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When a product containing electrical or electronic systems fails, determining what happened may require more than observing the damaged product. Relevant evidence may be found inside a circuit board, connector, battery pack, power supply, control system, or embedded device.
Electrical engineering expertise can be particularly useful when disputed questions about a product's condition, failure mechanism, or causation depend on electrical or electronic evidence. An electrical engineering expert witness may examine failure mechanisms, design documents, applicable standards, competing causes, and testing results to help counsel, the court, or the factfinder understand those issues. The expert's role is not to decide liability.
This guide explains when electrical engineering expertise may be useful in product liability litigation, what an expert may examine, how failure analysis works, and how codes, standards, and Federal Rule of Evidence 702 may affect the expert's analysis and testimony.
Electrical product liability disputes may involve consumer electronics, appliances, power tools, electric vehicles, industrial equipment, medical devices, charging systems, and products with embedded electronic controls.
Product liability law varies by jurisdiction. Common defect categories include design defects, manufacturing defects, and inadequate warnings or instructions. Depending on governing law, claims may proceed under strict liability, negligence, warranty, statutory, or other legal theories.
Electrical issues may arise differently under each category:
A product's failure does not by itself establish why it failed or whether a legally actionable defect existed. Depending on the allegations and evidence, the investigation may need to consider product condition, installation, repairs, misuse, environmental conditions, external electrical events, and other plausible causes.
Electrical engineering expert witnesses can help investigate product liability cases involving electrical fires, shock, batteries, circuits, controls, and other electronic failures. This article explains when to retain an expert, how electrical failure analysis evaluates defects and competing causes, the role of codes and standards, and reliability requirements under Rule 702.
Causation Analysis
Electrical Fires
Fire Cause and Origin Investigations
Forensic Analysis
Laboratory Testing
Preservation
Evidence Analysis
When a product containing electrical or electronic systems fails, determining what happened may require more than observing the damaged product. Relevant evidence may be found inside a circuit board, connector, battery pack, power supply, control system, or embedded device.
Electrical engineering expertise can be particularly useful when disputed questions about a product's condition, failure mechanism, or causation depend on electrical or electronic evidence. An electrical engineering expert witness may examine failure mechanisms, design documents, applicable standards, competing causes, and testing results to help counsel, the court, or the factfinder understand those issues. The expert's role is not to decide liability.
This guide explains when electrical engineering expertise may be useful in product liability litigation, what an expert may examine, how failure analysis works, and how codes, standards, and Federal Rule of Evidence 702 may affect the expert's analysis and testimony.
Electrical product liability disputes may involve consumer electronics, appliances, power tools, electric vehicles, industrial equipment, medical devices, charging systems, and products with embedded electronic controls.
Product liability law varies by jurisdiction. Common defect categories include design defects, manufacturing defects, and inadequate warnings or instructions. Depending on governing law, claims may proceed under strict liability, negligence, warranty, statutory, or other legal theories.
Electrical issues may arise differently under each category:
A product's failure does not by itself establish why it failed or whether a legally actionable defect existed. Depending on the allegations and evidence, the investigation may need to consider product condition, installation, repairs, misuse, environmental conditions, external electrical events, and other plausible causes.
Early electrical engineering involvement can be especially useful when a fire, explosion, burn, electrocution, or shock may involve an electrical product or power source. An engineer may evaluate arcing, insulation or conductor damage, overcurrent conditions, grounding, protective devices, charging systems, and other electrical evidence.
When fire origin and cause are disputed, electrical engineering may be only one part of the investigation. A qualified fire investigator may use a systematic methodology and consult NFPA 921 where appropriate. An electrical engineer may focus on electrical mechanisms within the engineer's expertise.
Battery incidents may also call for specialized battery or thermal expertise, depending on the disputed failure mechanism.
Many products combine hardware, firmware, sensors, communications systems, and automated controls. An electrical engineer may be needed when an incident involves:
The expert should remain within the scope of their qualifications and experience. Hardware expertise does not necessarily qualify an electrical engineer to conduct source-code analysis, cybersecurity testing, or specialized software validation. Separate software, computer engineering, or cybersecurity expertise may be appropriate when those issues are central.
Electrical engineering analysis can be useful when the parties dispute whether the subject product conforms to its intended design or whether particular design features are relevant to an alleged hazard.
For a manufacturing issue, an expert may compare the subject unit with schematics, specifications, bills of materials, production records, and exemplar products to determine whether a component or assembly differs from the intended configuration.
For a design issue, the engineer may examine protection circuits, insulation, grounding, component ratings, thermal conditions, foreseeable operating conditions, and other relevant design features. Whether those findings meet the jurisdiction's legal standard for a design defect depends on applicable law.
An electrical engineering expert can be particularly useful when several explanations for an incident are technically plausible. One party may attribute a fire to an internal component failure, while another points to installation, an external electrical condition, prior repair work, or misuse.
The engineer can evaluate those hypotheses using physical evidence, operating data, electrical calculations, testing, and known system behavior. When technically plausible alternatives could materially affect the opinion, a well-supported analysis should address them rather than assume that the alleged defect caused the event.
An electrical engineering expert may begin by identifying the evidence needed to understand the product's condition and operation.
Depending on the technology and allegations, the expert may review:
The expert may also perform electrical measurements, component examinations, insulation or continuity testing, functional tests, thermal analysis, or controlled exemplar testing when appropriate.
Before potentially destructive examination, counsel and the expert should consider applicable preservation obligations, inspection protocols, and court orders. If disassembly proceeds, documenting the product and retaining removed components may help preserve the evidentiary record.
A strong engineering opinion should clearly show how the evidence supports the conclusion. The precise method depends on the product and alleged failure.
The expert may document the evidence, review the product's design and operating environment, and develop plausible failure explanations involving component failure, manufacturing variation, circuit behavior, external power conditions, installation, misuse, environmental exposure, or maintenance. Those possibilities may be evaluated through measurements, calculations, testing, exemplar comparison, design review, and relevant technical literature or standards.
The analysis should also identify important limitations, such as missing components, post-incident damage, incomplete data, undocumented repairs, or testing constraints.
Codes and standards can provide useful technical benchmarks, but the applicable document depends on the product, system, date, and jurisdiction.
The National Electrical Code, NFPA 70, primarily addresses electrical installations. Although NFPA publishes the 2026 edition, counsel should confirm which edition and amendments apply in the relevant jurisdiction. The NEC may be relevant to wiring, grounding, installation, or a product's interface with the electrical system, but it should not automatically be treated as the governing product-design or legal standard for a particular claim.
Product-specific UL, IEC, IEEE, or other standards may address the equipment itself. Their applicability and legal significance depend on the product, circumstances, jurisdiction, and governing law.
The expert's analysis should identify:
An expert may address technical compliance or noncompliance, while counsel should assess what legal significance, if any, governing law assigns to that evidence.
In federal proceedings governed by the Federal Rules of Evidence, Rule 702 provides the principal standard for admitting electrical engineering expert testimony. The most recent amendments to Rule 702 took effect on December 1, 2023, and the rule appears in the Federal Rules of Evidence as amended through December 1, 2025.
Rule 702 also requires the witness to be qualified as an expert by knowledge, skill, experience, training, or education.
The proponent must demonstrate to the court that it is more likely than not that:
In Daubert v. Merrell Dow Pharmaceuticals, Inc., the Supreme Court addressed the federal court's gatekeeping responsibility for scientific expert testimony. In Kumho Tire Co. v. Carmichael, the Court confirmed that the same responsibility extends to technical and other specialized testimony, including engineering.
For an electrical engineer, admissibility depends on more than credentials. The expert should be able to explain the evidence reviewed, the methods used, how the conclusions follow from the evidence, and, when material, how competing explanations were evaluated.
State evidentiary standards vary, so counsel should confirm the rules governing expert testimony in the applicable jurisdiction.
Early discussions with an expert should clarify the technical scope and limits of the proposed investigation.
Useful questions include:
These questions can help counsel focus discovery on evidence that may affect the engineering analysis.
When should an electrical engineering expert be retained in a product liability case?
An electrical engineering expert should be considered early when an alleged failure involves circuits, wiring, power supplies, batteries, electronic controls, electrical fires, shock, or other technical electrical mechanisms.
What products may involve electrical engineering failure analysis?
Electrical engineering analysis may be useful for appliances, consumer electronics, power tools, industrial equipment, electric vehicles, chargers, medical equipment, and smart-home devices. The appropriate specialty depends on the technology and alleged failure.
How can an electrical engineering expert evaluate an alleged product defect?
The expert can compare physical evidence with the product's design, specifications, manufacturing records, operating data, testing, and applicable technical standards. Whether those findings satisfy the jurisdiction's legal definition of a defect is a separate legal question.
Can an electrical engineering expert determine what caused a product fire?
An electrical engineer may evaluate electrical ignition mechanisms and whether particular electrical conditions are supported by the evidence. Broader fire-origin-and-cause analysis or complex battery incidents may require additional expertise.
What qualifications matter when selecting an electrical engineering expert witness?
Counsel should consider relevant education, engineering experience, familiarity with the technology and failure mechanism, and experience with applicable testing and standards. Professional Engineer licensure may also be relevant depending on the assignment and jurisdiction.
Early electrical engineering involvement can be especially useful when a fire, explosion, burn, electrocution, or shock may involve an electrical product or power source. An engineer may evaluate arcing, insulation or conductor damage, overcurrent conditions, grounding, protective devices, charging systems, and other electrical evidence.
When fire origin and cause are disputed, electrical engineering may be only one part of the investigation. A qualified fire investigator may use a systematic methodology and consult NFPA 921 where appropriate. An electrical engineer may focus on electrical mechanisms within the engineer's expertise.
Battery incidents may also call for specialized battery or thermal expertise, depending on the disputed failure mechanism.
Many products combine hardware, firmware, sensors, communications systems, and automated controls. An electrical engineer may be needed when an incident involves:
The expert should remain within the scope of their qualifications and experience. Hardware expertise does not necessarily qualify an electrical engineer to conduct source-code analysis, cybersecurity testing, or specialized software validation. Separate software, computer engineering, or cybersecurity expertise may be appropriate when those issues are central.
Electrical engineering analysis can be useful when the parties dispute whether the subject product conforms to its intended design or whether particular design features are relevant to an alleged hazard.
For a manufacturing issue, an expert may compare the subject unit with schematics, specifications, bills of materials, production records, and exemplar products to determine whether a component or assembly differs from the intended configuration.
For a design issue, the engineer may examine protection circuits, insulation, grounding, component ratings, thermal conditions, foreseeable operating conditions, and other relevant design features. Whether those findings meet the jurisdiction's legal standard for a design defect depends on applicable law.
An electrical engineering expert can be particularly useful when several explanations for an incident are technically plausible. One party may attribute a fire to an internal component failure, while another points to installation, an external electrical condition, prior repair work, or misuse.
The engineer can evaluate those hypotheses using physical evidence, operating data, electrical calculations, testing, and known system behavior. When technically plausible alternatives could materially affect the opinion, a well-supported analysis should address them rather than assume that the alleged defect caused the event.
An electrical engineering expert may begin by identifying the evidence needed to understand the product's condition and operation.
Depending on the technology and allegations, the expert may review:
The expert may also perform electrical measurements, component examinations, insulation or continuity testing, functional tests, thermal analysis, or controlled exemplar testing when appropriate.
Before potentially destructive examination, counsel and the expert should consider applicable preservation obligations, inspection protocols, and court orders. If disassembly proceeds, documenting the product and retaining removed components may help preserve the evidentiary record.
A strong engineering opinion should clearly show how the evidence supports the conclusion. The precise method depends on the product and alleged failure.
The expert may document the evidence, review the product's design and operating environment, and develop plausible failure explanations involving component failure, manufacturing variation, circuit behavior, external power conditions, installation, misuse, environmental exposure, or maintenance. Those possibilities may be evaluated through measurements, calculations, testing, exemplar comparison, design review, and relevant technical literature or standards.
The analysis should also identify important limitations, such as missing components, post-incident damage, incomplete data, undocumented repairs, or testing constraints.
Codes and standards can provide useful technical benchmarks, but the applicable document depends on the product, system, date, and jurisdiction.
The National Electrical Code, NFPA 70, primarily addresses electrical installations. Although NFPA publishes the 2026 edition, counsel should confirm which edition and amendments apply in the relevant jurisdiction. The NEC may be relevant to wiring, grounding, installation, or a product's interface with the electrical system, but it should not automatically be treated as the governing product-design or legal standard for a particular claim.
Product-specific UL, IEC, IEEE, or other standards may address the equipment itself. Their applicability and legal significance depend on the product, circumstances, jurisdiction, and governing law.
The expert's analysis should identify:
An expert may address technical compliance or noncompliance, while counsel should assess what legal significance, if any, governing law assigns to that evidence.
In federal proceedings governed by the Federal Rules of Evidence, Rule 702 provides the principal standard for admitting electrical engineering expert testimony. The most recent amendments to Rule 702 took effect on December 1, 2023, and the rule appears in the Federal Rules of Evidence as amended through December 1, 2025.
Rule 702 also requires the witness to be qualified as an expert by knowledge, skill, experience, training, or education.
The proponent must demonstrate to the court that it is more likely than not that:
In Daubert v. Merrell Dow Pharmaceuticals, Inc., the Supreme Court addressed the federal court's gatekeeping responsibility for scientific expert testimony. In Kumho Tire Co. v. Carmichael, the Court confirmed that the same responsibility extends to technical and other specialized testimony, including engineering.
For an electrical engineer, admissibility depends on more than credentials. The expert should be able to explain the evidence reviewed, the methods used, how the conclusions follow from the evidence, and, when material, how competing explanations were evaluated.
State evidentiary standards vary, so counsel should confirm the rules governing expert testimony in the applicable jurisdiction.
Early discussions with an expert should clarify the technical scope and limits of the proposed investigation.
Useful questions include:
These questions can help counsel focus discovery on evidence that may affect the engineering analysis.
When should an electrical engineering expert be retained in a product liability case?
An electrical engineering expert should be considered early when an alleged failure involves circuits, wiring, power supplies, batteries, electronic controls, electrical fires, shock, or other technical electrical mechanisms.
What products may involve electrical engineering failure analysis?
Electrical engineering analysis may be useful for appliances, consumer electronics, power tools, industrial equipment, electric vehicles, chargers, medical equipment, and smart-home devices. The appropriate specialty depends on the technology and alleged failure.
How can an electrical engineering expert evaluate an alleged product defect?
The expert can compare physical evidence with the product's design, specifications, manufacturing records, operating data, testing, and applicable technical standards. Whether those findings satisfy the jurisdiction's legal definition of a defect is a separate legal question.
Can an electrical engineering expert determine what caused a product fire?
An electrical engineer may evaluate electrical ignition mechanisms and whether particular electrical conditions are supported by the evidence. Broader fire-origin-and-cause analysis or complex battery incidents may require additional expertise.
What qualifications matter when selecting an electrical engineering expert witness?
Counsel should consider relevant education, engineering experience, familiarity with the technology and failure mechanism, and experience with applicable testing and standards. Professional Engineer licensure may also be relevant depending on the assignment and jurisdiction.
Causation Analysis
Electrical Fires
Fire Cause and Origin Investigations
Forensic Analysis
Laboratory Testing
Preservation
Evidence Analysis
Expert Witness Insights by Area of Expertise
Expert Witness Insights by Area of Expertise
