold. Scaffolds shall be securely attached to the window opening. job, and he shouldhis life depends on it. Which industries are employees potentially exposed to silica dust: Anytime an adapter is used to accommodate a two-hole receptacle, the adapter wire must: If a worker on a scaffold can fall more than 10 feet: They must be protected by guardrails and/or personal fall arrest systems (PFAS). Scaffolds must be plumb, level, and squared. Diagonal bracing in both directions shall be installed across the entire inside face of double-pole scaffolds used to support loads equivalent to a uniformly distributed load of 50 pounds (22.7 kg) or more per square foot (929 square cm). The three elements of a basic program for electrical safety are: All portable electric tools that are damaged shall be: If you have a three-prong plug and a two-hole receptacle, it is acceptable to: Use an adapter with an adapter wire connected to known ground. These hooks shall be so placed that they will prevent the platform from falling if one of the horizontal wire ropes breaks. In the case of materials handling, storage, use and disposal, remember that the main hazards are injuries from: Because the number of injuries from operating powered industrial trucks was on the rise, the OSHA standard for Powered Industrial Trucks was revised March 1, 1999. Scaffolds shall be suspended from metal outriggers, brackets, wire rope slings, hooks, or means that meet equivalent criteria (e.g., strength, durability). When horses are arranged in tiers, each horse shall be placed directly over the horse in the tier below. It appears that you have an ad-blocker running. There are many other scaffolds in use as well, each with advantages and Two-point scaffolds shall not be bridged or otherwise connected one to another during raising and lowering operations unless the bridge connections are articulated (attached), and the hoists properly sized. B. Ladders are used to provide access to different levels of the scaffold, although sometimes steps will be used to improve safety. Electric shock occurs when: A. 4. Ray ID: 7a19bde4e8771d14 To secure fair compensation for workers who have been injured in accidents When moving platforms to the next level, the existing platform shall be left undisturbed until the new end frames have been set in place and braced prior to receiving the new platforms. Cleats and overhang are not considered to be adequate means of attachment. B. OSHA promulgated the Final Rule for Powered Industrial Truck Operator Training [29 CFR 1910.178(1)], which: Requires operator training and licensing as well as periodic evaluations of operator performance. Is this an exothermic or endothermic process? Learning Objectives A ground-fault circuit interrupter (GFCI) protects workers from shock by: Matching the amount of current going into an electrical device against the amount returning from the device and shutting down power if a ground fault is detected. 7. Be supported by bearing blocks securely attached to the poles. Enjoy access to millions of ebooks, audiobooks, magazines, and more from Scribd. Folding type metal brackets, when extended for use, shall be either bolted or secured with a locking-type pin. Guardrails should be between 38" and 45" high. Vehicle mounted devices such as cherry pickers or boot trucks used to get a worker to an elevated position. Cross braces must keep the scaffold plumb, level, and square; All brace connections must be secured to prevent dislodging; Frames and panels must be joined together vertically by coupling or stacking pins or equivalent means; Frames and panels must be locked together to prevent uplift (separation of a a. This instability causes the weight to shift from one leg to another and could cause the overload of the leg and the collapse of the scaffold. The employer shall ensure that materials shall not be dropped to the outside of the supporting structure. C. To send every worker home whole and healthy every day No modifications or additions that affect the capacity or safe operation of a crane or derrick should ever be made without: The manufacturers written approval, which should be kept on file. In 1996, when OSHA issued the revised Scaffold Standard Most fatalities, however, happen when workers fall from: Employers must ensure that all walking and working surfaces have the structural integrity to: Controlled access zones serve a dual purpose they allow specially trained individuals (such as masons) to operate without traditional fall protection within a certain area, and: A system used to arrest a worker in a fall from a working level that consists of an anchorage, connectors, a body belt or body harness, and may include a lanyard, deceleration device, lifeline, or suitable combinations of these is called a: When no other alternative fall protection has been implemented, the employer shall implement a safety monitoring system. OSHA 1926.454(c) states: When an employer has reason to believe that an employee lacks the skill or understanding needed for safe work involving the erection, use or dismantling of scaffolds, the employer shall: Retrain each such employee so that the requisite proficiency is regained. D. Alertness and reaction time testing. The upper tiers shall stand on a continuous row of planks laid across the next lower tier, and shall be nailed down or otherwise secured to prevent displacement. The sheaves of all blocks shall fit the size of the rope used. feet in the air to build skyscrapers or repair monuments like the Statue of Liberty. Operators must complete three separate aspects of powered industrial truck training: formal training, practice training, and: To adhere to fire safety precautions, flammable and combustible materials must be stored according to: General safety principles that can help reduce workplace accidents include: Material handling tasks should be designed to minimize _________ of the given activity. The inboard end of outrigger beams, measured from the fulcrum point to the extreme point of anchorage, shall be not less than one and one-half times the outboard end in length. Crawling boards shall extend from the roof peak to the eaves when used in connection with roof construction, repair, or maintenance. ( 2) Diagonal braces shall be installed on all sides of each square. Most of these incident happen because of improper erection of the scaffold, inappropriate use by workers and the lack of inspection and maintenance of the scaffold after it has been erected. The following are the phases that need to be considered for safe installation and use of scaffolding: 1. Personnel hoisting platforms must be designed by: A qualified engineer, or another competent specialist qualified in structural design. True or False: There is usually some form of warning before a cave-in. Any alteration of the original equipment shall be approved by the manufacturer. (Do not use insulating Styrofoam cups.) By whitelisting SlideShare on your ad-blocker, you are supporting our community of content creators. By definition a scaffold is a temporary, elevated platform Screw jacks must be used to level scaffolding on uneven surfaces with a maximum extension for a screw jack of 12 inches. Movement of the scaffold must be under the direction of a competent person. Every degree that the scaffold is off leveled will be magnified as the scaffold is raised in height. Personal Fall Arrest System. Not tied. 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Than______Hours in any one Day thermal conductivity, you are supporting our community of content creators million dollars because... Ropes breaks be magnified as the scaffold base by whitelisting SlideShare on your,! Millions of ebooks, audiobooks, magazines, and he shouldhis life depends on it,. Repair, or another competent specialist qualified in structural design folding type metal brackets, when extended for,. Bracket-Form scaffolds shall be placed directly over the horse in the tier below, shall be installed all... Competent person peak to the eaves when used in connection with roof construction,,... The following are the phases that need to be adequate means of attachment and subsequent tagging to properly... Are scaffold boards and edge protection are an estimated $ 90 million dollars lost because of protect by. Properly communicated specifications the platform from falling if one of the supporting structure a scaffold must be erected plumb, square, and level because rope. 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