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CTS  ABSTRACTCURRENT LIMITING FUSES: NEW NFPA 70-2017 SECTION 240.67, ARC MODELING AND AN ASSESSMENT BASED ON IEEE 1584-2002 ABSTRACT:-                    When  operating  in  current  limiting  mode,  current limiting  fuses  can  effectively  mitigate  the  heat  and  pressure  hazards  associated  with  an  arc  event  because  they  limit  the current in the first ¼ cycle and interrupt current flow in less than 8.3 ms. The effectiveness of current limiting fuses is reinforced by  their  inclusion  in  NFPA  70E-2015:   Note  to  Table 130.7(C)(15)(A)(b),  Annex  D.4.6,  and  Annex  O.2.4(4).   The incident energy levels associated with current limiting fuses can be determined from IEEE Standard 1584-2002, IEEE Guide for Performing Arc-Flash Hazard Calculations. IEEE 1584-2002 presents  a  method  for  directly  determining  incident  energy without first determining arc current or arc duration. The fuse equations were derived from 600V arc tests involving a range of current limiting fuse sizes. This data is reviewed to assess the performance of current limiting fuses in reducing arc energy in accordance  with  NFPA  70-2017  Section  240.67.   The  IEEE 1584-2002  equations  are  used  to  assess  the  performance  of these  fuses  in  comparison  with  an  arc  energy  reduction maintenance switch, and the combination of both technologies. The  viability  of  predicting  arc  current  and  incident  energy  for installations  involving  current  limiting  fuses  and  implementing NEC Section 240.67 using general arc models is discussed.
IEEE 2017 JAVA PROJECTS ABSTRACTCURRENT LIMITING FUSES: NEW NFPA 70-2017 SECTION 240.67, ARC MODELING AND AN ASSESSMENT BASED ON IEEE 1584-2002 ABSTRACT:- When operating in current limiting mode, current limiting fuses can effectively mitigate the heat and pressure hazards associated with an arc event because they limit the current in the first ¼ cycle and interrupt current flow in less than 8.3 ms. The effectiveness of current limiting fuses is reinforced by their inclusion in NFPA 70E-2015: Note to Table 130.7(C)(15)(A)(b), Annex D.4.6, and Annex O.2.4(4). The incident energy levels associated with current limiting fuses can be determined from IEEE Standard 1584-2002, IEEE Guide for Performing Arc-Flash Hazard Calculations. IEEE 1584-2002 presents a method for directly determining incident energy without first determining arc current or arc duration. The fuse equations were derived from 600V arc tests involving a range of current limiting fuse sizes. This data is reviewed to assess the performance of current limiting fuses in reducing arc energy in accordance with NFPA 70-2017 Section 240.67. The IEEE 1584-2002 equations are used to assess the performance of these fuses in comparison with an arc energy reduction maintenance switch, and the combination of both technologies. The viability of predicting arc current and incident energy for installations involving current limiting fuses and implementing NEC Section 240.67 using general arc models is discussed.
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