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Protection From Electrical Shock and Arc Flash

The new NEC Standard, Article 110.16 Flash Protection states that, "Switchboards, Powerboards, Control Panels and Motor Control Centers shall be field marked to warn of potential arc flash hazards."

Bureau of Labor Statistics data for 1994 shows over that 11,000 days away from work resulted from electrical burns, fires, explosions, and electrocution/electrical shock. Out of 6,588 work related fatalities, 548 resulted from electrical related causes.

An arc flash occurs when a conductive object gets too close to a current source, or by equipment failure. Accidents such as dropped tools, a buildup of conductive dust and dirt, corrosion, and accidental contact with electrical systems are the most common causes of arc flash injuries. Prevention involves setting up flash protection boundaries within which Personal Protective Equipment must be used. Another important component is proper labeling which warns of arc flash and other electrical hazards.

Arc flash labels are available as either pre-printed labels, such as the arc flash labels shown here, or a label printer can be used to create both standard and customized warning labels.
Making Arc Flash danger signs



An arc flash can result in temperatures up to 35,000 degrees F.
This is four times hotter than the surface of the sun and can result in fatal burns up to five feet from the arc, and severe burns at distances up to ten feet away. In addition, an arc-blast may occur. An arc-blast results from the rapid heating of air and the vaporization of metal. This creates a pressure wave than can damage hearing and cause a concussion resulting in memory loss. An arc-blast can also result in flying metal, some of which may be molten.

Prevention of arc flash hazards involves several steps:
  • Identify equipment and components that have a potential arc flash hazard.

  • Use Lock Out / Tag Out proceedures to ensure equipment is de-energized, or live components are isolated.

  • Ensure all potential arc flash hazards are properly labeled. Standard arc flash labels can be used. Or use a label printer to create custom labels that include specific information such as safe distances and required Personal Protective Equipment.
Labels which clearly identify equipment and components are important for elimiating confusion. In some instances it may also be appropriate to provide labels with maintenance or cleaning proceedures.

To ensure you have a safe workplace, and that you are meeting NEC, OSHA, IEEE and NFPA requirements, use specialized arc flash software to calculate protection boundries. These boundaries include the Flash Protection Boundry, Limited Approach Boundary, Restricted Approach Boundary and the Prohibited Approach Boundary.
  • Provide employee training. Be sure all employees are trained so they are aware of the dangers resulting from arc flashes; they understand the warning labels and signs; and they know how to use the appropriate PPE. Everyone working on electrical equipment should be fully trained and qualified for the job.
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Use the DuraLabel to make arc flash labels

 

 

Arc Flash Information Guide

 

 

Print Arc Flash labels with the Brady PowerMark

 

 

Extremely versatile desktop label and sign printer

 

 

Arc Flash Hazard Solutions Handbook



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