UL 3741-2020 pdf free download.Photovoltaic Hazard Control. 1.2.4 Body resistances of adult fire fighters (FF) are defined in this standard to set the criteria by whichshock hazards are evaluated. 1.2.5 The materials and methods used to construct the PV array are included in the evaluation. Theevaluation to this standard is intended to result in an identified list of PV Hazard Control Equipment(PVHCE) determined to be necessary for the PV hazard control means.The list of PVHCE, and anycharacteristics of other connected equipment or systems that are essential to maintain the operationalintegrity of the hazard control function are documented in the PVHCE and / or the PV Hazard ControlSystem (PVHCS) installation instructions in accordance with this standard. 1.2.6 The evaluation is based on a risk assessment of the electrical shock hazards to fire fighters (FF)working in the vicinity of the PV array. 1.2.7 The evaluation addresses the electrical hazard potential of PV array equipment on or integratedinto buildings. 1.3 Equipment and conditions excluded from scope1 1.3.1 The evaluation does not include equipment where the hazard control systems or functions havebeen rendered ineffective due to physical damage not specifically addressed in this standard.Examples ofphysical damage not addressed are the direct exposure of components to fire, smoke, high-pressure hosespray, or major systemic physical damage such as building collapse, destruction or removal of the array. NOTE:See Section 12.3 for the fire fighter (FF) interactions, including handheld hose lines, specifically addressed by this standard.Firefighting Monitors are controllable high capacity water jets that operate at higher pressures and volumes which can result inmechanical or structural damage to equipment and are therefore excluded from the scope of this standard. 1 Additional installation requirements addressing rapid shutdown of PV system circults can be found in the National Electical Code(NEC),NFPA 70, Section 690.12,Rapid Shutdown of PV Systems on Buildings, and the CanadianElectrical Code (CE Code) C22.164-218 requirements. 1.3.2 While this standard accounts for fire fighters (FF) wearing new or serviceable used PPE, it does notinclude consideration for any damage to PPE that occurred prior to fire fighter (FF) interaction with the Pvarray. NOTE: Standard operating procedures is to replace damaged fire fighting PPE. 1.3.3 The use of extinguishing agents not specified in this standard,such as seawater or high foamconcentrations, are not included in the evaluation. NOTE: The requirements and resistance data in this standard are based on expected practices and are considered to provideinformation sufficient for performing a safety analysis....
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