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Related Concept Videos

Investigation of Disease Outbreaks01:23

Investigation of Disease Outbreaks

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Multistate foodborne outbreaks pose significant public health risks and require meticulous investigation to identify sources and implement control measures. The Centers for Disease Control and Prevention (CDC) utilizes a dynamic seven-step process for these investigations, integrating data from laboratories, interviews, and environmental assessments to protect public health.Outbreak Detection: The detection of multistate outbreaks typically begins with PulseNet, the CDC's national laboratory...
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Three-Phase Short Circuit—Unloaded Synchronous Machine01:21

Three-Phase Short Circuit—Unloaded Synchronous Machine

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Conducting a three-phase short circuit test on an unloaded synchronous machine helps understand its impact on the system. The AC fault current's oscillogram, with the DC offset removed, reveals that the waveform amplitude decreases from an initially high value to a steady-state level for one phase of the machine.
This behavior occurs due to the magnetic flux produced by the short-circuit armature currents. Initially, these currents follow high-reluctance paths but eventually shift to...
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Power System Three-Phase Short Circuits01:21

Power System Three-Phase Short Circuits

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Determining the subtransient fault current in a power system involves representing transformers by their leakage reactances, transmission lines by their equivalent series reactances, and synchronous machines as constant voltage sources behind their subtransient reactances. In this analysis, certain elements are excluded, such as winding resistances, series resistances, shunt admittances, delta-Y phase shifts, armature resistance, saturation, saliency, non-rotating impedance loads, and small...
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Insulation Coordination01:23

Insulation Coordination

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Insulation coordination is the process of matching electric equipment's insulation strength with protective device characteristics to protect the equipment against expected overvoltages. This selection is based on engineering judgment and cost. Equipment can generally withstand short-duration high transient overvoltages, but repeated tests with identical waveforms can yield inconsistent results. As a result, standard impulse voltage waveforms are used for testing, defined by specific times...
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Steps in Outbreak Investigation01:18

Steps in Outbreak Investigation

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In the ever-evolving field of public health, statistical analysis serves as a cornerstone for understanding and managing disease outbreaks. By leveraging various statistical tools, health professionals can predict potential outbreaks, analyze ongoing situations, and devise effective responses to mitigate impact. For that to happen, there are a few possible stages of the analysis:
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Household Wiring And Electrical Safety01:13

Household Wiring And Electrical Safety

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Companies that supply power to most modern households use three conductors, typically called a three-wire line. While one is neutral, the other two are both at 120 V but with opposite polarity, giving a voltage of 240 V between them. With a three-wire line, high-power appliances that require 240 V, such as electric stoves and clothes dryers, are linked between the two hot lines. 120 V appliances can be connected between the neutral and either of the hot lines. The neutral side, which is always...
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Related Experiment Video

Updated: Apr 24, 2026

In Situ Gas Analysis and Fire Characterization of Lithium-Ion Cells During Thermal Runaway Using an Environmental Chamber
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Lockout/tagout accident investigation.

James R White

    Occupational Health & Safety (Waco, Tex.)
    |September 6, 2014
    PubMed
    Summary

    Assumptions in the workplace can lead to severe injuries, even without fatalities. Adhering to fundamental safety rules, such as test-before-touch, is crucial for preventing accidents and ensuring worker well-being.

    Area of Science:

    • Occupational Safety and Health
    • Electrical Safety
    • Risk Management

    Background:

    • Workplace incidents often stem from assumptions made by both employees and employers.
    • Complex work environments with multiple contractors and power systems increase the risk of errors.
    • Human fallibility is a significant factor in workplace accidents, necessitating robust safety protocols.

    Purpose of the Study:

    • To highlight the dangers of assumptions in electrical maintenance safety.
    • To emphasize the importance of adhering to fundamental safety procedures.
    • To underscore the role of regulations and policies in preventing workplace injuries.

    Main Methods:

    • Case study analysis of a workplace incident.
    • Review of safety regulations and standards (e.g., OSHA, NFPA 70E).

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  • Discussion of human factors in safety compliance.

    • Main Results:

    • An employee suffered significant pain and suffering due to a failure to follow safety rules.
    • Assumptions by workers and companies contributed to the incident.
    • The incident could have been prevented by following the 'test-before-touch' rule.

    Conclusions:

    • Strict adherence to fundamental safety rules like 'test-before-touch' is paramount.
    • A proactive approach to safety, involving planning and execution, is essential.
    • Continuous reinforcement of safety procedures and awareness of human fallibility are critical for preventing workplace accidents.