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Effect of the Current on the Fire Characteristics of Overloaded Polyvinyl Chloride Copper Wires
In this study, the fire behavior variation of unenergized polyvinyl chloride (PVC) copper wires subjected to overload with different currents was investigated by a cone calorimeter. Overload currents were selected from 1 times safe-rated current (I(e)) to 3.5 times I(e) to obtain tested sample wires...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9656160/ https://www.ncbi.nlm.nih.gov/pubmed/36365758 http://dx.doi.org/10.3390/polym14214766 |
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author | Li, Zhe Lin, Qingwen Li, Yang Lyu, Huifei Wang, Huaibin Sun, Junli |
author_facet | Li, Zhe Lin, Qingwen Li, Yang Lyu, Huifei Wang, Huaibin Sun, Junli |
author_sort | Li, Zhe |
collection | PubMed |
description | In this study, the fire behavior variation of unenergized polyvinyl chloride (PVC) copper wires subjected to overload with different currents was investigated by a cone calorimeter. Overload currents were selected from 1 times safe-rated current (I(e)) to 3.5 times I(e) to obtain tested sample wires. The mass fraction, time to ignition (TTI), heat release rate (HRR), gas emission, and residue were measured. If the current flowing through the wire increased up to 3.5 times I(e), the TTI of this unenergized wire increased drastically and the peak HRR (pHRR) decreased notably so that the flame growing index (FGI) reduced considerably. When the wire carried less than three times I(e), the FGI remained stable. For all overloaded PVC copper wires, the increase in the heat flux resulted in a higher pHRR and a lower burning duration. However, regardless of the external heat flux exposure, the FGI of copper wires overloaded at 3.5 times I(e) was lower than that of copper wires carrying less than other times I(e). Moreover, the consumption of O(2) and generation of CO(2) as the heat flux varied were consistent with that of the HRR. Opposed to expectation, the flame propagation of unenergized PVC copper wires would decline in a fire, if the wire has been damaged by overload with some currents. |
format | Online Article Text |
id | pubmed-9656160 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-96561602022-11-15 Effect of the Current on the Fire Characteristics of Overloaded Polyvinyl Chloride Copper Wires Li, Zhe Lin, Qingwen Li, Yang Lyu, Huifei Wang, Huaibin Sun, Junli Polymers (Basel) Article In this study, the fire behavior variation of unenergized polyvinyl chloride (PVC) copper wires subjected to overload with different currents was investigated by a cone calorimeter. Overload currents were selected from 1 times safe-rated current (I(e)) to 3.5 times I(e) to obtain tested sample wires. The mass fraction, time to ignition (TTI), heat release rate (HRR), gas emission, and residue were measured. If the current flowing through the wire increased up to 3.5 times I(e), the TTI of this unenergized wire increased drastically and the peak HRR (pHRR) decreased notably so that the flame growing index (FGI) reduced considerably. When the wire carried less than three times I(e), the FGI remained stable. For all overloaded PVC copper wires, the increase in the heat flux resulted in a higher pHRR and a lower burning duration. However, regardless of the external heat flux exposure, the FGI of copper wires overloaded at 3.5 times I(e) was lower than that of copper wires carrying less than other times I(e). Moreover, the consumption of O(2) and generation of CO(2) as the heat flux varied were consistent with that of the HRR. Opposed to expectation, the flame propagation of unenergized PVC copper wires would decline in a fire, if the wire has been damaged by overload with some currents. MDPI 2022-11-07 /pmc/articles/PMC9656160/ /pubmed/36365758 http://dx.doi.org/10.3390/polym14214766 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Li, Zhe Lin, Qingwen Li, Yang Lyu, Huifei Wang, Huaibin Sun, Junli Effect of the Current on the Fire Characteristics of Overloaded Polyvinyl Chloride Copper Wires |
title | Effect of the Current on the Fire Characteristics of Overloaded Polyvinyl Chloride Copper Wires |
title_full | Effect of the Current on the Fire Characteristics of Overloaded Polyvinyl Chloride Copper Wires |
title_fullStr | Effect of the Current on the Fire Characteristics of Overloaded Polyvinyl Chloride Copper Wires |
title_full_unstemmed | Effect of the Current on the Fire Characteristics of Overloaded Polyvinyl Chloride Copper Wires |
title_short | Effect of the Current on the Fire Characteristics of Overloaded Polyvinyl Chloride Copper Wires |
title_sort | effect of the current on the fire characteristics of overloaded polyvinyl chloride copper wires |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9656160/ https://www.ncbi.nlm.nih.gov/pubmed/36365758 http://dx.doi.org/10.3390/polym14214766 |
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