2024 NFPA 70E, Energized Work and Risk Assessment & Mitigating Risks & PPE Requirements &, Exams of Nursing

Download 2024 NFPA 70E, Energized Work and Risk Assessment & Mitigating Risks & PPE Requirements & and more Exams Nursing in PDF only on Docsity! 2024 NFPA 70E, Energized Work and Risk Assessment & Mitigating Risks & PPE Requirements & Safety Related Maintenance and Special Equipment Exam with Correct Answers Performing Energized Work - correct answer --Infeasibility, troubleshooting equipment malfunctions, taking voltage measurements, de-energizing poses additional hazard, equipment is in normal operating condition, equipment operates at a voltage under 50 volts Energized Electrical Work Permits - correct answer --Energized electrical work permits must be completed any time an employee will perform work within the restricted approach boundary. - Who is requesting the work?, who is performing the work?, who is authorizing the work? When is a Permit Not Required - correct answer --Tasks that pose little risk, tasks that are justified -A qualified person using safe work practices and PPE is required for any justified energized work Shock Risk Assessment - correct answer --Identify shock hazards, -Estimate likelihood of occurrence of injury or damage to health -Potential severity of injury or damage to health, determine if additional protective measures are required Approach Boundaries for Shock Protection - correct answer --Limited approach boundary is a distance at which a shock hazard exists. -Restricted approach boundary is a distance at which there is an increased likelihood of electric shock. Limited Approach Boundary - correct answer --No qualified persons may cross the limited approach boundary -Exceptions: permit unqualified to cross the limited approach boundary -Limited Approach Boundary Table: 2024 NFPA 70E, Energized Work and Risk Assessment & Mitigating Risks & PPE Requirements & Safety Related Maintenance and Special Equipment 130.4(E)(a) Restricted Approach Boundary - correct answer --The employee is insulated or guarded from the energized circuit parts -Energized conductors or parts are insulated from the person and other conductive objects at a different potential Arc Flash Risk Assessment - correct answer --Identify if an arc flash hazard exists, estimate the level of risk the employee, determine if additional protective measures are required Arc Flash Variables - correct answer --Lack of maintenance, larger and smaller amounts of available fault current , larger amounts of available fault current Arc energy inside an enclosure can create extreme pressures. Proven equipment designs and practices that may be used include: -Arc resistant switch gear, remote racking, high resistance grounding Arc Flash Boundary & Requirements - correct answer -1. Incident energy analysis = 1.2 calories / cm^2 -Table 130.5(G) 2. Arc Flash PPE Category -The available fault current, the clearing time of the overcurrent protective device that will clear the fault in the event one occurs. Over Variables: -System voltage, arcing time, distance from act to person, available bolted-fault current, arcing current Arcing Flash and Arc Blast - correct answer -Arcing Fault: -Ionizes the air around energized circuit parts so air itself becomes a conductor, results in a lower level of current flowing, could increase the clearing time of the OCPD 2024 NFPA 70E, Energized Work and Risk Assessment & Mitigating Risks & PPE Requirements & Safety Related Maintenance and Special Equipment 5. Administrative Controls: -Only work if they are followed 6.PPE: -Can offer a false sense of security. It is not a substitute for other measures Alerting Techniques - correct answer -Standards for alerting techniques include: -Signs and safety tags, barricades, attendants Gloves - correct answer --The voltage rating of gloves without leather protectors is reduced by 50% for Class 00 or on whole class for 0 through 4. Equipment Labeling and Marking - correct answer --Marking that contains the incident energy must be reviewed for accuracy at intervals Not to exceed 5 years. Arc Flash Hazard PPE Categories - correct answer -Parameters Include: - Available fault current, arc duration for DC systems, maximum clearing time, working distance Table 130.7(C)(15)(a) for AC System -Panelboards categories have the same parameters for: Voltages 240 volts below and Voltages over 240 and up to 600 volts -MCC Categories, each 600 V class, have different parameters: 65 kA and 2 cycles 42 kA and 20 cycles Table 130.7(C)(15)(b) for DC System 2024 NFPA 70E, Energized Work and Risk Assessment & Mitigating Risks & PPE Requirements & Safety Related Maintenance and Special Equipment ARC Flash PPE Categories - correct answer -Category 1: -Minimum arc rating 4 cal /cm^2 Arch Flash Boundary: 19 inches The back of the head will not be inside the arc flash boundary -Rubber insulating gloves with leather protectors do provide an acceptable amount of arc protection Category 2: - Minimum arc rating: 8cal/cm^2 -Arch Flash Boundary: 3 ft. -More of the body will be in the arc flash boundary Category 3: -Minimum arc rating: 25 cal/cm^2 -The worker must wear either arc-rated gloves or insulated gloves with leather protectors Category 4: -Minimum arc rating: 40 cal/cm^2 ARC Rating - correct answer -ASTM F 1959 Arc Thermal Protection Value (ATPV): -Incident energy that produces 50% probability of causing 2nd degree burn through the garment Energy Breakthrough Level: - Incident energy that produces 50% probability of break open of the garment Equipment Labeling - correct answer -The equipment owner is responsible for: -Documentation, installation, and maintenance. 2024 NFPA 70E, Energized Work and Risk Assessment & Mitigating Risks & PPE Requirements & Safety Related Maintenance and Special Equipment Labels must contain: -Nominal system voltage, available fault current at the service overcurrent protective devices, the clearing time of the protective device based on the available fault current, the date the label was applied The label is nor required if an arc flash label is applied in accordance with acceptable industry practice Spaces, Signs, and Identification - correct answer -The owner must ensure that: -Access to working space and escape passages must be kept clear and unobstructed -Warning signs, where required, must be visible, securely attached, and maintained in legible condition -Circuit or voltage identification must be securely and maintained in updated and legible condition Circuit Breakers - correct answer -Molded Case Circuit Breakers must be maintained free of cracks in cases and of cracked or broken operating handles Equipment in Hazardous Locations - correct answer -Hazardous Locations must use: -Positive pressure ventilation, purged and pressurized equipment, circuits that are explosion proof, non incendive, and intrinsically safe Requirements: - No exposed energized parts, wrench tight threaded conduit, intact and securely fastened bonding jumpers, bolted covers with all bolts installed and bolted tightly, legible and not exceeded marking of luminaires for maximum lamp wattage and temperature rating, secure and legible required markings, close-up plugs, breathers, seals, and drains secured in place Battery Systems - correct answer -Risk Assessment for a Battery Room: A risk assessment must be performed to identify: -Chemical hazards, electrical shock hazards, arc flash hazards Capacitors - correct answer -Hard Grounding -Being connected to ground with little to no resistance to limit current 2024 NFPA 70E, Energized Work and Risk Assessment & Mitigating Risks & PPE Requirements & Safety Related Maintenance and Special Equipment