Visual and oxide analysis for identification of electrical fire scene

Xie, Dong; Wang, Wen; Lv, Shilei; Deng, Shi Feng

doi:10.1016/j.forsciint.2018.01.002

Cited by 10 publications

(2 citation statements)

References 13 publications

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“…From the statistics of the Emergency Management Department Fire and Rescue Bureau in China [ 1 ], in 2018 electrical fires accounted for 36.6% of the total number of fires in China. In these electrical fires, the main causes included short circuits, overload, poor contact, and electrical equipment failure, among which short circuits, neutral wire floats, and lightning strikes will all make an electrical system overcurrent fault [ 2 , 3 , 4 , 5 ]. Therefore, overcurrent fault is the final manifestation of a variety of electrical fire causes.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Characteristics of Arc Beads with Overcurrent Fault in the Fire Scene

Chen

Deng

et al. 2020

Materials

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Arc beads are high-temperature luminous electric discharges that form across a gap between two bodies, which is one of the vital forensic pieces of evidence for the evaluation of electrical fires. In this study, based on an actual electrical fire, the microstructure of arc beads from a copper wire that experienced an overcurrent fault was investigated by optical microscopy and scanning electron microscopy. Moreover, the effects of the overcurrent intensity on the grain morphology, trace elements, and microstructure of the arc beads were analyzed. The results showed that the simulated metallographic structure of the arc beads is mainly dendrite at four times the rated current, which is consistent with the fire scene. With an increase in the overcurrent, the average diameter, perimeter, and area of the grains increased, while the dendrite growth was inhibited by the overcurrent. In addition, the main trace elements were Cu, C, O, and Cl. When the current increased, the Cu content gradually decreased and tended to be stable, while the C content gradually increased. The conclusion of this research provided a scientific reference for identifying the melting trace in a copper conductor under overcurrent fault.

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Section: Introductionmentioning

confidence: 99%

Microstructural Characteristics of Arc Beads with Overcurrent Fault in the Fire Scene

Chen

Deng

et al. 2020

Materials

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“…Physical or chemical testing, such as simple visual observation of the macrostructure, Auger analysis (AES), X-ray photoelectron spectroscopy (XPS), secondary ion mass spectrometry (SIMS) and dendritic arm spacing (DAS) methods, have been proposed to analyze the beads of copper wires residues found in fire scenes [4][5][6][7][8][9][10]. However, most of the methods only entail subjective and qualitative criteria for distinguishing between beads that did or did not start a fire [11,12].…”

Section: Introductionmentioning

confidence: 99%

Microscopic and Metallurgical Studies as a Function on Forensic Investigation of Electrical Fires

Khafagy

Guda

Barakat

2020

KEM

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Electrical wires with melted ends showing beaded, drop-shaped, and pointed shapes are frequently encountered after fires that may provide useful information on the cause and development of the fire.Various methods have been studied for differentiating between primary arcing beads, (indicating arcing as the fire cause) and secondary arcing beads (indicating arcing as a result of the fire). There are few studies carried out on the melting globules produced due to fire heat. Also, in some major cases, primary arcing beads and secondary arcing beads are difficult to be identified by using one method. In this study, a full scheme of differentiating methods between simulated samples of melting globules, primary arcing beads and secondary arcing beads are processed with macroscopic investigation. The in-depth composition of carbon quantitative analysis and metallurgical analysis of these samples have been studied. The results of this study has proved that the real cases are compatible with simulated ones.

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Study on quantitative metallographic analysis method of copper wire melt trace under short-circuit and fire conditions

Wang,

Zhao,

Liu

et al. 2023

J Therm Anal Calorim

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Visual and oxide analysis for identification of electrical fire scene

Cited by 10 publications

References 13 publications

Microstructural Characteristics of Arc Beads with Overcurrent Fault in the Fire Scene

Microstructural Characteristics of Arc Beads with Overcurrent Fault in the Fire Scene

Microscopic and Metallurgical Studies as a Function on Forensic Investigation of Electrical Fires

Study on quantitative metallographic analysis method of copper wire melt trace under short-circuit and fire conditions

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