Dangers of Electricity



Click Here for E-Book Details



Click Here for E-Book Details

Dangers of Electricity include a variety of hazards that include Electric Shock, Psychological Damage, Physical Burns, Neurological Damage and Ventricular fibrillation resulting in death.

Any form of energy, when not properly controlled or harnessed, can result in serious danger to those who use it. The risks inherent with electric power can generally be divided into two categories: direct and indirect. The direct danger is the damage that the power itself can do to the human body, such as stoppage of breathing or regular heartbeats, or burns. The indirect dangers of electricity include the damages that can result to the human body as a result of something caused by electric shock, such as a fall, an explosion, or a fire.

Electricity at any voltage can be dangerous and should always be approached with caution. An electric shock can occur upon contact of a human or animal body with any source of voltage high enough to cause sufficient current flow through the muscles or nerves. The minimum current a human can feel is thought to be about 1 milliampere (mA). As little as 80 milliampere, can seize the heart muscle. The current may cause tissue damage or heart fibrillation if it is sufficiently high. A fatal electric shock is referred to as electrocution.

Psychological

The perception of electric shock can be different depending on the voltage, duration, current, path taken, frequency, etc. Current entering the hand has a threshold of perception of about 5 to 10 mA (milliampere) for DC and about 1 to 10 mA for AC at 60 Hz. Shock perception declines with increasing frequency, ultimately disappearing at frequencies above 15-20 kHz.

Burns

Dangers of Electricity include physical burns. High-voltage (> 500 to 1000 V) shocks tend to cause internal burns due to the large energy (which is proportional to the duration multiplied by the square of the voltage) available from the source. Damage due to current is through tissue heating. In some cases 16 volts might be fatal to a human being when the electricity passes through organs such as the heart.

Ventricular fibrillation

A low-voltage (110 to 220 V), 50 or 60-Hz AC current travelling through the chest for a fraction of a second may induce ventricular fibrillation at currents as low as 60mA. With DC, 300 to 500 mA is required. If the current has a direct pathway to the heart (e.g., via a cardiac catheter or other kind of electrode), a much lower current of less than 1 mA, (AC or DC) can cause fibrillation. Fibrillations are usually lethal because all the heart muscle cells move independently. Above 200mA, muscle contractions are so strong that the heart muscles cannot move at all.

Neurological effects

Other Dangers of Electricity cause interference with nervous control, especially over the heart and lungs. Repeated or severe electric shock which does not lead to death has been shown to cause neuropathy.

When the current path is through the head, it appears that, with sufficient current, loss of consciousness almost always occurs swiftly.

Arc Flash

Arc flash and arc blast will always be present on the job, but proper awareness, training and the development of arc flash safety personal protection strategies can minimize the likelihood of injury and fatality.

The leading standard governing the calculation and determination of explosive hazard is the NFPA 70E - Electrical Safety in the Workplace. This electrical safety standard covers the full range of electrical safety issues from work practices to maintenance, special equipment requirements, and installation. In fact, OSHA in the United States already bases its electrical safety mandates on the comprehensive information in this important Standard.

Electrical safety is the leading subject in the North American power industry. Electrical accidents, when they occur (and they occur every day) are extremely debilitating and often fatal, depending on the voltage and amperage involved, as well as the conditions of electrocution. As little as 80 ,illiamps of electricity is enough energy to put the human heart into defibrillation and death. So, this subject should be addressed with commitment from electrical workers and their management.


Dangers of Electricity


Subscription

 
Training Courses

Electrical Generators & Backup Emergency Power Systems

  • September 24-25, 2014 - Mississauga, ON
  • October 1-2, 2014 - Edmonton, AB

Fire Alarm and Life Safety Systems

  • October 6-7, 2014 - Mississauga, ON
  • October 8-9, 2014 - Calgary, AB
  • October 14-15, 2014 - Richmond, BC
  • October 16-17, 2014 - Winnipeg, MB

Ontario Electrical Safety Code Training

  • October 9-10, 2014 - Mississauga, ON

Power System Design Engineering Course

  • October 14-15, 2014 - Mississauga, ON
  • October 16-17, 2014 - Edmonton, AB
  • October 20-21, 2014 - Richmond, BC

LV-MV Electrical Grounding for Industrial Power Systems

  • October 16-17, 2014 - Richmond, BC
  • October 20-21, 2014 - Edmonton, AB
  • October 27-28, 2014 - Mississauga, ON
  • November 3-4, 2014 - St. Johns, NL
  • November 17-18, 2014 - Saskatoon, SK
  • November 19-20, 2014 - Winnipeg, MB

Edmonton Electrical Grounding Week

  • October 20-24, 2014 - Edmonton, AB

High Voltage Electrical Grounding

  • October 22, 2014 - Edmonton, AB
  • October 29, 2014 - Mississauga, ON
  • November 5, 2014 - St. Johns, NL

Electrical Grounding For Oil & Gas Applications

  • October 23-24, 2014 - Edmonton, AB
  • November 6-7, 2014 - St. Johns, NL

Toronto Electrical Grounding Week

  • October 27-31, 2014 - Mississauga, ON

Edmonton Electric Motor Week

  • October 27-31, 2014 - Edmonton, AB

Industrial Electric Motor Management

  • October 27-28, 2014 - Edmonton, AB
  • November 17-18, 2014 - Mississauga, ON

VFD and Electric Motor Control Training

  • October 29-30, 2014 - Edmonton, AB
  • November 19-20, 2014 - Mississauga, ON

Telecommunications Electrical Grounding and Bonding

  • October 30-31, 2014 - Mississauga, ON

Industrial Electric Motor Testing

  • October 31, 2014 - Edmonton, AB
  • November 21, 2014 - Mississauga, ON

St. Johns Electrical Grounding Week

  • November 3-7, 2014 - St. Johns, NL

2014 Electrical Transformer Forums

  • November 3-4, 2014 - Edmonton, AB
  • November 5-6, 2014 - Mississauga, ON

Power System Protection Engineering Course

  • November 13-14, 2014 - Mississauga, ON
  • November 17-18, 2014 - Richmond, BC
  • November 19-20, 2014 - Edmonton, AB

Toronto Electric Motor Week

  • November 17-21, 2014 - Mississauga, ON

Power System Modeling and Calculations Engineering Course

  • December 4-5, 2014 - Mississauga, ON
  • December 8-9, 2014 - Richmond, BC
  • December 10-11, 2014 - Edmonton, AB
 
Affiliates
 
Featured Product

Large Stocking Distributor Specializing in Instrument Transformers and Metering Components

Spectrum Industries, Inc.
Spectrum Industries is an Instrument Transformer electrical distributor and contract manufacturer located in Peabody, Massachusetts.
more...
 
Advertisement
 
Latest Buyer's Guide Companies
Sign Up Today and Receive Our FREE E- Newsletter

E-newsletter service - Exciting industry trends, technical developments, product information, forums and electrical training courses.