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Related Concept Videos

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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Pharmaceutical poisoning can occur through various channels, impacting an estimated 2 million hospitalized patients in the U.S. annually with serious adverse drug responses. These scenarios encompass both therapeutic uses, such as drug toxicity, where even standard dosages can lead to severe central nervous system depression, and non-therapeutic exposures, including accidental ingestion by children, and environmental and occupational exposures.Unintentional poisonings often involve exploratory...
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Insulation Coordination01:23

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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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Zones of Protection01:16

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In power systems, the entire setup is divided into protective zones to isolate faults and protect the rest of the network. These zones include generators, transformers, buses, transmission lines, distribution lines, and motors. Each zone can be visualized as a separate room in a house, with each room protected by its own circuit breaker.
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Overcurrent Relays01:26

Overcurrent Relays

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Overcurrent relays, crucial for circuit protection, are connected to the secondary current of a current transformer. There are two primary types of overcurrent relays: instantaneous and time-delay.
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Coordinating time-delay overcurrent relays in complex radial systems and directional overcurrent relays in multi-source transmission loops can be challenging. Impedance relays address these issues by responding to the voltage-to-current ratio, specifically measuring the apparent impedance of a line. These relays become more sensitive during faults as current increases and voltage decreases, thereby reducing the apparent impedance.
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Related Experiment Video

Updated: Mar 9, 2026

A Rapidly Incremented Tethered-Swimming Maximal Protocol for Cardiorespiratory Assessment of Swimmers
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Swimming Pool Electrical Injuries: Steps Toward Prevention.

Jun Tashiro, Cathy A Burnweit1

  • 1Department of Pediatric Surgery, Nicklaus Children's Hospital, Miami, FL.

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Summary

Electrical injuries in swimming pools are a significant pediatric concern. Most cases involve common electrical sources and occur at home, highlighting a need for improved safety measures and public awareness.

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Area of Science:

  • Public Health
  • Pediatric Traumatology
  • Electrical Safety

Background:

  • Electrical injuries in swimming pools pose a serious public health risk to children.
  • Understanding the clinical presentation and epidemiology is crucial for prevention.

Purpose of the Study:

  • To enhance the understanding of clinical outcomes for pediatric swimming pool electrical injuries.
  • To describe the epidemiology of these injuries in the United States.

Main Methods:

  • Reviewed 4 pediatric cases from a single trauma center.
  • Queried the National Electronic Injury Surveillance System (NEISS) for swimming pool electrical injuries (1991-2013).

Main Results:

  • 566 cases reported; mean age 9.2 years.
  • Most injuries occurred at home (57.0%) involving electrical outlets (39.8%).
  • Pediatric cases comprised 48.4% of NEISS reports.

Conclusions:

  • Swimming pool electrical injuries cause significant morbidity and mortality.
  • Current prevention efforts are inadequate; enhanced safety measures are needed.
  • Mandatory use of ground fault circuit interrupters and increased public education are recommended.